From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulf Hansson Subject: [PATCH v8 02/26] PM / Domains: Deal with multiple states but no governor in genpd Date: Wed, 20 Jun 2018 19:22:02 +0200 Message-ID: <20180620172226.15012-3-ulf.hansson@linaro.org> References: <20180620172226.15012-1-ulf.hansson@linaro.org> Return-path: In-Reply-To: <20180620172226.15012-1-ulf.hansson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: "Rafael J . Wysocki" , Sudeep Holla , Lorenzo Pieralisi , Mark Rutland , linux-pm@vger.kernel.org Cc: Kevin Hilman , Lina Iyer , Lina Iyer , Ulf Hansson , Rob Herring , Daniel Lezcano , Thomas Gleixner , Vincent Guittot , Stephen Boyd , Juri Lelli , Geert Uytterhoeven , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org A caller of pm_genpd_init() that provides some states for the genpd via the ->states pointer in the struct generic_pm_domain, should also provide a governor. This because it's the job of the governor to pick a state that satisfies the constraints. Therefore, let's print a warning to inform the user about such bogus configuration and avoid to bail out, by instead picking the shallowest state before genpd invokes the ->power_off() callback. Cc: Lina Iyer Signed-off-by: Ulf Hansson Reviewed-by: Lina Iyer --- drivers/base/power/domain.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 62969c3d5d04..21d298e1820b 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -467,6 +467,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, return -EAGAIN; } + /* Default to shallowest state. */ + if (!genpd->gov) + genpd->state_idx = 0; + if (genpd->power_off) { int ret; @@ -1687,6 +1691,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd, ret = genpd_set_default_power_state(genpd); if (ret) return ret; + } else if (!gov) { + pr_warn("%s : no governor for states\n", genpd->name); } device_initialize(&genpd->dev); -- 2.17.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: ulf.hansson@linaro.org (Ulf Hansson) Date: Wed, 20 Jun 2018 19:22:02 +0200 Subject: [PATCH v8 02/26] PM / Domains: Deal with multiple states but no governor in genpd In-Reply-To: <20180620172226.15012-1-ulf.hansson@linaro.org> References: <20180620172226.15012-1-ulf.hansson@linaro.org> Message-ID: <20180620172226.15012-3-ulf.hansson@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org A caller of pm_genpd_init() that provides some states for the genpd via the ->states pointer in the struct generic_pm_domain, should also provide a governor. This because it's the job of the governor to pick a state that satisfies the constraints. Therefore, let's print a warning to inform the user about such bogus configuration and avoid to bail out, by instead picking the shallowest state before genpd invokes the ->power_off() callback. Cc: Lina Iyer Signed-off-by: Ulf Hansson Reviewed-by: Lina Iyer --- drivers/base/power/domain.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 62969c3d5d04..21d298e1820b 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -467,6 +467,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, return -EAGAIN; } + /* Default to shallowest state. */ + if (!genpd->gov) + genpd->state_idx = 0; + if (genpd->power_off) { int ret; @@ -1687,6 +1691,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd, ret = genpd_set_default_power_state(genpd); if (ret) return ret; + } else if (!gov) { + pr_warn("%s : no governor for states\n", genpd->name); } device_initialize(&genpd->dev); -- 2.17.1