archive mirror
 help / color / mirror / Atom feed
From: Sudip Mukherjee <>
To: Wander Lairson Costa <>
Cc: Greg Kroah-Hartman <>,
	Linus Torvalds <>,, Jiri Slaby <>,
Subject: Regression with 5021d709b31b ("tty: serial: Use fifo in 8250 console driver")
Date: Thu, 27 Jan 2022 23:24:03 +0000	[thread overview]
Message-ID: <YfMpk7DM9zA7NfmI@debian> (raw)

Hi Wander,

Not sure if this has been reported before but since last few weeks I am
seeing a problem with the rpi4 serial port on my test setup. The initial
boot message will be completely garbled as you can see at:
The last good boot was

The bisect log:

# bad: [455e73a07f6e288b0061dfcf4fcf54fa9fe06458] Merge tag 'clk-for-linus' of git://
# good: [7e7b69654724c72bd3219b71f58937845dca0b2b] Merge tag 'dma-mapping-5.17' of git://
git bisect start '455e73a07f6e288b0061dfcf4fcf54fa9fe06458' '7e7b69654724c72bd3219b71f58937845dca0b2b'
# bad: [342465f5337f7bd5b8bd3b6f939ac12b620cbb43] Merge tag 'tty-5.17-rc1' of git://
git bisect bad 342465f5337f7bd5b8bd3b6f939ac12b620cbb43
# good: [6dc69d3d0d18d587ab9d809fe060ba4417cf0279] Merge tag 'driver-core-5.17-rc1' of git://
git bisect good 6dc69d3d0d18d587ab9d809fe060ba4417cf0279
# good: [e269f7acdc53623769da31135f60afeb3a65eaff] staging: r8188eu: remove the private ioctl "wps_assoc_req_ie"
git bisect good e269f7acdc53623769da31135f60afeb3a65eaff
# bad: [ad234e2bac274a43c9fa540bde8cd9f0c627b71f] tty: serial: meson: Drop the legacy compatible strings and clock code
git bisect bad ad234e2bac274a43c9fa540bde8cd9f0c627b71f
# good: [c66453ce8af8bac78a72ba4e21fd9a86720127d7] tty: fix kernel-doc in n_tty.c
git bisect good c66453ce8af8bac78a72ba4e21fd9a86720127d7
# good: [0882b473b084df31288003b3bee974aabac9dcf9] tty: serial: samsung: Enable console as module
git bisect good 0882b473b084df31288003b3bee974aabac9dcf9
# bad: [b4a29b94804c4774f22555651296b838df6ec0e4] serial: 8250: Move Alpha-specific quirk out of the core
git bisect bad b4a29b94804c4774f22555651296b838df6ec0e4
# good: [e822b4973f49015e1c6f63b91c8641ed9bfaf229] tty/ldsem: Fix syntax errors in comments
git bisect good e822b4973f49015e1c6f63b91c8641ed9bfaf229
# good: [fb09d0ac07725b442b32dbf53f0ab0bea54804e9] tty: Fix the keyboard led light display problem
git bisect good fb09d0ac07725b442b32dbf53f0ab0bea54804e9
# bad: [5021d709b31b8a14317998a33cbc78be0de9ab30] tty: serial: Use fifo in 8250 console driver
git bisect bad 5021d709b31b8a14317998a33cbc78be0de9ab30
# good: [adbfddc757aec1ed54ccb35c4a7ca9170df827e0] docs/driver-api: Replace a comma in the n_gsm.rst with a double colon
git bisect good adbfddc757aec1ed54ccb35c4a7ca9170df827e0
# first bad commit: [5021d709b31b8a14317998a33cbc78be0de9ab30] tty: serial: Use fifo in 8250 console driver

And, indeed reverting 5021d709b31b ("tty: serial: Use fifo in 8250 console
driver") on top of 23a46422c561 ("Merge tag 'net-5.17-rc2' of
git://") fixes the problem
for me.

This is seen on every boot and I will be happy to test any patch.


             reply	other threads:[~2022-01-27 23:24 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-27 23:24 Sudip Mukherjee [this message]
2022-01-28  4:59 ` Regression with 5021d709b31b ("tty: serial: Use fifo in 8250 console driver") Thorsten Leemhuis
2022-01-28  7:15 ` Greg Kroah-Hartman
2022-01-28 12:30 ` Wander Costa
2022-01-31 12:58   ` Sudip Mukherjee
2022-01-31 13:22     ` Wander Costa

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YfMpk7DM9zA7NfmI@debian \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).