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Subject[PATCH v2 5/5] thermal: tsens: Check if we have valid data before reading
Date
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
---
drivers/thermal/qcom/tsens-common.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
index 961ace4..f510e61 100644
--- a/drivers/thermal/qcom/tsens-common.c
+++ b/drivers/thermal/qcom/tsens-common.c
@@ -114,6 +114,9 @@ int get_temp_common(struct tsens_device *tmdev, int id, int *temp)
#define STATUS_VALID_BIT BIT(21)
#define CODE_SIGN_BIT BIT(11)

+#define TRDY_OFFSET 0xe4
+#define TRDY_READY_BIT BIT(0)
+
int get_temp_tsens_v2(struct tsens_device *tmdev, int id, int *temp)
{
struct tsens_sensor *s = &tmdev->sensor[id];
@@ -121,6 +124,12 @@ int get_temp_tsens_v2(struct tsens_device *tmdev, int id, int *temp)
unsigned int sensor_addr;
int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret;

+ ret = regmap_read(tmdev->map, TRDY_OFFSET, &code);
+ if (ret)
+ return ret;
+ if (code & TRDY_READY_BIT)
+ return -ENODATA;
+
sensor_addr = STATUS_OFFSET + s->hw_id * 4;
ret = regmap_read(tmdev->map, sensor_addr, &code);
if (ret)
--
2.7.4
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