ALSA: oxfw: fix transmission method for Loud models based on OXFW971

Loud Technologies Mackie Onyx 1640i (former model) is identified as
the model which uses OXFW971. The analysis of packet dump shows that
it transfers events in blocking method of IEC 61883-6, however the
default behaviour of ALSA oxfw driver is for non-blocking method.

This commit adds code to detect it assuming that all of loud models
based on OXFW971 have such quirk. It brings no functional change
except for alignment rule of PCM buffer.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210913021042.10085-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/oxfw/oxfw.c b/sound/firewire/oxfw/oxfw.c
index cb5b5e3a481b9ba3149fdbee7fb896c4bf7f7d46..daf731364695b1531c29258e8775fc54dbed78b6 100644 (file)
--- a/sound/firewire/oxfw/oxfw.c
+++ b/sound/firewire/oxfw/oxfw.c
@@ -184,13 +184,16 @@ static int detect_quirks(struct snd_oxfw *oxfw, const struct ieee1394_device_id
                        model = val;
        }
 
-       /*
-        * Mackie Onyx Satellite with base station has a quirk to report a wrong
-        * value in 'dbs' field of CIP header against its format information.
-        */
-       if (vendor == VENDOR_LOUD && model == MODEL_SATELLITE)
+       if (vendor == VENDOR_LOUD) {
+               // Mackie Onyx Satellite with base station has a quirk to report a wrong
+               // value in 'dbs' field of CIP header against its format information.
                oxfw->quirks |= SND_OXFW_QUIRK_WRONG_DBS;
 
+               // OXFW971-based models may transfer events by blocking method.
+               if (!(oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD))
+                       oxfw->quirks |= SND_OXFW_QUIRK_BLOCKING_TRANSMISSION;
+       }
+
        return 0;
 }