linux-kernel - Re: [PATCH v3] usb: ohci-at91: Fix the unhandle interrupt when resume

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Date:   Mon, 26 Jun 2023 12:08:46 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Guiting Shen <aarongt.shen@...il.com>
Cc:     gregkh@...uxfoundation.org, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] usb: ohci-at91: Fix the unhandle interrupt when resume

On Mon, Jun 26, 2023 at 11:27:13PM +0800, Guiting Shen wrote:
> The ohci_hcd_at91_drv_suspend() sets ohci->rh_state to OHCI_RH_HALTED when
> suspend which will let the ohci_irq() skip the interrupt after resume. And
> nobody to handle this interrupt.
> 
> According to the comment in ohci_hcd_at91_drv_suspend(), it need to reset
> when resume from suspend(MEM) to fix by setting "hibernated" argument of
> ohci_resume().
> 
> Signed-off-by: Guiting Shen <aarongt.shen@...il.com>
> ---

Reviewed-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/host/ohci-at91.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index 533537ef3c21..360680769494 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -673,7 +673,13 @@ ohci_hcd_at91_drv_resume(struct device *dev)
>  	else
>  		at91_start_clock(ohci_at91);
>  
> -	ohci_resume(hcd, false);
> +	/*
> +	 * According to the comment in ohci_hcd_at91_drv_suspend()
> +	 * we need to do a reset if the 48Mhz clock was stopped,
> +	 * that is, if ohci_at91->wakeup is clear. Tell ohci_resume()
> +	 * to reset in this case by setting its "hibernated" flag.
> +	 */
> +	ohci_resume(hcd, !ohci_at91->wakeup);
>  
>  	return 0;
>  }
> -- 
> 2.25.1
>