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authorMarek Szyprowski <m.szyprowski@samsung.com>2018-04-16 12:11:52 +0200
committerEduardo Valentin <edubezval@gmail.com>2018-05-06 13:45:12 -0700
commit0eb875d88aaa98ceb7134cb54638e49b35ab0946 (patch)
tree7dfedae069fe7eecad4bc630fd8388000b1988c3 /drivers/thermal/samsung
parentf085f672b7d4033ea40db8c4b6929324833ce7b2 (diff)
thermal: exynos: Reading temperature makes sense only when TMU is turned on
When thermal sensor is not yet enabled, reading temperature might return random value. This might even result in stopping system booting when such temperature is higher than the critical value. Fix this by checking if TMU has been actually enabled before reading the temperature. This change fixes booting of Exynos4210-based board with TMU enabled (for example Samsung Trats board), which was broken since v4.4 kernel release. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Fixes: 9e4249b40340 ("thermal: exynos: Fix first temperature read after registering sensor") CC: stable@vger.kernel.org # v4.6+ Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal/samsung')
-rw-r--r--drivers/thermal/samsung/exynos_tmu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index ed805c7c5ace..986cbd01aaaa 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -185,6 +185,7 @@
* @regulator: pointer to the TMU regulator structure.
* @reg_conf: pointer to structure to register with core thermal.
* @ntrip: number of supported trip points.
+ * @enabled: current status of TMU device
* @tmu_initialize: SoC specific TMU initialization method
* @tmu_control: SoC specific TMU control method
* @tmu_read: SoC specific TMU temperature read method
@@ -205,6 +206,7 @@ struct exynos_tmu_data {
struct regulator *regulator;
struct thermal_zone_device *tzd;
unsigned int ntrip;
+ bool enabled;
int (*tmu_initialize)(struct platform_device *pdev);
void (*tmu_control)(struct platform_device *pdev, bool on);
@@ -398,6 +400,7 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
mutex_lock(&data->lock);
clk_enable(data->clk);
data->tmu_control(pdev, on);
+ data->enabled = on;
clk_disable(data->clk);
mutex_unlock(&data->lock);
}
@@ -890,7 +893,7 @@ static int exynos_get_temp(void *p, int *temp)
{
struct exynos_tmu_data *data = p;
- if (!data || !data->tmu_read)
+ if (!data || !data->tmu_read || !data->enabled)
return -EINVAL;
mutex_lock(&data->lock);