linux-kernel - RE: [PATCH 07/11] i2c: imx-lpi2c: increase PM timeout to avoid operate clk frequently

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Message-ID: <AM6PR04MB4966BD849AF2D26DD097851A80689@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Fri, 19 Mar 2021 05:10:53 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Clark Wang <xiaoning.wang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 07/11] i2c: imx-lpi2c: increase PM timeout to avoid
 operate clk frequently

> From: Clark Wang <xiaoning.wang@....com>
> Sent: Wednesday, March 17, 2021 2:54 PM
> 
> Switching the clock frequently will affect the data transmission efficiency, and
> prolong the timeout to reduce autosuspend times for lpi2c.
> 
> Acked-by: Fugang Duan <fugang.duan@....com>
> Signed-off-by: Clark Wang <xiaoning.wang@....com>

Reviewed-by: Dong Aisheng <aisheng.dong@....com>

Regards
Aisheng

> ---
>  drivers/i2c/busses/i2c-imx-lpi2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index 86b69852f7be..c0cb77c66090 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -75,7 +75,7 @@
>  #define I2C_CLK_RATIO	2
>  #define CHUNK_DATA	256
> 
> -#define I2C_PM_TIMEOUT		10 /* ms */
> +#define I2C_PM_TIMEOUT		1000 /* ms */
> 
>  enum lpi2c_imx_mode {
>  	STANDARD,	/* 100+Kbps */
> --
> 2.25.1