From: grant.likely@secretlab.ca (Grant Likely)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2] mxs: spi: clear XFER_COUNT in ctrl0 field in DMA descriptor
Date: Tue, 05 Feb 2013 12:45:35 +0000 [thread overview]
Message-ID: <20130205124535.D59043E0E27@localhost> (raw)
In-Reply-To: <1356500931-31861-1-git-send-email-juha.lumme@gmail.com>
On Wed, 26 Dec 2012 14:48:51 +0900, Juha Lumme <juha.lumme@gmail.com> wrote:
> On MX23 the XFER_COUNT part in ctrl0 field in DMA descriptor was improperly
> OR'd during the construction of DMA descriptor chain, instead of being
> freshly set.
> Because of that too many bytes were being expected from SPI during the last
> DMA cycle.
> This caused a timeout (SSP_TIMEOUT) to happen in the processing of the last
> DMA descriptor, and thus reads and writes were failing.
> This is a fix for the problem, by clearing XFER_COUNT bytes in ctrl0 before
> setting the new XFER_COUNT for DMA descriptor.
>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Shawn Guo <shawn.guo@linaro.org>
Applied, thanks.
g.
prev parent reply other threads:[~2013-02-05 12:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-26 5:48 [PATCH V2] mxs: spi: clear XFER_COUNT in ctrl0 field in DMA descriptor Juha Lumme
2013-01-07 12:13 ` Marek Vasut
2013-02-05 12:45 ` Grant Likely [this message]
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