[Intel-gfx] [PATCH] drm/i915/display: Disable audio, DRRS and PSR before planes

* [Intel-gfx] [PATCH] drm/i915/display: Disable audio, DRRS and PSR before planes
@ 2021-07-26 18:15 José Roberto de Souza
  2021-07-26 18:29 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for " Patchwork
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: José Roberto de Souza @ 2021-07-26 18:15 UTC (permalink / raw)
  To: intel-gfx

HDMI and DisplayPort sequences states that audio and PSR should be
disabled before planes are disabled.
Not following it did not caused any problems up to Alderlake-P but
for this platform it causes underruns during the PSR2 disable
sequence.

Specification don't mention that DRRS should be disabled before planes
but it looks safer to switch back to the default refresh rate before
following with the rest of the pipe disable sequence.

BSpec: 49191
BSpec: 49190
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c      | 30 ++++++++++++-------
 drivers/gpu/drm/i915/display/intel_display.c  | 24 +++++++++++++++
 .../drm/i915/display/intel_display_types.h    |  4 +++
 drivers/gpu/drm/i915/display/intel_dp_mst.c   | 14 +++++++--
 4 files changed, 59 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 26a3aa73fcc43..061a663f43b84 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3204,12 +3204,6 @@ static void intel_disable_ddi_dp(struct intel_atomic_state *state,
 
 	intel_dp->link_trained = false;
 
-	if (old_crtc_state->has_audio)
-		intel_audio_codec_disable(encoder,
-					  old_crtc_state, old_conn_state);
-
-	intel_edp_drrs_disable(intel_dp, old_crtc_state);
-	intel_psr_disable(intel_dp, old_crtc_state);
 	intel_edp_backlight_off(old_conn_state);
 	/* Disable the decompression in DP Sink */
 	intel_dp_sink_set_decompression_state(intel_dp, old_crtc_state,
@@ -3227,10 +3221,6 @@ static void intel_disable_ddi_hdmi(struct intel_atomic_state *state,
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	struct drm_connector *connector = old_conn_state->connector;
 
-	if (old_crtc_state->has_audio)
-		intel_audio_codec_disable(encoder,
-					  old_crtc_state, old_conn_state);
-
 	if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
 					       false, false))
 		drm_dbg_kms(&i915->drm,
@@ -3238,6 +3228,25 @@ static void intel_disable_ddi_hdmi(struct intel_atomic_state *state,
 			    connector->base.id, connector->name);
 }
 
+static void intel_pre_disable_ddi(struct intel_atomic_state *state,
+				  struct intel_encoder *encoder,
+				  const struct intel_crtc_state *old_crtc_state,
+				  const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp *intel_dp;
+
+	if (old_crtc_state->has_audio)
+		intel_audio_codec_disable(encoder, old_crtc_state,
+					  old_conn_state);
+
+	if (intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_HDMI))
+		return;
+
+	intel_dp = enc_to_intel_dp(encoder);
+	intel_edp_drrs_disable(intel_dp, old_crtc_state);
+	intel_psr_disable(intel_dp, old_crtc_state);
+}
+
 static void intel_disable_ddi(struct intel_atomic_state *state,
 			      struct intel_encoder *encoder,
 			      const struct intel_crtc_state *old_crtc_state,
@@ -4590,6 +4599,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	encoder->enable = intel_enable_ddi;
 	encoder->pre_pll_enable = intel_ddi_pre_pll_enable;
 	encoder->pre_enable = intel_ddi_pre_enable;
+	encoder->pre_disable = intel_pre_disable_ddi;
 	encoder->disable = intel_disable_ddi;
 	encoder->post_disable = intel_ddi_post_disable;
 	encoder->update_pipe = intel_ddi_update_pipe;
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index bb0aebcc3ecd3..cf58df9132748 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3195,6 +3195,28 @@ static void intel_encoders_enable(struct intel_atomic_state *state,
 	}
 }
 
+static void intel_encoders_pre_disable(struct intel_atomic_state *state,
+				       struct intel_crtc *crtc)
+{
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+	const struct drm_connector_state *old_conn_state;
+	struct drm_connector *conn;
+	int i;
+
+	for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
+		struct intel_encoder *encoder =
+			to_intel_encoder(old_conn_state->best_encoder);
+
+		if (old_conn_state->crtc != &crtc->base)
+			continue;
+
+		if (encoder->pre_disable)
+			encoder->pre_disable(state, encoder, old_crtc_state,
+					     old_conn_state);
+	}
+}
+
 static void intel_encoders_disable(struct intel_atomic_state *state,
 				   struct intel_crtc *crtc)
 {
@@ -10327,6 +10349,8 @@ static void intel_old_crtc_state_disables(struct intel_atomic_state *state,
 
 	drm_WARN_ON(&dev_priv->drm, old_crtc_state->bigjoiner_slave);
 
+	intel_encoders_pre_disable(state, crtc);
+
 	intel_crtc_disable_planes(state, crtc);
 
 	/*
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 19d8d3eefbc27..34ec83fc71670 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -196,6 +196,10 @@ struct intel_encoder {
 	void (*update_complete)(struct intel_atomic_state *,
 				struct intel_encoder *,
 				struct intel_crtc *);
+	void (*pre_disable)(struct intel_atomic_state *,
+			    struct intel_encoder *,
+			    const struct intel_crtc_state *,
+			    const struct drm_connector_state *);
 	void (*disable)(struct intel_atomic_state *,
 			struct intel_encoder *,
 			const struct intel_crtc_state *,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index e2eb46337369e..8d13d7b26a25b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -348,6 +348,16 @@ static void wait_for_act_sent(struct intel_encoder *encoder,
 	drm_dp_check_act_status(&intel_dp->mst_mgr);
 }
 
+static void intel_mst_pre_disable_dp(struct intel_atomic_state *state,
+				     struct intel_encoder *encoder,
+				     const struct intel_crtc_state *old_crtc_state,
+				     const struct drm_connector_state *old_conn_state)
+{
+	if (old_crtc_state->has_audio)
+		intel_audio_codec_disable(encoder, old_crtc_state,
+					  old_conn_state);
+}
+
 static void intel_mst_disable_dp(struct intel_atomic_state *state,
 				 struct intel_encoder *encoder,
 				 const struct intel_crtc_state *old_crtc_state,
@@ -372,9 +382,6 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
 	if (ret) {
 		drm_dbg_kms(&i915->drm, "failed to update payload %d\n", ret);
 	}
-	if (old_crtc_state->has_audio)
-		intel_audio_codec_disable(encoder,
-					  old_crtc_state, old_conn_state);
 }
 
 static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
@@ -903,6 +910,7 @@ intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe
 
 	intel_encoder->compute_config = intel_dp_mst_compute_config;
 	intel_encoder->compute_config_late = intel_dp_mst_compute_config_late;
+	intel_encoder->pre_disable = intel_mst_pre_disable_dp;
 	intel_encoder->disable = intel_mst_disable_dp;
 	intel_encoder->post_disable = intel_mst_post_disable_dp;
 	intel_encoder->update_pipe = intel_ddi_update_pipe;
-- 
2.32.0

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