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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2020-03-19 21:34:27 +0100 |
|---|---|---|
| committer | Qiang Yu <yuq825@gmail.com> | 2020-03-28 16:29:46 +0800 |
| commit | 1996970773a323533e1cc1b6b97f00a95d675f32 (patch) | |
| tree | 15843b481458a6369712db5b6351e45f72ebfde5 /drivers/gpu/drm/lima/lima_devfreq.h | |
| parent | 6bb0942e8f46863a745489cce27efe5be2a3885e (diff) | |
| download | linux-1996970773a323533e1cc1b6b97f00a95d675f32.tar.gz linux-1996970773a323533e1cc1b6b97f00a95d675f32.tar.bz2 linux-1996970773a323533e1cc1b6b97f00a95d675f32.zip | |
drm/lima: Add optional devfreq and cooling device support
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
Diffstat (limited to 'drivers/gpu/drm/lima/lima_devfreq.h')
| -rw-r--r-- | drivers/gpu/drm/lima/lima_devfreq.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gpu/drm/lima/lima_devfreq.h b/drivers/gpu/drm/lima/lima_devfreq.h new file mode 100644 index 000000000000..8d71ba9fb22a --- /dev/null +++ b/drivers/gpu/drm/lima/lima_devfreq.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> */ + +#ifndef __LIMA_DEVFREQ_H__ +#define __LIMA_DEVFREQ_H__ + +#include <linux/spinlock.h> +#include <linux/ktime.h> + +struct devfreq; +struct opp_table; +struct thermal_cooling_device; + +struct lima_device; + +struct lima_devfreq { + struct devfreq *devfreq; + struct opp_table *clkname_opp_table; + struct opp_table *regulators_opp_table; + struct thermal_cooling_device *cooling; + bool opp_of_table_added; + + ktime_t busy_time; + ktime_t idle_time; + ktime_t time_last_update; + int busy_count; + /* + * Protect busy_time, idle_time, time_last_update and busy_count + * because these can be updated concurrently, for example by the GP + * and PP interrupts. + */ + spinlock_t lock; +}; + +int lima_devfreq_init(struct lima_device *ldev); +void lima_devfreq_fini(struct lima_device *ldev); + +void lima_devfreq_record_busy(struct lima_devfreq *devfreq); +void lima_devfreq_record_idle(struct lima_devfreq *devfreq); + +#endif |