drm/i915/dp: Remove unused DSC caps from intel_dp

The previous patches converted all users of the DSC DPCD caps to look
these up from the connector, so remove the version stored in intel_dp.

A follow-up patchset will read out the MST connector specific
capabilities in intel_dp_add_mst_connector() ->
intel_dp_mst_read_decompression_port_dsc_caps().

v2:
- Rebased on intel_edp_get_dsc_sink_cap() addition in the patchset.
v3:
- Rebased on read-out fix for eDP in the patchset.

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> (v1)
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/20231011171606.2540078-3-imre.deak@intel.com

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

@@ -1725,10 +1725,8 @@ struct intel_dp {
 	u8 psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
 	u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
 	u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
-	u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE];
 	u8 lttpr_common_caps[DP_LTTPR_COMMON_CAP_SIZE];
 	u8 lttpr_phy_caps[DP_MAX_LTTPR_COUNT][DP_LTTPR_PHY_CAP_SIZE];
-	u8 fec_capable;
 	u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE];
 	/* source rates */
 	int num_source_rates;

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

@@ -3490,10 +3490,9 @@ static void intel_dp_read_dsc_dpcd(struct drm_dp_aux *aux,
 		    dsc_dpcd);
 }
 
-void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
-			       struct intel_connector *connector)
+void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_connector *connector)
 {
-	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	/*
 	 * Clear the cached register set to avoid using stale values
@@ -3518,27 +3517,14 @@ void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
 
 	drm_dbg_kms(&i915->drm, "FEC CAPABILITY: %x\n",
 		    connector->dp.fec_capability);
-
-	/*
-	 * TODO: remove the following intel_dp copies once all users
-	 * are converted to look up DSC DPCD/FEC capability via the
-	 * connector.
-	 */
-	memcpy(intel_dp->dsc_dpcd, connector->dp.dsc_dpcd,
-	       sizeof(intel_dp->dsc_dpcd));
-	intel_dp->fec_capable = connector->dp.fec_capability;
 }
 
-static void intel_edp_get_dsc_sink_cap(u8 edp_dpcd_rev, struct intel_dp *intel_dp,
-				       struct intel_connector *connector)
+static void intel_edp_get_dsc_sink_cap(u8 edp_dpcd_rev, struct intel_connector *connector)
 {
 	if (edp_dpcd_rev < DP_EDP_14)
 		return;
 
 	intel_dp_read_dsc_dpcd(connector->dp.dsc_decompression_aux, connector->dp.dsc_dpcd);
-
-	memcpy(intel_dp->dsc_dpcd, connector->dp.dsc_dpcd,
-	       sizeof(intel_dp->dsc_dpcd));
 }
 
 static void intel_edp_mso_mode_fixup(struct intel_connector *connector,
@@ -3710,7 +3696,6 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *connector
 	/* Read the eDP DSC DPCD registers */
 	if (HAS_DSC(dev_priv))
 		intel_edp_get_dsc_sink_cap(intel_dp->edp_dpcd[0],
-					   intel_dp,
 					   connector);
 
 	/*
@@ -5390,10 +5375,10 @@ intel_dp_detect_dsc_caps(struct intel_dp *intel_dp, struct intel_connector *conn
 
 	if (intel_dp_is_edp(intel_dp))
 		intel_edp_get_dsc_sink_cap(intel_dp->edp_dpcd[0],
-					   intel_dp, connector);
+					   connector);
 	else
 		intel_dp_get_dsc_sink_cap(intel_dp->dpcd[DP_DPCD_REV],
-					  intel_dp, connector);
+					  connector);
 }
 
 static int
@@ -5427,11 +5412,6 @@ intel_dp_detect(struct drm_connector *connector,
 
 	if (status == connector_status_disconnected) {
 		memset(&intel_dp->compliance, 0, sizeof(intel_dp->compliance));
-		/*
-		 * TODO: Remove clearing the DPCD in intel_dp, once all
-		 * user are converted to using the DPCD in connector.
-		 */
-		memset(intel_dp->dsc_dpcd, 0, sizeof(intel_dp->dsc_dpcd));
 		memset(intel_connector->dp.dsc_dpcd, 0, sizeof(intel_connector->dp.dsc_dpcd));
 
 		if (intel_dp->is_mst) {

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

@@ -163,7 +163,6 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
 					bool dsc,
 					struct link_config_limits *limits);
 
-void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
-			       struct intel_connector *connector);
+void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_connector *connector);
 
 #endif /* __INTEL_DP_H__ */

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

@@ -1136,7 +1136,7 @@ intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
 	if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
 		return;
 
-	intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], intel_dp, connector);
+	intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], connector);
 }
 
 static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,