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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2014-05-22 01:02:35 +0400
committerDan Williams <dan.j.williams@intel.com>2014-05-22 01:02:35 +0400
commit5a9a55bf9157d3490b0c8c4c81d4708602c26e07 (patch)
tree297bf8eb393a33f87452a2421b28225b3714a3af /drivers/dma
parentd6d211db37e75de2ddc3a4f979038c40df7cc79c (diff)
downloadlinux-5a9a55bf9157d3490b0c8c4c81d4708602c26e07.tar.xz
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/mv_xor.c8
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)