Re: [PATCH] dmaengine: jz4780: set DMA maximum segment size

From: Vinod Koul
Date: Wed Apr 20 2022 - 07:43:45 EST


On 11-04-22, 16:36, Aidan MacDonald wrote:
> Set the maximum segment size, since the hardware can do transfers larger
> than the default 64 KiB returned by dma_get_max_seg_size().
>
> The maximum segment size is limited by the 24-bit transfer count field
> in DMA descriptors. The number of bytes is equal to the transfer count
> times the transfer size unit, which is selected by the driver based on
> the DMA buffer address and length of the transfer. The size unit can be
> as small as 1 byte, so set the maximum segment size to 2^24-1 bytes to
> ensure the transfer count will not overflow regardless of the size unit
> selected by the driver.

Applied, thanks

--
~Vinod