linux-kernel - Re: [PATCH 1/1] i3c: master: svc: Modify enabled_events bit 7:0 to act as IBI enable counter

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Message-ID: <20241025161020.11765f79@xps-13>
Date: Fri, 25 Oct 2024 16:10:20 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.li@....com>
Cc: Conor Culhane <conor.culhane@...vaco.com>, Alexandre Belloni
 <alexandre.belloni@...tlin.com>, Clark Wang <xiaoning.wang@....com>,
 "moderated list:SILVACO I3C DUAL-ROLE MASTER"
 <linux-i3c@...ts.infradead.org>, open list <linux-kernel@...r.kernel.org>,
 imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] i3c: master: svc: Modify enabled_events bit 7:0 to
 act as IBI enable counter

Hi Frank,

Frank.li@....com wrote on Fri, 25 Oct 2024 10:00:50 -0400:

> On Fri, Oct 25, 2024 at 09:53:18AM +0200, Miquel Raynal wrote:
> > Hi Frank,
> >
> > Frank.Li@....com wrote on Thu, 24 Oct 2024 16:38:55 -0400:
> >  
> > > Fix issue where disabling IBI on one device disables the entire IBI
> > > interrupt. Modify bit 7:0 of enabled_events to serve as an IBI enable  
> >
> > Is this bitfield arbitrary?
> >
> > Is there a rationale behind it?  
> 
> Max devices number under a I3C bus is 128 because dynamic address is 7 bit.
> So 8 bits for it should be enough.
> 
> Bit31 as hotjoin, Bit30 reserved as control switch request.

Makes sense.

Thanks,
Miquèl