linux-kernel - Re: [PATCH 10/18] spi: s3c64xx: Do not require legacy DMA API in case of S3C64XX

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Date:	Tue, 13 Aug 2013 01:49:53 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
	Dan Williams <djbw@...com>, Jaroslav Kysela <perex@...ex.cz>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Padmavathi Venna <padma.v@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Takashi Iwai <tiwai@...e.de>, Vinod Koul <vinod.koul@...el.com>
Subject: Re: [PATCH 10/18] spi: s3c64xx: Do not require legacy DMA API in case of S3C64XX

On Tuesday 13 of August 2013 00:36:41 Mark Brown wrote:
> On Sun, Aug 11, 2013 at 07:59:22PM +0200, Tomasz Figa wrote:
> > With support for amba-pl08x driver, on S3C64xx the generic DMA engine
> > API can be used instead of the private s3c-dma interface.
> 
> I'm still getting issues for SPI with this:
> 
> [   50.952845] s3c64xx-spi s3c6410-spi.0: Failed to get RX DMA channel
> [   50.953520] spi_master spi0: failed to prepare transfer hardware
> 
> when I test (with -next with this series applied on top), this is from
> the first transfer that tries to DMA - there's actually no RX data.  No
> errors are reported by the DMA controller itself.  I'm also getting
> crashes setting up the audio DMA while derferencecing the channel.
> 
> This is without DT - are there any hookups missing because of that?

Hmm, strange.

I've been testing this without any significant patches, like PWM, CCF or 
DT support, just everything from the branch I pointed to and some board-
specific patches to help in debugging.

Anyway, this is the exact branch I've been using:

git://github.com/tom3q/linux.git v3.12-pl080-devel

Best regards,
Tomasz

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