[PATCH v3 2/2] ata: Fix the dma state machine lockup for the IDENTIFY DEVICE PIO mode command.
tj at kernel.org
Thu Jun 19 07:21:48 PDT 2014
On Thu, Jun 19, 2014 at 07:44:28PM +0530, Suman Tripathi wrote:
> Hi Tejun,
> On Thu, Jun 19, 2014 at 12:20:54PM +0530, Suman Tripathi wrote:
> > + /*
> > + * Restart the dma engine if the last cmd issued
> > + * is IDENTIFY DEVICE command
> > + */
> > + if (unlikely(ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA))
> > + ahci_restart_engine(ap);
> Is it really only for IDENTIFY? Are other PIO commands okay?
> [Suman] : We root cause it , It is the IDENTIFY DEVICE command . Other are
> Theprevious version applied it to all PIO commands, right?
> [suman] : The v2 contains only the IDENTIFY DEVICE. The v1 is contains for
> all PIO commands and that didn't work because the ERRATA mentions that it
> happens for the IDENTIFY DEVICE command.
So, it's just ATA_CMD_ID_ATA and ATA_CMD_ID_ATAPI is okay? That's
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