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authorRoger Quadros <rogerq@ti.com>2020-05-25 10:10:48 +0300
committerFelipe Balbi <balbi@kernel.org>2020-05-25 11:10:07 +0300
commit1c11e74e9079289d8aaccc34b74cbf6463c0b791 (patch)
tree2c636a521a86cd360ed7999e9f4b4def6f16af0e /drivers/usb
parent15aeb360e4a0d144cb64e2adb6f71b444bafc238 (diff)
downloadlinux-1c11e74e9079289d8aaccc34b74cbf6463c0b791.tar.bz2
usb: dwc3: keystone: Turn on USB3 PHY before controller
The Local Power Sleep Controller (LPSC) dependency on AM65 requires SERDES0 to be powered on before USB. We need to power up SERDES0 power domain and hold it on throughout the reset, init, power on sequence. Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/dwc3/dwc3-keystone.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
index 1e14a6f4884b..6505f7bd69e2 100644
--- a/drivers/usb/dwc3/dwc3-keystone.c
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -14,6 +14,7 @@
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
/* USBSS register offsets */
@@ -34,6 +35,7 @@
struct dwc3_keystone {
struct device *dev;
void __iomem *usbss;
+ struct phy *usb3_phy;
};
static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
@@ -95,8 +97,38 @@ static int kdwc3_probe(struct platform_device *pdev)
if (IS_ERR(kdwc->usbss))
return PTR_ERR(kdwc->usbss);
- pm_runtime_enable(kdwc->dev);
+ /* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
+ kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
+ if (IS_ERR(kdwc->usb3_phy)) {
+ error = PTR_ERR(kdwc->usb3_phy);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get usb3 phy: %d\n", error);
+
+ return error;
+ }
+
+ phy_pm_runtime_get_sync(kdwc->usb3_phy);
+ error = phy_reset(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy reset failed: %d\n", error);
+ return error;
+ }
+
+ error = phy_init(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy init failed: %d\n", error);
+ return error;
+ }
+
+ error = phy_power_on(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy power on failed: %d\n", error);
+ phy_exit(kdwc->usb3_phy);
+ return error;
+ }
+
+ pm_runtime_enable(kdwc->dev);
error = pm_runtime_get_sync(kdwc->dev);
if (error < 0) {
dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
@@ -138,6 +170,9 @@ err_core:
err_irq:
pm_runtime_put_sync(kdwc->dev);
pm_runtime_disable(kdwc->dev);
+ phy_power_off(kdwc->usb3_phy);
+ phy_exit(kdwc->usb3_phy);
+ phy_pm_runtime_put_sync(kdwc->usb3_phy);
return error;
}
@@ -163,6 +198,10 @@ static int kdwc3_remove(struct platform_device *pdev)
pm_runtime_put_sync(kdwc->dev);
pm_runtime_disable(kdwc->dev);
+ phy_power_off(kdwc->usb3_phy);
+ phy_exit(kdwc->usb3_phy);
+ phy_pm_runtime_put_sync(kdwc->usb3_phy);
+
platform_set_drvdata(pdev, NULL);
return 0;