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>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 872b12689e317..7572264a71568 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/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;
+	}
 }