linux-kernel - Re: [PATCH v3 3/6] i3c: master: svc: fix ibi may not return mandatory data byte

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Message-ID: <20231020154936.55a499ad@xps-13>
Date:   Fri, 20 Oct 2023 15:49:36 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Frank Li <Frank.Li@....com>
Cc:     alexandre.belloni@...tlin.com, conor.culhane@...vaco.com,
        imx@...ts.linux.dev, joe@...ches.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] i3c: master: svc: fix ibi may not return
 mandatory data byte

Hi Frank,

Frank.Li@....com wrote on Thu, 19 Oct 2023 18:27:22 -0400:

> MSTATUS[RXPEND] is only updated after the data transfer cycle started. This
> creates an issue when the I3C clock is slow, and the CPU is running fast
> enough that MSTATUS[RXPEND] may not be updated when the code reaches
> checking point. As a result, mandatory data can be missed.
> 
> Add a wait for MSTATUS[COMPLETE] to ensure that all mandatory data is
> already in FIFO. It also works without mandatory data.
> 
> Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Frank Li <Frank.Li@....com>

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

Thanks,
Miquèl