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drm/xe/display: read PCON capability only when present

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Avoid reading the PCON capabilities redundantly on non-branch devices.

v2:
 - Make commit description more accurate. (Imre)
 - Clear intel_dp->pcon_dsc_dpcd irrespective of presense of PCON. (Imre)

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20250619042629.3980244-1-chaitanya.kumar.borah@intel.com
This commit is contained in:
Chaitanya Kumar Borah 2025-06-19 09:56:29 +05:30 committed by Suraj Kandpal
parent 4f9c81d64f
commit 07faff368d
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_dp.c
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@ -3726,6 +3726,9 @@ static void intel_dp_get_pcon_dsc_cap(struct intel_dp *intel_dp)
memset(intel_dp->pcon_dsc_dpcd, 0, sizeof(intel_dp->pcon_dsc_dpcd));
if (!drm_dp_is_branch(intel_dp->dpcd))
return;
if (drm_dp_dpcd_read(&intel_dp->aux, DP_PCON_DSC_ENCODER,
intel_dp->pcon_dsc_dpcd,
sizeof(intel_dp->pcon_dsc_dpcd)) < 0)