summaryrefslogtreecommitdiff
path: root/drivers/thermal
diff options
context:
space:
mode:
authorAdam Ford <aford173@gmail.com>2020-09-11 07:31:56 -0500
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-10-12 12:08:36 +0200
commit5093402e5b449b64f7bbaa09057ce40a8f3c1484 (patch)
tree2d5dcd44d19b8d9f8bdb03d59afd2220f355f715 /drivers/thermal
parent92ad897302d6335aa40984bef15079d0235dce40 (diff)
thermal: ti-soc-thermal: Enable addition power management
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> Tested-by: Andreas Kemnade <andreas@kemnade.info> # GTA04 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200911123157.759379-1-aford173@gmail.com
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/ti-soc-thermal/ti-bandgap.c54
-rw-r--r--drivers/thermal/ti-soc-thermal/ti-bandgap.h6
2 files changed, 59 insertions, 1 deletions
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 <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);
+#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 <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;
};
/**