From: Mario Limonciello Date: Thu, 9 Jul 2026 03:15:20 +0000 (-0500) Subject: drm/amdgpu: Disable PCIe dynamic speed switching on Ryzen Pinnacle Ridge X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0148ac33547b9af1c5a7f3bb6e5baffcb6e9fac2;p=thirdparty%2Fkernel%2Flinux.git drm/amdgpu: Disable PCIe dynamic speed switching on Ryzen Pinnacle Ridge 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: 466a7d115326 ("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 Link: https://patch.msgid.link/20260709031520.841611-1-mario.limonciello@amd.com Signed-off-by: Mario Limonciello Signed-off-by: Alex Deucher (cherry picked from commit 9ceb4e034a327a04155f32f1cd1a5031dfa5fe02) Cc: stable@vger.kernel.org --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 53335ca96b1d..e5f26e5892ba 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -1323,6 +1323,15 @@ 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; }