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SubjectRe: commit 271e1b86e691 is breaking DMA uart on SoCFPGA
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Hi,

Sorry that I couldn't get to this sooner.

On 02/18/2016 10:07 AM, Alexander Kochetkov wrote:
> Hello!
>
> Bartlomiej, could you please tell what uart driver is used on Samsung
> Exynos4412?
> Dinh, could you please tell what uart driver is used on SoCFPGA?
>

SoCFPGA is using the 8250_dw.c uart driver.

> Could you make two test?
>
> 1) Checkout tree at commit 848e9776fee4 "dmaengine: pl330: support
> burst mode for
> dev-to-mem and mem-to-dev transmit", make it buildable and see is it
> works. In order to make in buildable remove bursts argument from the
> line:
>
> if (*bursts == 1)
> - return _bursts(pl330, dry_run, buf, pxs, 1);
> + return _bursts(dry_run, buf, pxs, 1);
>

This case still fails for me.

> 2) Checkout next-20160211 kernel tree and set src_maxburst and
> dst_maxburst to 1 inside UART driver to see is it works?
>

This case works and the UART is able to operate in DMA mode.

Dinh

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