Subject: [PATCH 2/2] ahci_xgene: Fix the dma state machine lockup for the ATA_CMD_PACKET PIO mode command.

From: [email-masked] (Sergei Shtylyov)
Date: Wed, 17 Dec 2014 20:32:01 +0300

Hello.

On 12/17/2014 08:21 AM, Suman Tripathi wrote:

>     This patch addresses the issue with ATA_CMD_PACKET pio mode
>     command for enumeration and device detection with ATAPI devices.It is the
>     same issue as in patch

    Ugh, HTML... Please stick to plain text when posting to the 
'vger.kernel.org' mailing lists (HTML mails are supposed to be ignored).

>     www.spinics.net/lists/linux-__ide/msg49092.html
>     <http://www.spinics.net/lists/linux-ide/msg49092.html>
>
>
>     Signed-off-by: Suman Tripathi <stripathi at apm.com <mailto:[email-masked]>>
>     ---
>        drivers/ata/ahci_xgene.c | 12 +++++++-----
>        1 file changed, 7 insertions(+), 5 deletions(-)
>
>
>     diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
>     index 0ffd3c9..9730907 100644
>     --- a/drivers/ata/ahci_xgene.c
>     +++ b/drivers/ata/ahci_xgene.c
>     @@ -125,10 +125,11 @@ static int xgene_ahci_restart_engine(__struct
>     ata_port *ap)
>         * xgene_ahci_qc_issue - Issue commands to the device
>         * @qc: Command to issue
>         *
>     - * Due to Hardware errata for IDENTIFY DEVICE command, the controller cannot
>     - * clear the BSY bit after receiving the PIO setup FIS. This results in
>     the dma
>     - * state machine goes into the CMFatalErrorUpdate state and locks up. By
>     - * restarting the dma engine, it removes the controller out of lock up state.
>     + * Due to Hardware errata for IDENTIFY DEVICE command and COMMAND PACKET
>
>
>     Just PACKET.
>
>     + * command of ATAPI protocol set, the controller cannot clear the BSY bit
>     + * after receiving the PIO setup FIS. This results in the dma state machine
>
>
>     DMA.
>
>     + * goes into the CMFatalErrorUpdate state and locks up. By restarting the

>     s/goes/going/.

> [suman] : Didn't understand this. Do you mean to change to going ?

    It's a 'sed' command to replace "goes" by "going" IIRC. Yes. Also, 
s/locks/locking/.

> It is already goes there.

> [...]

> Thanks,
> with regards,
> suman

MBR, Sergei