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

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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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drivers/dma/ioat/dma.c
+6
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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);