linux-kernel - Re: [PATCH 2/2] therma: exynos: Supports thermal tripping

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Date:	Wed, 31 Oct 2012 14:06:17 +0900
From:	jonghwa3.lee@...sung.com
To:	Jonghwan Choi <jhbird.choi@...sung.com>
Cc:	'open list' <linux-kernel@...r.kernel.org>,
	'Amit Daniel Kachhap' <amit.kachhap@...aro.org>,
	'Zhang Rui' <rui.zhang@...el.com>,
	'Sachin Kamat' <sachin.kamat@...aro.org>
Subject: Re: [PATCH 2/2] therma: exynos: Supports thermal tripping

On 2012년 10월 30일 14:32, Jonghwan Choi wrote:
> TMU urgently sends active-high signal (thermal trip) to PMU,
> and thermal tripping by hardware logic i.e PMU is performed.
> Thermal tripping means that PMU cut off the whole power of SoC
> by controlling external voltage regulator.
>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
>  drivers/thermal/exynos_thermal.c             |    7 ++++++-
>  include/linux/platform_data/exynos_thermal.h |    4 ++++
>  2 files changed, 10 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/thermal/exynos_thermal.c
> b/drivers/thermal/exynos_thermal.c
> index 6ce6667..edac601 100644
> --- a/drivers/thermal/exynos_thermal.c
> +++ b/drivers/thermal/exynos_thermal.c
> @@ -53,6 +53,7 @@
>  #define EXYNOS_TMU_TRIM_TEMP_MASK      0xff
>  #define EXYNOS_TMU_GAIN_SHIFT          8
>  #define EXYNOS_TMU_REF_VOLTAGE_SHIFT   24
> +#define EXYNOS_TMU_TRIP_EN             BIT(12)
>  #define EXYNOS_TMU_CORE_ON             1
>  #define EXYNOS_TMU_CORE_OFF            0
>  #define EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET     50
> @@ -656,6 +657,8 @@ static void exynos_tmu_control(struct platform_device
> *pdev, bool on)
>         if (data->soc == SOC_ARCH_EXYNOS) {
>                 con |= pdata->noise_cancel_mode <<
> EXYNOS_TMU_TRIP_MODE_SHIFT;
>                 con |= (EXYNOS_MUX_ADDR_VALUE << EXYNOS_MUX_ADDR_SHIFT);
> +               if (pdata->trip_en)
> +                       con |= EXYNOS_THERMAL_TRIP_EN;
>         }
>
>         if (on) {
> @@ -762,10 +765,12 @@ static struct exynos_tmu_platform_data const
> exynos_default_tmu_data = {
>         .trigger_levels[0] = 85,
>         .trigger_levels[1] = 103,
>         .trigger_levels[2] = 110,
> +       .trigger_levels[3] = 120,
>         .trigger_level0_en = 1,
>         .trigger_level1_en = 1,
>         .trigger_level2_en = 1,
> -       .trigger_level3_en = 0,
> +       .trigger_level3_en = 1,
> +       .trip_en = 1,
>         .gain = 8,
>         .reference_voltage = 16,
>         .noise_cancel_mode = 4,
> diff --git a/include/linux/platform_data/exynos_thermal.h
> b/include/linux/platform_data/exynos_thermal.h
> index a7bdb2f..9e44aac 100644
> --- a/include/linux/platform_data/exynos_thermal.h
> +++ b/include/linux/platform_data/exynos_thermal.h
> @@ -79,6 +79,9 @@ struct freq_clip_table {
>   * @trigger_level3_en:
>   *     1 = enable trigger_level3 interrupt,
>   *     0 = disable trigger_level3 interrupt
> + * @trip_en:
> + *     1 = enable thermal tripping
> + *     0 = disable thermal tripping
>   * @gain: gain of amplifier in the positive-TC generator block
>   *     0 <= gain <= 15
>   * @reference_voltage: reference voltage of amplifier
> @@ -102,6 +105,7 @@ struct exynos_tmu_platform_data {
>         bool trigger_level1_en;
>         bool trigger_level2_en;
>         bool trigger_level3_en;
> +       bool trip_en;
I think this variable addition is not necessary. It's enough to use
trigger_level3_en variable
to determine hardware thermal tripping enable or not. Since exynos4210
has different register map from
other exynos SOC's, trigger level 3 enable is existed different region.
exynos4210 has it in
interrupt enable register and others has it in TMU core control register
(exynos4x12 and exynos5
doesn't have trigger_level3_en bit in interrupt enable register).
Thus it's better to use trigger_level3_en variable to enable hardware
thermal tripping support for compatibility.

Thanks,
Jonghwa Lee.
>
>         u8 gain;
>         u8 reference_voltage;
> --
> 1.7.4.1
>
> --
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