Modernize vga_switcheroo by using a device link to enforce a runtime PM dependency from an HDA controller to the GPU it's integrated into, v2. Changes since v1: - Replace patch [1/7] to use pci_save_state() / pci_restore_state() for consistency between runtime PM code path of bound and unbound devices. (Rafael, Bjorn) - Patch [5/7]: Drop an unnecessary initialization. (Bjorn) Rephrase error message on failed link addition for clarity. Link to v1: https://www.spinics.net/lists/dri-devel/msg165889.html Testing on more machines would be greatly appreciated, particularly Nvidia Optimus or AMD PowerXpress. The series is based on 4.16-rc3. To test it on 4.15, you need to cherry-pick 7506dc798993 and 2fa6d6cdaf28. For your convenience I've pushed a 4.15-based branch to: https://github.com/l1k/linux/commits/switcheroo_devlink_v2 Minimal test procedure: - Note well: Recent Optimus require that a Mini-DP or HDMI cable is plugged in on boot for the HDA device to be present. - Check that HDA, GPU and root port autosuspend when not in use: cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status # HDA cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status # GPU cat /sys/bus/pci/devices/0000:00:01.0/power/runtime_status # Root Port - Check that all three autoresume when accessing the HDA: hdajacksensetest -c 1 - Unbind the HDA controller: echo 0000:01:00.1 > /sys/bus/pci/drivers/snd_hda_intel/unbind Wait for GPU to power off, then rebind the HDA controller: echo 0000:01:00.1 > /sys/bus/pci/drivers/snd_hda_intel/bind Check dmesg for errors, try accessing HDA with hdajacksensetest. - If your laptop uses the root port's _PR3 to cut power to the GPU: Unbind the GPU: echo 0000:01:00.0 > /sys/bus/pci/drivers/{nouveau,amdgpu,radeon}/unbind Allow runtime PM on the GPU: echo auto > /sys/bus/pci/devices/0000:01:00.0/power/control Wait for GPU to power off, then rebind it: echo 0000:01:00.0 > /sys/bus/pci/drivers/{nouveau,amdgpu,radeon}/bind Check dmesg for errors. If you see any then we may need to perform further actions in pci_pm_runtime_resume(), see patch [1/7]. Thanks, Lukas Lukas Wunner (6): PCI: Make pci_wakeup_bus() & pci_bus_set_current_state() public vga_switcheroo: Update PCI current_state on power change vga_switcheroo: Deduplicate power state tracking vga_switcheroo: Use device link for HDA controller vga_switcheroo: Let HDA autosuspend on mux change drm/nouveau: Runtime suspend despite HDA being unbound Rafael J. Wysocki (1): PCI: Restore config space on runtime resume despite being unbound drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 - drivers/gpu/drm/nouveau/nouveau_drm.c | 46 ---------- drivers/gpu/drm/nouveau/nouveau_drv.h | 1 - drivers/gpu/drm/radeon/radeon_drv.c | 2 - drivers/gpu/vga/vga_switcheroo.c | 152 ++++++++------------------------ drivers/pci/pci-driver.c | 17 ++-- drivers/pci/pci.c | 8 +- drivers/pci/quirks.c | 39 ++++++++ include/linux/pci.h | 2 + include/linux/pci_ids.h | 1 + include/linux/vga_switcheroo.h | 6 -- include/sound/hdaudio.h | 3 - sound/pci/hda/hda_intel.c | 36 +++++--- sound/pci/hda/hda_intel.h | 3 - 14 files changed, 117 insertions(+), 201 deletions(-) -- 2.15.1
