lkml.org 
[lkml]   [2016]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 03/10] dma: imx-sdma: clear BD_RROR flag before pass it to sdma script
Date
Previously in cyclic dma mode when sdma transfer fails for one buffer,
it will mask BD_RROR flag for that buffer descriptor (BD). This flag
won't be cleared unless a new cyclic dma transfer is prepared, so if
sdma script next time iterates to the same BD, even this time the
transfer is successful, but as BD_RROR flag is set, client side
will still think the transfer failed.

This patch clears BD_RROR flag before pass it to sdma script.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
drivers/dma/imx-sdma.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 887e4e5..1489de0 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -671,6 +671,7 @@ static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
if (bd->mode.status & BD_RROR)
sdmac->status = DMA_ERROR;

+ bd->mode.status &= ~BD_RROR;
bd->mode.status |= BD_DONE;
sdmac->buf_tail++;
sdmac->buf_tail %= sdmac->num_bd;
--
2.4.5
\
 
 \ /
  Last update: 2016-05-16 11:01    [W:0.094 / U:0.352 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site