Due to hardware errata, Ampere Computing eMAG SATA can't support
AHCI ALPM feature. This patch disables the AHCI ALPM feature for
eMAG SATA.
Signed-off-by: Suman Tripathi <stripathi@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/ahci_platform.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 99f9a89..0d0233e 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -26,7 +26,7 @@
#define DRV_NAME "ahci"
-static const struct ata_port_info ahci_port_info = {
+static struct ata_port_info ahci_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
@@ -41,6 +41,8 @@ static int ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
+ struct acpi_device_info *info;
+ acpi_status status;
int rc;
hpriv = ahci_platform_get_resources(pdev);
@@ -57,6 +59,15 @@ static int ahci_probe(struct platform_device *pdev)
if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
+ status = acpi_get_object_info(ACPI_HANDLE(dev), &info);
+ if (ACPI_SUCCESS(status)) {
+ if (info->valid & ACPI_VALID_HID) {
+ if (!strcmp("APMC0D33", info->hardware_id.string))
+ ahci_port_info.flags |= ATA_FLAG_NO_LPM;
+ }
+ ACPI_FREE(info);
+ }
+
rc = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
&ahci_platform_sht);
if (rc)
--
1.8.3.1
