linux-kernel - Re: [PATCH 2/2] thermal: rockchip: optimize sensor auto accessing period

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Date:	Thu, 28 Jul 2016 14:53:28 -0700
From:	Stephen Barber <smbarber@...omium.org>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	Brian Norris <briannorris@...omium.org>,
	Rocky Hao <rocky.hao@...k-chips.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Heiko Stuebner <heiko@...ech.de>, linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] thermal: rockchip: optimize sensor auto accessing period

On Wed, Jul 27, 2016 at 7:10 AM, Caesar Wang <wxt@...k-chips.com> wrote:
> From: Rocky Hao <rocky.hao@...k-chips.com>
>
> In less than 10 ms, the temperature of soc will arise 10 degree. 250 ms
> is too big for soc tempeture control. Setting 2.5 ms will speed up
> temperature accessing speed but introduce no more cpu's computing overhead.
> We set AUTO_PERIOD_TIME and TSADCV3_AUTO_PERIOD_HT_TIME the same value,
> because normal temperature update speed is also our consern in IPA.
>
> Signed-off-by: Rocky Hao <rocky.hao@...k-chips.com>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Eduardo Valentin <edubezval@...il.com>
> Cc: Heiko Stuebner <heiko@...ech.de>
> Cc: linux-pm@...r.kernel.org
>
> ---
>
>  drivers/thermal/rockchip_thermal.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
> index a90423d..1f165c9 100644
> --- a/drivers/thermal/rockchip_thermal.c
> +++ b/drivers/thermal/rockchip_thermal.c
> @@ -213,8 +213,8 @@ struct rockchip_thermal_data {
>  #define TSADCV2_HIGHT_TSHUT_DEBOUNCE_COUNT     4
>  #define TSADCV2_AUTO_PERIOD_TIME               250 /* 250ms */
>  #define TSADCV2_AUTO_PERIOD_HT_TIME            50  /* 50ms */
> -#define TSADCV3_AUTO_PERIOD_TIME               187500 /* 250ms */
> -#define TSADCV3_AUTO_PERIOD_HT_TIME            37500  /* 50ms */
> +#define TSADCV3_AUTO_PERIOD_TIME               1875 /* 2.5ms */
> +#define TSADCV3_AUTO_PERIOD_HT_TIME            1875 /* 2.5ms */
>
>  #define TSADCV2_USER_INTER_PD_SOC              0x340 /* 13 clocks */
>
> --
> 1.9.1
>


Tested-by: Stephen Barber <smbarber@...omium.org>

Steve