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

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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/72d8a9645aece3eff44e116303f0fec8be061c88.1489145162.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2017-03-10 21:23:45 +01:00
parent 8531e283be
commit 7ffb0ce31c
2 changed files with 7 additions and 3 deletions
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5
drivers/gpu/drm/radeon/radeon_device.c
View File

@ -1471,7 +1471,9 @@ int radeon_device_init(struct radeon_device *rdev,
if (rdev->flags & RADEON_IS_PX)
runtime = true;
vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, runtime);
if (!pci_is_thunderbolt_attached(rdev->pdev))
vga_switcheroo_register_client(rdev->pdev,
&radeon_switcheroo_ops, runtime);
if (runtime)
vga_switcheroo_init_domain_pm_ops(rdev->dev, &rdev->vga_pm_domain);
@ -1564,6 +1566,7 @@ void radeon_device_fini(struct radeon_device *rdev)
/* evict vram memory */
radeon_bo_evict_vram(rdev);
radeon_fini(rdev);
if (!pci_is_thunderbolt_attached(rdev->pdev))
vga_switcheroo_unregister_client(rdev->pdev);
if (rdev->flags & RADEON_IS_PX)
vga_switcheroo_fini_domain_pm_ops(rdev->dev);

3
drivers/gpu/drm/radeon/radeon_kms.c
View File

@ -115,7 +115,8 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
if ((radeon_runtime_pm != 0) &&
radeon_has_atpx() &&
((flags & RADEON_IS_IGP) == 0))
((flags & RADEON_IS_IGP) == 0) &&
!pci_is_thunderbolt_attached(rdev->pdev))
flags |= RADEON_IS_PX;
/* radeon_device_init should report only fatal error