diff options
| author | Ezequiel Garcia <ezequiel.garcia@free-electrons.com> | 2014-05-21 14:02:35 -0700 |
|---|---|---|
| committer | Show Liu <show.liu@linaro.org> | 2014-06-18 12:05:07 +0800 |
| commit | fb362f00a2507cbae4f3063a2706e7a491010fe5 (patch) | |
| tree | 864eaec93deed5d5259b62b53c158392a0235930 /drivers | |
| parent | 6c21e3f5eda733d7e3af528218fd95a64da9abd6 (diff) | |
dma: mv_xor: Flush descriptors before activating a channel
commit 5a9a55bf9157d3490b0c8c4c81d4708602c26e07 upstream.
We need to use writel() instead of writel_relaxed() when starting
a channel, to ensure all the descriptors have been flushed before
the activation.
While at it, remove the unneeded read-modify-write and make the
code simpler.
Signed-off-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/mv_xor.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 766b68ed505..394cbc5c93e 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -191,12 +191,10 @@ static void mv_set_mode(struct mv_xor_chan *chan, static void mv_chan_activate(struct mv_xor_chan *chan) { - u32 activation; - dev_dbg(mv_chan_to_devp(chan), " activate chan.\n"); - activation = readl_relaxed(XOR_ACTIVATION(chan)); - activation |= 0x1; - writel_relaxed(activation, XOR_ACTIVATION(chan)); + + /* writel ensures all descriptors are flushed before activation */ + writel(BIT(0), XOR_ACTIVATION(chan)); } static char mv_chan_is_busy(struct mv_xor_chan *chan) |