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drm/amdgpu: Don't register Thunderbolt eGPU with vga_switcheroo 

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.  Moreover AMD's Windows driver special-cases Thunderbolt as
well.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: http://patchwork.freedesktop.org/patch/msgid/701a8e89ce8ac39734736ab779558b6a4042a19e.1489145162.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2017-03-10 21:23:45 +01:00
parent 7ffb0ce31c
commit 84c8b22e9f
2 changed files with 7 additions and 3 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -1763,7 +1763,9 @@ 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);
@ -1926,7 +1928,8 @@ 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);

3
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
View File

@ -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