Re: [boot regression PATCH] libata: allow xgene-ahci to opt-out of tag ordered submission

[Dan Williams]

On Fri, Jun 6, 2014 at 8:52 AM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
> Ming Lei reports:
>   "Looks the commit 8a4aeec8d(libata/ahci: accommodate tag ordered
>    controllers) causes below sata failure on APM AHCI controller.
>
>    And the error does disappear after reverting the commit.
>
>      ata4.00: exception Emask 0x40 SAct 0xff00 SErr 0x800 action 0x6 frozen
>      ata4: SError: { HostInt }
>      ata4.00: failed command: READ FPDMA QUEUED
>      ata4.00: cmd 60/08:40:e0:a4:88/00:00:04:00:00/40 tag 8 ncq 4096 in
>               res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x44 (timeout)"
>
> http://marc.info/?l=linux-kernel&m=140195842716315&w=2
>
> Maintain tag ordered submission as the default, but allow xgene-ahci to
> continue with the old behavior.
>
> Cc: Loc Ho <lho@xxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Cc: Tuan Phan <tphan@xxxxxxx>
> Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
> Cc: Suman Tripathi <stripathi@xxxxxxx>
> Cc: Ed Ciechanowski <ed.ciechanowski@xxxxxxxxx>
> Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
> Tested-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
> Reported-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---

Hold off on this as it appears an ahci_xgene fix is on its way.
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