This is an attempt at fixing amd#2295 [1]: On an AMD Rembrandt laptop with 680M iGPU and 6700S dGPU, calling vkEnumeratePhysicalDevices() wakes up the sleeping dGPU, even if all the application wants is to find and use the iGPU. This causes a delay of about 2 seconds on this system, followed by a few seconds of increased power draw until runtime PM turns the dGPU back off again.
[1] https://gitlab.freedesktop.org/drm/amd/-/issues/2295 Patch 1 avoids power up on some ioctls that don't need it. Patch 2 avoids power up on open() by postponing fpriv initialization to the first ioctl() that wakes up the dGPU. Patches 3 and 4 add AMDGPU_INFO to the list of non-waking ioctls, returning cached values for some queries. Patch 5 works around an explicit register access from libdrm. Patch 6 shorts out the syncobj ioctls while fpriv is still uninitialized. This avoids waking up the dGPU during Vulkan syncobj feature detection. regards Philipp Signed-off-by: Philipp Zabel <p.za...@pengutronix.de> --- Alex Deucher (1): drm/amdgpu: don't wake up the GPU for some IOCTLs Philipp Zabel (5): drm/amdgpu: don't wake up the GPU when opening the device drm/amdgpu: don't query xclk in AMDGPU_INFO_DEV_INFO drm/amdgpu: don't wake up the GPU for some AMDGPU_INFO queries drm/amdgpu: don't wake up the GPU for mmGB_ADDR_CONFIG register read drm/amdgpu: don't wake up the GPU for syncobj feature detection drivers/gpu/drm/amd/amdgpu/amdgpu.h | 5 + drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 3 + drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 + drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 80 +++++++++++++++- drivers/gpu/drm/amd/amdgpu/amdgpu_fdinfo.c | 3 + drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 137 +++++++++++++++++++++------- 6 files changed, 194 insertions(+), 36 deletions(-) --- base-commit: 6ac55eab4fc41e0ea80f9064945e4340f13d8b5c change-id: 20250730-b4-dont-wake-next-17fc02114331 Best regards, -- Philipp Zabel <philipp.za...@gmail.com>
