linux-kernel - Re: [Regression] Commit "ACPI: PM: Allow transitions to D0 to occur in special cases"

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Date:   Thu, 01 Aug 2019 00:20:49 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Anthony Wong <anthony.wong@...onical.com>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] Commit "ACPI: PM: Allow transitions to D0 to occur in special cases"

On Wednesday, July 31, 2019 6:04:29 PM CEST Kai-Heng Feng wrote:
> Hi,
> 
> After commit "ACPI: PM: Allow transitions to D0 to occur in special cases”,  
> Thunderbolt on XPS 9380 spews the following when it runtime resumes:
> [   36.136554] pci_raw_set_power_state: 25 callbacks suppressed
> [   36.136558] pcieport 0000:03:00.0: Refused to change power state,  
> currently in D3
> [   36.143850] pcieport 0000:04:04.0: Refused to change power state,  
> currently in D3
> [   36.150796] pcieport 0000:04:00.0: Refused to change power state,  
> currently in D3
> [   36.157138] pcieport 0000:04:01.0: Refused to change power state,  
> currently in D3
> [   36.162635] pcieport 0000:04:02.0: Refused to change power state,  
> currently in D3

Thanks for identifying the offending commit and sorry for the breakage.

The patch below should fix it.

---
 drivers/acpi/device_pm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-pm/drivers/acpi/device_pm.c
===================================================================
--- linux-pm.orig/drivers/acpi/device_pm.c
+++ linux-pm/drivers/acpi/device_pm.c
@@ -236,13 +236,15 @@ int acpi_device_set_power(struct acpi_de
 		if (device->power.flags.power_resources)
 			result = acpi_power_transition(device, target_state);
 	} else {
+		int cur_state = device->power.state;
+
 		if (device->power.flags.power_resources) {
 			result = acpi_power_transition(device, ACPI_STATE_D0);
 			if (result)
 				goto end;
 		}
 
-		if (device->power.state == ACPI_STATE_D0) {
+		if (cur_state == ACPI_STATE_D0) {
 			int psc;
 
 			/* Nothing to do here if _PSC is not present. */