linux-kernel - Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in HOST mode

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Message-ID: <CADYTM3bd8Bq5QTn-HC4jYX-owEw_sF1DOtXsc-cMDqKHGJHXjQ@mail.gmail.com>
Date:	Mon, 19 May 2014 10:54:04 -0500
From:	Bin Liu <binmlist@...il.com>
To:	George Cherian <george.cherian@...com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, gregkh@...uxfoundation.org,
	balbi@...com, zonque@...il.com, b-liu@...com
Subject: Re: [PATCH v4 1/6] usb: musb: core: Handle Babble condition only in
 HOST mode

Hi,

On Mon, May 19, 2014 at 8:39 AM, George Cherian <george.cherian@...com> wrote:
> BABBLE and RESET share the same interrupt. The interrupt
> is considered to be RESET if MUSB is in peripheral mode and
> as a BABBLE if MUSB is in HOST mode.
>
> Handle babble condition iff MUSB is in HOST mode.
>
> Signed-off-by: George Cherian <george.cherian@...com>
> ---
>  drivers/usb/musb/musb_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 61da471..eff3c5c 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -849,7 +849,7 @@ b_host:
>         }
>
>         /* handle babble condition */
> -       if (int_usb & MUSB_INTR_BABBLE)
> +       if (int_usb & MUSB_INTR_BABBLE && is_host_active(musb))
>                 schedule_work(&musb->recover_work);

I guess my following comments are for Daniel's patch as while which
initially added the babble work.

Should this if statement be merged into the previous 'if(int_usb &
MUSB_INTR_RESET)' one, which handles the same interrupt and already
handles host and device mode respectively.

Regards,
-Bin.

>
>  #if 0
> --
> 1.8.3.1
>
> --
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