linux-kernel - Re: [PATCH V4 10/30] thermal: exynos: Support thermal tripping

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Message-ID: <CADGdYn4h_t4-n8erSTPwYyZP=efy8gF2QS6j9+BMnj1fY4uOPg@mail.gmail.com>
Date:	Tue, 4 Jun 2013 10:18:49 +0530
From:	amit daniel kachhap <amit.daniel@...sung.com>
To:	jonghwa3.lee@...sung.com
Cc:	linux-pm@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH V4 10/30] thermal: exynos: Support thermal tripping

Hi .

On Fri, May 17, 2013 at 5:26 PM,  <jonghwa3.lee@...sung.com> wrote:
> Hi, Amit
> On 2013년 05월 14일 18:58, Amit Daniel Kachhap wrote:
>
>> TMU urgently sends active-high signal (thermal trip) to PMU, and thermal
>> tripping by hardware logic. Thermal tripping means that PMU cuts off the
>> whole power of SoC by controlling external voltage regulator.
>>
>> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
>> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> ---
>>  drivers/thermal/samsung/exynos_tmu.c      |    8 +++++++-
>>  drivers/thermal/samsung/exynos_tmu_data.c |    2 ++
>>  2 files changed, 9 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
>> index 5f8f189..479d61e 100644
>> --- a/drivers/thermal/samsung/exynos_tmu.c
>> +++ b/drivers/thermal/samsung/exynos_tmu.c
>> @@ -84,6 +84,7 @@
>>  #define EXYNOS_TMU_CLEAR_FALL_INT    (0x111 << 12)
>>  #define EXYNOS_TMU_TRIP_MODE_SHIFT   13
>>  #define EXYNOS_TMU_TRIP_MODE_MASK    0x7
>> +#define EXYNOS_TMU_THERM_TRIP_EN_SHIFT       12
>>
>>  #define EXYNOS_TMU_INTEN_RISE0_SHIFT 0
>>  #define EXYNOS_TMU_INTEN_RISE1_SHIFT 4
>> @@ -186,7 +187,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>>  {
>>       struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>>       struct exynos_tmu_platform_data *pdata = data->pdata;
>> -     unsigned int status, trim_info;
>> +     unsigned int status, trim_info, con;
>>       unsigned int rising_threshold = 0, falling_threshold = 0;
>>       int ret = 0, threshold_code, i, trigger_levs = 0;
>>
>> @@ -251,6 +252,11 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>>                                       falling_threshold |=
>>                                               threshold_code << 8 * i;
>>                       }
>> +                     if (pdata->trigger_type[i] != HW_TRIP)
>> +                             continue;
>
>
> As you know, HW trip can be used when only the most last level of threshold
> temperature is set. (exynos4412 : 4th, exynos 5440 : 5th threshold level). So it
> wouldn't work properly, even if we enable HW trip according to pre-defined
> trigger type not to HW trip threshold temperature. To enable HW trip, we just
> need to check whether if HW trip threshold temperature level is defined.
>
> if (trigger_level[HW_TRIP_LEVEL])
>         enable HW trip
Yes you are right. I will include this change in the next version.

Thanks,
Amit Daniel
>
> Thanks,
> Jonghwa
>
>> +                     con = readl(data->base + EXYNOS_TMU_REG_CONTROL);
>> +                     con |= (1 << EXYNOS_TMU_THERM_TRIP_EN_SHIFT);
>> +                     writel(con, data->base + EXYNOS_TMU_REG_CONTROL);
>>               }
>>
>>               writel(rising_threshold,
>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
>> index ee6a3c9..6b937f5 100644
>> --- a/drivers/thermal/samsung/exynos_tmu_data.c
>> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
>> @@ -64,6 +64,7 @@ struct exynos_tmu_platform_data const exynos5250_default_tmu_data = {
>>       .trigger_levels[0] = 85,
>>       .trigger_levels[1] = 103,
>>       .trigger_levels[2] = 110,
>> +     .trigger_levels[3] = 120,
>>       .trigger_enable[0] = 1,
>>       .trigger_enable[1] = 1,
>>       .trigger_enable[2] = 1,
>> @@ -71,6 +72,7 @@ struct exynos_tmu_platform_data const exynos5250_default_tmu_data = {
>>       .trigger_type[0] = 0,
>>       .trigger_type[1] = 0,
>>       .trigger_type[2] = 1,
>> +     .trigger_type[3] = 2,
>>       .gain = 8,
>>       .reference_voltage = 16,
>>       .noise_cancel_mode = 4,
>
>
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