[PATCH] phy: rcar-gen3-usb2: fix implementation for runtime PM

[Yoshihiro Shimoda]

This patch fixes an issue that this driver doesn't take care of the runtime
PM. This code assumed that devm_phy_create() called pm_runtime_enable(dev),
but it misunderstood the dev_phy_create()'s specification.
This driver should call the own pm_runtime_pm() before dev_phy_create().

Fixes: f3b5a8d9b50d ("phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
 drivers/phy/phy-rcar-gen3-usb2.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
index afb4d04..23c4e86 100644
--- a/drivers/phy/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/phy-rcar-gen3-usb2.c
@@ -20,6 +20,7 @@
 #include <linux/of_address.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/workqueue.h>
 
@@ -395,7 +396,7 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device 
*pdev)
        struct rcar_gen3_chan *channel;
        struct phy_provider *provider;
        struct resource *res;
-       int irq;
+       int irq, ret = 0;
 
        if (!dev->of_node) {
                dev_err(dev, "This driver needs device tree\n");
@@ -434,17 +435,24 @@ static int rcar_gen3_phy_usb2_probe(struct 
platform_device *pdev)
                }
        }
 
-       /* devm_phy_create() will call pm_runtime_enable(dev); */
+       /*
+        * devm_phy_create() will call pm_runtime_enable(&phy->dev);
+        * And then, phy-core will manage runtime pm for this device.
+        */
+       pm_runtime_enable(dev);
        channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
        if (IS_ERR(channel->phy)) {
                dev_err(dev, "Failed to create USB2 PHY\n");
-               return PTR_ERR(channel->phy);
+               ret = PTR_ERR(channel->phy);
+               goto error;
        }
 
        channel->vbus = devm_regulator_get_optional(dev, "vbus");
        if (IS_ERR(channel->vbus)) {
-               if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
-                       return PTR_ERR(channel->vbus);
+               if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
+                       ret = PTR_ERR(channel->vbus);
+                       goto error;
+               }
                channel->vbus = NULL;
        }
 
@@ -454,15 +462,22 @@ static int rcar_gen3_phy_usb2_probe(struct 
platform_device *pdev)
        provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
        if (IS_ERR(provider)) {
                dev_err(dev, "Failed to register PHY provider\n");
+               ret = PTR_ERR(provider);
+               goto error;
        } else if (channel->has_otg) {
                int ret;
 
                ret = device_create_file(dev, &dev_attr_role);
                if (ret < 0)
-                       return ret;
+                       goto error;
        }
 
        return PTR_ERR_OR_ZERO(provider);
+
+error:
+       pm_runtime_disable(dev);
+
+       return ret;
 }
 
 static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
@@ -472,6 +487,8 @@ static int rcar_gen3_phy_usb2_remove(struct platform_device 
*pdev)
        if (channel->has_otg)
                device_remove_file(&pdev->dev, &dev_attr_role);
 
+       pm_runtime_disable(&pdev->dev);
+
        return 0;
 };
 
-- 
1.9.1