linux-kernel - Re: [PATCH] I2C: JZ4780: Fix bug for Ingenic X1000.

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Date:   Wed, 31 Mar 2021 09:18:35 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc:     paul@...pouillou.net, stable@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, dongsheng.qiu@...enic.com,
        aric.pzqi@...enic.com, sernia.zhou@...mail.com
Subject: Re: [PATCH] I2C: JZ4780: Fix bug for Ingenic X1000.

Hi, 

> > Any write operation? I wonder then why nobody noticed before?
> 
> 
> The standard I2C communication should look like this:
> 
> Read:
> 
> device_addr + w, reg_addr, device_addr + r, data;
> 
> Write:
> 
> device_addr + w, reg_addr, data;
> 
> 
> But without this patch, it looks like this:
> 
> Read:
> 
> device_addr + w, reg_addr, device_addr + r, data;
> 
> Write:
> 
> device_addr + w, reg_addr, device_addr + w, data;
> 
> This is clearly not correct.

Thanks for the additional information! I understand now. I added a bit
of this to the commit message of v2 to explain the situation.


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