Messages in this thread | | | Subject | Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA | From | Dinh Nguyen <> | Date | Tue, 23 Feb 2016 09:14:38 -0600 |
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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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