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

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b63cdb23b222f811f3a1153d2377e31dd7917756..347d4df49a9bf37cc751d9bfdedde6701709b2f8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2851,7 +2851,10 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
        memset(ddb, 0, sizeof(*ddb));
 
        for_each_pipe(dev_priv, pipe) {
-               if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_PIPE(pipe)))
+               enum intel_display_power_domain power_domain;
+
+               power_domain = POWER_DOMAIN_PIPE(pipe);
+               if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                        continue;
 
                for_each_plane(dev_priv, pipe, plane) {
@@ -2863,6 +2866,8 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
                val = I915_READ(CUR_BUF_CFG(pipe));
                skl_ddb_entry_init_from_hw(&ddb->plane[pipe][PLANE_CURSOR],
                                           val);
+
+               intel_display_power_put(dev_priv, power_domain);
        }
 }