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    Subject[PATCH] dmaengine/ste_dma40: clear LNK on channel startup
    Date
    From: Rabin Vincent <rabin.vincent@stericsson.com>

    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>
    ---
    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);
    }
    }

    --
    1.7.4.3


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