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Subject: Re: [PATCH 1/1] Big endian swap for Marvell 6440 SAS driver
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: =?ISO-8859-1?Q?C=E9dric?= Cano <ccano@interfaceconcept.com>
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Date: Sun, 12 Jun 2011 08:45:56 +1000
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On Fri, 2011-06-10 at 15:56 +0200, Cédric Cano wrote:
> Hi,
> 
> Marvell SAS driver doesn't work on powerpc architecture due to big 
> endian swap. I've tested it with the MV6440 chip.
> Here you can find the patch for Linux 2.6.39.1.
> 
> Cedric Cano
> 
> Signed-off-by: Cedric Cano <ccano@interfaceconcept.com>
> ---
> --- drivers/scsi/mvsas/mv_sas.c    2011-06-10 15:50:04.000000000 +0200
> +++ drivers/scsi/mvsas/mv_sas.c    2011-06-10 15:50:12.000000000 +0200
> @@ -1143,6 +1143,14 @@
>       MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG0);
>       s[0] = MVS_CHIP_DISP->read_port_cfg_data(mvi, i);
> 
> +    /* swap for big endian devices because of use of these data in bytes */
> +#ifdef __BIG_ENDIAN
> +    s[0] = swab32(s[0]);
> +    s[1] = swab32(s[1]);
> +    s[2] = swab32(s[2]);
> +    s[3] = swab32(s[3]);
> +#endif /* __BIG_ENDIAN */

Hi Cedric !

Thanks for this. CC'ing linux-scsi.

Note that it would probably have been better to use le32_to_cpu, which
avoids the ifdef completely.

Cheers,
Ben.

>       /* Workaround: take some ATAPI devices for ATA */
>       if (((s[1] & 0x00FFFFFF) == 0x00EB1401) && (*(u8 *)&s[3] == 0x01))
>           s[1] = 0x00EB1401 | (*((u8 *)&s[1] + 3) & 0x10);
> 
> ---
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