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

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Date:	Wed, 31 Oct 2012 15:22:02 +0900
From:	Jonghwan Choi <jhbird.choi@...sung.com>
To:	jonghwa3.lee@...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

Thanks.
Let me check.

> -----Original Message-----
> From: jonghwa3.lee@...sung.com [mailto:jonghwa3.lee@...sung.com]
> Sent: Wednesday, October 31, 2012 2:06 PM
> To: Jonghwan Choi
> Cc: 'open list'; 'Amit Daniel Kachhap'; 'Zhang Rui'; 'Sachin Kamat'
> 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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> >

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