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thermal: exynos: Reduce severity of too early temperature read

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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 0eb875d88a ("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>
This commit is contained in:
Krzysztof Kozlowski 2018-05-13 19:54:02 +02:00 committed by Eduardo Valentin
parent 45f8b0dde3
commit ffe6e16f14
1 changed files with 7 additions and 1 deletions
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8
drivers/thermal/samsung/exynos_tmu.c
View file

@ -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);