Commit 401411bb authored by Artur Petrosyan's avatar Artur Petrosyan Committed by Greg Kroah-Hartman
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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: default avatarArtur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073731.3C81BA022E@mailhost.synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ef5e0eec

drivers/usb/dwc2/platform.c

+9 −0
Original line number Diff line number Diff line
@@ -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);