From: Lukasz Luba <lukasz.luba@arm.com> To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, linux-arm-kernel@lists.infradead.org, sboyd@kernel.org, nm@ti.com, linux-samsung-soc@vger.kernel.org, daniel.lezcano@linaro.org, rafael@kernel.org, viresh.kumar@linaro.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, m.szyprowski@samsung.com, mhiramat@kernel.org Subject: [PATCH v2 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Date: Fri, 22 Mar 2024 10:32:21 +0000 [thread overview] Message-ID: <20240322103221.47594-5-lukasz.luba@arm.com> (raw) In-Reply-To: <20240322103221.47594-1-lukasz.luba@arm.com> 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. Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- drivers/soc/samsung/exynos-asv.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c index d60af8acc3916..bd6bb2cab2cd8 100644 --- a/drivers/soc/samsung/exynos-asv.c +++ b/drivers/soc/samsung/exynos-asv.c @@ -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 +98,17 @@ 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) { + /* + * When the voltage for OPPs successfully + * changed, update the EM power values to + * reflect the reality and not use stale data + */ + 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); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Lukasz Luba <lukasz.luba@arm.com> To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, linux-arm-kernel@lists.infradead.org, sboyd@kernel.org, nm@ti.com, linux-samsung-soc@vger.kernel.org, daniel.lezcano@linaro.org, rafael@kernel.org, viresh.kumar@linaro.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, m.szyprowski@samsung.com, mhiramat@kernel.org Subject: [PATCH v2 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Date: Fri, 22 Mar 2024 10:32:21 +0000 [thread overview] Message-ID: <20240322103221.47594-5-lukasz.luba@arm.com> (raw) In-Reply-To: <20240322103221.47594-1-lukasz.luba@arm.com> 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. Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- drivers/soc/samsung/exynos-asv.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c index d60af8acc3916..bd6bb2cab2cd8 100644 --- a/drivers/soc/samsung/exynos-asv.c +++ b/drivers/soc/samsung/exynos-asv.c @@ -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 +98,17 @@ 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) { + /* + * When the voltage for OPPs successfully + * changed, update the EM power values to + * reflect the reality and not use stale data + */ + 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); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2024-03-22 10:32 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-03-22 10:32 [PATCH v2 0/4] Update Energy Model after chip binning adjusted voltages Lukasz Luba 2024-03-22 10:32 ` Lukasz Luba 2024-03-22 10:32 ` [PATCH v2 1/4] OPP: OF: Export dev_opp_pm_calc_power() for usage from EM Lukasz Luba 2024-03-22 10:32 ` Lukasz Luba 2024-03-22 10:32 ` [PATCH v2 2/4] PM: EM: Change the em_adjust_new_capacity() to re-use code Lukasz Luba 2024-03-22 10:32 ` Lukasz Luba 2024-03-22 10:32 ` [PATCH v2 3/4] PM: EM: Add em_dev_update_chip_binning() Lukasz Luba 2024-03-22 10:32 ` Lukasz Luba 2024-03-22 10:32 ` Lukasz Luba [this message] 2024-03-22 10:32 ` [PATCH v2 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Lukasz Luba 2024-03-22 11:06 ` [PATCH v2 0/4] Update Energy Model after chip binning adjusted voltages Lukasz Luba 2024-03-22 11:06 ` Lukasz Luba
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