From b46b1ef7b0da5c9257b98a0d1d658422e7851783 Mon Sep 17 00:00:00 2001 From: Artur Petrosyan Date: Thu, 8 Apr 2021 13:46:14 +0400 Subject: [PATCH] usb: dwc2: Add exit partial power down before removing driver 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. Acked-by: Minas Harutyunyan Signed-off-by: Artur Petrosyan Link: https://lore.kernel.org/r/20210408094615.8AE35A0094@mailhost.synopsys.com Signed-off-by: Greg Kroah-Hartman --- 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 5f18acac..b28b8cd 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; } /** -- 2.7.4