linux-kernel - Re: [PATCH 1/1] i3c: master: svc: fix IBIWON not set if IBI follow a hot join

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Message-ID: <20240603154918.4b0c95b2@xps-13>
Date: Mon, 3 Jun 2024 15:49:18 +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>, linux-i3c@...ts.infradead.org (moderated
 list:SILVACO I3C DUAL-ROLE MASTER), linux-kernel@...r.kernel.org (open
 list), imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] i3c: master: svc: fix IBIWON not set if IBI follow
 a hot join

Hi Frank,

Frank.Li@....com wrote on Fri, 31 May 2024 11:43:08 -0400:

> When an In-Band Interrupt(IBI) occurs after svc_i3c_master_do_daa_locked(),
> typically triggered during a Hot Join (HJ) event, the IBIWON flag fails to
> be set when issuing an auto IBI command.
> 
> The issue stems from the omission of emitting STOP upon successful
> execution of svc_i3c_master_do_daa_locked(). Consequently, the controller
> interprets it as a repeat start when emitting the auto IBI command. Per the
> I3C specification, an IBI should never occur during a repeat start, thus
> preventing the IBIWON flag from being set.
> 
> Emit STOP regardless of the success or failure of
> svc_i3c_master_do_daa_locked() to match I3C spec requirement.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver")

There was no hot-join support in this commit. You can probably use
instead:

Fixes: 05b26c31a485 ("i3c: master: svc: add hot join support")

Thanks,
Miquèl