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 <rabin.vincent@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 4 insertions, 0 deletions

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);
         }
 }