linux-kernel - Re: [PATCH v1 1/3] usb: musb: core: added musb_restart() API to handle babble condition

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Date:	Wed, 26 Jun 2013 11:24:57 +0300
From:	Felipe Balbi <balbi@...com>
To:	Ravi Babu <ravibabu@...com>
CC:	<linux-usb@...r.kernel.org>, <balbi@...com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] usb: musb: core: added musb_restart() API to
 handle babble condition

On Wed, May 29, 2013 at 06:37:02PM +0530, Ravi Babu wrote:
> Added musb_restart() API, used for restart of the musb controller by
> the glue layer, when there is babble condition occured on the bus.
> 
> During babble condition, the musb controller will remove the session
> and no longer in host-mode. As part of recovery this API can be used
> to restart the musb controller.
> 
> Signed-off-by: Ravi Babu <ravibabu@...com>
> ---
>  drivers/usb/musb/musb_core.c |   24 ++++++++++++++++++++++++
>  drivers/usb/musb/musb_core.h |    1 +
>  2 files changed, 25 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 37a261a..ab6fa39 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -1373,6 +1373,30 @@ static int ep_config_from_hw(struct musb *musb)
>  	return 0;
>  }
>  
> +/*
> + * musb_restart - restarts musb controller
> + * @param musb the controller
> + */
> +int musb_restart(struct musb *musb)
> +{
> +	int status = 0;
> +
> +	/* during babble condition the musb controller removes the
> +	 * session bit and the fifo table initialized value get changed
> +	 */
> +	if (musb->dyn_fifo)
> +		status = ep_config_from_table(musb);
> +	else
> +		status = ep_config_from_hw(musb);
> +
> +	/* starts session */
> +	if (!status)
> +		musb_start(musb);
> +
> +	return status;
> +}
> +EXPORT_SYMBOL_GPL(musb_restart);

this sort of function should never be exposed outside of MUSB core
itself. This points to a big problem somewhere else.

let me continue reading the other two patches...

-- 
balbi

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