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drm/i915/psr: Check drm_dp_dpcd_read return value on PSR dpcd init

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Currently we are ignoriong drm_dp_dpcd_read return values when reading PSR
and Panel Replay capability DPCD register. Rework intel_psr_dpcd a bit to
take care of checking the return value.

v2: use drm_dp_dpcd_read_data

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20250821045918.17757-1-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander
2025-08-21 07:59:17 +03:00
parent 2dbb3d70af
commit 9cc10041e9
1 changed files with 21 additions and 11 deletions
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32
drivers/gpu/drm/i915/display/intel_psr.c
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@@ -580,6 +580,16 @@ exit:
static void _panel_replay_init_dpcd(struct intel_dp *intel_dp)
{
struct intel_display *display = to_intel_display(intel_dp);
int ret;
ret = drm_dp_dpcd_read_data(&intel_dp->aux, DP_PANEL_REPLAY_CAP_SUPPORT,
&intel_dp->pr_dpcd, sizeof(intel_dp->pr_dpcd));
if (ret < 0)
return;
if (!(intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_SUPPORT)] &
DP_PANEL_REPLAY_SUPPORT))
return;
if (intel_dp_is_edp(intel_dp)) {
if (!intel_alpm_aux_less_wake_supported(intel_dp)) {
@@ -611,6 +621,15 @@ static void _panel_replay_init_dpcd(struct intel_dp *intel_dp)
static void _psr_init_dpcd(struct intel_dp *intel_dp)
{
struct intel_display *display = to_intel_display(intel_dp);
int ret;
ret = drm_dp_dpcd_read_data(&intel_dp->aux, DP_PSR_SUPPORT, intel_dp->psr_dpcd,
sizeof(intel_dp->psr_dpcd));
if (ret < 0)
return;
if (!intel_dp->psr_dpcd[0])
return;
drm_dbg_kms(display->drm, "eDP panel supports PSR version %x\n",
intel_dp->psr_dpcd[0]);
@@ -656,18 +675,9 @@ static void _psr_init_dpcd(struct intel_dp *intel_dp)
void intel_psr_init_dpcd(struct intel_dp *intel_dp)
{
drm_dp_dpcd_read(&intel_dp->aux, DP_PSR_SUPPORT, intel_dp->psr_dpcd,
sizeof(intel_dp->psr_dpcd));
_psr_init_dpcd(intel_dp);
drm_dp_dpcd_read(&intel_dp->aux, DP_PANEL_REPLAY_CAP_SUPPORT,
&intel_dp->pr_dpcd, sizeof(intel_dp->pr_dpcd));
if (intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_SUPPORT)] &
DP_PANEL_REPLAY_SUPPORT)
_panel_replay_init_dpcd(intel_dp);
if (intel_dp->psr_dpcd[0])
_psr_init_dpcd(intel_dp);
_panel_replay_init_dpcd(intel_dp);
if (intel_dp->psr.sink_psr2_support ||
intel_dp->psr.sink_panel_replay_su_support)