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authorHans Verkuil <hverkuil@xs4all.nl>2007-07-29 00:45:50 +0200
committerHans Verkuil <hverkuil@xs4all.nl>2007-07-29 00:45:50 +0200
commit4fcf11d4d6be97e5d2d4829f7a8af18205289d04 (patch)
tree497b94abe01cca07f83f5f907870fd2f594895ff /Makefile
parentfe63b013b5d4c0822f2cb6868de131e3c62dcc35 (diff)
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ivtv: Fix scatter/gather DMA timeouts
From: Hans Verkuil <hverkuil@xs4all.nl> It turns out that the cx23415/6 DMA engine cannot do scatter/gather DMA reliably. Every so often depending on the phase of the moon and your hardware configuration the cx2341x DMA engine simply chokes on it and you have to reboot to get it working again. This change replaced the scatter/gather DMA by single transfers at a time, where the driver is now responsible for DMA-ing each buffer. UDMA is still done using scatter/gather DMA, that will be fixed soon. Many thanks to Mark Bryars <mark.bryars@etvinteractive.com> for discovering the link between scatter/gather and the DMA timeouts. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
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