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

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Message-ID: <20240826183550.39d36e0e@xps-13>
Date: Mon, 26 Aug 2024 18:35:50 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.li@....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

Hi Frank,

Frank.li@....com wrote on Mon, 26 Aug 2024 12:04:44 -0400:

> 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.

I understand you may not experience the problem, but the solution must
not disturb setups without the problem either. That's why I was asking.

Thanks,
Miquèl