On Fri, Jul 11, 2014 at 9:08 PM, Kevin Hao <haokexin@xxxxxxxxx> wrote:
> The sata on fsl mpc8315e is broken after the commit 8a4aeec8d2d6
> ("libata/ahci: accommodate tag ordered controllers"). The reason is
> that the ata controller on this SoC only implement a queue depth of
> 16. When issuing the commands in tag order, all the commands in tag
> 16 ~ 31 are mapped to tag 0 unconditionally and then causes the sata
> malfunction. It makes no senses to use a 32 queue in software while
> the hardware has less queue depth. So consider the queue depth
> implemented by the hardware when requesting a command tag.
>
> Fixes: 8a4aeec8d2d6 ("libata/ahci: accommodate tag ordered controllers")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Kevin Hao <haokexin@xxxxxxxxx>
Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>
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