linux-kernel - Re: [PATCH] i2c: omap: fix IRQ storms

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Message-Id: <137529D7-D8A6-458B-9658-2998F31239FD@goldelico.com>
Date: Fri, 28 Feb 2025 10:49:18 +0100
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Andreas Kemnade <andreas@...nade.info>
Cc: Nishanth Menon <nm@...com>,
 Andi Shyti <andi.shyti@...nel.org>,
 "Raghavendra, Vignesh" <vigneshr@...com>,
 Aaro Koskinen <aaro.koskinen@....fi>,
 Kevin Hilman <khilman@...libre.com>,
 Roger Quadros <rogerq@...nel.org>,
 Tony Lindgren <tony@...mide.com>,
 Janusz Krzysztofik <jmkrzyszt@...il.com>,
 Reid Tonking <reidt@...com>,
 wsa@...nel.org,
 Linux-OMAP <linux-omap@...r.kernel.org>,
 linux-i2c@...r.kernel.org,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 stable@...nel.org
Subject: Re: [PATCH] i2c: omap: fix IRQ storms

Hi Andreas,

> Am 27.02.2025 um 22:47 schrieb Andreas Kemnade <andreas@...nade.info>:
> 
> For reference, the sensor involved was the BMG160. Because it is not
> enabled in omap2plus_defconfig, the issue did not show up early.
> From my understanding, that there is a NACK after the reset command
> data byte is sent. @Nikolaus: are there any nice and simple test points
> for a scope?

According to schematics [1] you can either tap the I2C bus at the camera connector
(pins 3 and 5) or R206 and R207.

For the camera connector you would need a flex cable that fits the SD-52437-2471
connector.

The resistors are located near the pogo pin connector for the right speaker (all
are near the antenna connector). If you need a photo please let me know.
It would be better to solder tiny wires...

BR,
Nikolaus

[1]: https://projects.goldelico.com/p/gta04-main/downloads/48/