linux-kernel - Re: [PATCH] i2c-imx.c: Synthesize end of transaction events without idle interrupts

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Message-ID: <20210128092048.GK963@ninjato>
Date:   Thu, 28 Jan 2021 10:20:48 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Kevin Herbert <kph@...tinasystems.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Biwen Li <biwen.li@....com>, Leo Li <leoyang.li@....com>,
        linux@...pel-privat.de, kernel@...gutronix.de, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com,
        Aisheng Dong <aisheng.dong@....com>,
        Clark Wang <xiaoning.wang@....com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiafei Pan <jiafei.pan@....com>,
        Xiaobo Xie <xiaobo.xie@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Biwen Li <biwen.li@....nxp.com>
Subject: Re: [PATCH] i2c-imx.c: Synthesize end of transaction events without
 idle interrupts

On Thu, Jan 14, 2021 at 05:27:11PM -0800, Kevin Herbert wrote:
> The loop sends either one or two events to the slave driver. If the
> state is I2C_SLAVE_READ_REQUESTED, we synthesize the
> I2C_SLAVE_READ_PROCESSED event, and then our state becomes
> I2C_SLAVE_READ_PROCESSED. In all other states, we transition to
> I2C_SLAVE_STOP and exit the loop.
> 
> It is not a busy loop at all. It is calling the callback handler (that
> already expects to be in IRQ context) one or two times, and then it
> exits the loop.

Oleksij, does this answer your question?


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