linux-kernel - Re: [PATCH 2/2] ACPI: PM: Include alternate AMDI0005 id in special behaviour

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Date:   Mon, 11 Oct 2021 15:47:32 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Sachi King <nakato@...ato.io>, Shyam-sundar.S-k@....com,
        mgross@...ux.intel.com, mario.limonciello@....com,
        rafael@...nel.org, lenb@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] ACPI: PM: Include alternate AMDI0005 id in special
 behaviour

Hi,

On 10/2/21 6:18 AM, Sachi King wrote:
> The Surface Laptop 4 AMD has used the AMD0005 to identify this
> controller instead of using the appropriate ACPI ID AMDI0005.  The
> AMD0005 needs the same special casing as AMDI0005.
> 
> Cc: <stable@...r.kernel.org> # 5.14+
> Signed-off-by: Sachi King <nakato@...ato.io>

Rafael, I assume that you will pick up this one?  Please add the
following tags from other parts of the thread:

Link: https://github.com/linux-surface/acpidumps/tree/master/surface_laptop_4_amd
Link: https://gist.github.com/nakato/2a1a7df1a45fe680d7a08c583e1bf863
Reviewed-by: Mario Limonciello <mario.limonciello@....com>

Regards,

Hans



> ---
>  drivers/acpi/x86/s2idle.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
> index bd92b549fd5a..1c48358b43ba 100644
> --- a/drivers/acpi/x86/s2idle.c
> +++ b/drivers/acpi/x86/s2idle.c
> @@ -371,7 +371,7 @@ static int lps0_device_attach(struct acpi_device *adev,
>  		return 0;
>  
>  	if (acpi_s2idle_vendor_amd()) {
> -		/* AMD0004, AMDI0005:
> +		/* AMD0004, AMD0005, AMDI0005:
>  		 * - Should use rev_id 0x0
>  		 * - function mask > 0x3: Should use AMD method, but has off by one bug
>  		 * - function mask = 0x3: Should use Microsoft method
> @@ -390,6 +390,7 @@ static int lps0_device_attach(struct acpi_device *adev,
>  					ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
>  					&lps0_dsm_guid_microsoft);
>  		if (lps0_dsm_func_mask > 0x3 && (!strcmp(hid, "AMD0004") ||
> +						 !strcmp(hid, "AMD0005") ||
>  						 !strcmp(hid, "AMDI0005"))) {
>  			lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
>  			acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
>