Reinitialize link mode descriptor head during terminate_all().
It fixes the incorrect serial messages during serial transfer when
DMA is enabled.
Based on a patch in the BSP by Long Luu
<long.luu.ur@xxxxxxxxxxx>
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
drivers/dma/sh/rz-dmac.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index 6b62e01ba658..a04a37ce03fd 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -534,11 +534,18 @@ rz_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
static int rz_dmac_terminate_all(struct dma_chan *chan)
{
struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
+ struct rz_lmdesc *lmdesc = channel->lmdesc.base;
unsigned long flags;
+ unsigned int i;
+
LIST_HEAD(head);
rz_dmac_disable_hw(channel);
spin_lock_irqsave(&channel->vc.lock, flags);
+
+ for (i = 0; i < DMAC_NR_LMDESC; i++)
+ lmdesc[i].header = 0;
+
list_splice_tail_init(&channel->ld_active, &channel->ld_free);
list_splice_tail_init(&channel->ld_queue, &channel->ld_free);
spin_unlock_irqrestore(&channel->vc.lock, flags);
--
2.25.1
