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authorYuanjiang Yu <yuanjiang.yu@unisoc.com>2019-01-15 18:32:37 +0800
committerSebastian Reichel <sre@kernel.org>2019-01-23 21:26:56 +0100
commitd3e67c94e8f607ee90097d296deecf030af9b8ab (patch)
treee6ce8f1f35f0c948f9c8cd0d4683a4b47a86a8fe /drivers/power
parent3a28f203c57944ac98a3adcbfacdbfa385966972 (diff)
downloadlinux-stericsson-d3e67c94e8f607ee90097d296deecf030af9b8ab.tar.gz
power: supply: sc27xx: Fix capacity saving function
We found sometimes we can not get the saving capacity to initialize the battery capacity, the reason is the user area registers are put on power always-on region, so we need delay some time to wait until values are updated successfully. Moreover we also should clear the USER_AREA_CLEAR register after setting the USER_AREA_SET register, otherwise we can not save the values in the USER_AREA_SET register. Signed-off-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/sc27xx_fuel_gauge.c64
1 files changed, 59 insertions, 5 deletions
diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c
index ea1349fe55a5..24895cc3b41e 100644
--- a/drivers/power/supply/sc27xx_fuel_gauge.c
+++ b/drivers/power/supply/sc27xx_fuel_gauge.c
@@ -171,10 +171,37 @@ static int sc27xx_fgu_save_boot_mode(struct sc27xx_fgu_data *data,
if (ret)
return ret;
+ /*
+ * Since the user area registers are put on power always-on region,
+ * then these registers changing time will be a little long. Thus
+ * here we should delay 200us to wait until values are updated
+ * successfully according to the datasheet.
+ */
+ udelay(200);
+
+ ret = regmap_update_bits(data->regmap,
+ data->base + SC27XX_FGU_USER_AREA_SET,
+ SC27XX_FGU_MODE_AREA_MASK,
+ boot_mode << SC27XX_FGU_MODE_AREA_SHIFT);
+ if (ret)
+ return ret;
+
+ /*
+ * Since the user area registers are put on power always-on region,
+ * then these registers changing time will be a little long. Thus
+ * here we should delay 200us to wait until values are updated
+ * successfully according to the datasheet.
+ */
+ udelay(200);
+
+ /*
+ * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
+ * make the user area data available, otherwise we can not save the user
+ * area data.
+ */
return regmap_update_bits(data->regmap,
- data->base + SC27XX_FGU_USER_AREA_SET,
- SC27XX_FGU_MODE_AREA_MASK,
- boot_mode << SC27XX_FGU_MODE_AREA_SHIFT);
+ data->base + SC27XX_FGU_USER_AREA_CLEAR,
+ SC27XX_FGU_MODE_AREA_MASK, 0);
}
static int sc27xx_fgu_save_last_cap(struct sc27xx_fgu_data *data, int cap)
@@ -188,9 +215,36 @@ static int sc27xx_fgu_save_last_cap(struct sc27xx_fgu_data *data, int cap)
if (ret)
return ret;
+ /*
+ * Since the user area registers are put on power always-on region,
+ * then these registers changing time will be a little long. Thus
+ * here we should delay 200us to wait until values are updated
+ * successfully according to the datasheet.
+ */
+ udelay(200);
+
+ ret = regmap_update_bits(data->regmap,
+ data->base + SC27XX_FGU_USER_AREA_SET,
+ SC27XX_FGU_CAP_AREA_MASK, cap);
+ if (ret)
+ return ret;
+
+ /*
+ * Since the user area registers are put on power always-on region,
+ * then these registers changing time will be a little long. Thus
+ * here we should delay 200us to wait until values are updated
+ * successfully according to the datasheet.
+ */
+ udelay(200);
+
+ /*
+ * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
+ * make the user area data available, otherwise we can not save the user
+ * area data.
+ */
return regmap_update_bits(data->regmap,
- data->base + SC27XX_FGU_USER_AREA_SET,
- SC27XX_FGU_CAP_AREA_MASK, cap);
+ data->base + SC27XX_FGU_USER_AREA_CLEAR,
+ SC27XX_FGU_CAP_AREA_MASK, 0);
}
static int sc27xx_fgu_read_last_cap(struct sc27xx_fgu_data *data, int *cap)