Hello Mark and Vladimir
On 01/05/2017 09:58 AM, Mark Brown wrote:
On Thu, Jan 05, 2017 at 03:10:15PM +0900, Jiada Wang wrote:
Previously watermark level is configured to fifosize/2,
DMA mode can be used only when transfer length can be divided
by 'watermark level * bpw', which makes DMA mode not practical.
This patch adds new DTS property 'dma-wml', user can configure
DMA watermark level, by specify 'dma-wml' in corresponding ecspi
node.
Doesn't this just move the problem around a bit - can we not have the
driver figure out a more sensible watermark for each transfer rather
than fixing one in the DT?
I would like to submit another version of patch to adjust watermark level
based on transfer length. to use largest number (< fifosize / 2 ) which
can divide
(transfer_length / bytes_per_work).
Thanks,
Jiada
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