From: Hermann Lauer <Hermann.Lauer@iwr.uni-heidelberg.de>
To: gregory.clement@bootlin.com
Cc: linux-i2c@vger.kernel.org
Subject: I2C MV64XXX: Showing Allwinner debug LCR register in bus lock case
Date: Thu, 29 Jul 2021 09:31:00 +0200 [thread overview]
Message-ID: <20210729073100.GA8757@lemon.iwr.uni-heidelberg.de> (raw)
Dear Maintainers,
if Allwinner i2c locks, the is a LCR register (reg_base + 0x20),
which shows directly the state of the SCL and SDA lines. So you can
see which line (if any) is pulled externally low.
Is there a similar usefull register in the original MV64XXX MARVELL chip?
I'd like to make the patch https://bitbucket.org/hlauer/kernel/src/master/patches/i2c-buslock.patchl working for that chip, too.
Thanks for any ideas.
Greetings
Hermann
--
Administration/Zentrale Dienste, Interdiziplinaeres
Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg
IWR; INF 205; 69120 Heidelberg; Tel: (06221)54-14405 Fax: -14427
Email: Hermann.Lauer@iwr.uni-heidelberg.de
next reply other threads:[~2021-07-29 7:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 7:31 Hermann Lauer [this message]
2021-07-30 14:28 ` I2C MV64XXX: Showing Allwinner debug LCR register in bus lock case Gregory CLEMENT
2021-08-23 14:38 ` Hermann.Lauer
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