drm/i915: Use DIV_ROUND_CLOSEST for PWM calculations

Supposedly we would want to get the PWM output as close as possible to
the target, so let's round to closest.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Suggested-by: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-7-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

drm/i915: Clean up .get_aux_clock_divider() functions

Now that the mess with AUX clock divder rounding is sorted out and
we have both cdclk and rawclk cached in dev_priv, we can clean up
the .get_aux_clock_divider() functions a bit.

The main thing here is just calling ilk_get_aux_clock_divider()
from hsw_get_aux_clock_divider() except for the LPT:H special
case.

We could go further and call g4x_get_aux_clock_divider() from
ilk_get_aux_clock_divider() for the PCH ports, but I'm sure Jani
would object, so leave that be.

While at it repeat the comment where the AUX clock comes from
in ilk_get_aux_clock_divider().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-6-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Read out hrawclk from CCK on vlv/chv

Currently we assume that hrawclk is 200MHz on VLV/CHV. That should
be true always, but just to avoid such asumptions we can read out the
actual frequency from CCK.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Use g4x_get_aux_clock_divider() for VLV/CHV

With the hrawclk frequency cached in dev_priv, we can simply use
g4x_get_aux_clock_divider() for VLV/CHV.

v2: Rebase due to IS_VALLYVIEW vs. IS_CHERRYVIEW split

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-4-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Rename s/i9xx/g4x/ in DP code

g4x is the first platform with DP support, so let's name the relevant
functions as g4x_ instead i9xx_ to avoid confusion.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-3-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Store rawclk_freq in dev_priv

Generalize rawclk handling by storing it in dev_priv.

Presumably our hrawclk readout works at least for CTG and ELK
since we've been using it for DP AUX on those platforms. There
are no real docs anymore after configdb vanished, so the only
reference is the public CTG GMCH spec. What bits are listed in
that doc match our code. The ELK GMCH spec have no relevant
details unfortunately.

The PNV situation is less clear. Starting from
commit aa17cdb4f836 ("drm/i915: initialize backlight max from VBT")
we assume that the CTG/ELK hrawclk readout works for PNV as well.
At least the results *seem* reasonable for one PNV machine (Lenovo
Ideapad S10-3t). Sadly the PNV GMCH spec doesn't have the goods on
the relevant register either.

So let's keep assuming it works for PNV,ELK,CTG and read it out on
those platforms. G33 also has hrawclk according to some notes
in BSpec, but we don't actually need it for anything, so let's not
even try to read it out there.

v2: Rebase due to IS_VALLYVIEW vs. IS_CHERRYVIEW split
    Use KHz() all over, and kill off a few useless temp variables

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

drm/i915: Do not wait atomically for display clocks

Looks like this code does not need to wait atomically since it
otherwise takes the mutex.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1457015805-23742-1-git-send-email-tvrtko.ursulin@linux.intel.com

drm/i915: Do not lie about atomic timeout granularity

Currently the wait_for_atomic_us only allows for a jiffie
timeout granularity which is not nice towards callers
requesting small micro-second timeouts.

Re-implement it so micro-second timeout granularity is really
supported and not just in the name of the macro.

This has another beneficial side effect that it improves
"gem_latency -n 100" results by approximately 2.5% (throughput
and latencies) and 3% (CPU usage). (Note this improvement is
relative to not yet merged execlist lock uncontention patch
which moves the CSB MMIO outside this lock.)

It also shrinks some hot functions like fw_domains_get by a
tiny 3%.

v2:
  * Warn when used from non-atomic context (if possible).
  * Warn on too long atomic waits.

v3:
  * Added comment explaining CONFIG_PREEMPT_COUNT.
  * Fixed pre-processor indentation.
  (Chris Wilson)

v4:
 * Commit msg update (gem_latency) and rebase.

v5:
 * Commit message re-wording.
 * Added comment about no need for double cond check. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Kconfig for extra driver debugging

v2: Added a submenu based on an idea by Chris Wilson.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915/lrc: Do not wait atomically when stopping engines

I do not see that this needs to be done atomically and up to
one second is quite a long time to busy loop.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915: Add wait_for_us

This is for callers who want micro-second precision but are not
waiting from the atomic context.

v2:
  * Fix atomic waits. (Dave Gordon)
  * Use USEC_PER_SEC and USEC_PER_MSEC. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drm/i915/bxt: Additional MIPI clock divider form B0 stepping onwards

The MIPI clock calculations for the addtional clock
are revised from B0 stepping onwards, the bit definitions
have changed compared to old stepping.

v2: Fixing compilation warning.
v3: Retained the old Macros (Jani)

Signed-off-by: Deepak M <m.deepak@intel.com>
Tested-by: Ramalingam C <ramalingam.c@intel.com> # BXT-T with Tianma panel
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455556437-29267-1-git-send-email-m.deepak@intel.com

drm/i915: Only recalculate wm's for planes part of the state, v2.

Only planes that are part of the state should be used for recalculating
watermarks. For planes not part of the state the previous patch allows
us to re-use the old values since they're calculated even for levels
that are not actively used.

Changes since v1:
- Remove big if from intel_crtc_atomic_check.
- Remove extra newline.
- Remove memset in ilk_compute_pipe_wm.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456826842-32553-2-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Allow preservation of watermarks, v2.

As Paulo has noted we can help bisectability by separating computing
watermarks on a noop in 2 separate commits.

This patch no longer clears the crtc watermark state, but recalculates
it completely. Regardless whether a level is used the full values for
each level are calculated. If a level is invalid wm[level].enable is
unset.

Changes since v1:
- Only call ilk_validate_wm_level when level <= usable_level. (Ville)

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56D6D09E.5040007@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Handle invalid ilk pipe watermarks correctly.

This function returns an int, but when ilk_validate_pipe_wm fails it
returns false, which is 0 (success). As a result invalid watermarks
are applied, while they should have been rejected.

Fix this by returning -EINVAL.

Fixes: ed4a6a7ca853 ("drm/i915: Add two-stage ILK-style watermark programming (v11)")
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456918563-28696-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

drm/i915: Hold RPM reference while setting freq limits through sysfs

This changes ensures device is active when frequency limits are changed.
This is needed as we are writing to register RPNSWREQ in intel_set_rps.
If not done, might lead to undesired errors like:
[ 1965.189137] [drm:fw_domains_get] *ERROR* blitter: timed out waiting for forcewake ack to clear.

v2: Added elaborate commit message. (Jani)
    Fixing RPM reference drop in early exit paths. (Ville)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1454951831-11778-1-git-send-email-sagar.a.kamble@intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm/i915: Avoid snooping with userptr where not supported

   commit e5756c10d841ddb448293c849392f3d6b809561f
   Author: Imre Deak <imre.deak@intel.com>
   Date:   Fri Aug 14 18:43:30 2015 +0300

       drm/i915/bxt: don't allow cached GEM mappings on A stepping

Added an exception of disallowing snooping for Broxton A
stepping hardware but userptr was still enabling it regardless.

Move the check to HAS_SNOOP now that it is used from multiple
call sites and use it.

v2: Userptr cannot be supported when it cannot be coherent and
    generalize the code better. (Chris Wilson)

v3: Make has_snoop true only when !has_llc. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1456920631-34302-1-git-send-email-tvrtko.ursulin@linux.intel.com

drm/i915: Do not return unknown status when load detection is tested.

This fixes the IGT test, which interprets unknown status as failed to
acquire load detect pipe.

Cc: Gabriel Feceoru <gabriel.feceoru@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456848241-6431-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm/i915/gen9: Remove state asserts when disabling DC states

Disabling the DC states when it's already disabled is a valid scenario,
for example during HW state sanitization during driver loading and
resuming or when DC states are disabled via the i915.enable_dc or
disable_power_well option.

CC: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456778945-5411-4-git-send-email-imre.deak@intel.com

drm/i915/gen9: Disable DC states if power well support is disabled

If power well support is disabled via the i915.disable_power_well module
option we should never enable DC states. Currently we would enable DC
states even in this case during system suspend, where we need to disable
all power wells regardless of the disable_power_well option.

CC: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456778945-5411-3-git-send-email-imre.deak@intel.com

drm/i915/gen9: Sanitize handling of allowed DC states

We can simplify the conditions selecting the target DC state during
runtime by calculating the allowed DC states in advance during driver
loading. This also makes it easier to disable DC states depending on the
i915.disable_power_well module option, added in the next patch.

v2:
- Print a debug message if the requested max DC value was adjusted due
  to a platform limit. Also debug print the calculated mask value. (Patrik)

CC: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456778945-5411-2-git-send-email-imre.deak@intel.com

drm/i915/skl: Fix power domain suspend sequence

During system suspend we need to first disable power wells then
unitialize the display core. In case power well support is disabled we
did this in the wrong order, so fix this up.

Fixes: d314cd43 ("drm/i915: fix handling of the disable_power_well module option")
CC: stable@vger.kernel.org
CC: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456778945-5411-1-git-send-email-imre.deak@intel.com

drm/i915/error: Capture WA ctx batch in error state

execute during context save/restore, good to have them in error state.

v2: use wa_ctx->size and print only size values (Mika)
v3: simplify conditions when recording and freeing object (Chris)
v4: resolve checkpatch errors (Tvrtko)

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456831476-10782-1-git-send-email-arun.siluvery@linux.intel.com

drm/i915: Try to fix CRT port clock limits

LPT/WPT-H are limited to max 180 MHz CRT dotclock. Most other platforms
have a limit of 350 MHz. Supposedly gen3 and gen4 go up to 400 MHz.

VLV is a bit special since the docs are poor. Supposedly the DAC
would be good up to 355 MHz, but currently we limit the DPLL to
270 MHz, so we'll have to limit the port clock to the same unless
we change the DPLL limits.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-7-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Read out VGA dotclock properly on LPT

Rather than assume the VGA dotclock is really the FDI based thing,
let's read out the real thing via iclkip, and after readout it'll
get to compare it with the FDI based number to make sure they're
in sync.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-6-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Make the LPT iclkip 20MHz case more generic

The reason for spcial casing 20MHz in the iclkip calculations is that
it would overflow the 7 bit divisor value. Let's rewrite the special
case to check for just that, and bump up auxdiv when needed. This makes
the code work for freqeuencies close to but not exactly 20MHz. The real
lower limit for auxdiv=0 is actually:
172800000/(0x7f+2)*64)=~20930 kHz, and below that we must resort to
auxdiv=1.

Actually this is all very theoretical since we limit the dotclock to
min 25MHz with CRT on all platforms. 25Mhz is actually the documented
limit in Bspec, so it seems we ought to never need to worry about the
auxdiv=1 case. But no harm in having it.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Remove the SPLL==270Mhz assumption from intel_fdi_link_freq()

Instead of assuming we've correctly set up SPLL to run at 270Mhz for
FDI, let's use the port_clock from pipe_config which should be what
we want. This would catch problems if someone misconfigures SPLL for
whatever reason.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Move the encoder vs. FDI dotclock check out from encoder .get_config()

Currently we check if the encoder's idea of dotclock agrees with what
we calculated based on the FDI parameters. We do this in the encoder
.get_config() hooks, which isn't so nice in case the BIOS (or some other
outside party) made a mess of the state and we're just trying to take
over.

So as a prep step to being able sanitize such a bogus state, move the
the sanity check to just after we've read out the entire state. If
we then need to sanitize a bad state, it should be easier to move the
sanity check to occur after sanitation instead of before it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Dump ddi_pll_sel in hex instead of decimal on HSW/BDW

On HSW/BDW ddi_pll_sel is the actual register value. Let's dump
it in hex so that people migth actually understand what it says.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Embed rotation_info under intel_framebuffer

Instead of repopulatin the rotation_info struct for the fb every time
we try to use the fb, we can just populate it once when creating the fb,
and later we can just copy the pre-populate struct into the gtt_view.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-10-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Move the NULL sg handling out from rotate_pages()

rotate_pages() checks to see if it got called with a NULL sg, and then
goes to extract it from sg->sgl. It always gets called with a NULL sg
for the first plane, so moving the initial 'sg=st->sgl' assignment out
into intel_rotate_fb_obj_pages() seems less special-casey.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-9-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Reorganize intel_rotation_info

Throw out a bunch of unnecessary stuff from struct intel_rotation_info,
and pull most of the remaining stuff to live under an array of
per-color plane sub-structures.

What still remains outside the sub-structure will be reorgranized later
as well, but that requires more work elsewhere so leave it be for now.

v2: Split the vma size == luma+chroma size fix to prep patch (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v1)
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-8-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Pass drm_frambuffer to intel_compute_page_offset()

intel_compute_page_offsets() gets passed a bunch of the framebuffer
metadate sepearately. Just pass the framebuffer itself to make life
simpler for the caller, and make it less likely they would make a
mistake in the order of the arguments (as most as just unsigned ints and
such).

We still pass the pitch explicitly since for 90/270 degree rotation
the caller has to pass in the right thing.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-7-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Don't pass plane+plane_state to intel_pin_and_fence_fb_obj()

intel_pin_and_fence_fb_obj() only needs the framebuffer, and the desird
rotation (to find the right GTT view for it), so no need to pass all
kinds of plane stuff.

The main motivation is to get rid of the uggy NULL plane_state handling
due to fbdev.

v2: Add a note why I really want this

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Grumpily-Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-6-git-send-email-ville.syrjala@linux.intel.com

drm/i915: Support for extra alignment for tiled surfaces

SKL+ needs >4K alignment for tiled surfaces, so make
intel_compute_page_offset() handle it.

The way we do it is first we compute the closest tile boundary
as before, and then figure out how many tiles we need to go
to reach the desired alignment. The difference in the offset
is then added into the x/y offsets.

v2: Be less confusing wrt. units (pixels vs. bytes) (Daniel)
v3: Use u32 for offsets
    Have intel_adjust_tile_offset() return the new offset (will be
    useful later)
    Add an offset_aligned variable (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Pass 90/270 vs. 0/180 rotation info for intel_gen4_compute_page_offset()

The page aligned surface address calculation needs to know which way
things are rotated. The contract now says that the caller must pass the
rotate x/y coordinates, as well as the tile_height aligned stride in
the tile_height direction. This will make it fairly simple to deal with
90/270 degree rotation on SKL+ where we have to deal with the rotated
view into the GTT.

v2: Pass rotation instead of bool even thoughwe only care about 0/180 vs. 90/270
v3: Introduce intel_tile_dims(), and don't mix up different units so much
v4: Unconfuse bytes vs. pixels even more

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: s/tile_width/tile_width_bytes/

Make if clear whether we're talking tile widths in bytes or in pixels.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Account for the size of the chroma plane for the rotated gtt view

The size of the rotated ggtt mapping ought to include the size of the
chroma plane as well. Not a huge deal since we don't expose NV12 (or any
pother planar format for that matter) yet.

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Fixes: 89e3e1427629 ("drm/i915: Support NV12 in rotated GGTT mapping")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drm/i915: Add missing NULL check before calling initial_watermarks

Not all platforms set this callback, so NULL check it before calling it.

v2:
- Call intel_update_watermarks() on HSW+ where the callback is not set.
  (Matt)

CC: Matt Roper <matthew.d.roper@intel.com>
Fixes: commit ed4a6a7ca853 ("drm/i915: Add two-stage ILK-style watermark programming (v11)")
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456776633-3401-1-git-send-email-imre.deak@intel.com
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

drm/i915: Execlists small cleanups and micro-optimisations

Assorted changes in the areas of code cleanup, reduction of
invariant conditional in the interrupt handler and lock
contention and MMIO access optimisation.

 * Remove needless initialization.
 * Improve cache locality by reorganizing code and/or using
   branch hints to keep unexpected or error conditions out
   of line.
 * Favor busy submit path vs. empty queue.
 * Less branching in hot-paths.

v2:

 * Avoid mmio reads when possible. (Chris Wilson)
 * Use natural integer size for csb indices.
 * Remove useless return value from execlists_update_context.
 * Extract 32-bit ppgtt PDPs update so it is out of line and
   shared with two callers.
 * Grab forcewake across all mmio operations to ease the
   load on uncore lock and use chepear mmio ops.

v3:

 * Removed some more pointless u8 data types.
 * Removed unused return from execlists_context_queue.
 * Commit message updates.

v4:
 * Unclumsify the unqueue if statement. (Chris Wilson)
 * Hide forcewake from the queuing function. (Chris Wilson)

Version 3 now makes the irq handling code path ~20% smaller on
48-bit PPGTT hardware, and a little bit less elsewhere. Hot
paths are mostly in-line now and hammering on the uncore
spinlock is greatly reduced together with mmio traffic to an
extent.

Benchmarking with "gem_latency -n 100" (keep submitting
batches with 100 nop instruction) shows approximately 4% higher
throughput, 2% less CPU time and 22% smaller latencies. This was
on a big-core while small-cores could benefit even more.

Most likely reason for the improvements are the MMIO
optimization and uncore lock traffic reduction.

One odd result is with "gem_latency -n 0" (dispatching empty
batches) which shows 5% more throughput, 8% less CPU time,
25% better producer and consumer latencies, but 15% higher
dispatch latency which is yet unexplained.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1456505912-22286-1-git-send-email-tvrtko.ursulin@linux.intel.com

drm/i915: Handle -EDEADLK in drm_atomic_commit from load-detect.

CI runs with DEBUG_WW_MUTEX_SLOWPATH, so -EDEADLK occurs a lot more.
Handle the case where drm_atomic_commit fails with -EDEADLK correctly.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56D3FEF1.6070306@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm/i915: remove dead code

79e539453b34e35f39299a899d263b0a1f1670bd ("DRM: i915: add mode setting
support") added those variables but never used them.

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1456763047-28828-2-git-send-email-eric.engestrom@imgtec.com

drm/i915: remove left over dead code

ae80152ddad252f33893b92dd69f00cc53c5949f ("drm/i915: Rewrite VLV/CHV
watermark code") removed everything that would have used those vars.

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1456763047-28828-1-git-send-email-eric.engestrom@imgtec.com

drm/i915: Add two-stage ILK-style watermark programming (v11)

In addition to calculating final watermarks, let's also pre-calculate a
set of intermediate watermark values at atomic check time.  These
intermediate watermarks are a combination of the watermarks for the old
state and the new state; they should satisfy the requirements of both
states which means they can be programmed immediately when we commit the
atomic state (without waiting for a vblank).  Once the vblank does
happen, we can then re-program watermarks to the more optimal final
value.

v2: Significant rebasing/rewriting.

v3:
 - Move 'need_postvbl_update' flag to CRTC state (Daniel)
 - Don't forget to check intermediate watermark values for validity
   (Maarten)
 - Don't due async watermark optimization; just do it at the end of the
   atomic transaction, after waiting for vblanks.  We do want it to be
   async eventually, but adding that now will cause more trouble for
   Maarten's in-progress work.  (Maarten)
 - Don't allocate space in crtc_state for intermediate watermarks on
   platforms that don't need it (gen9+).
 - Move WaCxSRDisabledForSpriteScaling:ivb into intel_begin_crtc_commit
   now that ilk_update_wm is gone.

v4:
 - Add a wm_mutex to cover updates to intel_crtc->active and the
   need_postvbl_update flag.  Since we don't have async yet it isn't
   terribly important yet, but might as well add it now.
 - Change interface to program watermarks.  Platforms will now expose
   .initial_watermarks() and .optimize_watermarks() functions to do
   watermark programming.  These should lock wm_mutex, copy the
   appropriate state values into intel_crtc->active, and then call
   the internal program watermarks function.

v5:
 - Skip intermediate watermark calculation/check during initial hardware
   readout since we don't trust the existing HW values (and don't have
   valid values of our own yet).
 - Don't try to call .optimize_watermarks() on platforms that don't have
   atomic watermarks yet.  (Maarten)

v6:
 - Rebase

v7:
 - Further rebase

v8:
 - A few minor indentation and line length fixes

v9:
 - Yet another rebase since Maarten's patches reworked a bunch of the
   code (wm_pre, wm_post, etc.) that this was previously based on.

v10:
 - Move wm_mutex to dev_priv to protect against racing commits against
   disjoint CRTC sets. (Maarten)
 - Drop unnecessary clearing of cstate->wm.need_postvbl_update (Maarten)

v11:
 - Now that we've moved to atomic watermark updates, make sure we call
   the proper function to program watermarks in
   {ironlake,haswell}_crtc_enable(); the failure to do so on the
   previous patch iteration led to us not actually programming the
   watermarks before turning on the CRTC, which was the cause of the
   underruns that the CI system was seeing.
 - Fix inverted logic for determining when to optimize watermarks.  We
   were needlessly optimizing when the intermediate/optimal values were
   the same (harmless), but not actually optimizing when they differed
   (also harmless, but wasteful from a power/bandwidth perspective).

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456276813-5689-1-git-send-email-matthew.d.roper@intel.com

drm/i915: Update DRIVER_DATE to 20160229

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Execlists cannot pin a context without the object

Given that the intel_lr_context_pin cannot succeed without the object,
we cannot reach intel_lr_context_unpin() without first allocating that
object - so we can remove the redundant test.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456485751-15213-1-git-send-email-tvrtko.ursulin@linux.intel.com

drm/i915: Reduce the pointer dance of i915_is_ggtt()

The multiple levels of indirect do nothing but hinder the compiler and
the pointer chasing turns to be quite painful but painless to fix.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456484600-11477-1-git-send-email-tvrtko.ursulin@linux.intel.com

drm/i915: Rename vma->*_list to *_link for consistency

Elsewhere we have adopted the convention of using '_link' to denote
elements in the list (and '_list' for the actual list_head itself), and
that the name should indicate which list the link belongs to (and
preferrably not just where the link is being stored).

s/vma_link/obj_link/ (we iterate over obj->vma_list)
s/mm_list/vm_link/ (we iterate over vm->[in]active_list)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

drm/i915: Balance assert_rpm_wakelock_held() for !IS_ENABLED(CONFIG_PM)

commit 09731280028ce03e6a27e1998137f1775a2839f3
Author: Imre Deak <imre.deak@intel.com>
Date:   Wed Feb 17 14:17:42 2016 +0200

    drm/i915: Add helper to get a display power ref if it was already enabled

left the rpm wakelock assertions unbalanced if CONFIG_PM was disabled as
intel_runtime_pm_get_if_in_use() would return true without incrementing
the local bookkeeping required for the assertions.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
CC: Mika Kuoppala <mika.kuoppala@intel.com>
CC: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
CC: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456434628-22574-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915/lrc: Only set RS ctx enable in ctx control reg if there is a RS

The driver should only set the "RS context enable" bit in the context
image if we plan to use the resource streamer.

Reviewed-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456393738-35608-1-git-send-email-michel.thierry@intel.com

drm/i915/gen9: Set value of Indirect Context Offset based on gen version

The cache line offset for the Indirect CS context (0x21C8) varies from gen
to gen.

v2: Move it into a function (Arun), use MISSING_CASE (Chris)
v3: Rebased (catched by ci bat)

Cc: Arun Siluvery <arun.siluvery@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456223509-6454-1-git-send-email-michel.thierry@intel.com

drm/i915: Remove update_sprite_watermarks.

Commit 791a32be6eb2 ("drm/i915: Drop intel_update_sprite_watermarks")
removes the use of this variable, but forgot to remove it.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455108583-29227-5-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Kill off intel_crtc->atomic.wait_vblank, v6.

Currently we perform our own wait in post_plane_update,
but the atomic core performs another one in wait_for_vblanks.
This means that 2 vblanks are done when a fb is changed,
which is a bit overkill.

Merge them by creating a helper function that takes a crtc mask
for the planes to wait on.

The broadwell vblank workaround may look gone entirely but this is
not the case. pipe_config->wm_changed is set to true
when any plane is turned on, which forces a vblank wait.

Changes since v1:
- Removing the double vblank wait on broadwell moved to its own commit.
Changes since v2:
- Move out POWER_DOMAIN_MODESET handling to its own commit.
Changes since v3:
- Do not wait for vblank on legacy cursor updates. (Ville)
- Move broadwell vblank workaround comment to page_flip_finished. (Ville)
Changes since v4:
- Compile fix, legacy_cursor_flip -> *_update.
Changes since v5:
- Kill brackets.
- Add WARN_ON when wait_for_vblanks fails.
- Remove extra newlines.
- Split the checks whether vblank is needed to a separate function,
  with comments why a vblank is needed.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56CD84DA.5030507@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Unify power domain handling.

Right now there's separate power domain handling for update_pipe and
modesets. Unify this and only grab POWER_DOMAIN_MODESET once.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455108583-29227-3-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Pass crtc state to modeset_get_crtc_power_domains.

Use our newly created encoder_mask to iterate over the encoders.
This makes it possible to get the crtc power domains from the
crtc_state at any time, without any locks or having to look at
the legacy state.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455108583-29227-2-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

drm/i915: Add for_each_pipe_masked()

for_each_pipe_masked() can be used to iterate over the pipes
included in the user provided pipe mask. Removes a few lines of
duplicated code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455907651-16397-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Make sure pipe interrupts are processed before turning off power well on BDW+

Starting from BDW the DE_PIPE interrupts for pipe B and C belong to the
relevant display power well. So we should make sure we've finished
processing them before turning off the power well.

The pipe interrupts shouldn't really happen at this point anymore since
we've already shut down the planes/pipes/whatnot, but being a bit
paranoid shouldn't hurt.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455907651-16397-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: synchronize_irq() before turning off disp2d power well on VLV/CHV

After we've told the irq code we don't want to handle display irqs
anymore, we must make sure any display irq handling already
kicked off has finished before we actually turn off the power well.

I wouldn't expect PIPESTAT based interrupts to occur anymore since
vblanks/page flips/gmbus/etc should all be quiescent at this point.
But at least hotplug interrupts could still occur. Hotplug
interrupts may also kick off the workqueue based hotplug processing,
but that code should take the required power domain references
itself, so there shouldn't be any need to synchronize with the
hotplug processing from the power well code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455900112-15387-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915: Skip PIPESTAT reads from irq handler on VLV/CHV when power well is down

PIPESTAT registers live in the display power well on VLV/CHV, so we
shouldn't access them when things are powered down. Let's check
whether the display interrupts are on or off before accessing the
PIPESTAT registers.

Another option would be to read the PIPESTAT registers only when
the IIR register indicates that there's a pending pipe event. But
that would mean we might miss even more underrun reports than we
do now, because the underrun status bit lives in PIPESTAT but doesn't
actually generate an interrupt.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93738
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455825266-24686-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drm/i915/gen9: Write dc state debugmask bits only once

DMC debugmask bits should stick so no need to write them
everytime dc state is changed.

v2: Write after firmware has been successfully loaded (Ville)

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455808874-22089-5-git-send-email-mika.kuoppala@intel.com

drm/i915/gen9: Extend dmc debug mask to include cores

Cores need to be included into the debug mask. We don't exactly
know what it does but the spec says it must be enabled. So obey.

v2: Cores should be only set for BXT (Imre, Art)

Cc: Imre Deak <imre.deak@intel.com>
Cc: Runyan, Arthur J <arthur.j.runyan@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455877564-5128-1-git-send-email-mika.kuoppala@intel.com

drm/i915/gen9: Verify and enforce dc6 state writes

It has been observed that sometimes disabling the dc6 fails
and dc6 state pops back up, brief moment after disabling. This
has to be dmc save/restore timing issue or other bug in the
way dc states are handled.

Try to work around this issue as we don't have firmware fix
yet available. Verify that the value we wrote for the dmc sticks,
and also enforce it by rewriting it, if it didn't.

v2: Zero rereads on rewrite for extra paranoia (Imre)

Testcase: kms_flip/basic-flip-vs-dpms
References: https://bugs.freedesktop.org/show_bug.cgi?id=93768
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455811089-27884-1-git-send-email-mika.kuoppala@intel.com

drm/i915/gen9: Check for DC state mismatch

The DMC can incorrectly run off and allow DC states on it's own. We
don't know the root-cause for this yet but this patch makes it more
visible.

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455808874-22089-2-git-send-email-mika.kuoppala@intel.com

drm/i915/fbc: enable FBC by default on HSW and BDW

These platforms should be fine now.

FBC can allow very significant power savings for screen-on idle
systems, but it is worth mentioning that a lot of people won't get
significant power savings by enabling this feature because they may
have something else preventing the system from getting into the
deepest sleep states. Examples may include a hungry wifi device or a
max_performance SATA link power management policy. You can check your
PC state residencies on the powertop "Idle stats" tab. I recommend
trying to run "sudo powertop --auto-tune" and then seeing if the
residencies improve.

Oh, and in case you - the person reading this commit message - found
this commit through git bisect, please do the following:
 - Check your dmesg and see if there are error messages mentioning
   underruns around the time your problem started happening.
 - Download intel-gpu-tools, compile it, and run:
   $ sudo ./tests/kms_frontbuffer_tracking --run-subtest '*fbc-*' 2>&1 | tee fbc.txt
   Then send us the fbc.txt file, especially if you get a failure.
   This will really maximize your chances of getting the bug fixed
   quickly.
 - Try to find a reliable way to reproduce the problem, and tell us.
 - Boot with drm.debug=0xe, reproduce the problem, then send us the
   dmesg file.

v2: Don't enable by default on SKL.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455655643-2535-1-git-send-email-paulo.r.zanoni@intel.com

drm/i915: drop unused i915.disable_vtd_wa module parameter

This is a manual revert of

commit 7a10dfa638be26669f0987b6a21a65e6b39356b2
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Apr 1 09:33:47 2014 +0200

    drm/i915: Add debug module option for VTd validation

as no users have appeared.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455621493-6865-2-git-send-email-jani.nikula@intel.com

drm/i915: drop write perm from module params which don't support changing

We've given write permissions to dynamically change some module
parameters through /sys/module/i915/parameters although they only
support setting on module load. Fix the permissions.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455621493-6865-1-git-send-email-jani.nikula@intel.com

drm/i915/dsi: Using the bpp value wrt the pixel format

The bpp value which is used while calulating the txbyteclkhs values
should be wrt the pixel format value. Currently bpp is coming
from pipe config to calculate txbyteclkhs. Fix it in this patch.

V2: dsi_pixel_format_bpp is used to retrieve the bpp from pixel_format
[Review: Jani]

Signed-off-by: Deepak M <m.deepak@intel.com>
Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Tested-by: Mika Kahola <mika.kahola@intel.com> # BYT
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455203007-10850-1-git-send-email-ramalingam.c@intel.com

drm/i915/bxt: Remove DSP CLK_GATE programming for BXT

DSP CLK_GATE registers are specific to BYT and CHT.
Avoid programming the same for BXT platform.

v2: Rebased on latest drm nightly branch.

v3: Fixed Jani's review comments

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455796166-13052-1-git-send-email-jani.nikula@intel.com

drm/i915/skl: Ensure HW is powered during DDB HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Spotted-by: Mika Kuoppala <mika.kuoppala@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93441
CC: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455719489-3008-1-git-send-email-imre.deak@intel.com

drm/i915: Extract intel_encoder_has_connectors()

We have an open coded loop which tries to see if the encoder has any
connectors linked to it. Let's extract that to a helper similar to
intel_crtc_has_encoders().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455737325-14777-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Use atomic state in intel_fb_initial_config.

This is another step in removing legacy state.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-6-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Use correct dpms for intel_enable_crt.

With the conversion to atomic only on/off are still supported.
The rest is mapped to one of those, and when enable is called
DPMS_ON should be true.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-5-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Use atomic state in tv load detection.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-4-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Use atomic state for load detect in crt.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-3-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Use atomic state to obtain load detection crtc, v3.

Instead of restoring dpms and a flag for whether a temp fb is allocated duplicate
an atomic state before the new state is committed, and commit it the old state
in intel_release_load_detect_pipe.

Changes since v1:
- Use a real atomic state. (Ville)
Changes since v2:
- Do not preserve shared_dpll any more, no need to do so. (Ville)

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-2-git-send-email-maarten.lankhorst@linux.intel.com

drm/i915: Enable PSR by default on Haswell and Broadwell.

With a reliable frontbuffer tracking and all instability corner cases
on Haswell and Broadwell solved let's re-enabled PSR by default on
these platforms.

In case a new issue is found and PSR is the main suspect, please check
if i915.enable_psr=0 really makes your problem go away. If this is the case
PSR is the culprit so after that please check if i915.enable_psr=2
or i915.enable_psr=3 solves your issue and please let us know.
There are many panels out there and not all implementations apparently
work as we would expect.

In case you needed to force it on standby or disabled or in case of any
PSR related bug please report it at bugs.freedesktop.org.
In a bugzilla entry for PSR is desirable:
- dmesg (drm.debug=0xe)
- output of /sys/kernel/debug/dri/0/i915_edp_psr_status
- Platform information. Vendor, model, id, pci id.
- Graphical environment: Gnome, KDE, openbox, etc...
- Details how to reproduce.
- Also good if you could run PSR test cases of Intel-gpu-tools
- Please mention if forcing main link standby or main link off helps you.

There are Intel-gpu-tools test cases that can be helpful to
determine if PSR is working as expected:
kms_psr_sink_crc and kms_psr_frontbuffer_tracking.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455278893-1307-2-git-send-email-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Enable PSR by default on Valleyview and Cherryview.

With a reliable frontbuffer tracking and all instability corner cases
solved for this platform let's re-enabled PSR by default.

In case a new issue is found and PSR is the main suspect, please check
if i915.enable_psr=0 really makes your problem go away,
please report it at bugs.freedesktop.org.

In a bugzilla entry for PSR is desirable:
- dmesg (drm.debug=0xe)
- output of /sys/kernel/debug/dri/0/i915_edp_psr_status
- Platform information. Vendor, model, id, pci id.
- Graphical environment: Gnome, KDE, openbox, etc...
- Details how to reproduce.
- Also good if you could run PSR test cases of Intel-gpu-tools
- Please mention if forcing main link standby or main link off helps you.

There are Intel-gpu-tools test cases that can be helpful to
determine if PSR is working as expected:
 kms_psr_sink_crc and kms_psr_frontbuffer_tracking.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Change i915.enable_psr parameter to use per platform default.

This will give us flexibility to enable PSR by default independently so
issues and corner cases in one platform won't affect others were we have
it working properly.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

i915: cast before shifting in i915_pte_count

Otherwise a pde_shift big enough to overflow a u32 will be truncated before
assignment

Note: We never asked for ranges spanning a 4G boundary, so this issue
doesn't cause a real problem.

Signed-off-by: Alan Cox <alan@linux.intel.com>
[danvet: Add note why this isn't a real problem.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20160217142043.4947.60447.stgit@localhost.localdomain

drm/i915/lvds: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-13-git-send-email-imre.deak@intel.com

drm/i915/hdmi: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-12-git-send-email-imre.deak@intel.com

drm/i915/dsi: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-11-git-send-email-imre.deak@intel.com

drm/i915/dp: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-10-git-send-email-imre.deak@intel.com

drm/i915: Ensure the HW is powered when accessing the CRC HW block

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

While at it also add the missing reference around the HW access in
i915_interrupt_info().

v2:
- update the commit message mentioning that this also fixes the
  HW access in the interrupt info debugfs entry (Daniel)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-9-git-send-email-imre.deak@intel.com

drm/i915/ddi: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

CC: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-8-git-send-email-imre.deak@intel.com

drm/i915/crt: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93439
CC: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-7-git-send-email-imre.deak@intel.com

drm/i915: Ensure the HW is powered during HW access in assert_pipe

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-6-git-send-email-imre.deak@intel.com

drm/i915: Ensure the HW is powered when disabling VGA

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-5-git-send-email-imre.deak@intel.com

drm/i915/ibx: Ensure the HW is powered during PLL HW readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-4-git-send-email-imre.deak@intel.com

drm/i915: Ensure the HW is powered during display pipe HW readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Revieved-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-3-git-send-email-imre.deak@intel.com

drm/i915: Add helper to get a display power ref if it was already enabled

We have many places in the code where we check if a given display power
domain is enabled and if so access registers backed by this power
domain. We assumed that some modeset lock will prevent the power
reference from vanishing in the middle of the HW access, but this
assumption doesn't always hold. In such cases we get either the wakeref
not held, or an unclaimed register access error message. To fix this in
a future-proof way that's independent of other locks wrap any such
access with a get_ref_if_enabled()/put_ref() pair.

Kudos to Ville and Joonas for the ideas of this new interface.

v2:
- init the power_domains ptr when declaring it everywhere (Joonas)
v3:
- don't report the device to be powered if runtime PM is disabled

CC: Mika Kuoppala <mika.kuoppala@intel.com>
CC: Chris Wilson <chris@chris-wilson.co.uk>
CC: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
CC: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455711462-7442-1-git-send-email-imre.deak@intel.com

drm/i915: Add an optional selection from i915 of CONFIG_MMU_NOTIFIER

userptr requires mmu-notifier for full unprivileged support. Most
systems have mmu-notifier support already enabled as a requirement for
virtualisation support, but we should make the option for i915 to take
advantage of mmu-notifiers explicit (and enable by default so that
regular userspace can take advantage of passing client memory to the
GPU.)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452503961-14837-3-git-send-email-chris@chris-wilson.co.uk

drm/i915: Lock mode_config.mutex in intel_display_resume.

Unfortunately i915 is still not fully atomic, and expects mode_config.mutex
to be held during modeset until we finally fix it.

This fixes the following WARN when resuming:

[  425.208983] ------------[ cut here ]------------
[  425.208990] WARNING: CPU: 0 PID: 6828 at drivers/gpu/drm/drm_edid.c:3555 drm_select_eld+0xa5/0xd0()
[  425.209015] Modules linked in: pl2303 usbserial snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec snd_hwdep lpc_ich snd_hda_core snd_pcm i2c_hid i2c_designware_platform i2c_designware_core r8169 mii sdhci_acpi sdhci mmc_core
[  425.209018] CPU: 0 PID: 6828 Comm: kworker/u4:5 Tainted: G     U  W       4.5.0-rc4-gfxbench+ #1
[  425.209020] Hardware name: \xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff \xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff/DN2820FYK, BIOS FYBYT10H.86A.0038.2014.0717.1455 07/17/2014
[  425.209027] Workqueue: events_unbound async_run_entry_fn
[  425.209032]  0000000000000000 ffff880072433958 ffffffff813f6b05 0000000000000000
[  425.209036]  ffffffff81aaef2d ffff880072433990 ffffffff81078291 ffff880036b933d8
[  425.209039]  ffff88006d528000 ffff88006d52b3d8 ffff88006d52b3d8 ffff88007315b6f8
[  425.209040] Call Trace:
[  425.209045]  [<ffffffff813f6b05>] dump_stack+0x67/0x92
[  425.209049]  [<ffffffff81078291>] warn_slowpath_common+0x81/0xc0
[  425.209052]  [<ffffffff81078385>] warn_slowpath_null+0x15/0x20
[  425.209054]  [<ffffffff8151e195>] drm_select_eld+0xa5/0xd0
[  425.209101]  [<ffffffffa01f34f4>] intel_audio_codec_enable+0x44/0x160 [i915]
[  425.209135]  [<ffffffffa023eac7>] intel_enable_hdmi_audio+0x87/0x90 [i915]
[  425.209169]  [<ffffffffa023eb5a>] g4x_enable_hdmi+0x8a/0xa0 [i915]
[  425.209202]  [<ffffffffa023f41b>] vlv_hdmi_pre_enable+0x1cb/0x240 [i915]
[  425.209236]  [<ffffffffa020edcf>] valleyview_crtc_enable+0x10f/0x290 [i915]
[  425.209270]  [<ffffffffa020ba49>] intel_atomic_commit+0x769/0x17a0 [i915]
[  425.209274]  [<ffffffff81526ad5>] ? drm_atomic_check_only+0x145/0x660
[  425.209276]  [<ffffffff81527022>] drm_atomic_commit+0x32/0x50
[  425.209310]  [<ffffffffa0215fa0>] intel_display_resume+0xa0/0x130 [i915]
[  425.209338]  [<ffffffffa018c1bb>] i915_drm_resume+0xcb/0x160 [i915]
[  425.209366]  [<ffffffffa018c272>] i915_pm_resume+0x22/0x30 [i915]
[  425.209370]  [<ffffffff8143d91e>] pci_pm_resume+0x6e/0xe0
[  425.209373]  [<ffffffff8143d8b0>] ? pci_pm_resume_noirq+0xa0/0xa0
[  425.209375]  [<ffffffff815409ae>] dpm_run_callback+0x6e/0x280
[  425.209378]  [<ffffffff815410b2>] device_resume+0x92/0x250
[  425.209380]  [<ffffffff81541288>] async_resume+0x18/0x40
[  425.209382]  [<ffffffff8109c7a5>] async_run_entry_fn+0x45/0x140
[  425.209386]  [<ffffffff81093293>] process_one_work+0x1e3/0x620
[  425.209388]  [<ffffffff810931f7>] ? process_one_work+0x147/0x620
[  425.209391]  [<ffffffff81093719>] worker_thread+0x49/0x490
[  425.209393]  [<ffffffff810936d0>] ? process_one_work+0x620/0x620
[  425.209396]  [<ffffffff81099e0a>] kthread+0xea/0x100
[  425.209400]  [<ffffffff81099d20>] ? kthread_create_on_node+0x1f0/0x1f0
[  425.209404]  [<ffffffff817ba03f>] ret_from_fork+0x3f/0x70
[  425.209407]  [<ffffffff81099d20>] ? kthread_create_on_node+0x1f0/0x1f0
[  425.209409] ---[ end trace d1b247107f34a8b2 ]---

Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455632862-18557-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915: Fix some minor issues with atomic cdclk.

The check for active_crtcs == 0 was performed by the callers, when changing
the patches I forgot to remove those hunks.

This resulted in skylake scalers still not having the correct cdclk to
calculate scaling when all crtc's were dpms off.

Fixes: 1a617b77658e ("drm/i915: Keep track of the cdclk as if all crtc's were active.")
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455614711-9045-1-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm/i915: Use atomic helpers for suspend, v2.

Instead of duplicating the functionality now that we no longer need
to preserve dpll state we can move to using the upstream suspend helper.

Changes since v1:
- Call hw readout with all mutexes held.
- Rework intel_display_suspend to only assign modeset_restore_state
  on success.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56C2E686.5060803@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm/i915: Check for get_pages instead of shmem (filp)

This behavior of checking for a shmem backed GEM object was introduced here:
commit 4c914c0c7c787b8f730128a8cdcca9c50b0784ab
Author: Brad Volkin <bradley.d.volkin@intel.com>
Date:   Tue Feb 18 10:15:45 2014 -0800

    drm/i915: Refactor shmem pread setup

It is possible for an object to not be a shmem backed GEM object (for example
userptr objects). An example of how we hit this failure can be found through
copy_batch() in the command parser because we allocate a userptr object for the
batch which contains privileged instructions. Userptr calls
drm_gem_private_object_init() which explicitly sets the filp to none.

NOTE: I manually retyped this from a test machine. So I haven't even compiled
this exact patch.

v2: Use same logic as from a2a4f916c2f (Kristian, Dave Gordon)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Kristian Høgsberg <krh@bitplanet.net>
Cc: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
Tested-by: Jordan Justen <jordan.l.justen@intel.com> (v1)
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455047053-2644-1-git-send-email-benjamin.widawsky@intel.com

drm/i915: Reject invalid-pad for context-destroy and -create ioctls

Unknown parameters, especially structure padding, are expected to invoke
rejection with -EINVAL.

v2: similar issue exists for context-create

Testcase: igt/gem_ctx_create/invalid-pad
Testcase: igt/gem_ctx_bad_destroy/invalid-pad
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89602
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93999
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1454690759-31201-1-git-send-email-chris@chris-wilson.co.uk

drm/i915: Add missing 'else' to intel_digital_port_connected()

intel_digital_port_connected() lacks one 'else'. There's no
actual harm in not having it since each branch has an unconditional
return, so it can't accidentally end up in taking two branches instead
of just the one. But let's be consistent and add the 'else' anyway.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455201868-31527-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

drm/i915: Fix hpd live status bits for g4x

Looks like g4x hpd live status bits actually agree with the spec. At
least they do on the machine I have, and apparently on Nick Bowler's
g4x as well.

So gm45 may be the only platform where they don't agree. At least
that seems to be the case based on the (somewhat incomplete)
logs/dumps in [1], and Daniel has also tested this on his gm45
sometime in the past.

So let's change the bits to match the spec on g4x. That actually makes
the g4x bits identical to vlv/chv so we can just share the code
between those platforms, leaving gm45 as the special case.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=52361

Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Sonika Jindal <sonika.jindal@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Nick Bowler <nbowler@draconx.ca>
References: https://lists.freedesktop.org/archives/dri-devel/2016-February/100382.html
Reported-by: Nick Bowler <nbowler@draconx.ca>
Cc: stable@vger.kernel.org
Fixes: 237ed86c693d ("drm/i915: Check live status before reading edid")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455127145-20087-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drm/i915/ilk: Move register read under spinlock

Code does read-modify-write but the read was outside the lock.

It is fine since the caller holds struct mutex, but if we
correct this we open up the opportunity for decreasing the
mutex duration time since the call to ironlake_enable_drps
does not need it any longer since it is covered by the
mchdev_lock lock.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1455186452-13691-2-git-send-email-tvrtko.ursulin@linux.intel.com