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authorRocky Hao <rocky.hao@rock-chips.com>2016-07-27 22:10:42 +0800
committerZhang Rui <rui.zhang@intel.com>2016-09-27 14:02:16 +0800
commit23f75e4893b488c41a940f730ae7760376e02426 (patch)
tree119cdda30ca4c12dfe7688ee1c2def3b9de8b69f /drivers/thermal
parent5b97469a55872a30a0d53a1279a8ae8b1c68b52c (diff)
downloadlinux-23f75e4893b488c41a940f730ae7760376e02426.tar.bz2
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 <rocky.hao@rock-chips.com> Signed-off-by: Caesar Wang <wxt@rock-chips.com> Cc: Eduardo Valentin <edubezval@gmail.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Heiko Stuebner <heiko@sntech.de> Cc: linux-pm@vger.kernel.org Tested-by: Stephen Barber <smbarber@chromium.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/rockchip_thermal.c11
1 files changed, 6 insertions, 5 deletions
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);