linux-kernel - [PATCH 5.18 294/339] ALSA: usb-audio: Set up (implicit) sync for Saffire 6

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Message-Id: <20220613094935.549912505@linuxfoundation.org>
Date:   Mon, 13 Jun 2022 12:11:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        André Kapelrud <a.kapelrud@...il.com>
Subject: [PATCH 5.18 294/339] ALSA: usb-audio: Set up (implicit) sync for Saffire 6

From: Takashi Iwai <tiwai@...e.de>

commit e0469d6581aecb0e34e2ec64f39f88e6985cc52f upstream.

Focusrite Saffire 6 has fixed audioformat quirks with multiple
endpoints assigned to a single altsetting.  Unfortunately the generic
parser couldn't detect the sync endpoint correctly as the implicit
sync due to the missing EP attribute bits.  In the former kernels, it
used to work somehow casually, but it's been broken for a while after
the large code change in 5.11.

This patch cures the regression by the following:
- Allow the static quirk table to provide the sync EP information;
  we just need to fill the fields and let the generic parser skipping
  parsing if sync_ep is already set.
- Add the sync endpoint information to the entry for Saffire 6.

Fixes: 7b0efea4baf0 ("ALSA: usb-audio: Add missing ep_idx in fixed EP quirks")
Reported-and-tested-by: André Kapelrud <a.kapelrud@...il.com>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20220606160910.6926-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/usb/pcm.c          |    3 +++
 sound/usb/quirks-table.h |    7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -291,6 +291,9 @@ int snd_usb_audioformat_set_sync_ep(stru
 	bool is_playback;
 	int err;
 
+	if (fmt->sync_ep)
+		return 0; /* already set up */
+
 	alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
 	if (!alts)
 		return 0;
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -2658,7 +2658,12 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 					.nr_rates = 2,
 					.rate_table = (unsigned int[]) {
 						44100, 48000
-					}
+					},
+					.sync_ep = 0x82,
+					.sync_iface = 0,
+					.sync_altsetting = 1,
+					.sync_ep_idx = 1,
+					.implicit_fb = 1,
 				}
 			},
 			{