archive mirror
 help / color / mirror / Atom feed
From: Grzegorz Jaszczyk <>
Subject: [PATCH v2 0/2] introduce watchdog_dev_suspend/resume
Date: Fri, 18 Jun 2021 21:50:31 +0200	[thread overview]
Message-ID: <> (raw)

Hi All,

The following is a v2 version of the series [1] that fixes system hang which
occurs when the ping worker fires after wdog suspend and before wdog resume.
This happens because the ping worker can issue low-level ping while the wdog clk
was disabled by the suspend routine (accessing hw wdog registers while they are
not fed by the clk).

To overcome this issue two patches were introduced. Patch #1 introduces pm
notifier in the watchdog core which will call watchdog_dev_suspend/resume and
actually cancel ping worker during suspend and restore it back, if needed,
during resume.

Patch #2 introduces relevant changes to imx2_wdt driver and notifies wdog core
to stop ping worker on suspend.


Best regards,

Grzegorz Jaszczyk (2):
  watchdog: introduce watchdog_dev_suspend/resume
  watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend

 drivers/watchdog/imx2_wdt.c      |  1 +
 drivers/watchdog/watchdog_core.c | 37 +++++++++++++++++++++++++
 drivers/watchdog/watchdog_dev.c  | 47 ++++++++++++++++++++++++++++++++
 include/linux/watchdog.h         | 10 +++++++
 4 files changed, 95 insertions(+)


             reply	other threads:[~2021-06-18 19:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-18 19:50 Grzegorz Jaszczyk [this message]
2021-06-18 19:50 ` [PATCH v2 1/2] watchdog: " Grzegorz Jaszczyk
2021-06-28 14:04   ` Guenter Roeck
2021-06-18 19:50 ` [PATCH v2 2/2] watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend Grzegorz Jaszczyk
2021-06-28 14:02   ` Guenter Roeck
2021-07-21  7:51 ` [PATCH v2 0/2] introduce watchdog_dev_suspend/resume Grzegorz Jaszczyk

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 \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH v2 0/2] introduce watchdog_dev_suspend/resume' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

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).