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From: Peng Fan <>
	Peng Fan <>
Subject: [RFC] platform: detach from PM domains on shutdown
Date: Tue, 15 May 2018 17:01:10 +0800	[thread overview]
Message-ID: <> (raw)

When reboot Linux, the PM domains attached to a device
are not shutdown. To SoCs which relys on reset the whole SoC,
there is no need to shutdown PM domains, but to Linux running
in a virtual machine with devices pass-through, we could not
reset the whole SoC. Currently we need Linux to shutdown its
PM domains when reboot.

commit 2d30bb0b3889 ("platform: Do not detach from PM domains on shutdown"),
removes what this patch tries to add, because of a warning.
commit e79aee49bcf9 ("PM: Avoid false-positive warnings in dev_pm_domain_set()")
already fixes the false alarm warning. So let's detach the power domain
to shutdown PM domains after driver shutdown.

Signed-off-by: Peng Fan <>

I do not find a better place to shutdown power domain when reboot Linux,
so add back the line that commit 2d30bb0b3889 removes, because it is
a false alarm warning as commit e79aee49bcf9 describes.

 drivers/base/platform.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 8075ddc70a17..a5929f24dc3c 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -616,6 +616,7 @@ static void platform_drv_shutdown(struct device *_dev)
 	if (drv->shutdown)
+	dev_pm_domain_detach(_dev, true);

             reply	other threads:[~2018-05-15  8:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-15  9:01 Peng Fan [this message]
2018-05-16  9:52 ` Ulf Hansson
2018-05-16 12:53   ` Peng Fan
2018-05-16 21:34   ` Rafael J. Wysocki
2018-05-17  2:33     ` Peng Fan
2018-05-17  8:01       ` Rafael J. Wysocki
2018-05-17 12:37         ` Peng Fan
2018-05-18  7:54           ` Rafael J. Wysocki
2018-05-18  8:53             ` Peng Fan
2018-05-28  8:01               ` Peng Fan
2018-05-28  8:31                 ` Rafael J. Wysocki
2018-05-29  7:52                   ` Peng Fan

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