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Date: Thu, 16 Jul 2026 17:03:01 +0200
From: Andi Shyti <andi.shyti@kernel.org>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Vincent Jardin <vjardin@free.fr>, 
	Oleksij Rempel <o.rempel@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, 
	Frank Li <Frank.Li@nxp.com>, Sascha Hauer <s.hauer@pengutronix.de>, 
	Fabio Estevam <festevam@gmail.com>, Wolfram Sang <wsa@kernel.org>, 
	Kaushal Butala <kaushalkernelmailinglist@gmail.com>, Shawn Guo <shawn.guo@freescale.com>, 
	Stefan Eichenberger <stefan.eichenberger@toradex.com>, linux-i2c@vger.kernel.org, imx@lists.linux.dev, 
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, 
	Carlos Song <carlos.song@nxp.com>, Stefan Eichenberger <eichest@gmail.com>
Subject: Re: [PATCH v3 0/2] i2c: imx: fix SMBus block-read of 0 locking the
 bus
Message-ID: <aljyYViyNwN0MjGQ@zenone.zhora.eu>
References: <20260713-for-upstream-i2c-lx2160-fix-v1-v3-0-073ac9e103a5@free.fr>
 <alZZmzQrnBptGEMQ@shikoro>
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In-Reply-To: <alZZmzQrnBptGEMQ@shikoro>

On Tue, Jul 14, 2026 at 05:45:31PM +0200, Wolfram Sang wrote:
> On Mon, Jul 13, 2026 at 08:11:58PM +0200, Vincent Jardin wrote:
> > i2c-imx rejects an SMBus Block Read byte count of 0 (valid per SMBus 3.1
> > 6.5.7) as -EPROTO and returns without emitting a NACK + STOP, leaving the
> > target holding SDA so the bus stays stuck until a power cycle.
> 
> Bigger picture: Linux does not support SMBus3 which also allows byte
> counts of up to 255. I started sketching support for all that but could
> never implement it.

Yeah... I have claimed many times to have patches that add
support to smbus3. I also promised many times that I should
update and send them over :-)

Andi

> That being said, despite no SMBus3 support, it should not hang the bus
> like here.