linux-kernel - Re: [PATCH] thermal/drivers/mediatek/lvts_thermal: Remove redundant code in lvts_ctrl

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Date: Wed, 10 Apr 2024 11:55:42 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Pin-yen Lin <treapking@...omium.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 "Rafael J . Wysocki" <rafael@...nel.org>, Zhang Rui <rui.zhang@...el.com>,
 Lukasz Luba <lukasz.luba@....com>, Matthias Brugger
 <matthias.bgg@...il.com>, Nicolas Pitre <nico@...xnic.net>
Cc: linux-arm-kernel@...ts.infradead.org,
 Alexandre Mergnat <amergnat@...libre.com>, linux-kernel@...r.kernel.org,
 linux-mediatek@...ts.infradead.org,
 Nícolas F . R . A . Prado <nfraprado@...labora.com>,
 Minjie Du <duminjie@...o.com>, linux-pm@...r.kernel.org,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Balsam CHIHI <bchihi@...libre.com>
Subject: Re: [PATCH] thermal/drivers/mediatek/lvts_thermal: Remove redundant
 code in lvts_ctrl_configure

Il 10/04/24 02:07, Pin-yen Lin ha scritto:
> The removed variable assignment is never written to the register, so it
> has no effect on the device behavior.  Mediatek has confirmed that it
> is not required to initialize this register for current platforms, so
> remove this segment to avoid confusion.
> 
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> 

Added Nicolas Pitre to the loop;

Nicolas, since you're pushing support for those, can you please check if CALSCALE
is used/useful/necessary on MT8186/88 before I give a R-b to this commit?

P.S.: Can anyone from MediaTek please confirm if the 0x300 value is right for this
       register? I'd still like Linux to properly initialize the registers, even if
       this could technically be a default value.

> ---
> 
>   drivers/thermal/mediatek/lvts_thermal.c | 6 ------
>   1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
> index fd4bd650c77a..48d2f8ba3f18 100644
> --- a/drivers/thermal/mediatek/lvts_thermal.c
> +++ b/drivers/thermal/mediatek/lvts_thermal.c
> @@ -985,12 +985,6 @@ static int lvts_ctrl_configure(struct device *dev, struct lvts_ctrl *lvts_ctrl)
>   	value = LVTS_TSSEL_CONF;
>   	writel(value, LVTS_TSSEL(lvts_ctrl->base));
>   
> -	/*
> -	 * LVTS_CALSCALE : ADC voltage round
> -	 */
> -	value = 0x300;
> -	value = LVTS_CALSCALE_CONF;

As a side note, I believe that the original author wanted to write, instead...

	value = LVTS_CALSCALE_CONF;
	writel(value, LVTS_CALSCALE(lvts_ctrl->base);

Cheers,
Angelo

> -
>   	/*
>   	 * LVTS_MSRCTL0 : Sensor filtering strategy
>   	 *