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drm/i915/psr: Apply Intel DPCD workaround when SDP on prior line used

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There is Intel specific workaround DPCD address containing workaround for
case where SDP is on prior line. Apply this workaround according to values
in the offset.

Fixes: 61e887329e ("drm/i915/xelpd: Handle PSR2 SDP indication in the prior scanline")
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260515095756.2799483-4-jouni.hogander@intel.com
(cherry picked from commit c3fe899fbeac86ea4a5ca9dd845b2cbc0da46249)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
This commit is contained in:
Jouni Högander 2026-05-15 12:57:55 +03:00 committed by Tvrtko Ursulin
parent f30bece421
commit 4703049f76
1 changed files with 31 additions and 4 deletions
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35
drivers/gpu/drm/i915/display/intel_psr.c
View File

@ -1365,9 +1365,35 @@ static bool psr2_granularity_check(struct intel_crtc_state *crtc_state,
return true;
}
static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
static bool apply_scanline_indication_wa(struct intel_crtc_state *crtc_state,
struct intel_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
u8 early_scanline_support = connector->dp.psr_caps.intel_wa_dpcd &
INTEL_DPCD_INTEL_WA_REGISTER_CAPS_PSR2_EARLYSCANLINE_SDP_SUPPORT_MASK;
if (intel_dp->edp_dpcd[0] >= DP_EDP_15)
return true;
switch (early_scanline_support) {
case INTEL_DPCD_INTEL_WA_REGISTER_CAPS_FALL_BACK_TO_PSR1:
crtc_state->req_psr2_sdp_prior_scanline = false;
return false;
case INTEL_DPCD_INTEL_WA_REGISTER_CAPS_PSR2_WITH_EARLY_SCANLINE:
return true;
case INTEL_DPCD_INTEL_WA_REGISTER_CAPS_PSR2_WITHOUT_EARLY_SCANLINE:
crtc_state->req_psr2_sdp_prior_scanline = false;
return true;
default:
MISSING_CASE(early_scanline_support);
return false;
}
}
static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_crtc_state *crtc_state,
struct intel_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_display *display = to_intel_display(intel_dp);
const struct drm_display_mode *adjusted_mode = &crtc_state->uapi.adjusted_mode;
u32 hblank_total, hblank_ns, req_ns;
@ -1386,7 +1412,8 @@ static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_dp *intel_d
return false;
crtc_state->req_psr2_sdp_prior_scanline = true;
return true;
return apply_scanline_indication_wa(crtc_state, connector);
}
static int intel_psr_entry_setup_frames(struct intel_dp *intel_dp,
@ -1667,7 +1694,7 @@ static bool intel_sel_update_config_valid(struct intel_crtc_state *crtc_state,
conn_state))
goto unsupported;
if (!_compute_psr2_sdp_prior_scanline_indication(intel_dp, crtc_state)) {
if (!_compute_psr2_sdp_prior_scanline_indication(crtc_state, connector)) {
drm_dbg_kms(display->drm,
"Selective update not enabled, SDP indication do not fit in hblank\n");
goto unsupported;