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[2/3] ALSA: ump: Add no_process_stream flag

Message ID 20230621110241.4751-3-tiwai@suse.de (mailing list archive)
State Accepted
Commit eacd9c7f1d3ab8381a99b98b36652b5cf6ae8387
Headers show
Series ALSA: ump: Preliminary changes for gadget driver | expand

Commit Message

Takashi Iwai June 21, 2023, 11:02 a.m. UTC 
This is another preliminary patch for USB MIDI 2.0 gadget driver.
Add a new flag, no_process_stream, to snd_ump for suppressing the UMP
Stream message handling in UMP core.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/sound/ump.h | 1 +
 sound/core/ump.c    | 4 ++++
 2 files changed, 5 insertions(+)
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Patch

diff --git a/include/sound/ump.h b/include/sound/ump.h
index 3c7e67475676..2f6a9944c6ef 100644
--- a/include/sound/ump.h
+++ b/include/sound/ump.h
@@ -28,6 +28,7 @@  struct snd_ump_endpoint {
 	u32 stream_wait_for;	/* expected stream message status */
 	bool stream_finished;	/* set when message has been processed */
 	bool parsed;		/* UMP / FB parse finished? */
+	bool no_process_stream;	/* suppress UMP stream messages handling */
 	wait_queue_head_t stream_wait;
 	struct snd_rawmidi_file stream_rfile;
 
diff --git a/sound/core/ump.c b/sound/core/ump.c
index 4150b9c0b35b..5e73c9cf5919 100644
--- a/sound/core/ump.c
+++ b/sound/core/ump.c
@@ -854,6 +854,10 @@  static void ump_handle_stream_msg(struct snd_ump_endpoint *ump,
 	unsigned int status;
 	int ret;
 
+	/* UMP stream message suppressed (for gadget UMP)? */
+	if (ump->no_process_stream)
+		return;
+
 	BUILD_BUG_ON(sizeof(*msg) != 16);
 	ump_dbg(ump, "Stream msg: %08x %08x %08x %08x\n",
 		buf[0], buf[1], buf[2], buf[3]);