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Message-ID: <960946b8-8f73-9f81-735a-64e5cc555a9c@molgen.mpg.de>
Date:   Mon, 14 Feb 2022 09:07:39 +0100
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Subject: Re: [PATCH 1/2] ahci: Add Green Sardine vendor ID as
 board_ahci_mobile
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To:     Mario Limonciello <mario.limonciello@amd.com>
Cc:     linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        Nehal-bakulchandra Shah <Nehal-bakulchandra.Shah@amd.com>
References: <20211112201539.17377-1-mario.limonciello@amd.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
In-Reply-To: <20211112201539.17377-1-mario.limonciello@amd.com>
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Dear Mario,


(For the records, is part of Linux since 5.16-rc2 (commit 1527f69204fe).)

Am 12.11.21 um 21:15 schrieb Mario Limonciello:
> AMD requires that the SATA controller be configured for devsleep in order
> for S0i3 entry to work properly.
> 
> commit b1a9585cc396 ("ata: ahci: Enable DEVSLP by default on x86 with
> SLP_S0") sets up a kernel policy to enable devsleep on Intel mobile
> platforms that are using s0ix.  Add the PCI ID for the SATA controller in
> Green Sardine platforms to extend this policy by default for AMD based
> systems using s0i3 as well.
> 
> Cc: Nehal-bakulchandra Shah <Nehal-bakulchandra.Shah@amd.com>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214091
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>   drivers/ata/ahci.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index d60f34718b5d..1e1167e725a4 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -438,6 +438,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
>   	/* AMD */
>   	{ PCI_VDEVICE(AMD, 0x7800), board_ahci }, /* AMD Hudson-2 */
>   	{ PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
> +	{ PCI_VDEVICE(AMD, 0x7901), board_ahci_mobile }, /* AMD Green Sardine */

Aren’t 0x7900 and 0x7901 the same device only in different modes? I 
wonder, why different boards and different comments are used.

Additionally, the device 0x7901 is also present in desktop systems like 
Dell OptiPlex 5055 and MSI B350 MORTAR. Is `board_ahci_mobile` the right 
board then? Or should the flag `AHCI_HFLAG_IS_MOBILE` be renamed to 
avoid confusion?

>   	/* 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 },


Kind regards,

Paul