| Message ID | 20200819125925.2119434-1-aford173@gmail.com |
|---|---|
| State | Accepted |
| Commit | 5093402e5b449b64f7bbaa09057ce40a8f3c1484 |
| Headers | show |
| Series | [V2,1/2] thermal: ti-soc-thermal: Enable addition power management | expand |
On 10/09/2020 20:01, Andreas Kemnade wrote: > On Wed, 19 Aug 2020 07:59:23 -0500 > Adam Ford <aford173@gmail.com> wrote: > >> 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 <aford173@gmail.com> >> Reported-by: kernel test robot <lkp@intel.com> >> --- >> V2: Fix issue where variable stating the suspend mode isn't being >> properly set and cleared. >> > hmm, it is not in linux-next. Can we expect that for v5.10? The reason I did not pick this patch is because lkp reported an error on it. https://marc.info/?l=linux-pm&m=159788472017308&w=2
On Thu, 10 Sep 2020 14:33:13 -0500 Adam Ford <aford173@gmail.com> wrote: > On Thu, Sep 10, 2020 at 2:14 PM Daniel Lezcano <daniel.lezcano@linaro.org> > wrote: > > > On 10/09/2020 20:01, Andreas Kemnade wrote: > > > On Wed, 19 Aug 2020 07:59:23 -0500 > > > Adam Ford <aford173@gmail.com> wrote: > > > > > >> 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 <aford173@gmail.com> > > >> Reported-by: kernel test robot <lkp@intel.com> > > >> --- > > >> V2: Fix issue where variable stating the suspend mode isn't being > > >> properly set and cleared. > > >> > > > hmm, it is not in linux-next. Can we expect that for v5.10? > > > > The reason I did not pick this patch is because lkp reported an error on > > it. > > > > https://marc.info/?l=linux-pm&m=159788472017308&w=2 > > > > > > > That error message shows it's trying to be built with 'sh' cross compiler, > but should be build with an ARM. > > I can run a manual test of the patch against a different branch if > necessary, but I had built and tested it, so I know it worked at one time. > hmm, what about compile-testing without CONFIG_PM_SLEEP? The function definition is guarded by that. So it is not a sh-specific problem. Regards, Andreas
diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c index ab19ceff6e2a..9404631bea4d 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c @@ -25,10 +25,18 @@ #include <linux/of_platform.h> #include <linux/of_irq.h> #include <linux/io.h> +#include <linux/cpu_pm.h> +#include <linux/device.h> +#include <linux/pm_runtime.h> +#include <linux/pm.h> +#include <linux/of.h> +#include <linux/of_device.h> #include "ti-bandgap.h" static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id); +static int bandgap_omap_cpu_notifier(struct notifier_block *nb, + unsigned long cmd, void *v); /*** Helper functions to access registers and their bitfields ***/ @@ -1008,6 +1016,9 @@ int ti_bandgap_probe(struct platform_device *pdev) } } + bgp->nb.notifier_call = bandgap_omap_cpu_notifier; + cpu_pm_register_notifier(&bgp->nb); + return 0; remove_last_cooling: @@ -1041,7 +1052,9 @@ 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 +1163,43 @@ 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 +1208,7 @@ 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 <linux/spinlock.h> #include <linux/types.h> #include <linux/err.h> +#include <linux/cpu_pm.h> +#include <linux/device.h> +#include <linux/pm_runtime.h> +#include <linux/pm.h> 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; }; /**
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 <aford173@gmail.com> Reported-by: kernel test robot <lkp@intel.com> --- V2: Fix issue where variable stating the suspend mode isn't being properly set and cleared.