Hi, On Thu, Dec 24, 2009 at 06:05:55AM +0100, ext Mike Frysinger wrote:
From: Cliff Cai <cliff.cai@xxxxxxxxxx> Due to some anomalies, utilizing DMA double buffer may lead to infinite hangs or data corruption. So when this anomalies exist, disable double buffering mode. Signed-off-by: Cliff Cai <cliff.cai@xxxxxxxxxx> Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx>
I believe blackfin doesn't have dynamic fifo sizing and double buffering is enabled on the hw table ?
I've seen data corruption when using double buffering also with dynamic fifo sizing and that's why none of the fifo tables have double buffering enabled.
this tells me that we really can't trust musb's double buffering at all and we can make a check based on the rtl revision. At least until rtl1.9 we can't use double buffering, no matter what the fifo table or hardware ep configuration says.
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