thermal: exynos: Print a message about exceeded number of supported trip-points

When DeviveTree contains more trip-points than SoC can configure
(usually more than four) and polling mode is not enabled, then the
remaining trip-points will be silently ignored. No interrupts will be
generated for them.

This might be quite dangerous when one provides DTB with a
non-configurable critical trip-point, like (assuming four supported
thresholds in TMU):
 - alert @50 C (type: active),
 - alert @60 C (type: active),
 - alert @70 C (type: active),
 - alert @80 C (type: active),
 - critical @120 C (type: critical) <- no interrupts generated.

This is a mistake in DTB so print a message in such case.

Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index fa61eff88496e541334043f5457f1f989dd7e480..6c6f59ba742328922c3184318dc62ae3faa6c851 100644 (file)
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -184,6 +184,7 @@
  * @temp_error2: fused value of the second point trim.
  * @regulator: pointer to the TMU regulator structure.
  * @reg_conf: pointer to structure to register with core thermal.
+ * @ntrip: number of supported trip points.
  * @tmu_initialize: SoC specific TMU initialization method
  * @tmu_control: SoC specific TMU control method
  * @tmu_read: SoC specific TMU temperature read method
@@ -203,6 +204,7 @@ struct exynos_tmu_data {
        u16 temp_error1, temp_error2;
        struct regulator *regulator;
        struct thermal_zone_device *tzd;
+       unsigned int ntrip;
 
        int (*tmu_initialize)(struct platform_device *pdev);
        void (*tmu_control)(struct platform_device *pdev, bool on);
@@ -346,6 +348,14 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
        struct exynos_tmu_data *data = platform_get_drvdata(pdev);
        int ret;
 
+       if (of_thermal_get_ntrips(data->tzd) > data->ntrip) {
+               dev_info(&pdev->dev,
+                        "More trip points than supported by this TMU.\n");
+               dev_info(&pdev->dev,
+                        "%d trip points should be configured in polling mode.\n",
+                        (of_thermal_get_ntrips(data->tzd) - data->ntrip));
+       }
+
        mutex_lock(&data->lock);
        clk_enable(data->clk);
        if (!IS_ERR(data->clk_sec))
@@ -1210,6 +1220,7 @@ static int exynos_map_dt_data(struct platform_device *pdev)
                data->tmu_control = exynos4210_tmu_control;
                data->tmu_read = exynos4210_tmu_read;
                data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
+               data->ntrip = 4;
                break;
        case SOC_ARCH_EXYNOS3250:
        case SOC_ARCH_EXYNOS4412:
@@ -1222,6 +1233,7 @@ static int exynos_map_dt_data(struct platform_device *pdev)
                data->tmu_read = exynos4412_tmu_read;
                data->tmu_set_emulation = exynos4412_tmu_set_emulation;
                data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
+               data->ntrip = 4;
                break;
        case SOC_ARCH_EXYNOS5433:
                data->tmu_initialize = exynos5433_tmu_initialize;
@@ -1229,6 +1241,7 @@ static int exynos_map_dt_data(struct platform_device *pdev)
                data->tmu_read = exynos4412_tmu_read;
                data->tmu_set_emulation = exynos4412_tmu_set_emulation;
                data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
+               data->ntrip = 8;
                break;
        case SOC_ARCH_EXYNOS5440:
                data->tmu_initialize = exynos5440_tmu_initialize;
@@ -1236,6 +1249,7 @@ static int exynos_map_dt_data(struct platform_device *pdev)
                data->tmu_read = exynos5440_tmu_read;
                data->tmu_set_emulation = exynos5440_tmu_set_emulation;
                data->tmu_clear_irqs = exynos5440_tmu_clear_irqs;
+               data->ntrip = 4;
                break;
        case SOC_ARCH_EXYNOS7:
                data->tmu_initialize = exynos7_tmu_initialize;
@@ -1243,6 +1257,7 @@ static int exynos_map_dt_data(struct platform_device *pdev)
                data->tmu_read = exynos7_tmu_read;
                data->tmu_set_emulation = exynos4412_tmu_set_emulation;
                data->tmu_clear_irqs = exynos4210_tmu_clear_irqs;
+               data->ntrip = 8;
                break;
        default:
                dev_err(&pdev->dev, "Platform not supported\n");