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drm/i915/display: Ensure we have "Frame Change" event in DSB commit

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We may have commit which doesn't have any non-arming plane register
writes. In that case there aren't "Frame Change" event before DSB vblank
evasion which hangs as PIPEDSL register is reading as 0 when PSR state is
SRDENT(PSR1) or DEEP_SLEEP(PSR2). Handle this by ensuring "Frame Change"
event at the begin of DSB commit if using PSR/PR.

v3: dsb_commit as a first parameter
v2: use intel_psr_trigger_frame_change_event

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250213064804.2077127-13-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander
2025-02-13 08:48:03 +02:00
parent fa27fa4806
commit ac76a51ddb
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/display/intel_display.c
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@@ -7740,6 +7740,14 @@ static void intel_atomic_dsb_finish(struct intel_atomic_state *state,
intel_crtc_planes_update_noarm(new_crtc_state->dsb_commit,
state, crtc);
/*
* Ensure we have "Frame Change" event when PSR state is
* SRDENT(PSR1) or DEEP_SLEEP(PSR2). Otherwise DSB vblank
* evasion hangs as PIPEDSL is reading as 0.
*/
intel_psr_trigger_frame_change_event(new_crtc_state->dsb_commit,
state, crtc);
intel_dsb_vblank_evade(state, new_crtc_state->dsb_commit);
if (intel_crtc_needs_color_update(new_crtc_state))