[PATCH 16/51] phy: omap-usb2: support suspend/resume

Kishon Vijay Abraham I
2016-09-14T07:53:27Z

From: Sekhar Nori <nsekhar@ti.com>

Relying on PM-ops for shutting down PHY clocks was a
bad idea since the users (e.g. USB DWC3) might not
have been suspended by then.

Get rid of all PM-ops. It is the sole responsibility
of the PHY user to properly turn OFF and de-initialize
the PHY as part of its suspend routine.

Enable/disable PHY clock as part of ->init()/->exit()
call respectively. With this phy_init() and phy_exit()
can be called by PHY user during suspend/resume.

This is similar to what is done for ti-pipe3 driver.
See 31c8954efb1b ("phy: ti-pipe3: fix suspend")

The pm_runtime_enable() call in omap_usb2_probe()
is still required because without it, phy_create()
will not enable runtime PM on the phy device it
creates and phy_init() will not call
pm_runtime_get_sync().

Without pm_runtime_get_sync(), ocp2scp hwmod will
_not_ enable the IP and, thus, we will have abort
exceptions.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/phy/phy-omap-usb2.c | 100 ++++++++++++++++++++-----------------------
1 file changed, 46 insertions(+), 54 deletions(-)

diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index c134989..fe909fd 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -133,11 +133,49 @@ static int omap_usb_power_on(struct phy *x)
return omap_usb_phy_power(phy, true);
}

+static int omap_usb2_disable_clocks(struct omap_usb *phy)
+{
+ clk_disable(phy->wkupclk);
+ if (!IS_ERR(phy->optclk))
+ clk_disable(phy->optclk);
+
+ return 0;
+}
+
+static int omap_usb2_enable_clocks(struct omap_usb *phy)
+{
+ int ret;
+
+ ret = clk_enable(phy->wkupclk);
+ if (ret < 0) {
+ dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
+ goto err0;
+ }
+
+ if (!IS_ERR(phy->optclk)) {
+ ret = clk_enable(phy->optclk);
+ if (ret < 0) {
+ dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
+ goto err1;
+ }
+ }
+
+ return 0;
+
+err1:
+ clk_disable(phy->wkupclk);
+
+err0:
+ return ret;
+}
+
static int omap_usb_init(struct phy *x)
{
struct omap_usb *phy = phy_get_drvdata(x);
u32 val;

+ omap_usb2_enable_clocks(phy);
+
if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
/*
*
@@ -155,8 +193,16 @@ static int omap_usb_init(struct phy *x)
return 0;
}

+static int omap_usb_exit(struct phy *x)
+{
+ struct omap_usb *phy = phy_get_drvdata(x);
+
+ return omap_usb2_disable_clocks(phy);
+}
+
static const struct phy_ops ops = {
.init = omap_usb_init,
+ .exit = omap_usb_exit,
.power_on = omap_usb_power_on,
.power_off = omap_usb_power_off,
.owner = THIS_MODULE,
@@ -376,65 +422,11 @@ static int omap_usb2_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_PM
-
-static int omap_usb2_runtime_suspend(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct omap_usb *phy = platform_get_drvdata(pdev);
-
- clk_disable(phy->wkupclk);
- if (!IS_ERR(phy->optclk))
- clk_disable(phy->optclk);
-
- return 0;
-}
-
-static int omap_usb2_runtime_resume(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct omap_usb *phy = platform_get_drvdata(pdev);
- int ret;
-
- ret = clk_enable(phy->wkupclk);
- if (ret < 0) {
- dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
- goto err0;
- }
-
- if (!IS_ERR(phy->optclk)) {
- ret = clk_enable(phy->optclk);
- if (ret < 0) {
- dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
- goto err1;
- }
- }
-
- return 0;
-
-err1:
- clk_disable(phy->wkupclk);
-
-err0:
- return ret;
-}
-
-static const struct dev_pm_ops omap_usb2_pm_ops = {
- SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
- NULL)
-};
-
-#define DEV_PM_OPS (&omap_usb2_pm_ops)
-#else
-#define DEV_PM_OPS NULL
-#endif
-
static struct platform_driver omap_usb2_driver = {
.probe = omap_usb2_probe,
.remove = omap_usb2_remove,
.driver = {
.name = "omap-usb2",
- .pm = DEV_PM_OPS,
.of_match_table = omap_usb2_id_table,
},
};
--
1.7.9.5