ata: libahci: Adjust behavior when StorageD3Enable _DSD is set
authorMario Limonciello <mario.limonciello@amd.com>
Fri, 12 Nov 2021 20:15:39 +0000 (14:15 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 8 Dec 2021 08:04:40 +0000 (09:04 +0100)
commitb56c75d4d3c3c614fa45a1d4199d0d196c80efba
tree771a48d1eb66835426706cdbdc4273327a58563f
parentab8efdbda76ca5ac01d8e37929f31aa186549c63
ata: libahci: Adjust behavior when StorageD3Enable _DSD is set

[ Upstream commit 7c5f641a5914ce0303b06bcfcd7674ee64aeebe9 ]

The StorageD3Enable _DSD is used for the vendor to indicate that the disk
should be opted into or out of a different behavior based upon the platform
design.

For AMD's Renoir and Green Sardine platforms it's important that any
attached SATA storage has transitioned into DevSlp when s2idle is used.

If the disk is left in active/partial/slumber, then the system is not able
to resume properly.

When the StorageD3Enable _DSD is detected, check the system is using s2idle
and DevSlp is enabled and if so explicitly wait long enough for the disk to
enter DevSlp.

Cc: Nehal-bakulchandra Shah <Nehal-bakulchandra.Shah@amd.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214091
Link: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/ata/libahci.c