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linux/drivers/thermal/ti-soc-thermal/omap4-thermal-data.c
Tony Lindgren 30d24faba0 thermal: ti-soc-thermal: Fix bogus thermal shutdowns for omap4430 
We can sometimes get bogus thermal shutdowns on omap4430 at least with
droid4 running idle with a battery charger connected:

thermal thermal_zone0: critical temperature reached (143 C), shutting down

Dumping out the register values shows we can occasionally get a 0x7f value
that is outside the TRM listed values in the ADC conversion table. And then
we get a normal value when reading again after that. Reading the register
multiple times does not seem help avoiding the bogus values as they stay
until the next sample is ready.

Looking at the TRM chapter "18.4.10.2.3 ADC Codes Versus Temperature", we
should have values from 13 to 107 listed with a total of 95 values. But
looking at the omap4430_adc_to_temp array, the values are off, and the
end values are missing. And it seems that the 4430 ADC table is similar
to omap3630 rather than omap4460.

Let's fix the issue by using values based on the omap3630 table and just
ignoring invalid values. Compared to the 4430 TRM, the omap3630 table has
the missing values added while the TRM table only shows every second
value.

Note that sometimes the ADC register values within the valid table can
also be way off for about 1 out of 10 values. But it seems that those
just show about 25 C too low values rather than too high values. So those
do not cause a bogus thermal shutdown.

Fixes: 1a31270e54 ("staging: omap-thermal: add OMAP4 data structures")
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200706183338.25622-1-tony@atomide.com
2020-09-04 11:52:46 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP4 thermal driver.
*
* Copyright (C) 2011-2012 Texas Instruments Inc.
* Contact:
* Eduardo Valentin <eduardo.valentin@ti.com>
*/
#include "ti-thermal.h"
#include "ti-bandgap.h"
#include "omap4xxx-bandgap.h"
/*
* OMAP4430 has one instance of thermal sensor for MPU
* need to describe the individual bit fields
*/
static struct temp_sensor_registers
omap4430_mpu_temp_sensor_registers = {
.temp_sensor_ctrl = OMAP4430_TEMP_SENSOR_CTRL_OFFSET,
.bgap_tempsoff_mask = OMAP4430_BGAP_TEMPSOFF_MASK,
.bgap_soc_mask = OMAP4430_BGAP_TEMP_SENSOR_SOC_MASK,
.bgap_eocz_mask = OMAP4430_BGAP_TEMP_SENSOR_EOCZ_MASK,
.bgap_dtemp_mask = OMAP4430_BGAP_TEMP_SENSOR_DTEMP_MASK,
.bgap_mode_ctrl = OMAP4430_TEMP_SENSOR_CTRL_OFFSET,
.mode_ctrl_mask = OMAP4430_SINGLE_MODE_MASK,
.bgap_efuse = OMAP4430_FUSE_OPP_BGAP,
};
/* Thresholds and limits for OMAP4430 MPU temperature sensor */
static struct temp_sensor_data omap4430_mpu_temp_sensor_data = {
.min_freq = OMAP4430_MIN_FREQ,
.max_freq = OMAP4430_MAX_FREQ,
};
/*
* Temperature values in milli degree celsius
* ADC code values from 13 to 107, see TRM
* "18.4.10.2.3 ADC Codes Versus Temperature".
*/
static const int
omap4430_adc_to_temp[OMAP4430_ADC_END_VALUE - OMAP4430_ADC_START_VALUE + 1] = {
-40000, -38000, -35000, -34000, -32000, -30000, -28000, -26000, -24000,
-22000, -20000, -18500, -17000, -15000, -13500, -12000, -10000, -8000,
-6500, -5000, -3500, -1500, 0, 2000, 3500, 5000, 6500, 8500, 10000,
12000, 13500, 15000, 17000, 19000, 21000, 23000, 25000, 27000, 28500,
30000, 32000, 33500, 35000, 37000, 38500, 40000, 42000, 43500, 45000,
47000, 48500, 50000, 52000, 53500, 55000, 57000, 58500, 60000, 62000,
64000, 66000, 68000, 70000, 71500, 73500, 75000, 77000, 78500, 80000,
82000, 83500, 85000, 87000, 88500, 90000, 92000, 93500, 95000, 97000,
98500, 100000, 102000, 103500, 105000, 107000, 109000, 111000, 113000,
115000, 117000, 118500, 120000, 122000, 123500, 125000,
};
/* OMAP4430 data */
const struct ti_bandgap_data omap4430_data = {
.features = TI_BANDGAP_FEATURE_MODE_CONFIG |
TI_BANDGAP_FEATURE_CLK_CTRL |
TI_BANDGAP_FEATURE_POWER_SWITCH,
.fclock_name = "bandgap_fclk",
.div_ck_name = "bandgap_fclk",
.conv_table = omap4430_adc_to_temp,
.adc_start_val = OMAP4430_ADC_START_VALUE,
.adc_end_val = OMAP4430_ADC_END_VALUE,
.expose_sensor = ti_thermal_expose_sensor,
.remove_sensor = ti_thermal_remove_sensor,
.sensors = {
{
.registers = &omap4430_mpu_temp_sensor_registers,
.ts_data = &omap4430_mpu_temp_sensor_data,
.domain = "cpu",
.slope_pcb = OMAP_GRADIENT_SLOPE_W_PCB_4430,
.constant_pcb = OMAP_GRADIENT_CONST_W_PCB_4430,
.register_cooling = ti_thermal_register_cpu_cooling,
.unregister_cooling = ti_thermal_unregister_cpu_cooling,
},
},
.sensor_count = 1,
};
/*
* OMAP4460 has one instance of thermal sensor for MPU
* need to describe the individual bit fields
*/
static struct temp_sensor_registers
omap4460_mpu_temp_sensor_registers = {
.temp_sensor_ctrl = OMAP4460_TEMP_SENSOR_CTRL_OFFSET,
.bgap_tempsoff_mask = OMAP4460_BGAP_TEMPSOFF_MASK,
.bgap_soc_mask = OMAP4460_BGAP_TEMP_SENSOR_SOC_MASK,
.bgap_eocz_mask = OMAP4460_BGAP_TEMP_SENSOR_EOCZ_MASK,
.bgap_dtemp_mask = OMAP4460_BGAP_TEMP_SENSOR_DTEMP_MASK,
.bgap_mask_ctrl = OMAP4460_BGAP_CTRL_OFFSET,
.mask_hot_mask = OMAP4460_MASK_HOT_MASK,
.mask_cold_mask = OMAP4460_MASK_COLD_MASK,
.bgap_mode_ctrl = OMAP4460_BGAP_CTRL_OFFSET,
.mode_ctrl_mask = OMAP4460_SINGLE_MODE_MASK,
.bgap_counter = OMAP4460_BGAP_COUNTER_OFFSET,
.counter_mask = OMAP4460_COUNTER_MASK,
.bgap_threshold = OMAP4460_BGAP_THRESHOLD_OFFSET,
.threshold_thot_mask = OMAP4460_T_HOT_MASK,
.threshold_tcold_mask = OMAP4460_T_COLD_MASK,
.tshut_threshold = OMAP4460_BGAP_TSHUT_OFFSET,
.tshut_hot_mask = OMAP4460_TSHUT_HOT_MASK,
.tshut_cold_mask = OMAP4460_TSHUT_COLD_MASK,
.bgap_status = OMAP4460_BGAP_STATUS_OFFSET,
.status_hot_mask = OMAP4460_HOT_FLAG_MASK,
.status_cold_mask = OMAP4460_COLD_FLAG_MASK,
.bgap_efuse = OMAP4460_FUSE_OPP_BGAP,
};
/* Thresholds and limits for OMAP4460 MPU temperature sensor */
static struct temp_sensor_data omap4460_mpu_temp_sensor_data = {
.tshut_hot = OMAP4460_TSHUT_HOT,
.tshut_cold = OMAP4460_TSHUT_COLD,
.t_hot = OMAP4460_T_HOT,
.t_cold = OMAP4460_T_COLD,
.min_freq = OMAP4460_MIN_FREQ,
.max_freq = OMAP4460_MAX_FREQ,
};
/*
* Temperature values in milli degree celsius
* ADC code values from 530 to 923
*/
static const int
omap4460_adc_to_temp[OMAP4460_ADC_END_VALUE - OMAP4460_ADC_START_VALUE + 1] = {
-40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200,
-37800, -37300, -36800, -36400, -36000, -35600, -35200, -34800,
-34300, -33800, -33400, -33000, -32600, -32200, -31800, -31300,
-30800, -30400, -30000, -29600, -29200, -28700, -28200, -27800,
-27400, -27000, -26600, -26200, -25700, -25200, -24800, -24400,
-24000, -23600, -23200, -22700, -22200, -21800, -21400, -21000,
-20600, -20200, -19700, -19200, -18800, -18400, -18000, -17600,
-17200, -16700, -16200, -15800, -15400, -15000, -14600, -14200,
-13700, -13200, -12800, -12400, -12000, -11600, -11200, -10700,
-10200, -9800, -9400, -9000, -8600, -8200, -7700, -7200, -6800,
-6400, -6000, -5600, -5200, -4800, -4300, -3800, -3400, -3000,
-2600, -2200, -1800, -1300, -800, -400, 0, 400, 800, 1200, 1600,
2100, 2600, 3000, 3400, 3800, 4200, 4600, 5100, 5600, 6000, 6400,
6800, 7200, 7600, 8000, 8500, 9000, 9400, 9800, 10200, 10600, 11000,
11400, 11900, 12400, 12800, 13200, 13600, 14000, 14400, 14800,
15300, 15800, 16200, 16600, 17000, 17400, 17800, 18200, 18700,
19200, 19600, 20000, 20400, 20800, 21200, 21600, 22100, 22600,
23000, 23400, 23800, 24200, 24600, 25000, 25400, 25900, 26400,
26800, 27200, 27600, 28000, 28400, 28800, 29300, 29800, 30200,
30600, 31000, 31400, 31800, 32200, 32600, 33100, 33600, 34000,
34400, 34800, 35200, 35600, 36000, 36400, 36800, 37300, 37800,
38200, 38600, 39000, 39400, 39800, 40200, 40600, 41100, 41600,
42000, 42400, 42800, 43200, 43600, 44000, 44400, 44800, 45300,
45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600, 49000,
49500, 50000, 50400, 50800, 51200, 51600, 52000, 52400, 52800,
53200, 53700, 54200, 54600, 55000, 55400, 55800, 56200, 56600,
57000, 57400, 57800, 58200, 58700, 59200, 59600, 60000, 60400,
60800, 61200, 61600, 62000, 62400, 62800, 63300, 63800, 64200,
64600, 65000, 65400, 65800, 66200, 66600, 67000, 67400, 67800,
68200, 68700, 69200, 69600, 70000, 70400, 70800, 71200, 71600,
72000, 72400, 72800, 73200, 73600, 74100, 74600, 75000, 75400,
75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, 79000,
79400, 79800, 80300, 80800, 81200, 81600, 82000, 82400, 82800,
83200, 83600, 84000, 84400, 84800, 85200, 85600, 86000, 86400,
86800, 87300, 87800, 88200, 88600, 89000, 89400, 89800, 90200,
90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400, 93800,
94200, 94600, 95000, 95500, 96000, 96400, 96800, 97200, 97600,
98000, 98400, 98800, 99200, 99600, 100000, 100400, 100800, 101200,
101600, 102000, 102400, 102800, 103200, 103600, 104000, 104400,
104800, 105200, 105600, 106100, 106600, 107000, 107400, 107800,
108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000,
111400, 111800, 112200, 112600, 113000, 113400, 113800, 114200,
114600, 115000, 115400, 115800, 116200, 116600, 117000, 117400,
117800, 118200, 118600, 119000, 119400, 119800, 120200, 120600,
121000, 121400, 121800, 122200, 122600, 123000, 123400, 123800, 124200,
124600, 124900, 125000, 125000, 125000, 125000
};
/* OMAP4460 data */
const struct ti_bandgap_data omap4460_data = {
.features = TI_BANDGAP_FEATURE_TSHUT |
TI_BANDGAP_FEATURE_TSHUT_CONFIG |
TI_BANDGAP_FEATURE_TALERT |
TI_BANDGAP_FEATURE_MODE_CONFIG |
TI_BANDGAP_FEATURE_POWER_SWITCH |
TI_BANDGAP_FEATURE_CLK_CTRL |
TI_BANDGAP_FEATURE_COUNTER,
.fclock_name = "bandgap_ts_fclk",
.div_ck_name = "div_ts_ck",
.conv_table = omap4460_adc_to_temp,
.adc_start_val = OMAP4460_ADC_START_VALUE,
.adc_end_val = OMAP4460_ADC_END_VALUE,
.expose_sensor = ti_thermal_expose_sensor,
.remove_sensor = ti_thermal_remove_sensor,
.report_temperature = ti_thermal_report_sensor_temperature,
.sensors = {
{
.registers = &omap4460_mpu_temp_sensor_registers,
.ts_data = &omap4460_mpu_temp_sensor_data,
.domain = "cpu",
.slope_pcb = OMAP_GRADIENT_SLOPE_W_PCB_4460,
.constant_pcb = OMAP_GRADIENT_CONST_W_PCB_4460,
.register_cooling = ti_thermal_register_cpu_cooling,
.unregister_cooling = ti_thermal_unregister_cpu_cooling,
},
},
.sensor_count = 1,
};
/* OMAP4470 data */
const struct ti_bandgap_data omap4470_data = {
.features = TI_BANDGAP_FEATURE_TSHUT |
TI_BANDGAP_FEATURE_TSHUT_CONFIG |
TI_BANDGAP_FEATURE_TALERT |
TI_BANDGAP_FEATURE_MODE_CONFIG |
TI_BANDGAP_FEATURE_POWER_SWITCH |
TI_BANDGAP_FEATURE_CLK_CTRL |
TI_BANDGAP_FEATURE_COUNTER,
.fclock_name = "bandgap_ts_fclk",
.div_ck_name = "div_ts_ck",
.conv_table = omap4460_adc_to_temp,
.adc_start_val = OMAP4460_ADC_START_VALUE,
.adc_end_val = OMAP4460_ADC_END_VALUE,
.expose_sensor = ti_thermal_expose_sensor,
.remove_sensor = ti_thermal_remove_sensor,
.report_temperature = ti_thermal_report_sensor_temperature,
.sensors = {
{
.registers = &omap4460_mpu_temp_sensor_registers,
.ts_data = &omap4460_mpu_temp_sensor_data,
.domain = "cpu",
.slope_pcb = OMAP_GRADIENT_SLOPE_W_PCB_4470,
.constant_pcb = OMAP_GRADIENT_CONST_W_PCB_4470,
.register_cooling = ti_thermal_register_cpu_cooling,
.unregister_cooling = ti_thermal_unregister_cpu_cooling,
},
},
.sensor_count = 1,
};
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