Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA | Date | Wed, 24 Feb 2016 14:20:14 +0100 |
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Hi,
On Thursday, February 18, 2016 07:07:28 PM 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?
drivers/tty/serial/samsung.c
> 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 fails (UART DMA doesn't work).
> 2) Checkout next-20160211 kernel tree and set src_maxburst and > dst_maxburst to 1 inside UART driver to see is it works?
This succeeds (UART DMA works fine).
Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics
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