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Date: Fri, 4 Mar 2011 15:42:50 +0530 From: Viresh Kumar <viresh.kumar@...com> To: <vinod.koul@...el.com>, <dan.j.williams@...el.com> Cc: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <viresh.linux@...il.com>, <shiraz.hashim@...com>, <armando.visconti@...com>, <amit.goel@...com>, <jamie@...ieiles.com>, <hans-christian.egtvedt@...el.com>, Viresh Kumar <viresh.kumar@...com> Subject: [PATCH 06/13 resend] dw_dmac: Change value of DWC_MAX_COUNT to 4095. Every descriptor can transfer a maximum count of 4095 (12 bits, in control reg), So we must have DWC_MAX_COUNT as 4095 instead of 2048. Signed-off-by: Viresh Kumar <viresh.kumar@...com> --- drivers/dma/dw_dmac.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index e5d97bf..711ebe9 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -47,14 +47,13 @@ /* * This is configuration-dependent and usually a funny size like 4095. - * Let's round it down to the nearest power of two. * * Note that this is a transfer count, i.e. if we transfer 32-bit - * words, we can do 8192 bytes per descriptor. + * words, we can do 16380 bytes per descriptor. * * This parameter is also system-specific. */ -#define DWC_MAX_COUNT 2048U +#define DWC_MAX_COUNT 4095U /* * Number of descriptors to allocate for each channel. This should be -- 1.7.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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