linux-kernel - Re: [PATCH v3] i3c: master: support to adjust first broadcast address speed

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Message-ID: <ZsynnIWGIlmWPdzW@lizhi-Precision-Tower-5810>
Date: Mon, 26 Aug 2024 12:04:44 -0400
From: Frank Li <Frank.li@....com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: carlos.song@....com, alexandre.belloni@...tlin.com,
	linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-imx@....com
Subject: Re: [PATCH v3] i3c: master: support to adjust first broadcast
 address speed

On Mon, Aug 26, 2024 at 10:13:23AM +0200, Miquel Raynal wrote:
> Hi Carlos,
>
> carlos.song@....com wrote on Mon, 26 Aug 2024 13:09:57 +0800:
>
> > From: Carlos Song <carlos.song@....com>
> >
> > According to I3C spec 6.2 Timing Specification, the Open Drain High Period
> > of SCL Clock timing for first broadcast address should be adjusted to 200ns
> > at least. I3C device working as i2c device will see the broadcast to close
> > its Spike Filter then change to work at I3C mode. After that I3C open drain
> > SCL high level should be adjusted back.
> >
> > Signed-off-by: Carlos Song <carlos.song@....com>
> > Reviewed-by: Frank Li <Frank.Li@....com>
>
> Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
>
> Frank, did you test it with eg. the Silvaco master?

This problem only existed on one board with specific i2c devices. I have
not such boards in hand. Carlos work closely with me and tested by our test
team.

Frank

>
> Thanks,
> Miquèl