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.l...@arm.com/ Signed-off-by: Christian Hewitt <christianshew...@gmail.com> --- Change since v1: increased upthreshold from 20 to 30, with a soft dependency on Lukasz delayed timer patch [0] [0] https://lore.kernel.org/lkml/20210127105121.20345-1-lukasz.l...@arm.com/ drivers/gpu/drm/lima/lima_devfreq.c | 10 +++++++++- drivers/gpu/drm/lima/lima_devfreq.h | 2 ++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c index 5686ad4aaf7c..c9854315a0b5 100644 --- a/drivers/gpu/drm/lima/lima_devfreq.c +++ b/drivers/gpu/drm/lima/lima_devfreq.c @@ -163,8 +163,16 @@ 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); diff --git a/drivers/gpu/drm/lima/lima_devfreq.h b/drivers/gpu/drm/lima/lima_devfreq.h index 2d9b3008ce77..b0c7c736e81a 100644 --- a/drivers/gpu/drm/lima/lima_devfreq.h +++ b/drivers/gpu/drm/lima/lima_devfreq.h @@ -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; -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
