This is a note to let you know that I've just added the patch titled
sata_rcar: clear STOP bit in bmdma_start() method
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sata_rcar-clear-stop-bit-in-bmdma_start-method.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From df7e131f6359f20ed8f0a37db039c4f6420a18c2 Mon Sep 17 00:00:00 2001
From: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Date: Tue, 21 May 2013 23:07:54 +0400
Subject: sata_rcar: clear STOP bit in bmdma_start() method
From: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
commit df7e131f6359f20ed8f0a37db039c4f6420a18c2 upstream.
Iff bmdma_setup() has to stop a DMA transfer before starting a new
one, then the STOP bit in the ATAPI_CONTROL1 register will remain set
(it's only cleared when setting the START bit to 1) and then
bmdma_start() method will set both START and STOP bits simultaneously
which should abort the transfer being just started. Avoid that by
explicitly clearing the STOP bit in bmdma_start() method (in this case
it will be ignored on write).
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/sata_rcar.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -548,6 +548,7 @@ static void sata_rcar_bmdma_start(struct
/* start host DMA transaction */
dmactl = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ dmactl &= ~ATAPI_CONTROL1_STOP;
dmactl |= ATAPI_CONTROL1_START;
iowrite32(dmactl, priv->base + ATAPI_CONTROL1_REG);
}
Patches currently in stable-queue which might be from sergei.shtylyov@xxxxxxxxxxxxxxxxxx are
queue-3.9/sata_rcar-fix-interrupt-handling.patch
queue-3.9/sata_rcar-clear-stop-bit-in-bmdma_start-method.patch
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