diff options
| author | Rocky Hao <rocky.hao@rock-chips.com> | 2016-07-18 17:52:43 +0800 |
|---|---|---|
| committer | Gerrit Code Review <gerrit@rock-chips.com> | 2016-07-19 17:25:42 +0800 |
| commit | 7f0ee6456f74b9c1870feb63b57c315ec9bd4ba9 (patch) | |
| tree | 278786b1ec8a4f7704630ff6ca47a0d74bc22344 /drivers/thermal | |
| parent | 01240c217a78dac4d12eda161d9b756fc8ac5912 (diff) | |
thermal: rockchip: rk3399: enhance the tsadc's bandgap feature
Due to the voltage ripple, the sensing data of the tsadc is not accurate.
And in this patch, the bandgap feature is enhanced to remove the voltage
ripple, and then the tsadc can sense the temperature more precisely.
Obsolete codes are removed as well.
Change-Id: Ifdd98def63212bc13306e7d5befee5eb32dbbc2f
Signed-off-by: Rocky Hao <rocky.hao@rock-chips.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/rockchip_thermal.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c index f46ab8721bc2..43f3371360b2 100644 --- a/drivers/thermal/rockchip_thermal.c +++ b/drivers/thermal/rockchip_thermal.c @@ -222,10 +222,10 @@ struct rockchip_thermal_data { #define GRF_TSADC_TESTBIT_L 0x0e648 #define GRF_TSADC_TESTBIT_H 0x0e64c -#define GRF_TSADC_TSEN_PD_ON (0x30003 << 0) -#define GRF_TSADC_TSEN_PD_OFF (0x30000 << 0) #define GRF_SARADC_TESTBIT_ON (0x10001 << 2) #define GRF_TSADC_TESTBIT_H_ON (0x10001 << 2) +#define GRF_TSADC_VCM_EN_L (0x10001 << 7) +#define GRF_TSADC_VCM_EN_H (0x10001 << 7) /** * struct tsadc_table - code to temperature conversion table @@ -567,9 +567,10 @@ static void rk_tsadcv3_initialize(struct regmap *grf, void __iomem *regs, regs + TSADCV2_HIGHT_TSHUT_DEBOUNCE); } else { - regmap_write(grf, GRF_TSADC_TESTBIT_L, GRF_TSADC_TSEN_PD_ON); - mdelay(10); - regmap_write(grf, GRF_TSADC_TESTBIT_L, GRF_TSADC_TSEN_PD_OFF); + /* Enable the voltage common mode feature */ + regmap_write(grf, GRF_TSADC_TESTBIT_L, GRF_TSADC_VCM_EN_L); + regmap_write(grf, GRF_TSADC_TESTBIT_H, GRF_TSADC_VCM_EN_H); + udelay(100); /* The spec note says at least 15 us */ regmap_write(grf, GRF_SARADC_TESTBIT, GRF_SARADC_TESTBIT_ON); regmap_write(grf, GRF_TSADC_TESTBIT_H, GRF_TSADC_TESTBIT_H_ON); |