linux-kernel - Re: [PATCH 1/2] dma: tegra: set DMA

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Date:	Wed, 27 Jun 2012 18:59:08 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 1/2] dma: tegra: set DMA_CYCLIC capability

On Fri, 2012-06-22 at 17:12 +0530, Laxman Dewangan wrote:
> Tegra's APB DMA driver support the cyclic mode of data
> transfer and hence setting the DMA_CYCLIC caps for dma
> channels.
> 
> This is require when generic sound dmaengine pcm driver
> request for dma channel with CYCLIC capability.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
>  drivers/dma/tegra20-apb-dma.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
> index 134ea7c..b4bd50c 100644
> --- a/drivers/dma/tegra20-apb-dma.c
> +++ b/drivers/dma/tegra20-apb-dma.c
> @@ -1306,6 +1306,8 @@ static int __devinit tegra_dma_probe(struct platform_device *pdev)
>  
>  	dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
>  	dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
> +	dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
> +
>  	tdma->dma_dev.dev = &pdev->dev;
>  	tdma->dma_dev.device_alloc_chan_resources =
>  					tegra_dma_alloc_chan_resources;
What sort of testing went into this.
I can see that you are marking descriptor complete even for cyclic case,
that is wrong you should fix that as well. See the other drivers for
cyclic handling of descriptors.

-- 
~Vinod

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