Merge tag 'asoc-v5.1' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-next

ASoC: Updates for v5.1

Lots and lots of new drivers so far, a highlight being the MediaTek
BTCVSD which is a driver for a Bluetooth radio chip - the first such
driver we've had upstream.  Hopefully we will soon also see a baseband
with an upstream driver!

 - Support for only powering up channels that are actively being used.
 - Quite a few improvements to simplify the generic card drivers,
   especially the merge of the SCU cards into the main generic drivers.
 - Lots of fixes for probing on Intel systems, trying to rationalize
   things to look more standard from a framework point of view.
 - New drivers for Asahi Kasei Microdevices AK4497, Cirrus Logic CS4341,
   Google ChromeOS embedded controllers, Ingenic JZ4725B, MediaTek
   BTCVSD, MT8183 and MT6358, NXP MICFIL, Rockchip RK3328, Spreadtrum
   DMA controllers, Qualcomm WCD9335, Xilinx S/PDIF and PCM formatters.

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 1b475bc1ae16..665e93ca0b40 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -131,6 +131,23 @@ void acpi_power_resources_list_free(struct list_head *list)
         }
 }
 
+static bool acpi_power_resource_is_dup(union acpi_object *package,
+                                       unsigned int start, unsigned int i)
+{
+        acpi_handle rhandle, dup;
+        unsigned int j;
+
+        /* The caller is expected to check the package element types */
+        rhandle = package->package.elements[i].reference.handle;
+        for (j = start; j < i; j++) {
+                dup = package->package.elements[j].reference.handle;
+                if (dup == rhandle)
+                        return true;
+        }
+
+        return false;
+}
+
 int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
                                  struct list_head *list)
 {
@@ -150,6 +167,11 @@ int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
                         err = -ENODEV;
                         break;
                 }
+
+                /* Some ACPI tables contain duplicate power resource references */
+                if (acpi_power_resource_is_dup(package, start, i))
+                        continue;
+
                 err = acpi_add_power_resource(rhandle);
                 if (err)
                         break;