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drm/i915/psr: Fix for Panel Replay X granularity DPCD register handling

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DP specification is saying value 0xff 0xff in PANEL REPLAY SELECTIVE UPDATE
X GRANULARITY CAPABILITY registers (0xb2 and 0xb3) means full-line
granularity. Take this into account when handling Panel Replay X
granularity informed by the panel.

Fixes: 1cc8546474 ("drm/i915/psr: Use SU granularity information available in intel_connector")
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/7284
Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20260225074221.1744330-2-jouni.hogander@intel.com
(cherry picked from commit f5c8f824a4)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Jouni Högander
2026-02-25 09:42:21 +02:00
committed by Joonas Lahtinen
parent ace7dcc818
commit a99cac460d
1 changed files with 8 additions and 3 deletions
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11
drivers/gpu/drm/i915/display/intel_psr.c
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@@ -1307,9 +1307,14 @@ static bool psr2_granularity_check(struct intel_crtc_state *crtc_state,
u16 sink_y_granularity = crtc_state->has_panel_replay ?
connector->dp.panel_replay_caps.su_y_granularity :
connector->dp.psr_caps.su_y_granularity;
u16 sink_w_granularity = crtc_state->has_panel_replay ?
connector->dp.panel_replay_caps.su_w_granularity :
connector->dp.psr_caps.su_w_granularity;
u16 sink_w_granularity;
if (crtc_state->has_panel_replay)
sink_w_granularity = connector->dp.panel_replay_caps.su_w_granularity ==
DP_PANEL_REPLAY_FULL_LINE_GRANULARITY ?
crtc_hdisplay : connector->dp.panel_replay_caps.su_w_granularity;
else
sink_w_granularity = connector->dp.psr_caps.su_w_granularity;
/* PSR2 HW only send full lines so we only need to validate the width */
if (crtc_hdisplay % sink_w_granularity)