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drm/lima: add governor data with pre-defined thresholds

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This patch adapts the panfrost pre-defined thresholds change [0] to the
lima driver to improve real-world performance. The upthreshold value has
been set to ramp GPU frequency to max freq faster (compared to panfrost)
to compensate for the lower overall performance of utgard devices.

[0] https://patchwork.kernel.org/project/dri-devel/patch/20210121170445.19761-1-lukasz.luba@arm.com/

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210127194047.21462-1-christianshewitt@gmail.com
This commit is contained in:
Christian Hewitt 2021-01-27 19:40:47 +00:00 • committed by Qiang Yu
parent 904beebb3e
commit 1d048afe7e
2 changed files with 11 additions and 1 deletions
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10
drivers/gpu/drm/lima/lima_devfreq.c
View file

@ -164,8 +164,16 @@ int lima_devfreq_init(struct lima_device *ldev)
lima_devfreq_profile.initial_freq = cur_freq;
dev_pm_opp_put(opp);
/*
* Setup default thresholds for the simple_ondemand governor.
* The values are chosen based on experiments.
*/
ldevfreq->gov_data.upthreshold = 30;
ldevfreq->gov_data.downdifferential = 5;
devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile,
DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
DEVFREQ_GOV_SIMPLE_ONDEMAND,
&ldevfreq->gov_data);
if (IS_ERR(devfreq)) {
dev_err(dev, "Couldn't initialize GPU devfreq\n");
ret = PTR_ERR(devfreq);

2
drivers/gpu/drm/lima/lima_devfreq.h
View file

@ -4,6 +4,7 @@
#ifndef __LIMA_DEVFREQ_H__
#define __LIMA_DEVFREQ_H__
#include <linux/devfreq.h>
#include <linux/spinlock.h>
#include <linux/ktime.h>
@ -18,6 +19,7 @@ struct lima_devfreq {
struct opp_table *clkname_opp_table;
struct opp_table *regulators_opp_table;
struct thermal_cooling_device *cooling;
struct devfreq_simple_ondemand_data gov_data;
ktime_t busy_time;
ktime_t idle_time;