Re: [PATCH v12 7/7] thermal:exynos:boost: Automatic enable/disable of BOOST feature (at Exynos4412)

Zhang Rui
2014-01-10T06:35:12Z

On Fri, 2013-12-20 at 15:24 +0100, Lukasz Majewski wrote:
> This patch provides auto disable/enable operation for boost. It uses already
> present thermal infrastructure to provide BOOST hysteresis.
> The TMU data has been modified to work properly with or without BOOST.
> Hence, the two first trip points with corresponding clip frequencies were
> adjusted.
>
> The first one was reduced from 85 to 70 degrees and clip frequency was
> increased to 1.4 GHz from 800 MHz. This trip point is in fact responsible
> for providing BOOST hysteresis. When temperature exceeds 70 deg, the maximal
> non BOOST frequency for Exynos4412 is imposed.
>
> Since the first trigger level has been "stolen" for BOOST, the second one
> needs to be a compromise for the previously used two for non BOOST
> configuration. The 95 deg with modified clip freq (to 400 MHz) shall provide
> a good balance between cooling down the overheated device and throughput on
> an acceptable level.
>
> Two last trigger levels were not modified since, they cause platform shutdown
> on emergency overheat situation.
> Third trip point passage results in SW managed shut down of the system.
> If the last trip point is crossed, the PMU HW generates the power off
> signal.
>
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
> Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>

Reviewed-by: Zhang Rui <rui.zhang@intel.com>

thanks,
rui
>
> ---
> Changes for v12:
> - More verbose patch description to explain new TMU temperature assignment
> for Exynos4412
>
> Changes for v11:
> - Use only one thermal data set
> - Adjust Exynos4412 thermal data to work with or without BOOST
>
> Changes for v10:
> - Remove boost related code from thermal_core.c
> - Use already present thermal infrastructure to provide thermal hysteresis
> - Introduce special set of TMU data for BOOST
>
> Changes for v9:
> - None
>
> Changes for v8:
> - Move cpufreq_boost_* stub functions definition (needed when cpufreq
> is not compiled in) to cpufreq.h at cpufreq core support commit
>
> Changes for v7:
> - None
>
> Changes for v6:
> - Disable boost only when supported and enabled
> - Protect boost related thermal_zone_device struct fields with mutex
> - Evaluate temperature trend during boost enable decision
> - Create separate methods to handle boost enable/disable
> (thermal_boost_{enable|disable}) operations
> - Boost is disabled at any trip point passage (not only the non critical one)
> - Add stub definitions for cpufreq boost functions used when
> CONFIG_CPU_FREQ is NOT defined.
>
> Changes for v5:
> - Move boost disable code from cpu_cooling.c to thermal_core.c
> (to handle_non_critical_trips)
> - Extent struct thermal_zone_device by adding overheated bool flag
> - Implement auto enable of boost after device cools down
> - Introduce boost_polling flag, which indicates if thermal uses it's predefined
> pool delay or has woken up thermal workqueue only to wait until device
> cools down.
>
> Changes for v4:
> - New patch
>
> drivers/thermal/samsung/exynos_tmu_data.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
> index 073c292..476b768 100644
> --- a/drivers/thermal/samsung/exynos_tmu_data.c
> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
> @@ -131,8 +131,8 @@ static const struct exynos_tmu_registers exynos4412_tmu_registers = {
>
> #define EXYNOS4412_TMU_DATA \
> .threshold_falling = 10, \
> - .trigger_levels[0] = 85, \
> - .trigger_levels[1] = 103, \
> + .trigger_levels[0] = 70, \
> + .trigger_levels[1] = 95, \
> .trigger_levels[2] = 110, \
> .trigger_levels[3] = 120, \
> .trigger_enable[0] = true, \
> @@ -155,12 +155,12 @@ static const struct exynos_tmu_registers exynos4412_tmu_registers = {
> .second_point_trim = 85, \
> .default_temp_offset = 50, \
> .freq_tab[0] = { \
> - .freq_clip_max = 800 * 1000, \
> - .temp_level = 85, \
> + .freq_clip_max = 1400 * 1000, \
> + .temp_level = 70, \
> }, \
> .freq_tab[1] = { \
> - .freq_clip_max = 200 * 1000, \
> - .temp_level = 103, \
> + .freq_clip_max = 400 * 1000, \
> + .temp_level = 95, \
> }, \
> .freq_tab_count = 2, \
> .registers = &exynos4412_tmu_registers, \