[PATCH v2] drm/i915/psr: Disable psr1 if setup_time > vblank

[Animesh Manna]

Issue is seen when PSR enabled with setup frames and when try to disable
PSR at SRDONACK State (0x1). PSR FSM is stuck at SRDONACK(0x1) for more
than 5 seconds. Issue not seen with Setup frames disabled. Currently
disable psr1 if setuptime > vblank to workaround the above issue.

HSD: 16024594674
WA: 18037818876

v1: Initial version
v2: Add debug log and some cosmetic changes. [Jouni, Jani, Nemesa]

Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 4176163ec19a..d8eb0d427d8c 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1640,6 +1640,15 @@ _panel_replay_compute_config(struct intel_dp *intel_dp,
 	return true;
 }
 
+static bool intel_psr_needs_wa_18037818876(struct intel_dp *intel_dp,
+					   struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(intel_dp);
+
+	return (DISPLAY_VER(display) == 20 && intel_dp->psr.entry_setup_frames > 0 &&
+		!crtc_state->has_sel_update);
+}
+
 void intel_psr_compute_config(struct intel_dp *intel_dp,
 			      struct intel_crtc_state *crtc_state,
 			      struct drm_connector_state *conn_state)
@@ -1686,6 +1695,13 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 		return;
 
 	crtc_state->has_sel_update = intel_sel_update_config_valid(intel_dp, crtc_state);
+
+	/* Wa_18037818876 */
+	if (intel_psr_needs_wa_18037818876(intel_dp, crtc_state)) {
+		crtc_state->has_psr = false;
+		drm_dbg_kms(display->drm,
+			    "PSR disabled to workaround PSR FSM hang issue\n");
+	}
 }
 
 void intel_psr_get_config(struct intel_encoder *encoder,
-- 
2.29.0