linux-kernel - Re: [PATCH] i2c: piix4: Add support for I2C block data transactions

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Message-ID: <aWo_DJRp_GwRG7p1@zenone.zhora.eu>
Date: Fri, 16 Jan 2026 14:38:22 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: "Qing Chang (qinchang)" <qinchang@...co.com>
Cc: "Jean Delvare   (maintainer:I2C/SMBUS CONTROLLER DRIVERS FOR PC)" <jdelvare@...e.com>, 
	"open list:I2C/SMBUS CONTROLLER DRIVERS FOR PC" <linux-i2c@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: piix4: Add support for I2C block data transactions

Hi Jean,

any thought on this?
On Tue, Dec 09, 2025 at 03:30:31AM +0000, Qing Chang (qinchang) wrote:
> From 329a0f951071c03b75a92e6b3c5746d9ee002935 Mon Sep 17 00:00:00 2001
> 
> -
> From: Qing Chang <qinchang@...co.com>
> Date: Sun, 30 Nov 2025 19:30:36 -0800
> Subject: [PATCH] i2c: piix4: Add support for I2C block data transactions
> 
> Add support for I2C_SMBUS_I2C_BLOCK_DATA protocol to the PIIX4 SMBus
> driver. This enables I2C block read/write operations where the master
> specifies the transfer length, unlike SMBus block data where the slave
> provides the length.
> 
> Key changes:
> - Add PIIX4_I2C_BLOCK_DATA protocol constant (0x18)
> - Implement I2C block write: first data byte to SMBHSTDAT0, rest to SMBBLKDAT
> - Implement I2C block read: pre-specify length, read first byte from
>   SMBHSTDAT0, rest from SMBBLKDAT
> - Update piix4_func() to advertise I2C_FUNC_SMBUS_I2C_BLOCK support
> - Add IMC notification for SB800 series chips
> 
> Signed-off-by: Qing Chang <qinchang@...co.com>

the commit log is a bit screwed up, but nothing that can't be
fixed without resending :-)

Let's wait for Jean.

Andi