thermal: stm32: read factory settings inside stm_thermal_prepare

Calling stm_thermal_read_factory_settings before clocking
internal peripheral causes bad register values and makes
temperature computation wrong.

Calling stm_thermal_read_factory_settings inside
stm_thermal_prepare fixes this problem as internal
peripheral is well clocked at this stage.

Fixes: 1d693155 ("thermal: add stm32 thermal driver")
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: David Hernandez Sanchez <david.hernandezsanchez@st.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/thermal/st/stm_thermal.c b/drivers/thermal/st/stm_thermal.c
index 47623da0f91b..daa1257809a6 100644
--- a/drivers/thermal/st/stm_thermal.c
+++ b/drivers/thermal/st/stm_thermal.c
@@ -532,6 +532,10 @@ static int stm_thermal_prepare(struct stm_thermal_sensor *sensor)
         if (ret)
                 return ret;
 
+        ret = stm_thermal_read_factory_settings(sensor);
+        if (ret)
+                goto thermal_unprepare;
+
         ret = stm_thermal_calibration(sensor);
         if (ret)
                 goto thermal_unprepare;
@@ -636,10 +640,6 @@ static int stm_thermal_probe(struct platform_device *pdev)
         /* Populate sensor */
         sensor->base = base;
 
-        ret = stm_thermal_read_factory_settings(sensor);
-        if (ret)
-                return ret;
-
         sensor->clk = devm_clk_get(&pdev->dev, "pclk");
         if (IS_ERR(sensor->clk)) {
                 dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n",