diff options
| author | Ansuel Smith <ansuelsmth@gmail.com> | 2021-04-20 21:33:39 +0300 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2021-04-22 15:09:32 +0300 |
| commit | 3d08f029fdbbd29c8b363ef4c8c4bfe3b8f79ad0 (patch) | |
| tree | dc143f3d9d470559a25bc90f77a6a22d3ea57139 | |
| parent | fdda131f8fbadee2dfc21f0787d11547b42a961e (diff) | |
| download | linux-3d08f029fdbbd29c8b363ef4c8c4bfe3b8f79ad0.tar.xz | |
thermal/drivers/tsens: Fix bug in sensor enable for msm8960
Device based on tsens VER_0 contains a hardware bug that results in some
problem with sensor enablement. Sensor id 6-11 can't be enabled
selectively and all of them must be enabled in one step.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Acked-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210420183343.2272-6-ansuelsmth@gmail.com
| -rw-r--r-- | drivers/thermal/qcom/tsens-8960.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c index 83746ee3fc88..a96d37c2b674 100644 --- a/drivers/thermal/qcom/tsens-8960.c +++ b/drivers/thermal/qcom/tsens-8960.c @@ -27,9 +27,9 @@ #define EN BIT(0) #define SW_RST BIT(1) #define SENSOR0_EN BIT(3) +#define MEASURE_PERIOD BIT(18) #define SLP_CLK_ENA BIT(26) #define SLP_CLK_ENA_8660 BIT(24) -#define MEASURE_PERIOD 1 #define SENSOR0_SHIFT 3 /* INT_STATUS_ADDR bitmasks */ @@ -126,17 +126,34 @@ static int resume_8960(struct tsens_priv *priv) static int enable_8960(struct tsens_priv *priv, int id) { int ret; - u32 reg, mask; + u32 reg, mask = BIT(id); ret = regmap_read(priv->tm_map, CNTL_ADDR, ®); if (ret) return ret; - mask = BIT(id + SENSOR0_SHIFT); + /* HARDWARE BUG: + * On platforms with more than 6 sensors, all remaining sensors + * must be enabled together, otherwise undefined results are expected. + * (Sensor 6-7 disabled, Sensor 3 disabled...) In the original driver, + * all the sensors are enabled in one step hence this bug is not + * triggered. + */ + if (id > 5) + mask = GENMASK(10, 6); + + mask <<= SENSOR0_SHIFT; + + /* Sensors already enabled. Skip. */ + if ((reg & mask) == mask) + return 0; + ret = regmap_write(priv->tm_map, CNTL_ADDR, reg | SW_RST); if (ret) return ret; + reg |= MEASURE_PERIOD; + if (priv->num_sensors > 1) reg |= mask | SLP_CLK_ENA | EN; else |