kevin/linux
1
Fork 0
Code

soc: samsung: exynos-asv: Update Energy Model after adjusting voltage

Browse Source 
When the voltage for OPPs is adjusted there is a need to also update
Energy Model framework. The EM data contains power values which depend
on voltage values. The EM structure is used for thermal (IPA governor)
and in scheduler task placement (EAS) so it should reflect the real HW
model as best as possible to operate properly.

Based on data on Exynos5422 ASV tables the maximum power difference might
be ~29%. An Odroid-XU4 (with a random sample SoC in this chip lottery)
showed power difference for some OPPs ~20%. Therefore, it's worth to
update the EM.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2024-04-03 16:49:07 +01:00 committed by Rafael J. Wysocki
parent cf61d53b02
commit a5bb5e0877
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/soc/samsung/exynos-asv.c
View File

@ -11,6 +11,7 @@
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/energy_model.h>
#include <linux/errno.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
@ -97,9 +98,16 @@ static int exynos_asv_update_opps(struct exynos_asv *asv)
last_opp_table = opp_table;
ret = exynos_asv_update_cpu_opps(asv, cpu);
if (ret < 0)
if (!ret) {
/*
* Update EM power values since OPP
* voltage values may have changed.
*/
em_dev_update_chip_binning(cpu);
} else {
dev_err(asv->dev, "Couldn't udate OPPs for cpu%d\n",
cpuid);
}
}
dev_pm_opp_put_opp_table(opp_table);