An external Thunderbolt GPU can neither drive the laptop's panel nor be powered off by the platform, so there's no point in registering it with vga_switcheroo. In fact, when the external GPU is runtime suspended, vga_switcheroo will cut power to the internal discrete GPU, resulting in a lockup. Cc: Alex Deucher <alexander.deucher at amd.com> Signed-off-by: Lukas Wunner <lukas at wunner.de> --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 +++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 3 ++- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 944ba0d3874a..99d73504e56d 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -1759,7 +1759,9 @@ int amdgpu_device_init(struct amdgpu_device *adev, runtime = true; if (amdgpu_device_is_px(ddev)) runtime = true; - vga_switcheroo_register_client(adev->pdev, &amdgpu_switcheroo_ops, runtime); + if (!pci_is_thunderbolt_attached(adev->pdev)) + vga_switcheroo_register_client(adev->pdev, + &amdgpu_switcheroo_ops, runtime); if (runtime) vga_switcheroo_init_domain_pm_ops(adev->dev, &adev->vga_pm_domain); @@ -1922,7 +1924,8 @@ void amdgpu_device_fini(struct amdgpu_device *adev) amdgpu_atombios_fini(adev); kfree(adev->bios); adev->bios = NULL; - vga_switcheroo_unregister_client(adev->pdev); + if (!pci_is_thunderbolt_attached(adev->pdev)) + vga_switcheroo_unregister_client(adev->pdev); if (adev->flags & AMD_IS_PX) vga_switcheroo_fini_domain_pm_ops(adev->dev); vga_client_register(adev->pdev, NULL, NULL, NULL); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c index 61d94c745672..2f3b236721c9 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c @@ -103,7 +103,8 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags) amdgpu_has_atpx() && (amdgpu_is_atpx_hybrid() || amdgpu_has_atpx_dgpu_power_cntl()) && - ((flags & AMD_IS_APU) == 0)) + ((flags & AMD_IS_APU) == 0) && + !pci_is_thunderbolt_attached(dev->pdev)) flags |= AMD_IS_PX; /* amdgpu_device_init should report only fatal error -- 2.11.0
