Re: [PATCH] usb: host: xhci-rcar: Avoid long wait in xhci_reset()

[Felipe Balbi <felipe.balbi@linux.intel.com>]

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Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> writes:

> If kernel configuration is CONFIG_USB_XHCI_PLATFORM=y and
> CONFIG_USB_XHCI_RCAR is not set, R-Car Gen2/3 will cause long wait
> in xhci_reset() because such SoCs need specific initialization.

where is the delay coming from exactly ?

> So, this patch modifies the xhci_rcar_init_quirk() in xhci-rcar.h
> to exit the probe function immediately.
>
> Fixes: 4ac8918f3a7 (usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers)
> Cc: <stable@vger.kernel.org> # v3.17+
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> ---
>  drivers/usb/host/xhci-rcar.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/xhci-rcar.h b/drivers/usb/host/xhci-rcar.h
> index 2941a25..2afed68 100644
> --- a/drivers/usb/host/xhci-rcar.h
> +++ b/drivers/usb/host/xhci-rcar.h
> @@ -24,7 +24,11 @@ static inline void xhci_rcar_start(struct usb_hcd *hcd)
>  
>  static inline int xhci_rcar_init_quirk(struct usb_hcd *hcd)
>  {
> -	return 0;
> +	/*
> +	 * To avoid wait and timeout in xhci_reset() if CONFIG_XHCI_RCAR is
> +	 * disabled, this function fails.
> +	 */
> +	return -ENODEV;
>  }
>  #endif
>  #endif /* _XHCI_RCAR_H */
> -- 
> 1.9.1
>
> --
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-- 
balbi

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