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

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Message-ID: <20251024152152.3981721-2-lkml@antheas.dev>
Date: Fri, 24 Oct 2025 17:21:50 +0200
From: Antheas Kapenekakis <lkml@...heas.dev>
To: Alex Deucher <alexander.deucher@....com>,
	Shyam Sundar S K <Shyam-sundar.S-k@....com>,
	Mario Limonciello <mario.limonciello@....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,
	Antheas Kapenekakis <lkml@...heas.dev>
Subject: [PATCH v1 1/3] platform/x86/amd/pmc: Add support for Van Gogh SoC

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
 #define AMD_CPU_ID_YC			0x14B5
 #define AMD_CPU_ID_CB			0x14D8
 #define AMD_CPU_ID_PS			0x14E8
-- 
2.51.0