[PATCH v1 2/2] [media] mtk-mdp: use pm_runtime in MDP component driver

[Eizan Miyamoto <eizan@chromium.org>]

Without this change, the MDP components are not fully integrated into
the runtime power management subsystem, and the MDP driver does not
work.

For each of the component device drivers to be able to call
pm_runtime_get/put_sync() a pointer to the component's device struct
had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init().

Note that the dev argument to mtk_mdp_comp_clock_on/off() has been
removed. Those functions used to be called from the "master" mdp driver
in mtk_mdp_core.c, but the component's device pointer no longer
corresponds to the mdp master device pointer, which is not the right
device to pass to pm_runtime_put/get_sync() which we had to add to get
the driver to work properly.

Signed-off-by: eizan@chromium.org
Signed-off-by: Eizan Miyamoto <eizan@google.com>
---

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 22 ++++++++++++++-----
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  6 +++--
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c |  6 ++---
 3 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 4c77a582c79a..6716baaf8788 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -15,6 +15,7 @@
 #include <linux/of_platform.h>
 #include <soc/mediatek/smi.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 
 #include "mtk_mdp_comp.h"
 #include "mtk_mdp_core.h"
@@ -52,7 +53,7 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
-void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
+void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
 {
 	int i, err;
 
@@ -61,25 +62,31 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
 		if (err) {
 			enum mtk_mdp_comp_type comp_type =
 				(enum mtk_mdp_comp_type)
-				of_device_get_match_data(dev);
-			dev_err(dev,
+				of_device_get_match_data(comp->dev);
+			dev_err(comp->dev,
 				"failed to get larb, err %d. type:%d\n",
 				err, comp_type);
 		}
 	}
 
+	err = pm_runtime_get_sync(comp->dev);
+	if (err < 0)
+		dev_err(comp->dev,
+			"failed to runtime get, err %d.\n",
+			err);
+
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		if (IS_ERR(comp->clk[i]))
 			continue;
 		err = clk_prepare_enable(comp->clk[i]);
 		if (err)
-			dev_err(dev,
+			dev_err(comp->dev,
 				"failed to enable clock, err %d. i:%d\n",
 				err, i);
 	}
 }
 
-void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
+void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
 {
 	int i;
 
@@ -91,6 +98,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
 
 	if (comp->larb_dev)
 		mtk_smi_larb_put(comp->larb_dev);
+
+	pm_runtime_put_sync(comp->dev);
 }
 
 static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
@@ -100,6 +109,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master,
 	struct mtk_mdp_dev *mdp = data;
 
 	mtk_mdp_register_component(mdp, comp);
+	pm_runtime_enable(dev);
 
 	return 0;
 }
@@ -110,6 +120,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master,
 	struct mtk_mdp_dev *mdp = data;
 	struct mtk_mdp_comp *comp = dev_get_drvdata(dev);
 
+	pm_runtime_disable(dev);
 	mtk_mdp_unregister_component(mdp, comp);
 }
 
@@ -128,6 +139,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev)
 		 (enum mtk_mdp_comp_type)of_device_get_match_data(dev);
 
 	INIT_LIST_HEAD(&comp->node);
+	comp->dev = dev;
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		comp->clk[i] = of_clk_get(node, i);
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index edc2ece717b5..91407150ac9e 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -12,18 +12,20 @@
  * @node:	list node to track sibing MDP components
  * @clk:	clocks required for component
  * @larb_dev:	SMI device required for component
+ * @dev:	component's device
  */
 struct mtk_mdp_comp {
 	struct list_head	node;
 	struct clk		*clk[2];
 	struct device		*larb_dev;
+	struct device		*dev;
 };
 
 int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
 void mtk_mdp_comp_deinit(struct mtk_mdp_comp *comp);
 
-void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
-void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
 
 extern struct platform_driver mtk_mdp_component_driver;
 
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index fe8ae4ad0d3e..33c68133e2eb 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
 
 static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 {
-	struct device *dev = &mdp->pdev->dev;
 	struct mtk_mdp_comp *comp_node;
 
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_on(dev, comp_node);
+		mtk_mdp_comp_clock_on(comp_node);
 }
 
 static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 {
-	struct device *dev = &mdp->pdev->dev;
 	struct mtk_mdp_comp *comp_node;
 
 	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_clock_off(dev, comp_node);
+		mtk_mdp_comp_clock_off(comp_node);
 }
 
 static void mtk_mdp_wdt_worker(struct work_struct *work)
-- 
2.26.2.526.g744177e7f7-goog


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