linux-kernel - Re: [PATCH v4 57/58] dmaengine: Add a warning for drivers not using the generic slave caps retrieval

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Message-ID: <3524784.Rq7vyuKpLx@avalon>
Date:	Wed, 29 Oct 2014 00:06:54 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Antoine Ténart <antoine@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>, lars@...afoo.de
Subject: Re: [PATCH v4 57/58] dmaengine: Add a warning for drivers not using the generic slave caps retrieval

Hi Maxime,

Thank you for the patch.

On Tuesday 28 October 2014 22:26:12 Maxime Ripard wrote:
> For the slave caps retrieval to be really useful, most drivers need to
> implement it.
> 
> Hence, we need to be slightly more aggressive, and trigger a warning at
> registration time for drivers that don't fill their caps infos in order to
> encourage them to implement it.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

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

> ---
>  drivers/dma/dmaengine.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index 98e9431f85ec..300c8cd2786c 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -827,6 +827,9 @@ int dma_async_device_register(struct dma_device *device)
> BUG_ON(!device->device_issue_pending);
>  	BUG_ON(!device->dev);
> 
> +	WARN(dma_has_cap(DMA_SLAVE, device->cap_mask) && !device->directions,
> +	     "this driver doesn't support generic slave capabilities
> reporting\n"); +
>  	/* note: this only matters in the
>  	 * CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case
>  	 */

-- 
Regards,

Laurent Pinchart

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