From: Lukasz Luba <lukasz.luba@arm.com> To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rafael@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, viresh.kumar@linaro.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, m.szyprowski@samsung.com, mhiramat@kernel.org Subject: [PATCH v5 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Date: Wed, 3 Apr 2024 16:49:07 +0100 [thread overview] Message-ID: <20240403154907.1420245-5-lukasz.luba@arm.com> (raw) In-Reply-To: <20240403154907.1420245-1-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. 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> --- drivers/soc/samsung/exynos-asv.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c index d60af8acc3916..97006cc3b9461 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 +98,16 @@ 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); -- 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, rafael@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, viresh.kumar@linaro.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, m.szyprowski@samsung.com, mhiramat@kernel.org Subject: [PATCH v5 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Date: Wed, 3 Apr 2024 16:49:07 +0100 [thread overview] Message-ID: <20240403154907.1420245-5-lukasz.luba@arm.com> (raw) In-Reply-To: <20240403154907.1420245-1-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. 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> --- drivers/soc/samsung/exynos-asv.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c index d60af8acc3916..97006cc3b9461 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 +98,16 @@ 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); -- 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:[~2024-04-03 15:49 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-03 15:49 [PATCH v5 0/4] Update Energy Model after chip binning adjusted voltages Lukasz Luba 2024-04-03 15:49 ` Lukasz Luba 2024-04-03 15:49 ` [PATCH v5 1/4] OPP: OF: Export dev_opp_pm_calc_power() for usage from EM Lukasz Luba 2024-04-03 15:49 ` Lukasz Luba 2024-04-03 15:49 ` [PATCH v5 2/4] PM: EM: Refactor em_adjust_new_capacity() Lukasz Luba 2024-04-03 15:49 ` Lukasz Luba 2024-04-03 15:49 ` [PATCH v5 3/4] PM: EM: Add em_dev_update_chip_binning() Lukasz Luba 2024-04-03 15:49 ` Lukasz Luba 2024-04-03 15:49 ` Lukasz Luba [this message] 2024-04-03 15:49 ` [PATCH v5 4/4] soc: samsung: exynos-asv: Update Energy Model after adjusting voltage Lukasz Luba 2024-04-08 14:06 ` [PATCH v5 0/4] Update Energy Model after chip binning adjusted voltages Rafael J. Wysocki 2024-04-08 14:06 ` Rafael J. Wysocki 2024-04-09 7:07 ` Lukasz Luba 2024-04-09 7:07 ` Lukasz Luba
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