drm/i915: Move the initial fastset commit check to encoder hooks

Move the checks to decide whether a fastset is possible during the
initial commit to an encoder hook. This check is really encoder specific
and the next patch will also require this adding a DP encoder specific
check.

v2: Fix negated condition in gen11_dsi_initial_fastset_check().
v3: Make sure to call the hook for all encoders on the crtc. (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201005215311.1475666-1-imre.deak@intel.com

drivers/gpu/drm/i915/display/icl_dsi.c

@@ -1668,6 +1668,19 @@ static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder,
 	return ret;
 }
 
+static bool gen11_dsi_initial_fastset_check(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state)
+{
+	if (crtc_state->dsc.compression_enable) {
+		drm_dbg_kms(encoder->base.dev, "Forcing full modeset due to DSC being enabled\n");
+		crtc_state->uapi.mode_changed = true;
+
+		return false;
+	}
+
+	return true;
+}
+
 static void gen11_dsi_encoder_destroy(struct drm_encoder *encoder)
 {
 	intel_encoder_destroy(encoder);
@@ -1923,6 +1936,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	encoder->update_pipe = intel_panel_update_backlight;
 	encoder->compute_config = gen11_dsi_compute_config;
 	encoder->get_hw_state = gen11_dsi_get_hw_state;
+	encoder->initial_fastset_check = gen11_dsi_initial_fastset_check;
 	encoder->type = INTEL_OUTPUT_DSI;
 	encoder->cloneable = 0;
 	encoder->pipe_mask = ~0;

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -4564,6 +4564,15 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
 	intel_read_dp_sdp(encoder, pipe_config, DP_SDP_VSC);
 }
 
+static bool intel_ddi_initial_fastset_check(struct intel_encoder *encoder,
+					    struct intel_crtc_state *crtc_state)
+{
+	if (intel_crtc_has_dp_encoder(crtc_state))
+		return intel_dp_initial_fastset_check(encoder, crtc_state);
+
+	return true;
+}
+
 static enum intel_output_type
 intel_ddi_compute_output_type(struct intel_encoder *encoder,
 			      struct intel_crtc_state *crtc_state,
@@ -5173,6 +5182,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	encoder->update_pipe = intel_ddi_update_pipe;
 	encoder->get_hw_state = intel_ddi_get_hw_state;
 	encoder->get_config = intel_ddi_get_config;
+	encoder->initial_fastset_check = intel_ddi_initial_fastset_check;
 	encoder->suspend = intel_dp_encoder_suspend;
 	encoder->get_power_domains = intel_ddi_get_power_domains;
 

drivers/gpu/drm/i915/display/intel_display.c

@@ -17957,6 +17957,8 @@ static int intel_initial_commit(struct drm_device *dev)
 		}
 
 		if (crtc_state->hw.active) {
+			struct intel_encoder *encoder;
+
 			/*
 			 * We've not yet detected sink capabilities
 			 * (audio,infoframes,etc.) and thus we don't want to
@@ -17978,22 +17980,15 @@ static int intel_initial_commit(struct drm_device *dev)
 			 */
 			crtc_state->uapi.color_mgmt_changed = true;
 
-			/*
-			 * FIXME hack to force full modeset when DSC is being
-			 * used.
-			 *
-			 * As long as we do not have full state readout and
-			 * config comparison of crtc_state->dsc, we have no way
-			 * to ensure reliable fastset. Remove once we have
-			 * readout for DSC.
-			 */
-			if (crtc_state->dsc.compression_enable) {
+			for_each_intel_encoder_mask(dev, encoder,
+						    crtc_state->uapi.encoder_mask) {
+				if (encoder->initial_fastset_check &&
+				    !encoder->initial_fastset_check(encoder, crtc_state)) {
 					ret = drm_atomic_add_affected_connectors(state,
 										 &crtc->base);
 					if (ret)
 						goto out;
-				crtc_state->uapi.mode_changed = true;
-				drm_dbg_kms(dev, "Force full modeset for DSC\n");
+				}
 			}
 		}
 	}

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -187,6 +187,14 @@ struct intel_encoder {
 	 * be set correctly before calling this function. */
 	void (*get_config)(struct intel_encoder *,
 			   struct intel_crtc_state *pipe_config);
+
+	/*
+	 * Optional hook, returning true if this encoder allows a fastset
+	 * during the initial commit, false otherwise.
+	 */
+	bool (*initial_fastset_check)(struct intel_encoder *encoder,
+				      struct intel_crtc_state *crtc_state);
+
 	/*
 	 * Acquires the power domains needed for an active encoder during
 	 * hardware state readout.

drivers/gpu/drm/i915/display/intel_dp.c

@@ -3703,6 +3703,27 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
 	}
 }
 
+bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
+				    struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	/*
+	 * FIXME hack to force full modeset when DSC is being used.
+	 *
+	 * As long as we do not have full state readout and config comparison
+	 * of crtc_state->dsc, we have no way to ensure reliable fastset.
+	 * Remove once we have readout for DSC.
+	 */
+	if (crtc_state->dsc.compression_enable) {
+		drm_dbg_kms(&i915->drm, "Forcing full modeset due to DSC being enabled\n");
+		crtc_state->uapi.mode_changed = true;
+		return false;
+	}
+
+	return true;
+}
+
 static void intel_disable_dp(struct intel_atomic_state *state,
 			     struct intel_encoder *encoder,
 			     const struct intel_crtc_state *old_crtc_state,
@@ -8057,6 +8078,7 @@ bool intel_dp_init(struct drm_i915_private *dev_priv,
 	intel_encoder->compute_config = intel_dp_compute_config;
 	intel_encoder->get_hw_state = intel_dp_get_hw_state;
 	intel_encoder->get_config = intel_dp_get_config;
+	intel_encoder->initial_fastset_check = intel_dp_initial_fastset_check;
 	intel_encoder->update_pipe = intel_panel_update_backlight;
 	intel_encoder->suspend = intel_dp_encoder_suspend;
 	if (IS_CHERRYVIEW(dev_priv)) {

drivers/gpu/drm/i915/display/intel_dp.h

@@ -141,4 +141,7 @@ void intel_ddi_update_pipe(struct intel_atomic_state *state,
 int intel_dp_init_hdcp(struct intel_digital_port *dig_port,
 		       struct intel_connector *intel_connector);
 
+bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
+				    struct intel_crtc_state *crtc_state);
+
 #endif /* __INTEL_DP_H__ */

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -591,6 +591,15 @@ static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
 	intel_ddi_get_config(&dig_port->base, pipe_config);
 }
 
+static bool intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder,
+					       struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+	struct intel_digital_port *dig_port = intel_mst->primary;
+
+	return intel_dp_initial_fastset_check(&dig_port->base, crtc_state);
+}
+
 static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
@@ -897,6 +906,7 @@ intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe
 	intel_encoder->enable = intel_mst_enable_dp;
 	intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
 	intel_encoder->get_config = intel_dp_mst_enc_get_config;
+	intel_encoder->initial_fastset_check = intel_dp_mst_initial_fastset_check;
 
 	return intel_mst;