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From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: clemens@ladisch.de, tiwai@suse.de
Cc: alsa-devel@alsa-project.org
Subject: [alsa-devel] [PATCH 1/3] ALSA: bebob: expand sleep just after breaking connections for protocol version 1
Date: Fri,  1 Nov 2019 22:13:21 +0900
Message-ID: <20191101131323.17300-2-o-takashi@sakamocchi.jp> (raw)
In-Reply-To: <20191101131323.17300-1-o-takashi@sakamocchi.jp>

As long as I investigated, some devices with BeBoB protocol version 1
can be freezed during several hundreds milliseconds after breaking
connections. When accessing during the freezed time, any transaction
is corrupted. In the worst case, the device is going to reboot.

I can see this issue in:
 * Roland FA-66
 * M-Audio FireWire Solo

This commit expands sleep just after breaking connections to avoid
the freezed time as much as possible. I note that the freeze/reboot
behaviour is similar to below models:
 * Focusrite Saffire Pro 10 I/O
 * Focusrite Saffire Pro 26 I/O

The above models certainly reboot after breaking connections.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/bebob/bebob_stream.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index f7f0db5aa811..1b264d0d63eb 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -415,15 +415,16 @@ static int make_both_connections(struct snd_bebob *bebob)
 	return 0;
 }
 
-static void
-break_both_connections(struct snd_bebob *bebob)
+static void break_both_connections(struct snd_bebob *bebob)
 {
 	cmp_connection_break(&bebob->in_conn);
 	cmp_connection_break(&bebob->out_conn);
 
-	/* These models seems to be in transition state for a longer time. */
-	if (bebob->maudio_special_quirk != NULL)
-		msleep(200);
+	// These models seem to be in transition state for a longer time. When
+	// accessing in the state, any transactions is corrupted. In the worst
+	// case, the device is going to reboot.
+	if (bebob->version < 2)
+		msleep(600);
 }
 
 static int
-- 
2.20.1

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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-01 13:13 [alsa-devel] [PATCH 0/3] ALSA: bebob: misc improvements for starting/stopping packet streaming Takashi Sakamoto
2019-11-01 13:13 ` Takashi Sakamoto [this message]
2020-03-26 21:47   ` [alsa-devel] [PATCH 1/3] ALSA: bebob: expand sleep just after breaking connections for protocol version 1 Steve Morris
2020-03-27  8:40     ` Takashi Iwai
2020-03-27 19:13       ` Steve Morris
2019-11-01 13:13 ` [alsa-devel] [PATCH 2/3] ALSA: bebob: expand delay of start for IR context just for version 3 firmware Takashi Sakamoto
2019-11-01 13:13 ` [alsa-devel] [PATCH 3/3] ALSA: bebob: link the order of establishing connections and Syt-match clock mode Takashi Sakamoto
2019-11-02  7:51 ` [alsa-devel] [PATCH 0/3] ALSA: bebob: misc improvements for starting/stopping packet streaming Takashi Iwai

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