linux-kernel - Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA

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Date:	Wed, 24 Feb 2016 14:20:14 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Alexander Kochetkov <al.kochet@...il.com>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	shawn.lin@...kchips.com, Addy Ke <addy.ke@...k-chips.com>,
	Boojin Kim <boojin.kim@...sung.com>, wxt@...k-chips.com,
	dmaengine@...r.kernel.org, olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA


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