From 401411bbc4e62bcbcc020c2c458ecb90843140a8 Mon Sep 17 00:00:00 2001 From: Artur Petrosyan Date: Tue, 13 Apr 2021 11:37:30 +0400 Subject: usb: dwc2: Add exit clock gating before removing driver When dwc2 core is in clock gating mode loading driver again causes driver fail. Because in that mode registers are not accessible. Added a flow of exiting clock gating mode to avoid the driver reload failure. Signed-off-by: Artur Petrosyan Link: https://lore.kernel.org/r/20210413073731.3C81BA022E@mailhost.synopsys.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc2/platform.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/usb/dwc2/platform.c') diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index b28b8cd45799..f8b819cfa80e 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -326,6 +326,15 @@ static int dwc2_driver_remove(struct platform_device *dev) "exit partial_power_down failed\n"); } + /* Exit clock gating when driver is removed. */ + if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE && + hsotg->bus_suspended) { + if (dwc2_is_device_mode(hsotg)) + dwc2_gadget_exit_clock_gating(hsotg, 0); + else + dwc2_host_exit_clock_gating(hsotg, 0); + } + dwc2_debugfs_exit(hsotg); if (hsotg->hcd_enabled) dwc2_hcd_remove(hsotg); -- cgit v1.2.3