linux-kernel - Re: [PATCH v1 2/3] usb: musb: core: added babble recovery func-ptr to musb->ops

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Message-ID: <20130626082620.GN12640@arwen.pp.htv.fi>
Date:	Wed, 26 Jun 2013 11:26:20 +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 2/3] usb: musb: core: added babble recovery func-ptr
 to musb->ops

Hi,

On Wed, May 29, 2013 at 06:37:03PM +0530, Ravi Babu wrote:
> Adding babble_recovery operation as part of musb->ops, used
> to recover from babble condition during babble interrupt.
> 
> Signed-off-by: Ravi Babu <ravibabu@...com>
> ---
>  drivers/usb/musb/musb_core.c |    6 ++++++
>  drivers/usb/musb/musb_core.h |    7 +++++++
>  2 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index ab6fa39..411c29d 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -857,6 +857,12 @@ b_host:
>  		}
>  	}
>  
> +	/* handle babble condition */
> +	if (int_usb & MUSB_INTR_BABBLE) {
> +		pr_info("babble: restarting the musb controller..");
> +		musb_babble_recovery(musb);
> +	}
> +
>  #if 0
>  /* REVISIT ... this would be for multiplexing periodic endpoints, or
>   * supporting transfer phasing to prevent exceeding ISO bandwidth
> diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
> index f96e899..bf37dc9 100644
> --- a/drivers/usb/musb/musb_core.h
> +++ b/drivers/usb/musb/musb_core.h
> @@ -213,6 +213,8 @@ struct musb_platform_ops {
>  	int	(*adjust_channel_params)(struct dma_channel *channel,
>  				u16 packet_sz, u8 *mode,
>  				dma_addr_t *dma_addr, u32 *len);
> +
> +	void	(*babble_recovery)(struct musb *musb);

I don't get why can't 'babble_recovery' be generic. Why do we need each
glue layer to implement it ?

-- 
balbi

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