[PATCH] dmaengine/ste_dma40: clear LNK on channel startup

From: Narayanan G
Date: Wed Dec 28 2011 - 00:58:29 EST

From: Rabin Vincent <rabin.vincent@xxxxxxxxxxxxxx>

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 <rabin.vincent@xxxxxxxxxxxxxx>
Reviewed-by: Jonas ABERG <jonas.aberg@xxxxxxxxxxxxxx>
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@xxxxxxxxxxxxxx>
drivers/dma/ste_dma40.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 972dc35..cc5ecbc
--- 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);


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