From: Suman Tripathi stripathi@amperecomputing.com
[ Upstream commit 20bdc376b427cb420836f39ee8f281ea85dbaeef ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/ata/ahci_platform.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c index 46f0bd75eff79..cf1e0e18a7a98 100644 --- a/drivers/ata/ahci_platform.c +++ b/drivers/ata/ahci_platform.c @@ -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) }, {}, };