linux-kernel - Re: [PATCH v2 05/53] dmaengine: Add device_terminate

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Message-ID: <3094993.Wejb51jFmk@avalon>
Date:	Thu, 16 Oct 2014 13:46:29 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	dmaengine@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Antoine Ténart <antoine@...e-electrons.com>,
	lars@...afoo.de, Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH v2 05/53] dmaengine: Add device_terminate_all callback

Hi Maxime,

Thank you for the patch.

On Thursday 16 October 2014 12:17:04 Maxime Ripard wrote:
> Split out the terminate_all command from device_control to a dma_device
> callback. In order to preserve backward capability, still rely on
> device_control if no such callback has been implemented.
> 
> Eventually, this will allow to create a generic dma_slave_caps callback.

I like eventually better than hopefully ;-)

> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  include/linux/dmaengine.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index b89c8004fcd8..4d0294ec3567 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -616,6 +616,8 @@ struct dma_tx_state {
>   *	0 or an error code
>   * @device_resume: Resumes any transfer on a channel previously
>   *	paused. Returns 0 or an error code
> + * @device_terminate_all: Aborts all transfers on a channel. Returns 0
> + *	or an error code
>   * @device_tx_status: poll for transaction completion, the optional
>   *	txstate parameter can be supplied with a pointer to get a
>   *	struct with auxiliary transfer status information, otherwise the call
> @@ -686,6 +688,7 @@ struct dma_device {
>  			      unsigned long arg);
>  	int (*device_pause)(struct dma_chan *chan);
>  	int (*device_resume)(struct dma_chan *chan);
> +	int (*device_terminate_all)(struct dma_chan *chan);
>  	enum dma_status (*device_tx_status)(struct dma_chan *chan,
>  					    dma_cookie_t cookie,
>  					    struct dma_tx_state *txstate);
> @@ -784,6 +787,9 @@ static inline int dma_get_slave_caps(struct dma_chan
> *chan, struct dma_slave_cap
> 
>  static inline int dmaengine_terminate_all(struct dma_chan *chan)
>  {
> +	if (chan->device->device_terminate_all)
> +		return chan->device->device_terminate_all(chan);
> +
>  	return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);
>  }

-- 
Regards,

Laurent Pinchart

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