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>

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 972dc35..cc5ecbc 100644 (file)
--- 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);
        }
 }