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authorKrzysztof Kozlowski <krzk@kernel.org>2018-05-13 19:54:02 +0200
committerEduardo Valentin <edubezval@gmail.com>2018-06-01 23:32:01 +0200
commitffe6e16f14faf5af6bae7293ebddb481a1d77ae6 (patch)
tree90bf3d3a25b281f70b1089cce8aea4212ce1c9f1 /drivers/thermal
parentthermal: imx: Switch to SPDX identifier (diff)
downloadlinux-ffe6e16f14faf5af6bae7293ebddb481a1d77ae6.tar.xz
linux-ffe6e16f14faf5af6bae7293ebddb481a1d77ae6.zip
thermal: exynos: Reduce severity of too early temperature read
Thermal core tries to read temperature during sensor registering in thermal_zone_of_sensor_register(). In that time Exynos TMU driver and hardware are not yet initialized. Commit 0eb875d88aaa ("thermal: exynos: Reading temperature makes sense only when TMU is turned on") added a boolean flag to prevent reading bogus temperature in such case but it exposed warning message during boot: [ 3.864913] thermal thermal_zone0: failed to read out thermal zone (-22) Return EAGAIN in such case to skip omitting such message because it might mislead user. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/samsung/exynos_tmu.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 3b20309789e3..c24969d740d1 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -666,8 +666,14 @@ static int exynos_get_temp(void *p, int *temp)
struct exynos_tmu_data *data = p;
int value, ret = 0;
- if (!data || !data->tmu_read || !data->enabled)
+ if (!data || !data->tmu_read)
return -EINVAL;
+ else if (!data->enabled)
+ /*
+ * Called too early, probably
+ * from thermal_zone_of_sensor_register().
+ */
+ return -EAGAIN;
mutex_lock(&data->lock);
clk_enable(data->clk);