linux-kernel - [PATCH 1/1] [libata] pata-bf54x: Set ATAPI host state machine to control IDE device terminate sequence.

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Date:	Mon, 12 May 2008 12:12:16 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	jgarzik@...ox.com
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sonic Zhang <sonic.zhang@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/1] [libata] pata-bf54x: Set ATAPI host state machine to control IDE device terminate sequence.

From: Sonic Zhang <sonic.zhang@...log.com>

Set ATAPI host state machine to control IDE device terminate sequence.
Some IDE harddisk may assert terminate sequence in the middle of a
formal DMA transaction and resume later. Bit DETECT_TERM in ATAPI_CTRL
register determines whether the ATAPI host state machine or the kernel
driver should take care of this case.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/ata/pata_bf54x.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c
index 9ab8973..5551610 100644
--- a/drivers/ata/pata_bf54x.c
+++ b/drivers/ata/pata_bf54x.c
@@ -911,7 +911,10 @@ static void bfin_bmdma_start(struct ata_queued_cmd *qc)
 	/* Reset all transfer count */
 	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | TFRCNT_RST);
 
-		/* Set transfer length to buffer len */
+	/* Set ATAPI state machine contorl in terminate sequence */
+	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | END_ON_TERM);
+
+	/* Set transfer length to buffer len */
 	for_each_sg(qc->sg, sg, qc->n_elem, si) {
 		ATAPI_SET_XFER_LEN(base, (sg_dma_len(sg) >> 1));
 	}
-- 
1.5.5
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