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thermal/drivers/mediatek/lvts_thermal: Manage threshold between sensors

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Each LVTS thermal controller can have up to four sensors, each capable
of triggering its own interrupt when its measured temperature crosses
the configured threshold. The threshold for each sensor is handled
separately by the thermal framework, since each one is registered with
its own thermal zone and trips. However, the temperature thresholds are
configured on the controller, and therefore are shared between all
sensors on that controller.

When the temperature measured by the sensors is different enough to
cause the thermal framework to configure different thresholds for each
one, interrupts start triggering on sensors outside the last threshold
configured.

To address the issue, track the thresholds required by each sensor and
only actually set the highest one in the hardware, and disable
interrupts for all sensors outside the current configured range.

Fixes: f5f633b182 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230706153823.201943-7-nfraprado@collabora.com
This commit is contained in:
Nícolas F. R. A. Prado 2023-07-06 11:37:37 -04:00 committed by Daniel Lezcano
parent 77354eaef8
commit 2bba1acf7a
1 changed files with 69 additions and 0 deletions
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69
drivers/thermal/mediatek/lvts_thermal.c
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@ -67,6 +67,11 @@
#define LVTS_CALSCALE_CONF 0x300
#define LVTS_MONINT_CONF 0x8300318C
#define LVTS_MONINT_OFFSET_SENSOR0 0xC
#define LVTS_MONINT_OFFSET_SENSOR1 0x180
#define LVTS_MONINT_OFFSET_SENSOR2 0x3000
#define LVTS_MONINT_OFFSET_SENSOR3 0x3000000
#define LVTS_INT_SENSOR0 0x0009001F
#define LVTS_INT_SENSOR1 0x001203E0
#define LVTS_INT_SENSOR2 0x00247C00
@ -112,6 +117,8 @@ struct lvts_sensor {
void __iomem *base;
int id;
int dt_id;
int low_thresh;
int high_thresh;
};
struct lvts_ctrl {
@ -121,6 +128,8 @@ struct lvts_ctrl {
int num_lvts_sensor;
int mode;
void __iomem *base;
int low_thresh;
int high_thresh;
};
struct lvts_domain {
@ -292,12 +301,66 @@ static int lvts_get_temp(struct thermal_zone_device *tz, int *temp)
return 0;
}
static void lvts_update_irq_mask(struct lvts_ctrl *lvts_ctrl)
{
u32 masks[] = {
LVTS_MONINT_OFFSET_SENSOR0,
LVTS_MONINT_OFFSET_SENSOR1,
LVTS_MONINT_OFFSET_SENSOR2,
LVTS_MONINT_OFFSET_SENSOR3,
};
u32 value = 0;
int i;
value = readl(LVTS_MONINT(lvts_ctrl->base));
for (i = 0; i < ARRAY_SIZE(masks); i++) {
if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
&& lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
value |= masks[i];
else
value &= ~masks[i];
}
writel(value, LVTS_MONINT(lvts_ctrl->base));
}
static bool lvts_should_update_thresh(struct lvts_ctrl *lvts_ctrl, int high)
{
int i;
if (high > lvts_ctrl->high_thresh)
return true;
for (i = 0; i < lvts_ctrl->num_lvts_sensor; i++)
if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
&& lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
return false;
return true;
}
static int lvts_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct lvts_sensor *lvts_sensor = thermal_zone_device_priv(tz);
struct lvts_ctrl *lvts_ctrl = container_of(lvts_sensor, struct lvts_ctrl, sensors[lvts_sensor->id]);
void __iomem *base = lvts_sensor->base;
u32 raw_low = lvts_temp_to_raw(low != -INT_MAX ? low : LVTS_MINIMUM_THRESHOLD);
u32 raw_high = lvts_temp_to_raw(high);
bool should_update_thresh;
lvts_sensor->low_thresh = low;
lvts_sensor->high_thresh = high;
should_update_thresh = lvts_should_update_thresh(lvts_ctrl, high);
if (should_update_thresh) {
lvts_ctrl->high_thresh = high;
lvts_ctrl->low_thresh = low;
}
lvts_update_irq_mask(lvts_ctrl);
if (!should_update_thresh)
return 0;
/*
* Low offset temperature threshold
@ -521,6 +584,9 @@ static int lvts_sensor_init(struct device *dev, struct lvts_ctrl *lvts_ctrl,
*/
lvts_sensor[i].msr = lvts_ctrl_data->mode == LVTS_MSR_IMMEDIATE_MODE ?
imm_regs[i] : msr_regs[i];
lvts_sensor[i].low_thresh = INT_MIN;
lvts_sensor[i].high_thresh = INT_MIN;
};
lvts_ctrl->num_lvts_sensor = lvts_ctrl_data->num_lvts_sensor;
@ -688,6 +754,9 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
*/
lvts_ctrl[i].hw_tshut_raw_temp =
lvts_temp_to_raw(lvts_data->lvts_ctrl[i].hw_tshut_temp);
lvts_ctrl[i].low_thresh = INT_MIN;
lvts_ctrl[i].high_thresh = INT_MIN;
}
/*