From e9f3a49c9698da6f6b606d5e048ddce308438763 Mon Sep 17 00:00:00 2001 From: Rabin Vincent Date: Wed, 28 Dec 2011 11:27:40 +0530 Subject: [PATCH] dmaengine/ste_dma40: clear LNK on channel startup Otherwise if a previously physical channel is used as a logical channel, the LNK may have old values which affect the operation of the logical channel since the LNK register has different semantics between physical and logical channels. Signed-off-by: Rabin Vincent Reviewed-by: Jonas ABERG Signed-off-by: Narayanan G Acked-by: Linus Walleij Signed-off-by: Vinod Koul --- drivers/dma/ste_dma40.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 972dc35770f9..cc5ecbc067a3 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -1104,6 +1104,10 @@ static void d40_config_write(struct d40_chan *d40c) /* Set LIDX for lcla */ writel(lidx, chanbase + D40_CHAN_REG_SSELT); writel(lidx, chanbase + D40_CHAN_REG_SDELT); + + /* Clear LNK which will be used by d40_chan_has_events() */ + writel(0, chanbase + D40_CHAN_REG_SSLNK); + writel(0, chanbase + D40_CHAN_REG_SDLNK); } } -- GitLab