linux-kernel - Re: [PATCH v1 1/3] platform/x86/amd/pmc: Add support for Van Gogh SoC

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Message-ID: <3792db59-7dc1-4e34-9436-84df4b6c3e10@amd.com>
Date: Fri, 24 Oct 2025 10:43:50 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Antheas Kapenekakis <lkml@...heas.dev>,
 Alex Deucher <alexander.deucher@....com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>, Perry Yuan <perry.yuan@....com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v1 1/3] platform/x86/amd/pmc: Add support for Van Gogh SoC



On 10/24/2025 10:21 AM, Antheas Kapenekakis wrote:
> The ROG Xbox Ally (non-X) SoC features a similar architecture to the
> Steam Deck. While the Steam Deck supports S3 (s2idle causes a crash),
> this support was dropped by the Xbox Ally which only S0ix suspend.
> 
> Since the handler is missing here, this causes the device to not suspend
> and the AMD GPU driver to crash while trying to resume afterwards due to
> a power hang.
> 
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4659
> Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
> ---
>   drivers/platform/x86/amd/pmc/pmc.c | 3 +++
>   drivers/platform/x86/amd/pmc/pmc.h | 1 +
>   2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c
> index bd318fd02ccf..cae3fcafd4d7 100644
> --- a/drivers/platform/x86/amd/pmc/pmc.c
> +++ b/drivers/platform/x86/amd/pmc/pmc.c
> @@ -106,6 +106,7 @@ static void amd_pmc_get_ip_info(struct amd_pmc_dev *dev)
>   	switch (dev->cpu_id) {
>   	case AMD_CPU_ID_PCO:
>   	case AMD_CPU_ID_RN:
> +	case AMD_CPU_ID_VG:
>   	case AMD_CPU_ID_YC:
>   	case AMD_CPU_ID_CB:
>   		dev->num_ips = 12;
> @@ -517,6 +518,7 @@ static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
>   	case AMD_CPU_ID_PCO:
>   		return MSG_OS_HINT_PCO;
>   	case AMD_CPU_ID_RN:
> +	case AMD_CPU_ID_VG:
>   	case AMD_CPU_ID_YC:
>   	case AMD_CPU_ID_CB:
>   	case AMD_CPU_ID_PS:
> @@ -717,6 +719,7 @@ static const struct pci_device_id pmc_pci_ids[] = {
>   	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RV) },
>   	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_SP) },
>   	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_SHP) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_VG) },
>   	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) },
>   	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_ROOT) },
>   	{ }
> diff --git a/drivers/platform/x86/amd/pmc/pmc.h b/drivers/platform/x86/amd/pmc/pmc.h
> index 62f3e51020fd..fe3f53eb5955 100644
> --- a/drivers/platform/x86/amd/pmc/pmc.h
> +++ b/drivers/platform/x86/amd/pmc/pmc.h
> @@ -156,6 +156,7 @@ void amd_mp2_stb_deinit(struct amd_pmc_dev *dev);
>   #define AMD_CPU_ID_RN			0x1630
>   #define AMD_CPU_ID_PCO			AMD_CPU_ID_RV
>   #define AMD_CPU_ID_CZN			AMD_CPU_ID_RN
> +#define AMD_CPU_ID_VG			0x1645

Can you see if 0xF14 gives you a reasonable value for the idle mask if 
you add it to amd_pmc_idlemask_read()?  Make a new define for it though, 
it shouldn't use the same define as 0x1a platforms.

>   #define AMD_CPU_ID_YC			0x14B5
>   #define AMD_CPU_ID_CB			0x14D8
>   #define AMD_CPU_ID_PS			0x14E8