From 7be34f6feedd60e418de1c2c48e661d70416635f Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 27 Nov 2024 08:00:58 +0100
Subject: [PATCH] ALSA: ump: Fix evaluation of MIDI 1.0 FB info
The m1.0 field of UMP Function Block info specifies whether the given
FB is a MIDI 1.0 port or not. When implementing the UMP support on
Linux, I somehow interpreted as if it were bit flags, but the field is
actually an enumeration from 0 to 2, where 2 means MIDI 1.0 *and* low
speed.
This patch corrects the interpretation and sets the right bit flags
depending on the m1.0 field of FB Info. This effectively fixes the
missing detection of MIDI 1.0 FB when m1.0 is 2.
Fixes: 37e0e14128e0 ("ALSA: ump: Support UMP Endpoint and Function Block parsing")
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20241127070059.8099-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/ump.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/core/ump.c b/sound/core/ump.c
index 5d4dd207e5ab2..6d0aac6c763fe 100644
--- a/sound/core/ump.c
+++ b/sound/core/ump.c
@@ -788,7 +788,10 @@ static void fill_fb_info(struct snd_ump_endpoint *ump,
info->ui_hint = buf->fb_info.ui_hint;
info->first_group = buf->fb_info.first_group;
info->num_groups = buf->fb_info.num_groups;
- info->flags = buf->fb_info.midi_10;
+ if (buf->fb_info.midi_10 < 2)
+ info->flags = buf->fb_info.midi_10;
+ else
+ info->flags = SNDRV_UMP_BLOCK_IS_MIDI1 | SNDRV_UMP_BLOCK_IS_LOWSPEED;
info->active = buf->fb_info.active;
info->midi_ci_version = buf->fb_info.midi_ci_version;
info->sysex8_streams = buf->fb_info.sysex8_streams;
--
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