2020-04-27 02:15:20 +00:00
|
|
|
From 176c6c76841d9600f1309742dd7af40a69f6f91b Mon Sep 17 00:00:00 2001
|
2020-04-23 20:47:21 +00:00
|
|
|
From: Mark Salter <msalter@redhat.com>
|
|
|
|
|
Date: Thu, 10 May 2018 17:38:44 -0400
|
|
|
|
|
Subject: [PATCH] aarch64: acpi scan: Fix regression related to X-Gene UARTs
|
|
|
|
|
|
|
|
|
|
Message-id: <20180510173844.29580-4-msalter@redhat.com>
|
|
|
|
|
Patchwork-id: 214381
|
|
|
|
|
O-Subject: [RHEL-8 BZ1519554 3/3] aarch64: acpi scan: Fix regression related to X-Gene UARTs
|
|
|
|
|
Bugzilla: 1519554
|
|
|
|
|
RH-Acked-by: Al Stone <astone@redhat.com>
|
|
|
|
|
RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
|
|
|
|
|
|
|
|
|
|
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1519554
|
|
|
|
|
Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=16144520
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
Upstream Status: RHEL only
|
|
|
|
|
Signed-off-by: Mark Salter <msalter@redhat.com>
|
|
|
|
|
Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
|
|
|
|
|
---
|
|
|
|
|
drivers/acpi/scan.c | 9 +++++++++
|
|
|
|
|
1 file changed, 9 insertions(+)
|
|
|
|
|
|
|
|
|
|
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
|
|
|
|
|
index 6d3448895382..221255007dc8 100644
|
|
|
|
|
--- a/drivers/acpi/scan.c
|
|
|
|
|
+++ b/drivers/acpi/scan.c
|
|
|
|
|
@@ -1563,6 +1563,15 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
|
|
|
|
|
if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
|
|
|
|
|
return false;
|
2020-04-27 02:15:20 +00:00
|
|
|
|
2020-04-23 20:47:21 +00:00
|
|
|
+ /*
|
|
|
|
|
+ * 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 (IS_ENABLED(CONFIG_ARM64) &&
|
|
|
|
|
+ !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,
|
|
|
|
|
--
|
2020-04-27 02:15:20 +00:00
|
|
|
2.26.2
|
2020-04-23 20:47:21 +00:00
|
|
|
|
