[PATCH v3 14/14] usb: dwc2: Add exit partial power down before removing driver

[Artur Petrosyan]

When dwc2 core is in partial power down mode
loading driver again causes driver fail. Because in
that mode registers are not accessible.

Added a flow of exiting the partial power down mode
to avoid the driver reload failure.

Signed-off-by: Artur Petrosyan <arthur.petros...@synopsys.com>
---
 Changes in v3:
 - None
 Changes in v2:
 - None

 drivers/usb/dwc2/platform.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 5f18acac7406..b28b8cd45799 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -316,6 +316,15 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 static int dwc2_driver_remove(struct platform_device *dev)
 {
        struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
+       int ret = 0;
+
+       /* Exit Partial Power Down when driver is removed. */
+       if (hsotg->in_ppd) {
+               ret = dwc2_exit_partial_power_down(hsotg, 0, true);
+               if (ret)
+                       dev_err(hsotg->dev,
+                               "exit partial_power_down failed\n");
+       }
 
        dwc2_debugfs_exit(hsotg);
        if (hsotg->hcd_enabled)
@@ -334,7 +343,7 @@ static int dwc2_driver_remove(struct platform_device *dev)
        reset_control_assert(hsotg->reset);
        reset_control_assert(hsotg->reset_ecc);
 
-       return 0;
+       return ret;
 }
 
 /**
-- 
2.25.1