Re: [PATCH Resend] ahci: Acer SA5-271 SSD Not Detected Fix

[Tejun Heo <tj@kernel.org>]

Hello, Sui.

On Tue, May 09, 2017 at 07:47:22AM -0500, Sui Chen wrote:
> (Correction in this resend: fixed function name acer_sa5_271_workaround; fixed
>  the always-true condition in the function; fixed description.)
> 
> On the Acer Switch Alpha 12 (model number: SA5-271), the internal SSD may not
> get detected because the port_map and CAP.nr_ports combination causes the driver
> to skip the port that is actually connected to the SSD. More specifically,
> either all SATA ports are identified as DUMMY, or all ports get ``link down''
> and never get up again.
> 
> This problem occurs occasionally. When this problem occurs, CAP may hold a
> value of 0xC734FF00 or 0xC734FF01 and port_map may hold a value of 0x00 or 0x01.
> When this problem does not occur, CAP holds a value of 0xC734FF02 and port_map
> may hold a value of 0x07. Overriding the CAP value to 0xC734FF02 and port_map to
> 0x7 significantly reduces the occurrence of this problem.
> 
> Link: https://bugzilla.kernel.org/attachment.cgi?id=253091
> Signed-off-by: Sui Chen <suichen6@gmail.com>
> Tested-by: Damian Ivanov <damianatorrpm@gmail.com>

Applied to libata/for-4.12-fixes w/ stable cc'd and a couple trivial
changes.

> @@ -1636,6 +1669,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct
> pci_device_id *ent)

The patch was new line damaged here.  You probably wanna make sure
that your mail client isn't breaking long lines automatically.

Thanks!

-- 
tejun