4.9-stable review patch. If anyone has any objections, please let me know.
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From: Marek Szyprowski m.szyprowski@samsung.com
commit 88fc6f73fddf64eb507b04f7b2bd01d7291db514 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/thermal/samsung/exynos_tmu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- 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 pl 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 { struct exynos_tmu_data *data = p;
- if (!data || !data->tmu_read) + if (!data || !data->tmu_read || !data->enabled) return -EINVAL;
mutex_lock(&data->lock);