drm/radeon: 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/72d8a9645aece3eff44e116303f0fec8be061c88.1489145162.git.lukas@wunner.de
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 4b0c388..27be17f 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1471,7 +1471,9 @@
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);
@@ -1564,7 +1566,8 @@
/* evict vram memory */
radeon_bo_evict_vram(rdev);
radeon_fini(rdev);
- vga_switcheroo_unregister_client(rdev->pdev);
+ 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);
vga_client_register(rdev->pdev, NULL, NULL, NULL);
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 56f35c0..e95ceec 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -115,7 +115,8 @@
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