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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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41
drivers/gpu/drm/lima/lima_devfreq.h Normal file
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/* 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