Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA

[Caesar Wang]

Hi,

Thanks Dinh & Alexander for the intergration testing.

---

@Dinh,

Can you test it again with the patch[0]?

patch[0]:
https://patchwork.kernel.org/patch/8398511/



-
Caesar
å 2016å02æ23æ 23:14, Dinh Nguyen åé:
> 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
>
>
>
>
> --
> Thanks,
> Caesar