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ata: Disable AHCI ALPM feature for Ampere Computing eMAG SATA

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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 Trpathi <stripathi@amperecomputing.com>
Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Suman Tripathi 2018-09-07 08:32:17 -06:00 committed by Jens Axboe
parent caf8975b97
commit 20bdc376b4
1 changed files with 14 additions and 1 deletions
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15
drivers/ata/ahci_platform.c
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@ -33,6 +33,13 @@ static const struct ata_port_info ahci_port_info = {
.port_ops = &ahci_platform_ops,
};
static const struct ata_port_info ahci_port_info_nolpm = {
.flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_LPM,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
@ -41,6 +48,7 @@ static int ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
const struct ata_port_info *port;
int rc;
hpriv = ahci_platform_get_resources(pdev,
@ -58,7 +66,11 @@ 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;
rc = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
port = acpi_device_get_match_data(dev);
if (!port)
port = &ahci_port_info;
rc = ahci_platform_init_host(pdev, hpriv, port,
&ahci_platform_sht);
if (rc)
goto disable_resources;
@ -85,6 +97,7 @@ static const struct of_device_id ahci_of_match[] = {
MODULE_DEVICE_TABLE(of, ahci_of_match);
static const struct acpi_device_id ahci_acpi_match[] = {
{ "APMC0D33", (unsigned long)&ahci_port_info_nolpm },
{ ACPI_DEVICE_CLASS(PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff) },
{},
};