diff options
Diffstat (limited to '0001-aarch64-acpi-scan-Fix-regression-related-to-X-Gene-U.patch')
| -rw-r--r-- | 0001-aarch64-acpi-scan-Fix-regression-related-to-X-Gene-U.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/0001-aarch64-acpi-scan-Fix-regression-related-to-X-Gene-U.patch b/0001-aarch64-acpi-scan-Fix-regression-related-to-X-Gene-U.patch new file mode 100644 index 000000000..86cbf5dad --- /dev/null +++ b/0001-aarch64-acpi-scan-Fix-regression-related-to-X-Gene-U.patch @@ -0,0 +1,52 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +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; + ++ /* ++ * 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, +-- +2.26.2 + |