On 4/8/2021 1:46 PM, Artur Petrosyan wrote:
> 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.
>
> Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
> ---
> Changes in v3:
> - None
> Changes in v2:
> - None
>
> drivers/usb/dwc2/platform.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index 5f18acac7406..b28b8cd45799 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -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;
> }
>
> /**
>
