From 177246a84d133888b5428e44201282d94635f473 Mon Sep 17 00:00:00 2001 From: Matt Roper Date: Fri, 4 Mar 2016 15:59:39 -0800 Subject: [PATCH] drm/i915: Wait until after wm optimization to drop runtime PM reference MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit At the end of an atomic commit, we currently wait for vblanks to complete, call put() on the various runtime PM references, and then try to optimize our watermarks (on platforms that need two-step watermark programming). This can lead to watermark registers being programmed while the power well is powered down. We need to wait until after watermark optimization is complete before dropping our runtime power references. Note that in the future the watermark optimization is probably going to move to an asynchronous workqueue task that happens at some arbitrary point after vblank. When we make that change, we'll no longer necessarily be operating under the power reference held here, so we'll need to wrap the watermark register programmin in a call to intel_runtime_pm_get_if_in_use() or similar. Cc: arun.siluvery@linux.intel.com Cc: ville.syrjala@linux.intel.com Cc: maarten.lankhorst@linux.intel.com Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94349 Fixes: ed4a6a7ca853 ("drm/i915: Add two-stage ILK-style watermark programming (v11)") Signed-off-by: Matt Roper Signed-off-by: Imre Deak Reviewed-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1457135979-23727-1-git-send-email-matthew.d.roper@intel.com --- drivers/gpu/drm/i915/intel_display.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 602d23cd2b0c..47332a164fcb 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -13613,16 +13613,6 @@ static int intel_atomic_commit(struct drm_device *dev, if (!state->legacy_cursor_update) intel_atomic_wait_for_vblanks(dev, dev_priv, crtc_vblank_mask); - for_each_crtc_in_state(state, crtc, old_crtc_state, i) { - intel_post_plane_update(to_intel_crtc_state(old_crtc_state)); - - if (put_domains[i]) - modeset_put_power_domains(dev_priv, put_domains[i]); - } - - if (intel_state->modeset) - intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET); - /* * Now that the vblank has passed, we can go ahead and program the * optimal watermarks on platforms that need two-step watermark @@ -13637,6 +13627,16 @@ static int intel_atomic_commit(struct drm_device *dev, dev_priv->display.optimize_watermarks(intel_cstate); } + for_each_crtc_in_state(state, crtc, old_crtc_state, i) { + intel_post_plane_update(to_intel_crtc_state(old_crtc_state)); + + if (put_domains[i]) + modeset_put_power_domains(dev_priv, put_domains[i]); + } + + if (intel_state->modeset) + intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET); + mutex_lock(&dev->struct_mutex); drm_atomic_helper_cleanup_planes(dev, state); mutex_unlock(&dev->struct_mutex); -- 2.30.2