1996970773
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
42 lines
1012 B
C
42 lines
1012 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> */
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#ifndef __LIMA_DEVFREQ_H__
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#define __LIMA_DEVFREQ_H__
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#include <linux/spinlock.h>
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#include <linux/ktime.h>
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struct devfreq;
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struct opp_table;
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struct thermal_cooling_device;
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struct lima_device;
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struct lima_devfreq {
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struct devfreq *devfreq;
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struct opp_table *clkname_opp_table;
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struct opp_table *regulators_opp_table;
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struct thermal_cooling_device *cooling;
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bool opp_of_table_added;
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ktime_t busy_time;
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ktime_t idle_time;
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ktime_t time_last_update;
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int busy_count;
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/*
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* Protect busy_time, idle_time, time_last_update and busy_count
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* because these can be updated concurrently, for example by the GP
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* and PP interrupts.
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*/
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spinlock_t lock;
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};
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int lima_devfreq_init(struct lima_device *ldev);
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void lima_devfreq_fini(struct lima_device *ldev);
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void lima_devfreq_record_busy(struct lima_devfreq *devfreq);
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void lima_devfreq_record_idle(struct lima_devfreq *devfreq);
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#endif
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