From 7d853dd41b21fbffb4ae245e1d8fcb2acfe5afab Mon Sep 17 00:00:00 2001 From: Zeng Zhaoming Date: Mon, 18 Jul 2011 11:55:41 +0800 Subject: [PATCH] ENGR00152287-3 SDMA: Fix sdma cache bufferable issue MX6Q desclare dma memory bufferable, which cause sdma load context failed in 60% possibility. To fix it, we need to add dsb to flush write buffer before start dma transfer. Signed-off-by: Zeng Zhaoming --- drivers/dma/imx-sdma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 0ed6c6e99ff4..3642ca4d07bd 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -373,6 +373,7 @@ static int sdma_run_channel(struct sdma_channel *sdmac) init_completion(&sdmac->done); + wmb(); __raw_writel(1 << channel, sdma->regs + SDMA_H_START); ret = wait_for_completion_timeout(&sdmac->done, HZ); @@ -768,6 +769,7 @@ out: static void sdma_enable_channel(struct sdma_engine *sdma, int channel) { + wmb(); __raw_writel(1 << channel, sdma->regs + SDMA_H_START); } -- 2.39.2