Re: [PATCH v3 0/2] i2c: imx: fix SMBus block-read of 0 locking the bus

Wolfram Sang <[email protected]>
Newsgroups org.kernel.vger.linux-i2c,dev.linux.lists.imx,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel,org.kernel.vger.stable
Message-ID <alZZmzQrnBptGEMQ@shikoro> 
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.

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