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thermal: ti-soc-thermal: Disable the CPU PM notifier for OMAP4430

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It has been observed that on OMAP4430 (ES2.0, ES2.1 and ES2.3) the enabled
notifier causes errors on the DTEMP readout values:

ti-soc-thermal 4a002260.bandgap: in range ADC val: 52
ti-soc-thermal 4a002260.bandgap: in range ADC val: 64
ti-soc-thermal 4a002260.bandgap: in range ADC val: 64
ti-soc-thermal 4a002260.bandgap: out of range ADC val: 0
thermal thermal_zone0: failed to read out thermal zone (-5)
ti-soc-thermal 4a002260.bandgap: out of range ADC val: 0
thermal thermal_zone0: failed to read out thermal zone (-5)
ti-soc-thermal 4a002260.bandgap: out of range ADC val: 4
thermal thermal_zone0: failed to read out thermal zone (-5)
ti-soc-thermal 4a002260.bandgap: in range ADC val: 100

raw 100 translates to 133 Celsius on omap4-sdp, triggering shutdown due to
critical temperature.

When the notifier is disable for OMAP4430 the DTEMP values are stable:
ti-soc-thermal 4a002260.bandgap: in range ADC val: 56
ti-soc-thermal 4a002260.bandgap: in range ADC val: 56
ti-soc-thermal 4a002260.bandgap: in range ADC val: 57
ti-soc-thermal 4a002260.bandgap: in range ADC val: 57
ti-soc-thermal 4a002260.bandgap: in range ADC val: 56

Fixes: 5093402e5b44 ("thermal: ti-soc-thermal: Enable addition power management")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201029100335.27665-1-peter.ujfalusi@ti.com
This commit is contained in:
Peter Ujfalusi 2020-10-29 12:03:35 +02:00 committed by Daniel Lezcano
parent f8394f232b
commit b98467fe96
1 changed files with 16 additions and 2 deletions
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18
drivers/thermal/ti-soc-thermal/ti-bandgap.c
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@ -20,6 +20,7 @@
#include <linux/err.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/sys_soc.h>
#include <linux/reboot.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
@ -864,6 +865,17 @@ static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
return bgp;
}
/*
* List of SoCs on which the CPU PM notifier can cause erros on the DTEMP
* readout.
* Enabled notifier on these machines results in erroneous, random values which
* could trigger unexpected thermal shutdown.
*/
static const struct soc_device_attribute soc_no_cpu_notifier[] = {
{ .machine = "OMAP4430" },
{ /* sentinel */ },
};
/*** Device driver call backs ***/
static
@ -1020,7 +1032,8 @@ 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);
if (!soc_device_match(soc_no_cpu_notifier))
cpu_pm_register_notifier(&bgp->nb);
#endif
return 0;
@ -1056,7 +1069,8 @@ int ti_bandgap_remove(struct platform_device *pdev)
struct ti_bandgap *bgp = platform_get_drvdata(pdev);
int i;
cpu_pm_unregister_notifier(&bgp->nb);
if (!soc_device_match(soc_no_cpu_notifier))
cpu_pm_unregister_notifier(&bgp->nb);
/* Remove sensor interfaces */
for (i = 0; i < bgp->conf->sensor_count; i++) {