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ALSA: ump: Choose the protocol when protocol caps are changed

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When the protocol capability bits are changed via Endpoint Info update
notification, we should check the validity of the current protocol and
reset it if needed, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20240807092303.1935-2-tiwai@suse.de
This commit is contained in:
Takashi Iwai 2024-08-07 11:22:56 +02:00
parent 901e85677e
commit 08713dcc49
1 changed files with 16 additions and 6 deletions
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22
sound/core/ump.c
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@ -657,6 +657,17 @@ static int ump_append_string(struct snd_ump_endpoint *ump, char *dest,
format == UMP_STREAM_MSG_FORMAT_END);
}
/* Choose the default protocol */
static void choose_default_protocol(struct snd_ump_endpoint *ump)
{
if (ump->info.protocol & SNDRV_UMP_EP_INFO_PROTO_MIDI_MASK)
return;
if (ump->info.protocol_caps & SNDRV_UMP_EP_INFO_PROTO_MIDI2)
ump->info.protocol |= SNDRV_UMP_EP_INFO_PROTO_MIDI2;
else
ump->info.protocol |= SNDRV_UMP_EP_INFO_PROTO_MIDI1;
}
/* handle EP info stream message; update the UMP attributes */
static int ump_handle_ep_info_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
@ -678,6 +689,10 @@ static int ump_handle_ep_info_msg(struct snd_ump_endpoint *ump,
ump_dbg(ump, "EP info: version=%x, num_blocks=%x, proto_caps=%x\n",
ump->info.version, ump->info.num_blocks, ump->info.protocol_caps);
ump->info.protocol &= ump->info.protocol_caps;
choose_default_protocol(ump);
return 1; /* finished */
}
@ -1040,12 +1055,7 @@ int snd_ump_parse_endpoint(struct snd_ump_endpoint *ump)
ump_dbg(ump, "Unable to get UMP EP stream config\n");
/* If no protocol is set by some reason, assume the valid one */
if (!(ump->info.protocol & SNDRV_UMP_EP_INFO_PROTO_MIDI_MASK)) {
if (ump->info.protocol_caps & SNDRV_UMP_EP_INFO_PROTO_MIDI2)
ump->info.protocol |= SNDRV_UMP_EP_INFO_PROTO_MIDI2;
else if (ump->info.protocol_caps & SNDRV_UMP_EP_INFO_PROTO_MIDI1)
ump->info.protocol |= SNDRV_UMP_EP_INFO_PROTO_MIDI1;
}
choose_default_protocol(ump);
/* Query and create blocks from Function Blocks */
for (blk = 0; blk < ump->info.num_blocks; blk++) {