[PATCH 12/12] usb: dwc2: Add exit clock gating before removing driver
From: Artur Petrosyan <hidden>
Date: 2021-04-13 07:17:50
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Subsystem:
designware usb2 drd ip driver, the rest, usb subsystem · Maintainers:
Minas Harutyunyan, Linus Torvalds, Greg Kroah-Hartman
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 <redacted> --- drivers/usb/dwc2/platform.c | 9 +++++++++ 1 file changed, 9 insertions(+)
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);
--
2.25.1