linux-kernel - [PATCH v2 5/5] thermal: tsens: Check if we have valid data before reading

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Date:   Tue, 12 Jun 2018 13:54:57 +0300
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     linux-kernel@...r.kernel.org
Cc:     rnayak@...eaurora.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org, edubezval@...il.com,
        Zhang Rui <rui.zhang@...el.com>,
        linux-pm@...r.kernel.org (open list:THERMAL)
Subject: [PATCH v2 5/5] thermal: tsens: Check if we have valid data before reading

Signed-off-by: Amit Kucheria <amit.kucheria@...aro.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