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dma: mv_xor: Flush descriptors before activating a channel

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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: <[email protected]>
Signed-off-by: Lior Amsalem <[email protected]>
Signed-off-by: Ezequiel Garcia <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Ezequiel Garcia 2014-05-21 14:02:35 -07:00 • committed by Dan Williams
commit 5a9a55bf91
1 changed files with 3 additions and 5 deletions
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8
drivers/dma/mv_xor.c
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@ -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)