[PATCH v2 00/12] Fixes for apple-gmux and runtime support

[Atharva Tiwari]

This series fixes apple-gmux on T2 Macs (2018-2020):

  - Fix interrupt handling
  - Automatically turn on dGPU when a external monitor connects.
  - Fix base register read/write
  - Fix power handling
  - Improve documentation
  - New module parameter to toggle boot GPU.

It also adds vga_switcheroo runtime power management for T2 Macs, built
on gmux power control, so the dGPU is powered off automatically when
idle and users no longer need to toggle it manually.

Changes in v2:
- Check the discrete pdev config before GFX0 restore (01/13)
- Don't save bridges state when state is VGA_SWITCHEROO_OFF (01/13)
- Fixes discrete_pdev initialization (01/13)
- Used PWRD on 15,1 and 15,3 aswell
- Add quirk to 0x7360 PCI id aswell (02/13)
- Add 15,1 and 15,3 and its gpu's aswell
- Removed ignore_access code (02/13)
- Initialized val in read functions (03/13)
- Fixed permanent mutex block on failure (03/13)
- Only resumed when pm_runtime is available (skipping on iMacs) (04/13)
- Corrected ordering of interrupt_work (04/13)
- Notified drm about hotplug change (04/13)
- Checked if EFI_RT_SUPPORTED_SET_VARIABLE is available before writing
  gpu-active (05/13)
- Wrote gpu-active on shutdown aswell (05/13)
- Dropped boot-gpu parameter (06/13)
- Checked if vga_switcheroo has been initialized (09/13)
- Added additional pci_is_thunderbolt_attached check to
  amdgpu_device_supports_gmux (09/13)
- Removed duplicate check (10/13)
- Renamed gmux_off to runpm_active
- Checked if adev->dev exists in dm_dp_aux_transfer to fix null ptr
  deref (11/13)
- Removed GMUX specific code (12/13)
- Initialized edp_sink_present in testing code (13/13)

Link to v1:
https://lore.kernel.org/all/20261025040046.1602-1-atharvatiwarilinuxdev@xxxxxxxxx/

Andre Eikmeyer (6):
  platform/apple-gmux: Write switch state to EFI on MMIO devices
  drm/amdgpu: Add Apple GMUX runtime PM support
  drm/amdgpu: Catch register access while GMUX keeps the GPU off
  drm/amd/display: Refuse DP AUX while GMUX keeps the GPU off
  drm/amdgpu: Skip AC/DC notification while the GPU is runtime suspended
  drm/amd/display: Skip panel power savings on eDP links without a panel

Atharva Tiwari (6):
  platform/apple-gmux: Fix power for MMIO systems
  PCI: Disable pcie port on specific amd devices
  platform/apple-gmux: Fix MMIO interface
  platform/apple-gmux: Fix Interrupts for MMIO systems
  platform/apple-gmux: Add check to detect FSS
  platform/apple-gmux: Add documentation about iMacs

 arch/x86/pci/fixup.c                          |  43 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |   3 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |  61 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  48 ++-
 .../gpu/drm/amd/amdgpu/amdgpu_reg_access.c    |  24 ++
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  14 +
 .../display/amdgpu_dm/amdgpu_dm_backlight.c   |   3 +
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  19 +-
 .../tests/amdgpu_dm_backlight_test.c          |   1 +
 drivers/gpu/drm/amd/pm/amdgpu_dpm.c           |  19 +-
 drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h       |   1 +
 drivers/pci/pcie/portdrv.c                    |   2 +-
 drivers/platform/x86/Kconfig                  |   1 +
 drivers/platform/x86/apple-gmux.c             | 365 +++++++++++++++---
 include/linux/apple-gmux.h                    |   1 +
 include/linux/pci.h                           |   1 +
 16 files changed, 534 insertions(+), 72 deletions(-)

-- 
2.55.0