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

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Hello.

On 12/16/2014 07:49 PM, 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

www.spinics.net/lists/linux-ide/msg49092.html

Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
---
  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/.

+ * dma engine, it removes the controller out of lock up state.

   DMA again.

   */
  static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
  {
[...]

MBR, Sergei

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