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Message-ID: <20210331071835.GB1025@ninjato>
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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