From: Jouni Högander jouni.hogander@intel.com
[ Upstream commit 9cc10041e9fe7f32c4817e3cdd806ff1986d266c ]
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 Stable-dep-of: f2687d3cc9f9 ("drm/i915/dp_mst: Disable Panel Replay") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/i915/display/intel_psr.c | 32 ++++++++++++++++-------- 1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c index 41988e193a415..88531c9be22cb 100644 --- a/drivers/gpu/drm/i915/display/intel_psr.c +++ b/drivers/gpu/drm/i915/display/intel_psr.c @@ -600,6 +600,16 @@ static void intel_dp_get_su_granularity(struct intel_dp *intel_dp) 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)) { @@ -631,6 +641,15 @@ 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]); @@ -676,18 +695,9 @@ 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)); - - 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); + _psr_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)