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ata: libahci: Adjust behavior when StorageD3Enable _DSD is set

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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>
This commit is contained in:
Mario Limonciello 2021-11-12 14:15:39 -06:00 committed by Damien Le Moal
parent 1527f69204
commit 7c5f641a59
1 changed files with 15 additions and 0 deletions
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15
drivers/ata/libahci.c
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@ -2323,6 +2323,18 @@ int ahci_port_resume(struct ata_port *ap)
EXPORT_SYMBOL_GPL(ahci_port_resume);
#ifdef CONFIG_PM
static void ahci_handle_s2idle(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 devslp;
if (pm_suspend_via_firmware())
return;
devslp = readl(port_mmio + PORT_DEVSLP);
if ((devslp & PORT_DEVSLP_ADSE))
ata_msleep(ap, devslp_idle_timeout);
}
static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
{
const char *emsg = NULL;
@ -2336,6 +2348,9 @@ static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
ata_port_freeze(ap);
}
if (acpi_storage_d3(ap->host->dev))
ahci_handle_s2idle(ap);
ahci_rpm_put_port(ap);
return rc;
}