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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
16 lines
490 B
Text
16 lines
490 B
Text
# SPDX-License-Identifier: GPL-2.0 OR MIT
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# Copyright 2017-2019 Qiang Yu <yuq825@gmail.com>
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config DRM_LIMA
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tristate "LIMA (DRM support for ARM Mali 400/450 GPU)"
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depends on DRM
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depends on ARM || ARM64 || COMPILE_TEST
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depends on MMU
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depends on COMMON_CLK
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depends on OF
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select DRM_SCHED
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select DRM_GEM_SHMEM_HELPER
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select PM_DEVFREQ
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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help
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DRM driver for ARM Mali 400/450 GPUs.
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