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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: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073731.3C81BA022E@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Artur Petrosyan 2021-04-13 11:37:30 +04:00 committed by Greg Kroah-Hartman
parent ef5e0eec47
commit 401411bbc4
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/dwc2/platform.c
View File

@ -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);