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drm/i915/psr: Panel Replay SU cap dpcd read return value

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Currently return value of drm_dpcd_readb is not checked when reading sink
Panel Replay Selective Update capabilities.

Fix this and switch to drm_dpcd_read_byte.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://lore.kernel.org/r/20250827060809.2461725-1-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander
2025-08-27 09:08:09 +03:00
parent 8bc70f2ea9
commit 90d8aad11f
1 changed files with 7 additions and 5 deletions
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12
drivers/gpu/drm/i915/display/intel_psr.c
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@@ -495,12 +495,14 @@ static u8 intel_dp_get_su_capability(struct intel_dp *intel_dp)
{
u8 su_capability = 0;
if (intel_dp->psr.sink_panel_replay_su_support)
drm_dp_dpcd_readb(&intel_dp->aux,
DP_PANEL_REPLAY_CAP_CAPABILITY,
&su_capability);
else
if (intel_dp->psr.sink_panel_replay_su_support) {
if (drm_dp_dpcd_read_byte(&intel_dp->aux,
DP_PANEL_REPLAY_CAP_CAPABILITY,
&su_capability) < 0)
return 0;
} else {
su_capability = intel_dp->psr_dpcd[1];
}
return su_capability;
}