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thermal: rockchip: tune tsadc parameter of temperature prediction

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init temp_last with a more suitable value. also we eliminate
the steady state error by ajusting the temp calc fomular.
extra useful log is added to mark tsadc is probed successfully.

Change-Id: If88031c10646437fa7b5152c70aeaebf93e4df05
Signed-off-by: Rocky Hao <rocky.hao@rock-chips.com>
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
This commit is contained in:
Rocky Hao
2018-05-28 17:47:28 +08:00
committed by Tao Huang
parent 73834d3fc6
commit d35fb3fe4d
1 changed files with 18 additions and 5 deletions
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23
drivers/thermal/rockchip_thermal.c
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@@ -232,13 +232,15 @@ struct rockchip_thermal_data {
#define GRF_CON_TSADC_CH_INV (0x10001 << 1)
#define MIN_TEMP (-40000)
#define LOWEST_TEMP (-273000)
#define MAX_TEMP (125000)
#define MAX_ENV_TEMP (85000)
#define BASE (1024)
#define BASE_SHIFT (10)
#define START_DEBOUNCE_COUNT (100)
#define HIGHER_DEBOUNCE_TEMP (30)
#define LOWER_DEBOUNCE_TEMP (15)
#define HIGHER_DEBOUNCE_TEMP (30000)
#define LOWER_DEBOUNCE_TEMP (15000)
/**
* struct tsadc_table - code to temperature conversion table
@@ -787,10 +789,19 @@ static int predict_temp(int temp)
int temp_now;
int prob_mid;
int prob_now;
static int temp_last = 25;
static int prob_last = 20;
static int temp_last = LOWEST_TEMP;
static int prob_last = 160;
static int bounding_cnt;
/*
* init temp_last with a more suitable value, which mostly equals to
* temp reading from tsadc, but not higher than MAX_ENV_TEMP. If the
* temp is higher than MAX_ENV_TEMP, it is assumed to be abnormal
* value and temp_last is adjusted to MAX_ENV_TEMP.
*/
if (temp_last == LOWEST_TEMP)
temp_last = min(temp, MAX_ENV_TEMP);
/*
* Before START_DEBOUNCE_COUNT's samples of temperature, we consider
* tsadc is stable, i.e. after that, the temperature may be not stable
@@ -816,7 +827,7 @@ static int predict_temp(int temp)
gain = (prob_mid * BASE) / (prob_mid + cov_r);
/* calculate the prediction of temperature */
temp_now = temp_mid + (gain * (temp - temp_mid) >> BASE_SHIFT);
temp_now = (temp_mid * BASE + gain * (temp - temp_mid)) >> BASE_SHIFT;
/*
* Base on this time's Kalman Gain, ajust our probability of prediction
@@ -1495,6 +1506,8 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
atomic_notifier_chain_register(&panic_notifier_list,
&rockchip_thermal_panic_block);
dev_info(&pdev->dev, "tsadc is probed successfully!\n");
return 0;
err_disable_pclk: