We need a power_domain wakeref in pps_{lock,unlock} to prevent
a race while resetting pps state in intel_power_sequencer_reset().
intel_power_sequencer_reset() need a pps_mutex to access pps_pipe
but it can't grab pps_mutex due to deadlock with power_well
functions are called while holding pps_mutex.
intel_power_sequencer_reset() is called by power_well function
associated with legacy platforms like vlv and chv therefore re-use
the POWER_DOMAIN_DISPLAY_CORE power domain, which only used
by vlv and chv display power domain.
This will avoids the unnecessary noise of unrelated power wells
in pps_{lock,unlock}.
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 8a00e609085f..4f190a82d4ad 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -895,9 +895,7 @@ pps_lock(struct intel_dp *intel_dp)
* See intel_power_sequencer_reset() why we need
* a power domain reference here.
*/
- wakeref = intel_display_power_get(dev_priv,
- intel_aux_power_domain(dp_to_dig_port(intel_dp)));
-
+ wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
mutex_lock(&dev_priv->pps_mutex);
return wakeref;
@@ -909,9 +907,7 @@ pps_unlock(struct intel_dp *intel_dp, intel_wakeref_t wakeref)
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
mutex_unlock(&dev_priv->pps_mutex);
- intel_display_power_put(dev_priv,
- intel_aux_power_domain(dp_to_dig_port(intel_dp)),
- wakeref);
+ intel_display_power_put(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref);
return 0;
}
--
2.26.2
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