drm/msm/dp: move link property handling to dp_panel

Instead of passing link properties through the separate struct, parse
them directly in the dp_panel.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/576117/
Link: https://lore.kernel.org/r/20240126-dp-power-parser-cleanup-v3-13-098d5f581dd3@linaro.org

drivers/gpu/drm/msm/dp/dp_display.c

@@ -357,12 +357,6 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
 	int rc = 0;
 	struct edid *edid;
 
-	dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
-	dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
-
-	drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
-		dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
-
 	rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
 	if (rc)
 		goto end;
@@ -382,8 +376,6 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
 	dp->audio_supported = drm_detect_monitor_audio(edid);
 	dp_panel_handle_sink_request(dp->panel);
 
-	dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
-
 	/*
 	 * set sink to normal operation mode -- D0
 	 * before dpcd read

drivers/gpu/drm/msm/dp/dp_display.h

@@ -28,7 +28,6 @@ struct msm_dp {
 
 	bool wide_bus_en;
 
-	u32 max_dp_lanes;
 	struct dp_audio *dp_audio;
 	bool psr_supported;
 };

drivers/gpu/drm/msm/dp/dp_panel.c

@@ -7,8 +7,12 @@
 
 #include <drm/drm_connector.h>
 #include <drm/drm_edid.h>
+#include <drm/drm_of.h>
 #include <drm/drm_print.h>
 
+#define DP_MAX_NUM_DP_LANES	4
+#define DP_LINK_RATE_HBR2	540000 /* kbytes */
+
 struct dp_panel_private {
 	struct device *dev;
 	struct drm_device *drm_dev;
@@ -138,6 +142,9 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
 
 	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
 
+	drm_dbg_dp(panel->drm_dev, "max_lanes=%d max_link_rate=%d\n",
+		dp_panel->max_dp_lanes, dp_panel->max_dp_link_rate);
+
 	rc = dp_panel_read_dpcd(dp_panel);
 	if (rc) {
 		DRM_ERROR("read dpcd failed %d\n", rc);
@@ -386,10 +393,65 @@ int dp_panel_init_panel_info(struct dp_panel *dp_panel)
 	return 0;
 }
 
+static u32 dp_panel_link_frequencies(struct device_node *of_node)
+{
+	struct device_node *endpoint;
+	u64 frequency = 0;
+	int cnt;
+
+	endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+	if (!endpoint)
+		return 0;
+
+	cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
+
+	if (cnt > 0)
+		of_property_read_u64_index(endpoint, "link-frequencies",
+						cnt - 1, &frequency);
+	of_node_put(endpoint);
+
+	do_div(frequency,
+		10 * /* from symbol rate to link rate */
+		1000); /* kbytes */
+
+	return frequency;
+}
+
+static int dp_panel_parse_dt(struct dp_panel *dp_panel)
+{
+	struct dp_panel_private *panel;
+	struct device_node *of_node;
+	int cnt;
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+	of_node = panel->dev->of_node;
+
+	/*
+	 * data-lanes is the property of dp_out endpoint
+	 */
+	cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES);
+	if (cnt < 0) {
+		/* legacy code, data-lanes is the property of mdss_dp node */
+		cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
+	}
+
+	if (cnt > 0)
+		dp_panel->max_dp_lanes = cnt;
+	else
+		dp_panel->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
+
+	dp_panel->max_dp_link_rate = dp_panel_link_frequencies(of_node);
+	if (!dp_panel->max_dp_link_rate)
+		dp_panel->max_dp_link_rate = DP_LINK_RATE_HBR2;
+
+	return 0;
+}
+
 struct dp_panel *dp_panel_get(struct dp_panel_in *in)
 {
 	struct dp_panel_private *panel;
 	struct dp_panel *dp_panel;
+	int ret;
 
 	if (!in->dev || !in->catalog || !in->aux || !in->link) {
 		DRM_ERROR("invalid input\n");
@@ -408,6 +470,10 @@ struct dp_panel *dp_panel_get(struct dp_panel_in *in)
 	dp_panel = &panel->dp_panel;
 	dp_panel->max_bw_code = DP_LINK_BW_8_1;
 
+	ret = dp_panel_parse_dt(dp_panel);
+	if (ret)
+		return ERR_PTR(ret);
+
 	return dp_panel;
 }
 

drivers/gpu/drm/msm/dp/dp_parser.c

@@ -24,56 +24,6 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
 	return 0;
 }
 
-static u32 dp_parser_link_frequencies(struct device_node *of_node)
-{
-	struct device_node *endpoint;
-	u64 frequency = 0;
-	int cnt;
-
-	endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
-	if (!endpoint)
-		return 0;
-
-	cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
-
-	if (cnt > 0)
-		of_property_read_u64_index(endpoint, "link-frequencies",
-						cnt - 1, &frequency);
-	of_node_put(endpoint);
-
-	do_div(frequency,
-		10 * /* from symbol rate to link rate */
-		1000); /* kbytes */
-
-	return frequency;
-}
-
-static int dp_parser_misc(struct dp_parser *parser)
-{
-	struct device_node *of_node = parser->pdev->dev.of_node;
-	int cnt;
-
-	/*
-	 * data-lanes is the property of dp_out endpoint
-	 */
-	cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES);
-	if (cnt < 0) {
-		/* legacy code, data-lanes is the property of mdss_dp node */
-		cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
-	}
-
-	if (cnt > 0)
-		parser->max_dp_lanes = cnt;
-	else
-		parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
-
-	parser->max_dp_link_rate = dp_parser_link_frequencies(of_node);
-	if (!parser->max_dp_link_rate)
-		parser->max_dp_link_rate = DP_LINK_RATE_HBR2;
-
-	return 0;
-}
-
 int devm_dp_parser_find_next_bridge(struct device *dev, struct dp_parser *parser)
 {
 	struct platform_device *pdev = parser->pdev;
@@ -101,10 +51,6 @@ static int dp_parser_parse(struct dp_parser *parser)
 	if (rc)
 		return rc;
 
-	rc = dp_parser_misc(parser);
-	if (rc)
-		return rc;
-
 	return 0;
 }
 

drivers/gpu/drm/msm/dp/dp_parser.h

@@ -11,8 +11,6 @@
 #include "msm_drv.h"
 
 #define DP_MAX_PIXEL_CLK_KHZ	675000
-#define DP_MAX_NUM_DP_LANES	4
-#define DP_LINK_RATE_HBR2	540000 /* kbytes */
 
 /**
  * struct dp_parser - DP parser's data exposed to clients
@@ -23,8 +21,6 @@
 struct dp_parser {
 	struct platform_device *pdev;
 	struct phy *phy;
-	u32 max_dp_lanes;
-	u32 max_dp_link_rate;
 	struct drm_bridge *next_bridge;
 };