On 2022/03/03 12:04, Paul Menzel wrote:
> AMD devices with the FCH SATA Controller 0x1022:0x7901 do not need the
> default debounce delay of 200 ms.
>
> 07:00.2 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] [1022:7901] (rev 51)
>
> So skip it, by mapping it to the board with no debounce delay.
>
> Tested on the MSI MS-7A37/B350M MORTAR (MS-7A37).
>
> To-do: Add test details and results.
Please squash this patch together with patch 1. Since you are adding a new board
entry definition, it is better to have a user for it in the same patch (this
avoids reverts to leave unused code behind).
>
> Signed-off-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
> Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
> Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
> ---
> I am travelling so could not test this exact patch just yet, but I ran
> something similar for several weeks already. It’d be great, if the
> desktop and AMD folks could also give this a try.
>
> drivers/ata/ahci.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index 0fc09b86a559..44b79fe43d13 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -456,7 +456,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
> { PCI_VDEVICE(AMD, 0x7800), board_ahci }, /* AMD Hudson-2 */
> { PCI_VDEVICE(AMD, 0x7801), board_ahci_no_debounce_delay }, /* AMD Hudson-2 (AHCI mode) */
> { PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
> - { PCI_VDEVICE(AMD, 0x7901), board_ahci_low_power }, /* AMD Green Sardine */
> + { PCI_VDEVICE(AMD, 0x7901), board_ahci_low_power_no_debounce_delay }, /* AMD Green Sardine */
Really long name, but I cannot think of anything better...
> /* AMD is using RAID class only for ahci controllers */
> { PCI_VENDOR_ID_AMD, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
> PCI_CLASS_STORAGE_RAID << 8, 0xffffff, board_ahci },
--
Damien Le Moal
Western Digital Research
