linux-kernel - [PATCH] ata: Disable AHCI ALPM feature for Ampere Computing eMAG SATA

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Message-Id: <1535228998-9853-1-git-send-email-stripathi@amperecomputing.com>
Date:   Sat, 25 Aug 2018 13:29:58 -0700
From:   Suman Tripathi <stripathi@...erecomputing.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        joe@...ches.com, arnd@...db.de, gregkh@...uxfoundation.org
Cc:     Suman Tripathi <stripathi@...erecomputing.com>,
        Rameshwar Prasad Sahu <rameshwar.sahu@...erecomputing.com>
Subject: [PATCH] ata: Disable AHCI ALPM feature for Ampere Computing eMAG SATA

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@...erecomputing.com>
Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@...erecomputing.com>
---
 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