[PATCH 5.5 091/189] serdev: Fix detection of UART devices on Apple machines.

[Greg Kroah-Hartman]

From: Ronald TschalÃr <ronald@xxxxxxxxxxxxx>

commit 35d4670aaec7206b5ef19c842ca33076bde562e4 upstream.

On Apple devices the _CRS method returns an empty resource template, and
the resource settings are instead provided by the _DSM method. But
commit 33364d63c75d6182fa369cea80315cf1bb0ee38e (serdev: Add ACPI
devices by ResourceSource field) changed the search for serdev devices
to require valid, non-empty resource template, thereby breaking Apple
devices and causing bluetooth devices to not be found.

This expands the check so that if we don't find a valid template, and
we're on an Apple machine, then just check for the device being an
immediate child of the controller and having a "baud" property.

Cc: <stable@xxxxxxxxxxxxxxx> # 5.5
Fixes: 33364d63c75d ("serdev: Add ACPI devices by ResourceSource field")
Signed-off-by: Ronald TschalÃr <ronald@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200211194723.486217-1-ronald@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/tty/serdev/core.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -18,6 +18,7 @@
 #include <linux/sched.h>
 #include <linux/serdev.h>
 #include <linux/slab.h>
+#include <linux/platform_data/x86/apple.h>
 
 static bool is_registered;
 static DEFINE_IDA(ctrl_ida);
@@ -630,6 +631,15 @@ static int acpi_serdev_check_resources(s
 	if (ret)
 		return ret;
 
+	/*
+	 * Apple machines provide an empty resource template, so on those
+	 * machines just look for immediate children with a "baud" property
+	 * (from the _DSM method) instead.
+	 */
+	if (!lookup.controller_handle && x86_apple_machine &&
+	    !acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, NULL))
+		acpi_get_parent(adev->handle, &lookup.controller_handle);
+
 	/* Make sure controller and ResourceSource handle match */
 	if (ACPI_HANDLE(ctrl->dev.parent) != lookup.controller_handle)
 		return -ENODEV;