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drm/lima: Add optional devfreq and cooling device support

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Most platforms with a Mali-400 or Mali-450 GPU also have support for
changing the GPU clock frequency. Add devfreq support so the GPU clock
rate is updated based on the actual GPU usage when the
"operating-points-v2" property is present in the board.dts.

The actual devfreq code is taken from panfrost_devfreq.c and modified so
it matches what the lima hardware needs:
- a call to dev_pm_opp_set_clkname() during initialization because there
  are two clocks on Mali-4x0 IPs. "core" is the one that actually clocks
  the GPU so we need to control it using devfreq.
- locking when reading or writing the devfreq statistics because (unlike
  than panfrost) we have multiple PP and GP IRQs which may finish jobs
  concurrently.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200319203427.2259891-3-martin.blumenstingl@googlemail.com
This commit is contained in:
Martin Blumenstingl
2020-03-19 21:34:27 +01:00
committed by Qiang Yu
parent 6bb0942e8f
commit 1996970773
9 changed files with 308 additions and 3 deletions
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2
drivers/gpu/drm/lima/Kconfig
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@@ -10,5 +10,7 @@ config DRM_LIMA
depends on OF
select DRM_SCHED
select DRM_GEM_SHMEM_HELPER
select PM_DEVFREQ
select DEVFREQ_GOV_SIMPLE_ONDEMAND
help
DRM driver for ARM Mali 400/450 GPUs.