linux-kernel - Re: [PATCH v5 06/10] dmaengine: add API for getting dma controller's quirk

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Message-ID: <20151005153746.GG13501@vkoul-mobl.iind.intel.com>
Date:	Mon, 5 Oct 2015 16:37:47 +0100
From:	Vinod Koul <vinod.koul@...el.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Heiko Stuebner <heiko@...ech.de>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Mark Brown <broonie@...nel.org>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olofj@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-spi@...r.kernel.org
Subject: Re: [PATCH v5 06/10] dmaengine: add API for getting dma controller's
 quirk

On Mon, Sep 14, 2015 at 07:48:59AM +0800, Shawn Lin wrote:
> Add dmaengine_get_quirks API for peripheral devices to query
> quirks if they need it to make special workaround due to broken
> dma controller design.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
> Changes in v5: None
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> Changes in v1: None
> 
>  include/linux/dmaengine.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index e2f5eb4..5174ca4 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -704,6 +704,7 @@ struct dma_device {
>  
>  	int (*device_config)(struct dma_chan *chan,
>  			     struct dma_slave_config *config);
> +	int (*device_get_quirks)(struct dma_chan *chan);

And why do we want to expose this to users? THis doesnt seem right!

A quirk may exists but should be handled inside the controller driver and do
appropriate action. You don't tell users or expect them to handle these

-- 
~Vinod
--
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