Re: [PATCH] spi: s3c64xx: Don't request/release DMA channels for each SPI transfer

[Andi Shyti <andi.shyti@xxxxxxxxxxx>]

Hi Marek,

On Thu, Dec 29, 2016 at 01:19:31PM +0100, Marek Szyprowski wrote:
> Requesting a DMA channel might be a time consuming operation, so there is
> no need to acquire and release DMA channel for each SPI transfer.
> DMA channels can be requested during driver probe and kept all the time,
> also because there are no shared nor dynamically allocated channels on
> Samsung S3C/S5P/Exynos platforms.
> 
> While moving dma_requrest_slave_channel calls, lets switch to
> dma_request_slave_channel_reason(), which returns error codes on failure,
> which can be properly propagated to the caller (this for example defers
> SPI probe when DMA controller is not yet available).
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

Thanks!

Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxx>
Tested-by: Andi Shyti <andi.shyti@xxxxxxxxxxx>

Andi
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