libata: support the ata host which implements a queue depth less than 32
The sata on fsl mpc8315e is broken after the commit 8a4aeec8 ("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: 8a4aeec8 ("libata/ahci: accommodate tag ordered controllers") Cc: stable@vger.kernel.org Signed-off-by:Kevin Hao <haokexin@gmail.com> Acked-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
Tejun Heo <tj@kernel.org>
parent
7188b067
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