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From: bugzilla-daemon@kernel.org
To: linux-iio@vger.kernel.org
Subject: [Bug 218578] MXC6655 accelerometer not working with MXC4005 driver
Date: Thu, 14 Mar 2024 09:35:54 +0000	[thread overview]
Message-ID: <bug-218578-217253-TzlONxVF79@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-218578-217253@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=218578

--- Comment #8 from Hans de Goede (jwrdegoede@fedoraproject.org) ---
Thanks.

So I've taken a look at the driver and I noticed that it does not reset the
chip on probe. So maybe sometimes the chip comes up in a weird state and we
need to modify the driver to reset it on probe.

Can you try the following:

First install i2c-tools:

sudo dnf install i2c-tools

Then do a cold boot, check the accelerometer works and then do:

sudo i2cdump -y -f -r 0-15 0 0x15

And copy and paste the output to a "i2cdump-good.txt" .

Then reboot until the accelerometer stops working, then do:

sudo i2cdump -y -f -r 0-15 0 0x15

And copy and paste the output to a "i2cdump-bad.txt" .

Now on this broken setup lets try to reset the accelerometer:

sudo i2cset -y -f 0 0x15 0x01 0x10

This writes 0x10 to register 0x01 which sets the SW_RST bit

And then check if the accelerometer now has started working.

Also please make another dump after the reset (from bad state):

sudo i2cdump -y -f -r 0-15 0 0x15

And copy and paste the output to a "i2cdump-after-reset.txt" .

Hopefully these dumps will help us figure out what is going on.

If you are interested in poking more at this yourself, there is a datasheet
available here:
https://media.digikey.com/pdf/Data%20Sheets/MEMSIC%20PDFs/MXC6655XA_Rev_A_1-22-20.pdf

This should allow you to interpret the contents of the dumps.

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next prev parent reply	other threads:[~2024-03-14  9:35 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-09 17:55 [Bug 218578] New: MXC6655 accelerometer not working with MXC4005 driver bugzilla-daemon
2024-03-09 18:05 ` [Bug 218578] " bugzilla-daemon
2024-03-09 18:17 ` bugzilla-daemon
2024-03-10 12:33 ` [Bug 218578] New: " Jonathan Cameron
2024-03-10 12:33 ` [Bug 218578] " bugzilla-daemon
2024-03-11  4:21 ` bugzilla-daemon
2024-03-11  4:34 ` bugzilla-daemon
2024-03-11 18:29 ` bugzilla-daemon
2024-03-13 22:13 ` bugzilla-daemon
2024-03-13 22:14 ` bugzilla-daemon
2024-03-13 22:14 ` bugzilla-daemon
2024-03-14  9:35 ` bugzilla-daemon [this message]
2024-03-14  9:36 ` bugzilla-daemon
2024-03-14  9:37 ` bugzilla-daemon
2024-03-15  2:30 ` bugzilla-daemon
2024-03-15  2:31 ` bugzilla-daemon
2024-03-15  2:32 ` bugzilla-daemon
2024-03-15  2:33 ` bugzilla-daemon
2024-03-15 15:13 ` bugzilla-daemon
2024-03-17 23:45 ` bugzilla-daemon
2024-03-18 10:43 ` bugzilla-daemon
2024-03-20  8:38 ` bugzilla-daemon
2024-03-22 22:09 ` bugzilla-daemon
2024-03-26 11:45 ` bugzilla-daemon
2024-03-26 22:34 ` bugzilla-daemon
2024-03-26 22:37 ` bugzilla-daemon
2024-03-27 14:38 ` bugzilla-daemon
2024-04-04 22:33 ` bugzilla-daemon
2024-04-08 14:31 ` bugzilla-daemon
2024-04-10 22:29 ` bugzilla-daemon
2024-04-10 22:30 ` bugzilla-daemon
2024-04-17 16:57 ` bugzilla-daemon
2024-04-17 17:01 ` bugzilla-daemon
2024-04-17 19:32 ` bugzilla-daemon
2024-04-18 23:08 ` bugzilla-daemon
2024-04-19  7:37 ` bugzilla-daemon

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