On 2016년 02월 18일 14:14, Krzysztof Kozlowski wrote:
> 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.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> ---
> drivers/thermal/samsung/exynos_tmu.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index fa61eff88496..6c6f59ba7423 100644
> --- 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");
>
Exynos5433 and Exynos7 have the 8 interrupt.
Reviewed-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Best Regards,
Chanwoo Choi
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