linux-kernel - Re: [PATCH v3] i2c: i801: Safely share SMBus with BIOS/ACPI

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Message-ID: <20220720192118.x6ayiar7zmavhauu@X1C7EK5>
Date:   Wed, 20 Jul 2022 21:21:18 +0200
From:   Ettore Chimenti <ek5.chimenti@...il.com>
To:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Hector Martin <marcan@...can.st>, Jean Delvare <jdelvare@...e.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Wolfram Sang <wsa@...nel.org>,
        Marco Sogli <marco.sogli@...o.com>
Subject: Re: [PATCH v3] i2c: i801: Safely share SMBus with BIOS/ACPI

Tested on a SECO SBC-B68 and a UDOO X86.
The BIOS AML code queries the Embedded Controller over SMBus, 
respecting the hardware semaphore implementation.

I get this line on kernel log and everything works as expected.
[    7.270172] i801_smbus 0000:00:1f.3: SMBus controller is shared with ACPI AML. This seems safe so far.

Tested with continous use of i2c-tools (i2cdump) with temperature reads
in thermal_zone (that triggers AML code).

Tested-by: Ettore Chimenti <ek5.chimenti@...il.com>