linux-kernel - Re: [PATCH v3 1/1] pwrap: mediatek: fix FSM timeout issue

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Date:   Mon, 25 Apr 2022 10:05:27 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     Zhiyong Tao <zhiyong.tao@...iatek.com>, <lee.jones@...aro.org>,
        <robh+dt@...nel.org>, <matthias.bgg@...il.com>,
        <lgirdwood@...il.com>, <broonie@...nel.org>,
        <eddie.huang@...iatek.com>, <a.zummo@...ertech.it>,
        <alexandre.belloni@...tlin.com>, <fshao@...omium.org>
CC:     <srv_heupstream@...iatek.com>, <hui.liu@...iatek.com>,
        <tinghan.shen@...iatek.com>, <hsin-hsiung.wang@...iatek.com>,
        <sean.wang@...iatek.com>, <macpaul.lin@...iatek.com>,
        <wen.su@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-rtc@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3 1/1] pwrap: mediatek: fix FSM timeout issue

On Sun, 2022-04-24 at 10:57 +0800, Zhiyong Tao wrote:
> From: "Zhiyong.Tao" <zhiyong.tao@...iatek.com>
> 
> Fix pwrap FSM timeout issue which leads the system crash on GFX VSRAM
> power on.
> Add a usleep delay to avoid busy read for the H/W status.
> For avoiding the system behavior(ex. disable interrupt in
> suspend/resume
> flow, schedule block task)cause if (time_after()) be turn first,
> we change it after sleep delay.
> Fixes: 1f022d84bd19 ("soc: mediatek: Add PMIC wrapper for MT8135 and
> MT8173 SoCs")
> 
> Signed-off-by: Zhiyong.Tao <zhiyong.tao@...iatek.com>
> ---

Hello Zhiyong,

IMO, commit messages should be

Fix pwrap FSM timeout issue....
...we change it after sleep delay.

(=> one blank)
Fixes: 1f022d84bd19 ("soc: mediatek: Add PMIC wrapper for MT8135 and
MT8173 SoCs")
(=> oneline)

Signed-off-by: Zhiyong.Tao <zhiyong.tao@...iatek.com>

>  drivers/soc/mediatek/mtk-pmic-wrap.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c
> b/drivers/soc/mediatek/mtk-pmic-wrap.c
> index 952bc554f443..ac7139a67e87 100644
> --- a/drivers/soc/mediatek/mtk-pmic-wrap.c
> +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
> @@ -12,6 +12,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
> +#include <linux/delay.h>

Sorry, I do not notice this in previous version. It will proper order
the header in alphabet.

 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>

BRs,
Rex
>  
>  #define PWRAP_MT8135_BRIDGE_IORD_ARB_EN		0x4
>  #define PWRAP_MT8135_BRIDGE_WACS3_EN		0x10
> @@ -1197,10 +1198,13 @@ static int pwrap_wait_for_state(struct
> pmic_wrapper *wrp,
>  	timeout = jiffies + usecs_to_jiffies(10000);
>  
>  	do {
> -		if (time_after(jiffies, timeout))
> -			return fp(wrp) ? 0 : -ETIMEDOUT;
>  		if (fp(wrp))
>  			return 0;
> +
> +		usleep_range(10, 11);
> +
> +		if (time_after(jiffies, timeout))
> +			return fp(wrp) ? 0 : -ETIMEDOUT;
>  	} while (1);
>  }
>