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dmaengine: ioatdma: set the completion address register after channel reset 

It seems that starting with Skylake Xeon, channel reset clears the
completion address register. Make sure the completion address register is
set again after reset.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2018-06-11 12:49:03 -07:00 committed by Vinod Koul
parent ce397d215c
commit 4cb0e60112
1 changed files with 6 additions and 0 deletions
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6
drivers/dma/ioat/dma.c
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@ -688,6 +688,12 @@ static void ioat_restart_channel(struct ioatdma_chan *ioat_chan)
{
u64 phys_complete;
/* set the completion address register again */
writel(lower_32_bits(ioat_chan->completion_dma),
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(upper_32_bits(ioat_chan->completion_dma),
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
ioat_quiesce(ioat_chan, 0);
if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
__cleanup(ioat_chan, phys_complete);