This patch gets minor improvement on glmark2 (160->162).
Seems there's no way for user to change this value, do we? Or there's work pending to expose it to sysfs?
Regards, Qiang
On Thu, Jan 28, 2021 at 3:40 AM Christian Hewitt christianshewitt@gmail.com wrote:
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-...
Signed-off-by: Christian Hewitt christianshewitt@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.luba@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