drm/msm/dp: stop parsing clock names from DT

All supported platforms use the same clocks configuration. Instead of
parsing names from DT in a pretty complex manner, use the static
configuration. If at some point newer (or older) platforms have
different clock configuration, this clock config can be moved to the
device data.
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/576115/
Link: https://lore.kernel.org/r/20240126-dp-power-parser-cleanup-v3-7-098d5f581dd3@linaro.org

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

@@ -69,6 +69,11 @@ struct dp_vc_tu_mapping_table {
 	u8 tu_size_minus1;
 };
 
+struct dss_module_power {
+	unsigned int num_clk;
+	struct clk_bulk_data *clocks;
+};
+
 struct dp_ctrl_private {
 	struct dp_ctrl dp_ctrl;
 	struct drm_device *drm_dev;
@@ -79,6 +84,7 @@ struct dp_ctrl_private {
 	struct dp_parser *parser;
 	struct dp_catalog *catalog;
 
+	struct dss_module_power mp[DP_MAX_PM];
 	struct clk *pixel_clk;
 
 	struct completion idle_comp;
@@ -90,6 +96,15 @@ struct dp_ctrl_private {
 	bool stream_clks_on;
 };
 
+static inline const char *dp_pm_name(enum dp_pm_type module)
+{
+	switch (module) {
+	case DP_CORE_PM:	return "DP_CORE_PM";
+	case DP_CTRL_PM:	return "DP_CTRL_PM";
+	default:		return "???";
+	}
+}
+
 static int dp_aux_link_configure(struct drm_dp_aux *aux,
 					struct dp_link_info *link)
 {
@@ -1329,7 +1344,7 @@ int dp_ctrl_clk_enable(struct dp_ctrl *dp_ctrl,
 	if (pm_type != DP_CORE_PM &&
 	    pm_type != DP_CTRL_PM) {
 		DRM_ERROR("unsupported ctrl module: %s\n",
-			  dp_parser_pm_name(pm_type));
+			  dp_pm_name(pm_type));
 		return -EINVAL;
 	}
 
@@ -1349,7 +1364,7 @@ int dp_ctrl_clk_enable(struct dp_ctrl *dp_ctrl,
 		if ((pm_type == DP_CTRL_PM) && (!ctrl->core_clks_on)) {
 			drm_dbg_dp(ctrl->drm_dev,
 				   "Enable core clks before link clks\n");
-			mp = &ctrl->parser->mp[DP_CORE_PM];
+			mp = &ctrl->mp[DP_CORE_PM];
 
 			ret = clk_bulk_prepare_enable(mp->num_clk, mp->clocks);
 			if (ret)
@@ -1359,7 +1374,7 @@ int dp_ctrl_clk_enable(struct dp_ctrl *dp_ctrl,
 		}
 	}
 
-	mp = &ctrl->parser->mp[pm_type];
+	mp = &ctrl->mp[pm_type];
 	if (enable) {
 		ret = clk_bulk_prepare_enable(mp->num_clk, mp->clocks);
 		if (ret)
@@ -1375,7 +1390,7 @@ int dp_ctrl_clk_enable(struct dp_ctrl *dp_ctrl,
 
 	drm_dbg_dp(ctrl->drm_dev, "%s clocks for %s\n",
 		   enable ? "enable" : "disable",
-		   dp_parser_pm_name(pm_type));
+		   dp_pm_name(pm_type));
 	drm_dbg_dp(ctrl->drm_dev,
 		   "stream_clks:%s link_clks:%s core_clks:%s\n",
 		   ctrl->stream_clks_on ? "on" : "off",
@@ -2153,30 +2168,56 @@ irqreturn_t dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
 	return ret;
 }
 
+static const char *core_clks[] = {
+	"core_iface",
+	"core_aux",
+};
+
+static const char *ctrl_clks[] = {
+	"ctrl_link",
+	"ctrl_link_iface",
+};
+
 static int dp_ctrl_clk_init(struct dp_ctrl *dp_ctrl)
 {
-	struct dp_ctrl_private *ctrl_private;
-	int rc = 0;
-	struct dss_module_power *core, *ctrl;
+	struct dp_ctrl_private *ctrl;
+	struct dss_module_power *core, *link;
 	struct device *dev;
+	int i, rc;
+
+	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
+	dev = ctrl->dev;
 
-	ctrl_private = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
-	dev = ctrl_private->dev;
+	core = &ctrl->mp[DP_CORE_PM];
+	link = &ctrl->mp[DP_CTRL_PM];
 
-	core = &ctrl_private->parser->mp[DP_CORE_PM];
-	ctrl = &ctrl_private->parser->mp[DP_CTRL_PM];
+	core->num_clk = ARRAY_SIZE(core_clks);
+	core->clocks = devm_kcalloc(dev, core->num_clk, sizeof(*core->clocks), GFP_KERNEL);
+	if (!core->clocks)
+		return -ENOMEM;
+
+	for (i = 0; i < core->num_clk; i++)
+		core->clocks[i].id = core_clks[i];
 
 	rc = devm_clk_bulk_get(dev, core->num_clk, core->clocks);
 	if (rc)
 		return rc;
 
-	rc = devm_clk_bulk_get(dev, ctrl->num_clk, ctrl->clocks);
+	link->num_clk = ARRAY_SIZE(ctrl_clks);
+	link->clocks = devm_kcalloc(dev, link->num_clk, sizeof(*link->clocks), GFP_KERNEL);
+	if (!link->clocks)
+		return -ENOMEM;
+
+	for (i = 0; i < link->num_clk; i++)
+		link->clocks[i].id = ctrl_clks[i];
+
+	rc = devm_clk_bulk_get(dev, link->num_clk, link->clocks);
 	if (rc)
-		return -ENODEV;
+		return rc;
 
-	ctrl_private->pixel_clk = devm_clk_get(dev, "stream_pixel");
-	if (IS_ERR(ctrl_private->pixel_clk))
-		return PTR_ERR(ctrl_private->pixel_clk);
+	ctrl->pixel_clk = devm_clk_get(dev, "stream_pixel");
+	if (IS_ERR(ctrl->pixel_clk))
+		return PTR_ERR(ctrl->pixel_clk);
 
 	return 0;
 }

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

@@ -17,6 +17,12 @@ struct dp_ctrl {
 	bool wide_bus_en;
 };
 
+enum dp_pm_type {
+	DP_CORE_PM,
+	DP_CTRL_PM,
+	DP_MAX_PM
+};
+
 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
 int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool force_link_train);
 int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl);

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

@@ -141,114 +141,6 @@ static int dp_parser_misc(struct dp_parser *parser)
 	return 0;
 }
 
-static inline bool dp_parser_check_prefix(const char *clk_prefix,
-						const char *clk_name)
-{
-	return !strncmp(clk_prefix, clk_name, strlen(clk_prefix));
-}
-
-static int dp_parser_init_clk_data(struct dp_parser *parser)
-{
-	int num_clk, i, rc;
-	int core_clk_count = 0, ctrl_clk_count = 0;
-	const char *clk_name;
-	struct device *dev = &parser->pdev->dev;
-	struct dss_module_power *core_power = &parser->mp[DP_CORE_PM];
-	struct dss_module_power *ctrl_power = &parser->mp[DP_CTRL_PM];
-
-	num_clk = of_property_count_strings(dev->of_node, "clock-names");
-	if (num_clk <= 0) {
-		DRM_ERROR("no clocks are defined\n");
-		return -EINVAL;
-	}
-
-	for (i = 0; i < num_clk; i++) {
-		rc = of_property_read_string_index(dev->of_node,
-				"clock-names", i, &clk_name);
-		if (rc < 0)
-			return rc;
-
-		if (dp_parser_check_prefix("core", clk_name))
-			core_clk_count++;
-
-		if (dp_parser_check_prefix("ctrl", clk_name))
-			ctrl_clk_count++;
-	}
-
-	/* Initialize the CORE power module */
-	if (core_clk_count == 0) {
-		DRM_ERROR("no core clocks are defined\n");
-		return -EINVAL;
-	}
-
-	core_power->num_clk = core_clk_count;
-	core_power->clocks = devm_kcalloc(dev,
-			core_power->num_clk, sizeof(struct clk_bulk_data),
-			GFP_KERNEL);
-	if (!core_power->clocks)
-		return -ENOMEM;
-
-	/* Initialize the CTRL power module */
-	if (ctrl_clk_count == 0) {
-		DRM_ERROR("no ctrl clocks are defined\n");
-		return -EINVAL;
-	}
-
-	ctrl_power->num_clk = ctrl_clk_count;
-	ctrl_power->clocks = devm_kcalloc(dev,
-			ctrl_power->num_clk, sizeof(struct clk_bulk_data),
-			GFP_KERNEL);
-	if (!ctrl_power->clocks) {
-		ctrl_power->num_clk = 0;
-		return -ENOMEM;
-	}
-
-	return num_clk;
-}
-
-static int dp_parser_clock(struct dp_parser *parser)
-{
-	int rc = 0, i = 0;
-	int num_clk = 0;
-	int core_clk_index = 0, ctrl_clk_index = 0;
-	int core_clk_count = 0, ctrl_clk_count = 0;
-	const char *clk_name;
-	struct device *dev = &parser->pdev->dev;
-	struct dss_module_power *core_power = &parser->mp[DP_CORE_PM];
-	struct dss_module_power *ctrl_power = &parser->mp[DP_CTRL_PM];
-
-	rc =  dp_parser_init_clk_data(parser);
-	if (rc < 0) {
-		DRM_ERROR("failed to initialize power data %d\n", rc);
-		return rc;
-	}
-
-	num_clk = rc;
-
-	core_clk_count = core_power->num_clk;
-	ctrl_clk_count = ctrl_power->num_clk;
-
-	for (i = 0; i < num_clk; i++) {
-		rc = of_property_read_string_index(dev->of_node, "clock-names",
-				i, &clk_name);
-		if (rc) {
-			DRM_ERROR("error reading clock-names %d\n", rc);
-			return rc;
-		}
-		if (dp_parser_check_prefix("core", clk_name) &&
-				core_clk_index < core_clk_count) {
-			core_power->clocks[core_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
-			core_clk_index++;
-		} else if (dp_parser_check_prefix("ctrl", clk_name) &&
-			   ctrl_clk_index < ctrl_clk_count) {
-			ctrl_power->clocks[ctrl_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
-			ctrl_clk_index++;
-		}
-	}
-
-	return 0;
-}
-
 int devm_dp_parser_find_next_bridge(struct device *dev, struct dp_parser *parser)
 {
 	struct platform_device *pdev = parser->pdev;
@@ -280,10 +172,6 @@ static int dp_parser_parse(struct dp_parser *parser)
 	if (rc)
 		return rc;
 
-	rc = dp_parser_clock(parser);
-	if (rc)
-		return rc;
-
 	return 0;
 }
 

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

@@ -16,12 +16,6 @@
 #define DP_MAX_NUM_DP_LANES	4
 #define DP_LINK_RATE_HBR2	540000 /* kbytes */
 
-enum dp_pm_type {
-	DP_CORE_PM,
-	DP_CTRL_PM,
-	DP_MAX_PM
-};
-
 struct dss_io_region {
 	size_t len;
 	void __iomem *base;
@@ -34,15 +28,6 @@ struct dss_io_data {
 	struct dss_io_region p0;
 };
 
-static inline const char *dp_parser_pm_name(enum dp_pm_type module)
-{
-	switch (module) {
-	case DP_CORE_PM:	return "DP_CORE_PM";
-	case DP_CTRL_PM:	return "DP_CTRL_PM";
-	default:		return "???";
-	}
-}
-
 /**
  * struct dp_ctrl_resource - controller's IO related data
  *
@@ -55,20 +40,13 @@ struct dp_io {
 	union phy_configure_opts phy_opts;
 };
 
-struct dss_module_power {
-	unsigned int num_clk;
-	struct clk_bulk_data *clocks;
-};
-
 /**
  * struct dp_parser - DP parser's data exposed to clients
  *
  * @pdev: platform data of the client
- * @mp: gpio, regulator and clock related data
  */
 struct dp_parser {
 	struct platform_device *pdev;
-	struct dss_module_power mp[DP_MAX_PM];
 	struct dp_io io;
 	u32 max_dp_lanes;
 	u32 max_dp_link_rate;