linux-kernel - [PATCH v2 0/2] serial: core: fix broken console after suspend

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Message-Id: <20230405111559.110220-1-lma@semihalf.com>
Date:   Wed,  5 Apr 2023 13:15:57 +0200
From:   Lukasz Majczak <lma@...ihalf.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        upstream@...ihalf.com, Lukasz Majczak <lma@...ihalf.com>
Subject: [PATCH v2 0/2] serial: core: fix broken console after suspend

This is v2 of a patch[1].
v1->v2:
* Fixed typos in commit message
* Tested[2] patch "serial: core: preserve cflags, ispeed and ospeed" on all
  current LTS kernels (4.14, 4.19, 5.4, 5.10, 5.15, 6.1) and on top of
  6.3-rc5 with positive results - console was working after resume
* During tests another issue was observed  on 6.1+ - FIFO not enabled after
  resume - and an additional change was needed ("serial: core: enable
  FIFO after resume")
* Test procedure:
  1) ensure the console output is ok
  2) suspend device with "echo freeze > /sys/power/state"
     (/sys/module/printk/parameters/console_suspend == N)
  3) resume device and check the console output
  4) suspend device with "echo freeze > /sys/power/state"
     (/sys/module/printk/parameters/console_suspend == Y)
  5) resume device and check the console output

[1] https://lore.kernel.org/lkml/20230301075751.43839-1-lma@semihalf.com/
[2] Test platforms: PC with i5-8400 + GB H370M D3H
		    HP Elite c1030 Chromebook Enterprise i5-10310U

Lukasz Majczak (2):
  serial: core: preserve cflags, ispeed and ospeed
  serial: core: enable FIFO after resume

 drivers/tty/serial/serial_core.c | 57 +++++++++++++++-----------------
 1 file changed, 27 insertions(+), 30 deletions(-)

-- 
2.40.0.577.gac1e443424-goog