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drm/imagination: Implement power management

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Add power management to the driver, using runtime pm. The power off
sequence depends on firmware commands which are not implemented in this
patch.

Changes since v8:
- Corrected license identifiers

Changes since v5:
- Use RUNTIME_PM_OPS() to declare PM callbacks
- Add Kconfig dependency on CONFIG_PM

Changes since v4:
- Suspend runtime PM before unplugging device on rmmod

Changes since v3:
- Don't power device when calling pvr_device_gpu_fini()
- Documentation for pvr_dev->lost has been improved
- pvr_power_init() renamed to pvr_watchdog_init()
- Use drm_dev_{enter,exit}

Changes since v2:
- Use runtime PM
- Implement watchdog

Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/e09af4ef1ff514e1d6d7f97c7c5032c643c56f9c.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Sarah Walker
2023-11-22 16:34:33 +00:00
committed by Maxime Ripard
parent ff5f643de0
commit 727538a4bb
7 changed files with 375 additions and 4 deletions
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1
drivers/gpu/drm/imagination/Kconfig
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@@ -5,6 +5,7 @@ config DRM_POWERVR
tristate "Imagination Technologies PowerVR (Series 6 and later) & IMG Graphics"
depends on ARM64
depends on DRM
depends on PM
select DRM_GEM_SHMEM_HELPER
select DRM_SCHED
select DRM_GPUVM