From 59ea586f54f27fde1202214f1525713356a44918 Mon Sep 17 00:00:00 2001
From: Mark Hills <mark@xwax.org>
Date: Sun, 17 Mar 2013 11:07:54 +0000
Subject: ALSA: usb-audio: Trust fields given in the quirk

The maxpacksize field is given in some quirks, but it gets ignored (in
favour of wMaxPacketSize from the first endpoint.) This patch favours
the one in the quirk.

Digidesign Mbox and Mbox 2 are the only affected quirks and the devices
are assumed to be working without this patch. So for safety against the
values in the quirk being incorrect, remove them.

The datainterval is also ignored but there are not currently any quirks
which choose to override this.

Cc: Damien Zammit <damien@zamaudio.com>
Cc: Chris J Arges <christopherarges@gmail.com>
Signed-off-by: Mark Hills <mark@xwax.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index a620c23..86e4b8c 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3036,7 +3036,6 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
 					.endpoint = 0x02,
 					.ep_attr = 0x01,
-					.maxpacksize = 0x130,
 					.rates = SNDRV_PCM_RATE_44100 |
 						 SNDRV_PCM_RATE_48000,
 					.rate_min = 44100,
@@ -3084,7 +3083,6 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 					.attributes = 0x00,
 					.endpoint = 0x03,
 					.ep_attr = USB_ENDPOINT_SYNC_ASYNC,
-					.maxpacksize = 0x128,
 					.rates = SNDRV_PCM_RATE_48000,
 					.rate_min = 48000,
 					.rate_max = 48000,
@@ -3110,7 +3108,6 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
 					.endpoint = 0x85,
 					.ep_attr = USB_ENDPOINT_SYNC_SYNC,
-					.maxpacksize = 0x128,
 					.rates = SNDRV_PCM_RATE_48000,
 					.rate_min = 48000,
 					.rate_max = 48000,
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 7c4fe5a..a2ac004 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -165,8 +165,10 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 		return -EINVAL;
 	}
 	alts = &iface->altsetting[fp->altset_idx];
-	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
-	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
+	if (fp->datainterval == 0)
+		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
+	if (fp->maxpacksize == 0)
+		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 	usb_set_interface(chip->dev, fp->iface, 0);
 	snd_usb_init_pitch(chip, fp->iface, alts, fp);
 	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
-- 
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