linux-kernel - Re: [RFC PATCH v2 00/12] ARM: s3c64xx: Let amba-pl08x driver handle DMA

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Date:	Tue, 25 Jun 2013 16:38:43 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tomasz Figa <t.figa@...sung.com>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-spi@...r.kernel.org, alsa-devel@...a-project.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	Grant Likely <grant.likely@...aro.org>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Padmavathi Venna <padma.v@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Heiko Stübner <heiko@...ech.de>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alban Bedel <alban.bedel@...onic-design.de>
Subject: Re: [RFC PATCH v2 00/12] ARM: s3c64xx: Let amba-pl08x driver handle
 DMA

On Tue, Jun 25, 2013 at 01:22:20PM +0200, Tomasz Figa wrote:
> On Tuesday 25 of June 2013 11:28:18 Mark Brown wrote:

> > On my non-DT s3c64xx system I get this when trying to use SPI for the
> > first time:

> Could you clarify first time? Does it work on further retries?

No, the system appears to lock up fairly solidly - I suspect poor error
handling in the SPI driver.

> > [    1.739385] s3c64xx-spi s3c6410-spi.0: Failed to get RX DMA channel
> > [    1.743437] spi_master spi0: failed to prepare transfer hardware

> > though I haven't yet tried your clock patches (there were some conficts
> > that I didn't get round to picking up yet).

> This shouldn't really matter, as long as the pl080 drivers probes 
> correctly.

Indeed, I was wondering if it was failing to probe due to not getting
its clocks though since that's another area you've been actively working
on.

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