linux-kernel - [PATCH 03/10] dma: imx-sdma: clear BD_RROR flag before pass it to sdma script

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Message-ID: <1463387878-7643-4-git-send-email-jiada_wang@mentor.com>
Date:	Mon, 16 May 2016 17:37:51 +0900
From:	Jiada Wang <jiada_wang@...tor.com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>
CC:	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<george_davis@...tor.com>, <jiada_wang@...tor.com>
Subject: [PATCH 03/10] dma: imx-sdma: clear BD_RROR flag before pass it to sdma script

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@...tor.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