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[68.232.239.6]) by smtp.gmail.com with ESMTPSA id m18sm1144277iln.80.2020.09.11.05.32.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 05:32:08 -0700 (PDT) From: Adam Ford To: linux-pm@vger.kernel.org, linux-omap@vger.kernel.org Cc: aford@beaconembedded.com, Adam Ford , kernel test robot , Andreas Kemnade , Tony Lindgren , Russell King , Eduardo Valentin , Keerthy , Zhang Rui , Daniel Lezcano , Amit Kucheria , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] thermal: ti-soc-thermal: Enable addition power management Date: Fri, 11 Sep 2020 07:31:56 -0500 Message-Id: <20200911123157.759379-1-aford173@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org The bandgap sensor can be idled when the processor is too, but it isn't currently being done, so the power consumption of OMAP3 boards can elevated if the bangap sensor is enabled. This patch attempts to use some additional power management to idle the clock to the bandgap when not needed. Signed-off-by: Adam Ford Reported-by: kernel test robot Tested-by: Andreas Kemnade # GTA04 --- V3: bandgap_omap_cpu_notifier is only defined when CONFIG_PM_SLEEP is enabled, so make all references to it also depend on CONFIG_PM_SLEEP as well V2: Fix issue where variable stating the suspend mode isn't being properly set and cleared. diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c index ab19ceff6e2a..5e596168ba73 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c @@ -25,10 +25,20 @@ #include #include #include +#include +#include +#include +#include +#include +#include #include "ti-bandgap.h" static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id); +#ifdef CONFIG_PM_SLEEP +static int bandgap_omap_cpu_notifier(struct notifier_block *nb, + unsigned long cmd, void *v); +#endif /*** Helper functions to access registers and their bitfields ***/ @@ -1008,6 +1018,11 @@ int ti_bandgap_probe(struct platform_device *pdev) } } +#ifdef CONFIG_PM_SLEEP + bgp->nb.notifier_call = bandgap_omap_cpu_notifier; + cpu_pm_register_notifier(&bgp->nb); +#endif + return 0; remove_last_cooling: @@ -1041,7 +1056,9 @@ int ti_bandgap_remove(struct platform_device *pdev) struct ti_bandgap *bgp = platform_get_drvdata(pdev); int i; - /* First thing is to remove sensor interfaces */ + cpu_pm_unregister_notifier(&bgp->nb); + + /* Remove sensor interfaces */ for (i = 0; i < bgp->conf->sensor_count; i++) { if (bgp->conf->sensors[i].unregister_cooling) bgp->conf->sensors[i].unregister_cooling(bgp, i); @@ -1150,9 +1167,43 @@ static int ti_bandgap_suspend(struct device *dev) if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) clk_disable_unprepare(bgp->fclock); + bgp->is_suspended = true; + return err; } +static int bandgap_omap_cpu_notifier(struct notifier_block *nb, + unsigned long cmd, void *v) +{ + struct ti_bandgap *bgp; + + bgp = container_of(nb, struct ti_bandgap, nb); + + spin_lock(&bgp->lock); + switch (cmd) { + case CPU_CLUSTER_PM_ENTER: + if (bgp->is_suspended) + break; + ti_bandgap_save_ctxt(bgp); + ti_bandgap_power(bgp, false); + if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) + clk_disable(bgp->fclock); + break; + case CPU_CLUSTER_PM_ENTER_FAILED: + case CPU_CLUSTER_PM_EXIT: + if (bgp->is_suspended) + break; + if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) + clk_enable(bgp->fclock); + ti_bandgap_power(bgp, true); + ti_bandgap_restore_ctxt(bgp); + break; + } + spin_unlock(&bgp->lock); + + return NOTIFY_OK; +} + static int ti_bandgap_resume(struct device *dev) { struct ti_bandgap *bgp = dev_get_drvdata(dev); @@ -1161,6 +1212,7 @@ static int ti_bandgap_resume(struct device *dev) clk_prepare_enable(bgp->fclock); ti_bandgap_power(bgp, true); + bgp->is_suspended = false; return ti_bandgap_restore_ctxt(bgp); } diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.h b/drivers/thermal/ti-soc-thermal/ti-bandgap.h index fce4657e9486..ed0ea4b17b25 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.h +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.h @@ -12,6 +12,10 @@ #include #include #include +#include +#include +#include +#include struct gpio_desc; @@ -203,6 +207,8 @@ struct ti_bandgap { int irq; struct gpio_desc *tshut_gpiod; u32 clk_rate; + struct notifier_block nb; + unsigned int is_suspended:1; }; /**