[ALSA] ice1724 - Add comments for naming of PCM streams
Added some comments regarding naming of PCM streams on vt172x chip.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index 0666cbc..6a29bcf 100644
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -2345,6 +2345,14 @@
}
c = &no_matched;
__found:
+ /*
+ * VT1724 has separate DMAs for the analog and the SPDIF streams while
+ * ICE1712 has only one for both (mixed up).
+ *
+ * Confusingly the analog PCM is named "professional" here because it
+ * was called so in ice1712 driver, and vt1724 driver is derived from
+ * ice1712 driver.
+ */
if ((err = snd_vt1724_pcm_profi(ice, pcm_dev++)) < 0) {
snd_card_free(card);