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drm/amdgpu: Disable PCIe dynamic speed switching on Ryzen Pinnacle Ridge

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AMD Ryzen Pinnacle Ridge (Zen+, family 0x17 model 0x08) CPUs have
PCI controllers that don't support PCIe dynamic speed switching,
causing system freezes during GPU initialization when enabled.

Disable dynamic speed switching when this CPU is detected.

Assisted-by: Claude:sonnet
Fixes: 466a7d1153 ("drm/amd: Use the first non-dGPU PCI device for BW limits")
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5436
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Link: https://patch.msgid.link/20260709031520.841611-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello
2026-07-08 22:15:20 -05:00
committed by Alex Deucher
parent bc639a9ead
commit 9ceb4e034a
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -1222,6 +1222,15 @@ static bool amdgpu_device_pcie_dynamic_switching_supported(struct amdgpu_device
if (c->x86_vendor == X86_VENDOR_INTEL)
return false;
/*
* AMD Ryzen Pinnacle Ridge (Zen+, family 0x17 model 0x08) CPUs don't
* support PCIe dynamic speed switching.
* https://gitlab.freedesktop.org/drm/amd/-/work_items/5436
*/
if (c->x86_vendor == X86_VENDOR_AMD && c->x86 == 0x17 &&
c->x86_model == 0x08)
return false;
#endif
return true;
}