drm/msm/dp: add opp_table corner voting support base on dp_ink_clk rate

Set link rate by using OPP set rate api so that CX level will be set
accordingly based on the link rate.

Changes in v2:
-- remove dev from dp_ctrl_put() parameters
-- Add more information to commit message

Changes in v3:
-- return when dev_pm_opp_set_clkname() failed
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

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

@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 #include <linux/phy/phy.h>
 #include <linux/phy/phy-dp.h>
+#include <linux/pm_opp.h>
 #include <drm/drm_fixed.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_print.h>
@@ -76,6 +77,8 @@ struct dp_ctrl_private {
 	struct dp_parser *parser;
 	struct dp_catalog *catalog;
 
+	struct opp_table *opp_table;
+
 	struct completion idle_comp;
 	struct completion video_comp;
 };
@@ -1833,6 +1836,7 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
 			struct dp_parser *parser)
 {
 	struct dp_ctrl_private *ctrl;
+	int ret;
 
 	if (!dev || !panel || !aux ||
 	    !link || !catalog) {
@@ -1846,6 +1850,21 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
 		return ERR_PTR(-ENOMEM);
 	}
 
+	ctrl->opp_table = dev_pm_opp_set_clkname(dev, "ctrl_link");
+	if (IS_ERR(ctrl->opp_table)) {
+		dev_err(dev, "invalid DP OPP table in device tree\n");
+		/* caller do PTR_ERR(ctrl->opp_table) */
+		return (struct dp_ctrl *)ctrl->opp_table;
+	}
+
+	/* OPP table is optional */
+	ret = dev_pm_opp_of_add_table(dev);
+	if (ret) {
+		dev_err(dev, "failed to add DP OPP table\n");
+		dev_pm_opp_put_clkname(ctrl->opp_table);
+		ctrl->opp_table = NULL;
+	}
+
 	init_completion(&ctrl->idle_comp);
 	init_completion(&ctrl->video_comp);
 
@@ -1863,4 +1882,13 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
 
 void dp_ctrl_put(struct dp_ctrl *dp_ctrl)
 {
+	struct dp_ctrl_private *ctrl;
+
+	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
+
+	if (ctrl->opp_table) {
+		dev_pm_opp_of_remove_table(ctrl->dev);
+		dev_pm_opp_put_clkname(ctrl->opp_table);
+		ctrl->opp_table = NULL;
+	}
 }

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

@@ -699,7 +699,7 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
 		goto error;
 	}
 
-	dp->power = dp_power_get(dp->parser);
+	dp->power = dp_power_get(dev, dp->parser);
 	if (IS_ERR(dp->power)) {
 		rc = PTR_ERR(dp->power);
 		DRM_ERROR("failed to initialize power, rc = %d\n", rc);

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

@@ -8,12 +8,14 @@
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/regulator/consumer.h>
+#include <linux/pm_opp.h>
 #include "dp_power.h"
 #include "msm_drv.h"
 
 struct dp_power_private {
 	struct dp_parser *parser;
 	struct platform_device *pdev;
+	struct device *dev;
 	struct clk *link_clk_src;
 	struct clk *pixel_provider;
 	struct clk *link_provider;
@@ -148,18 +150,51 @@ static int dp_power_clk_deinit(struct dp_power_private *power)
 	return 0;
 }
 
+static int dp_power_clk_set_link_rate(struct dp_power_private *power,
+			struct dss_clk *clk_arry, int num_clk, int enable)
+{
+	u32 rate;
+	int i, rc = 0;
+
+	for (i = 0; i < num_clk; i++) {
+		if (clk_arry[i].clk) {
+			if (clk_arry[i].type == DSS_CLK_PCLK) {
+				if (enable)
+					rate = clk_arry[i].rate;
+				else
+					rate = 0;
+
+				rc = dev_pm_opp_set_rate(power->dev, rate);
+				if (rc)
+					break;
+			}
+
+		}
+	}
+	return rc;
+}
+
 static int dp_power_clk_set_rate(struct dp_power_private *power,
 		enum dp_pm_type module, bool enable)
 {
 	int rc = 0;
 	struct dss_module_power *mp = &power->parser->mp[module];
 
-	if (enable) {
-		rc = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
+	if (module == DP_CTRL_PM) {
+		rc = dp_power_clk_set_link_rate(power, mp->clk_config, mp->num_clk, enable);
 		if (rc) {
-			DRM_ERROR("failed to set clks rate.\n");
+			DRM_ERROR("failed to set link clks rate\n");
 			return rc;
 		}
+	} else {
+
+		if (enable) {
+			rc = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
+			if (rc) {
+				DRM_ERROR("failed to set clks rate\n");
+				return rc;
+			}
+		}
 	}
 
 	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, enable);
@@ -349,7 +384,7 @@ int dp_power_deinit(struct dp_power *dp_power)
 	return 0;
 }
 
-struct dp_power *dp_power_get(struct dp_parser *parser)
+struct dp_power *dp_power_get(struct device *dev, struct dp_parser *parser)
 {
 	struct dp_power_private *power;
 	struct dp_power *dp_power;
@@ -365,6 +400,7 @@ struct dp_power *dp_power_get(struct dp_parser *parser)
 
 	power->parser = parser;
 	power->pdev = parser->pdev;
+	power->dev = dev;
 
 	dp_power = &power->dp_power;
 

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

@@ -102,6 +102,6 @@ void dp_power_client_deinit(struct dp_power *power);
  * methods to be called by the client to configure the power related
  * modueles.
  */
-struct dp_power *dp_power_get(struct dp_parser *parser);
+struct dp_power *dp_power_get(struct device *dev, struct dp_parser *parser);
 
 #endif /* _DP_POWER_H_ */