2020-05-08 14:52:40 +00:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2020-04-23 20:47:21 +00:00
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From: Mark Salter <msalter@redhat.com>
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Date: Thu, 10 May 2018 17:38:44 -0400
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Subject: [PATCH] aarch64: acpi scan: Fix regression related to X-Gene UARTs
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Message-id: <20180510173844.29580-4-msalter@redhat.com>
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Patchwork-id: 214381
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O-Subject: [RHEL-8 BZ1519554 3/3] aarch64: acpi scan: Fix regression related to X-Gene UARTs
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Bugzilla: 1519554
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RH-Acked-by: Al Stone <astone@redhat.com>
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RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1519554
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Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=16144520
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Commit e361d1f85855 ("ACPI / scan: Fix enumeration for special UART
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devices") caused a regression with some X-Gene based platforms (Mustang
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and M400) with invalid DSDT. The DSDT makes it appear that the UART
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device is also a slave device attached to itself. With the above commit
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the UART won't be enumerated by ACPI scan (slave serial devices shouldn't
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be). So check for X-Gene UART device and skip slace device check on it.
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Upstream Status: RHEL only
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Signed-off-by: Mark Salter <msalter@redhat.com>
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Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
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---
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drivers/acpi/scan.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
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2020-08-13 17:44:32 +00:00
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index 2142f1554761..f5fdf6f3650c 100644
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2020-04-23 20:47:21 +00:00
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--- a/drivers/acpi/scan.c
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+++ b/drivers/acpi/scan.c
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2020-08-13 17:44:32 +00:00
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@@ -1574,6 +1574,15 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
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2020-04-23 20:47:21 +00:00
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if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
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return false;
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2020-06-30 14:24:22 +00:00
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2020-04-23 20:47:21 +00:00
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+ /*
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+ * Firmware on some arm64 X-Gene platforms will make the UART
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+ * device appear as both a UART and a slave of that UART. Just
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+ * bail out here for X-Gene UARTs.
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+ */
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+ if (IS_ENABLED(CONFIG_ARM64) &&
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+ !strcmp(acpi_device_hid(device), "APMC0D08"))
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+ return false;
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+
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INIT_LIST_HEAD(&resource_list);
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acpi_dev_get_resources(device, &resource_list,
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acpi_check_serial_bus_slave,
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--
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2020-06-30 14:24:22 +00:00
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2.26.2
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2020-04-23 20:47:21 +00:00
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