ALSA: hda - Fix multi-io channel mode management
The multi-io channels can vary not only from 1 to 6 but also may vary
from 6 to 8 or such. At the same time, there are more speaker pins
available than the primary output pins. So, we need three variables
to check: the minimum channel counts for primary outputs, the current
channel counts for primary outputs, and the minimum channel counts for
all outputs.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_generic.h b/sound/pci/hda/hda_generic.h
index 00a1eab..b65769c 100644
--- a/sound/pci/hda/hda_generic.h
+++ b/sound/pci/hda/hda_generic.h
@@ -117,8 +117,20 @@
unsigned int cur_mux[3];
/* channel model */
- int const_channel_count; /* min. channel count (for speakers) */
- int ext_channel_count; /* current channel count for multi-io */
+ /* min_channel_count contains the minimum channel count for primary
+ * outputs. When multi_ios is set, the channels can be configured
+ * between min_channel_count and (min_channel_count + multi_ios * 2).
+ *
+ * ext_channel_count contains the current channel count of the primary
+ * out. This varies in the range above.
+ *
+ * Meanwhile, const_channel_count is the channel count for all outputs
+ * including headphone and speakers. It's a constant value, and the
+ * PCM is set up as max(ext_channel_count, const_channel_count).
+ */
+ int min_channel_count; /* min. channel count for primary out */
+ int ext_channel_count; /* current channel count for primary */
+ int const_channel_count; /* channel count for all */
/* PCM information */
struct hda_pcm pcm_rec[3]; /* used in build_pcms() */