linux-kernel - [PATCH V2] ACPI: Support D3 COLD device in old BIOS for ZPODD

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Date:	Wed, 9 Dec 2015 16:17:30 +0800
From:	Ken Xue <ken.xue@....com>
To:	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<rjw@...ysocki.net>
CC:	<lenb@...nel.org>, <SPG_Linux_Kernel@....com>,
	<mika.westerberg@...ux.intel.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	<Ivan.Zheng@....com>, <Alex.Chuang@....com>, <tj@...nel.org>,
	<stern@...land.harvard.edu>
Subject: [PATCH V2] ACPI: Support D3 COLD device in old BIOS for ZPODD

D3cold is only regarded as valid if the "_PR3" object is
present for the given device after the commit 20dacb71ad28
("ACPI/PM: Rework device power management to follow ACPI 6").

But some old BIOS only defined "_PS3" for the D3COLD device,
such as ZPODD device. And old kernel also believes the device with
"_PS3" is a D3COLD device.

So, add some logics for supporting D3 COLD device with old BIOS
which is compatible with earlier ACPI spec and kernel behavior.

Reference:
http://marc.info/?l=linux-acpi&m=144946938709759&w=2

Signed-off-by: Ken Xue <Ken.Xue@....com>
Reported-and-tested-by: Gang Long <Gang.Long@....com>
---
 include/acpi/acpi_bus.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ad0a5ff..9894b75 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -631,7 +631,9 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 
 static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 {
-	return adev->power.states[ACPI_STATE_D3_COLD].flags.valid;
+	return adev->power.states[ACPI_STATE_D3_COLD].flags.valid ||
+		((acpi_gbl_FADT.header.revision < 6) &&
+		adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
 }
 
 #else	/* CONFIG_ACPI */
-- 
1.9.1



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