[PATCH v2 2/2] drm/i915/psr: Implement Wa 14019834836

[Jouni Högander]

This patch implements HW workaround 14019834836 for display version 30.

v2:
  - move Wa 14019834836 to it's own function
  - apply only for display version 30

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 36 ++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index f3db0f997ef31..eaa3dd40efc9e 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -2611,6 +2611,38 @@ static bool psr2_sel_fetch_pipe_state_supported(const struct intel_crtc_state *c
 	return true;
 }
 
+/* Wa 14019834836 */
+static void intel_psr_apply_pr_link_on_su_wa(struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_encoder *encoder;
+	int hactive_limit;
+
+	if (crtc_state->psr2_su_area.y1 != 0 ||
+	    crtc_state->psr2_su_area.y2 != 0)
+		return;
+
+	if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
+		hactive_limit = intel_dp_is_uhbr(crtc_state) ? 1230 : 546;
+	else
+		hactive_limit = intel_dp_is_uhbr(crtc_state) ? 615 : 273;
+
+	if (crtc_state->hw.adjusted_mode.hdisplay < hactive_limit)
+		return;
+
+	for_each_intel_encoder_mask_with_psr(display->drm, encoder,
+					     crtc_state->uapi.encoder_mask) {
+		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+		if (!intel_dp_is_edp(intel_dp) &&
+		    intel_dp->psr.panel_replay_enabled &&
+		    intel_dp->psr.sel_update_enabled) {
+			crtc_state->psr2_su_area.y2++;
+			return;
+		}
+	}
+}
+
 static void
 intel_psr_apply_su_area_workarounds(struct intel_crtc_state *crtc_state)
 {
@@ -2623,6 +2655,10 @@ intel_psr_apply_su_area_workarounds(struct intel_crtc_state *crtc_state)
 	      IS_ALDERLAKE_P(i915) || IS_TIGERLAKE(i915))) &&
 	    crtc_state->splitter.enable)
 		crtc_state->psr2_su_area.y1 = 0;
+
+	/* Wa 14019834836 */
+	if (DISPLAY_VER(display) == 30)
+		intel_psr_apply_pr_link_on_su_wa(crtc_state);
 }
 
 int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
-- 
2.34.1