From 23f75e4893b488c41a940f730ae7760376e02426 Mon Sep 17 00:00:00 2001 From: Rocky Hao Date: Wed, 27 Jul 2016 22:10:42 +0800 Subject: thermal: rockchip: enhance the tsadc's bandgap feature for rk3399 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. Signed-off-by: Rocky Hao Signed-off-by: Caesar Wang Cc: Eduardo Valentin Cc: Zhang Rui Cc: Heiko Stuebner Cc: linux-pm@vger.kernel.org Tested-by: Stephen Barber Signed-off-by: Zhang Rui --- drivers/thermal/rockchip_thermal.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'drivers/thermal/rockchip_thermal.c') diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c index db5ecc5ed83a..a90423d16f39 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); + usleep_range(15, 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); -- cgit v1.2.3-59-g8ed1b