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| author | Ezequiel Garcia <ezequiel.garcia@free-electrons.com> | 2014-05-21 14:02:35 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2014-05-21 14:02:35 -0700 |
| commit | 5a9a55bf9157d3490b0c8c4c81d4708602c26e07 (patch) | |
| tree | 297bf8eb393a33f87452a2421b28225b3714a3af | |
| parent | d6d211db37e75de2ddc3a4f979038c40df7cc79c (diff) | |
| download | lwn-5a9a55bf9157d3490b0c8c4c81d4708602c26e07.tar.gz lwn-5a9a55bf9157d3490b0c8c4c81d4708602c26e07.zip | |
dma: mv_xor: Flush descriptors before activating a channel
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.
Cc: <stable@vger.kernel.org>
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>
| -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 766b68ed505c..394cbc5c93e3 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) |