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From: Kristian Evensen <kristian.evensen@gmail.com>
To: linux-i2c@vger.kernel.org
Subject: mt7621 i2c fails with upstream driver
Date: Wed, 5 Jan 2022 10:51:38 +0100	[thread overview]
Message-ID: <CAKfDRXgUvN19PUd_ebRJs-k_ytrGwgA=e6d3QJ9cwJogUGpoyw@mail.gmail.com> (raw)

Hello,

I am in the process of bringing kernel 5.10 up on an mt7621-based
board. The board is equipped with a temperature sensor that is
connected to the i2c bus. Reading the temperature worked fine with my
previous kernel (OpenWRT 4.14/downstream i2c driver), but fails when I
use the upstream driver.

With the 5.10 i2c-mt7621-driver, i2cdetect is no longer able to detect
the sensor and i2cget fails with "Error: Read failed". An strace of
i2cget reveals the cause to be the final ioctl call failing with
ETIMEDOUT.

Replacing the new with the old driver makes i2c work again, but I
would like to try to avoid that. My knowledge of i2c is very limited,
so I wondered if anyone knows what could be wrong or have any
suggestions on things I can try to for example change in the driver?

Thanks in advance for any help,
Kristian

             reply	other threads:[~2022-01-05  9:51 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-05  9:51 Kristian Evensen [this message]
2022-01-05 11:45 ` mt7621 i2c fails with upstream driver Kristian Evensen
2022-01-06 13:23 ` Wolfram Sang

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