[alsa-devel] [PATCH 1/3] ALSA: hda: add hdac_adsp_enable module flag

[Vinod Koul]

Some Intel HDA controllers sport a DSP. These systems can also be enabled
with ASoC HDA driver as well. So add a flag in hda-core to enable/disable
aDSP This flag for now is false, and should be true once the ASoC based
systems mature.  The integrators/OS vendors can configure this flag based on
system preference.

Signed-off-by: Vinod Koul <vinod.koul at intel.com>
---
 include/sound/hdaudio.h  | 11 +++++++++++
 sound/hda/hda_bus_type.c |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index b97c59eab7ab..015bec1079f9 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -12,6 +12,17 @@
 #include <sound/memalloc.h>
 #include <sound/hda_verbs.h>
 
+/*
+ * hdac_adsp_enable: exported HD-A aDSP enable configuration.
+ *
+ * Some Intel HDA controllers sport a DSP, for these platform we can bypass
+ * aDSP and use as regular HDA controller or enable aDSP and use aDSP
+ * along with I2S codecs etc.
+ * hdac_adsp_enable would enable the aDSP based HDA controller if the
+ * platform supports it
+ */
+extern bool hdac_adsp_enable;
+
 /* codec node id */
 typedef u16 hda_nid_t;
 
diff --git a/sound/hda/hda_bus_type.c b/sound/hda/hda_bus_type.c
index 519914a12e8a..80e0570ffbf4 100644
--- a/sound/hda/hda_bus_type.c
+++ b/sound/hda/hda_bus_type.c
@@ -10,6 +10,10 @@
 MODULE_DESCRIPTION("HD-audio bus");
 MODULE_LICENSE("GPL");
 
+bool hdac_adsp_enable = false;
+module_param(hdac_adsp_enable, bool, 0444);
+MODULE_PARM_DESC(hdac_adsp_enable, "Enable aDSP on Intel HDA based systems");
+
 static int hda_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct hdac_device *hdev = dev_to_hdac_dev(dev);
-- 
1.9.1