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

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Message-ID: <2684d3ab-d7cf-4eab-acd4-91bdd5debb6b@amd.com>
Date: Fri, 24 Oct 2025 11:32:02 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Antheas Kapenekakis <lkml@...heas.dev>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: Alex Deucher <alexander.deucher@....com>, Perry Yuan
 <perry.yuan@....com>, 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 11:08 AM, Antheas Kapenekakis wrote:
> On Fri, 24 Oct 2025 at 17:43, Mario Limonciello
> <mario.limonciello@....com> wrote:
>>
>>
>>
>> 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.
> 
> It does not work. Reports 0. I also tested the other ones, but the
> 0x1a was the same as you said. All report 0x0.

It's possible the platform doesn't report an idle mask.

0xF14 is where I would have expected it to report.

Shyam - can you look into this to see if it's in a different place than 
0xF14 for Van Gogh?

> 
> Any idea why the OS hint only works 90% of the time?

If we get the idle mask reporting working we would have a better idea if 
that is what is reported wrong.

If I was to guess though; maybe GFX is still active.

Depending upon what's going wrong smu_fw_info might have some more 
information too.
> 
>>>    #define AMD_CPU_ID_YC                       0x14B5
>>>    #define AMD_CPU_ID_CB                       0x14D8
>>>    #define AMD_CPU_ID_PS                       0x14E8
>>
>>
>