Re: [PATCH 09/14] ata: Use 32bit DMA in AHCI for Loongson 3.

[huacai chen <chenhuacai@xxxxxxxxx>]

Do you means it is a better idea to modify "enum board_ids" and add a
new board id such as board_ahci_sb700_loongson, and then add a new
entry in ahci_port_info[]?
If so, I think there is a problem: the pci id of our AHCI controller
is 1002:4390, if I add board_ahci_sb700_loongson, then I should also
add
{ PCI_VDEVICE(ATI, 0x4390), board_ahci_sb700_loongson },
in ahci_pci_tbl[], but ahci_pci_tbl[] already has a line
{ PCI_VDEVICE(ATI, 0x4390), board_ahci_sb700 },
Then which entry will match the device?

On Sun, Jun 17, 2012 at 8:05 PM, Borislav Petkov <bp@xxxxxxxxx> wrote:
> On Fri, Jun 15, 2012 at 08:42:47PM +0800, huacai chen wrote:
>> On Fri, Jun 15, 2012 at 6:04 PM, Sergei Shtylyov <sshtylyov@xxxxxxxxxx> wrote:
>> > Hello.
>> >
>> >
>> > On 15-06-2012 12:09, Huacai Chen wrote:
>> >
>> >> Signed-off-by: Huacai Chen<chenhc@xxxxxxxxxx>
>> >> Signed-off-by: Hongliang Tao<taohl@xxxxxxxxxx>
>> >> Signed-off-by: Hua Yan<yanh@xxxxxxxxxx>
>> >
>> >
>> >   You  should have CCed the 'linux-ide' mailing list.
>> >
>> >
>> >> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>> >> index ebaf67e..3e3cfd8 100644
>> >> --- a/drivers/ata/ahci.c
>> >> +++ b/drivers/ata/ahci.c
>> >> @@ -183,7 +183,12 @@ static const struct ata_port_info ahci_port_info[] =
>> >> {
>> >>        },
>> >>        [board_ahci_sb700] =    /* for SB700 and SB800 */
>> >>        {
>> >> +#ifndef CONFIG_CPU_LOONGSON3
>> >>                AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL),
>> >> +#else
>> >> +               AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL |
>> >> +                                               AHCI_HFLAG_32BIT_ONLY),
>> >> +#endif
>> >
>> >
>> >   No, this #ifdef'ery won't do. You should add a new board type.
>> All Loongson-3 based machines use AMD SB700 chipsets, add a new board
>> type is better than #ifdef?
>
> SB700/800 chipsets don't need to set a 32-bit only DMA flag; why do you
> need it when you use the same chipset?
>
> --
> Regards/Gruss,
>    Boris.