From 1e494dc5f3140005ff1f17bc06c0c16d6d50d580 Mon Sep 17 00:00:00 2001

From: Mark Salter <msalter@redhat.com>

Date: Thu, 19 Apr 2018 23:29:47 -0400

Subject: [PATCH] ACPI / scan: Fix regression related to X-Gene UARTs

Commit e361d1f85855 ("ACPI / scan: Fix enumeration for special UART

devices") caused a regression with some X-Gene based platforms (Mustang

and M400) with invalid DSDT. The DSDT makes it appear that the UART

device is also a slave device attached to itself. With the above commit

the UART won't be enumerated by ACPI scan (slave serial devices shouldn't

be). So check for X-Gene UART device and skip slace device check on it.

Signed-off-by: Mark Salter <msalter@redhat.com>

---

 drivers/acpi/scan.c | 8 ++++++++

 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c

index e1b6231cfa1c..542dafac4306 100644

--- a/drivers/acpi/scan.c

+++ b/drivers/acpi/scan.c

@@ -1614,6 +1614,14 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)

 	if (!acpi_match_device_ids(device, ignore_serial_bus_ids))

 		return false;

+	/*

+	 * Firmware on some arm64 X-Gene platforms will make the UART

+	 * device appear as both a UART and a slave of that UART. Just

+	 * bail out here for X-Gene UARTs.

+	 */

+	if (!strcmp(acpi_device_hid(device), "APMC0D08"))

+		return false;

+

 	INIT_LIST_HEAD(&resource_list);

 	acpi_dev_get_resources(device, &resource_list,

 			       acpi_check_serial_bus_slave,

-- 

2.17.1