Commit b46b1ef7 authored by Artur Petrosyan's avatar Artur Petrosyan Committed by Greg Kroah-Hartman
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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: default avatarMinas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: default avatarArtur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210408094615.8AE35A0094@mailhost.synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c74c26f6

drivers/usb/dwc2/platform.c

+10 −1
Original line number Diff line number Diff line
@@ -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;

}



/**