linux-kernel - [PATCH 0/3] i2c: imx: Fix handling of arbitration loss

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Message-ID: <20200917122029.11121-1-ceggers@arri.de>
Date:   Thu, 17 Sep 2020 14:20:26 +0200
From:   Christian Eggers <ceggers@...i.de>
To:     Oleksij Rempel <linux@...pel-privat.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
CC:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        <linux-i2c@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] i2c: imx: Fix handling of arbitration loss

On my (noisy) system, I2C arbitration losses happen quite often. In it's
current implementation, the IAL flag is partly handled, but has a
number of shortcomings:

1. The driver runs unnecessarily in a timeout when waiting for an
interrupt.

2. The driver performs 500 ms busy-waiting without any value.

3. Arbitration loss errors may be reported one transfer later than they
occured.

Best regards
Christian