[PATCH v9 1/3] drm/i915/panelreplay: Panel replay workaround with VRR

[Animesh Manna]

Panel Replay VSC SDP not getting sent when VRR is enabled
and W1 and W2 are 0. So Program Set Context Latency in
TRANS_SET_CONTEXT_LATENCY register to at least a value of 1.
The same is applicable for PSR1/PSR2 as well.

HSD: 14015406119

v1: Initial version.
v2: Update timings stored in adjusted_mode struct. [Ville]
v3: Add WA in compute_config(). [Ville]
v4:
- Add DISPLAY_VER() check and improve code comment. [Rodrigo]
- Introduce centralized intel_crtc_vblank_delay(). [Ville]
v5: Move to crtc_compute_config(). [Ville]
v6: Restrict DISPLAY_VER till 14. [Mitul]
v7:
- Corrected code-comment. [Mitul]
- dev_priv local variable removed. [Jani]
v8: Introduce late_compute_config() which will take care late
vblank-delay adjustment. [Ville]
v9: Implementation simplified and split into multiple patches.

Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 50 +++++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_display.h |  2 +
 drivers/gpu/drm/i915/display/intel_vrr.c     | 13 -----
 3 files changed, 51 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index c2c388212e2e..be30eb22f3d1 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2512,9 +2512,21 @@ static int intel_crtc_compute_pipe_mode(struct intel_crtc_state *crtc_state)
 static int intel_crtc_compute_config(struct intel_atomic_state *state,
 				     struct intel_crtc *crtc)
 {
+	struct drm_connector *connector;
+	struct drm_connector_state *connector_state;
 	struct intel_crtc_state *crtc_state =
 		intel_atomic_get_new_crtc_state(state, crtc);
-	int ret;
+	int ret, i;
+
+	for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
+		struct intel_encoder *encoder =
+			to_intel_encoder(connector_state->best_encoder);
+
+		if (connector_state->crtc != &crtc->base)
+			continue;
+
+		intel_crtc_adjust_vblank_delay(crtc_state, encoder);
+	}
 
 	ret = intel_dpll_crtc_compute_clock(state, crtc);
 	if (ret)
@@ -3925,6 +3937,26 @@ bool intel_crtc_get_pipe_config(struct intel_crtc_state *crtc_state)
 	return true;
 }
 
+void intel_crtc_adjust_vblank_delay(struct intel_crtc_state *crtc_state,
+				    struct intel_encoder *encoder)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+
+	/*
+	 * wa_14015401596 for display versions 13, 14.
+	 * Program Set Context Latency in TRANS_SET_CONTEXT_LATENCY register
+	 * to at least a value of 1 when PSR1/PSR2/Panel Replay is enabled with VRR.
+	 * Value for TRANS_SET_CONTEXT_LATENCY is calculated by substracting
+	 * crtc_vdisplay from crtc_vblank_start, so incrementing crtc_vblank_start
+	 * by 1 if both are equal.
+	 */
+	if (crtc_state->vrr.enable && crtc_state->has_psr &&
+	    adjusted_mode->crtc_vblank_start == adjusted_mode->crtc_vdisplay &&
+	    IS_DISPLAY_VER(to_i915(crtc->base.dev), 13, 14))
+		adjusted_mode->crtc_vblank_start += 1;
+}
+
 int intel_dotclock_calculate(int link_freq,
 			     const struct intel_link_m_n *m_n)
 {
@@ -4783,10 +4815,26 @@ intel_modeset_pipe_config_late(struct intel_atomic_state *state,
 {
 	struct intel_crtc_state *crtc_state =
 		intel_atomic_get_new_crtc_state(state, crtc);
+	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 	struct drm_connector_state *conn_state;
 	struct drm_connector *connector;
 	int i;
 
+	if (crtc_state->vrr.enable) {
+		/*
+		 * For XE_LPD+, we use guardband and pipeline override
+		 * is deprecated.
+		 */
+		if (DISPLAY_VER(to_i915(crtc->base.dev)) >= 13) {
+			crtc_state->vrr.guardband =
+				crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;
+		} else {
+			crtc_state->vrr.pipeline_full =
+				min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
+				crtc_state->framestart_delay - 1);
+		}
+	}
+
 	for_each_new_connector_in_state(&state->base, connector,
 					conn_state, i) {
 		struct intel_encoder *encoder =
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index b0cf6ca70952..21fd330b8834 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -428,6 +428,8 @@ bool intel_crtc_is_joiner_primary(const struct intel_crtc_state *crtc_state);
 u8 intel_crtc_joiner_secondary_pipes(const struct intel_crtc_state *crtc_state);
 struct intel_crtc *intel_primary_crtc(const struct intel_crtc_state *crtc_state);
 bool intel_crtc_get_pipe_config(struct intel_crtc_state *crtc_state);
+void intel_crtc_adjust_vblank_delay(struct intel_crtc_state *crtc_state,
+				    struct intel_encoder *encoder);
 bool intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 			       const struct intel_crtc_state *pipe_config,
 			       bool fastset);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 5a0da64c7db3..46341367d250 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -242,19 +242,6 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 			(crtc_state->hw.adjusted_mode.crtc_vtotal -
 			 crtc_state->hw.adjusted_mode.vsync_end);
 	}
-
-	/*
-	 * For XE_LPD+, we use guardband and pipeline override
-	 * is deprecated.
-	 */
-	if (DISPLAY_VER(i915) >= 13) {
-		crtc_state->vrr.guardband =
-			crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;
-	} else {
-		crtc_state->vrr.pipeline_full =
-			min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
-			    crtc_state->framestart_delay - 1);
-	}
 }
 
 static u32 trans_vrr_ctl(const struct intel_crtc_state *crtc_state)
-- 
2.29.0