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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 8b5b23a8ace9..23fb2fa04000 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -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);