On Thu, 01 Sep 2022 12:06:25 +0200, chihhao chen wrote:
Hi Takashi,
I tested the patch and USB audio function works well. (Start and stop playback more than 20 times with Samsung USB C Earphone)
Great, thanks for quick testing!
Takashi
Thanks
On Thu, 2022-09-01 at 10:28 +0200, Takashi Iwai wrote:
On Thu, 01 Sep 2022 09:51:37 +0200, Takashi Iwai wrote:
On Thu, 01 Sep 2022 07:50:40 +0200, chihhao chen wrote:
Hi Takashi,
The patch fixes this problem. I tried it with "Product: Samsung USB C Earphone" and missing sound problem cannot be reproduced.
OK, it's a good news. I'm going to add more information to the patch description about the regression and submit the patch.
Could you check whether the below cleanup patch on top of the previous one doesn't break things? I lightly tested on my devices and don't believe it would change the actual behavior, but just to be sure.
Takashi
-- 8< -- From: Takashi Iwai tiwai@suse.de Subject: [PATCH] ALSA: usb-audio: Clean up endpoint setups at PCM prepare
This patch cleans up the superfluous checks and calls for setting up the endpoints at PCM prepare callback:
Drop stop_endpoints() and sync_pending_stops() calls; the stream is guaranteed to have been already stopped and synced at each PCM prepare call by ALSA PCM core
Call snd_usb_endpoint_prepare() unconditionally; the check for endpoint->need_setup is done in snd_pcm_hw_endpoint_prepare() itself
Apply snd_usb_set_format_quirk() only when the endpoint is actually set up (i.e. the return code from snd_usb_endpoint_prepare() > 0)
Move a few lines back into snd_usb_pcm_prepare(); it's even easier to follow than a small useless function
Signed-off-by: Takashi Iwai tiwai@suse.de
sound/usb/pcm.c | 40 ++++++++++------------------------------ 1 file changed, 10 insertions(+), 30 deletions(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index b604f7e95e82..4ed53a3dc922 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -433,35 +433,6 @@ static void close_endpoints(struct snd_usb_audio *chip, } }
-static int configure_endpoints(struct snd_usb_audio *chip,
struct snd_usb_substream *subs)-{
- int err;
- if (subs->data_endpoint->need_setup) {
/* stop any running stream beforehand */if (stop_endpoints(subs, false))sync_pending_stops(subs);if (subs->sync_endpoint) {err = snd_usb_endpoint_prepare(chip, subs-sync_endpoint);
if (err < 0)return err;}err = snd_usb_endpoint_prepare(chip, subs-data_endpoint);
if (err < 0)return err;snd_usb_set_format_quirk(subs, subs->cur_audiofmt);- } else {
if (subs->sync_endpoint) {err = snd_usb_endpoint_prepare(chip, subs-sync_endpoint);
if (err < 0)return err;}- }
- return 0;
-}
/*
- hw_params callback
@@ -640,9 +611,18 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) goto unlock; }
- ret = configure_endpoints(chip, subs);
- if (subs->sync_endpoint) {
ret = snd_usb_endpoint_prepare(chip, subs-sync_endpoint);
if (ret < 0)goto unlock;}
ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint); if (ret < 0) goto unlock;
else if (ret > 0)
snd_usb_set_format_quirk(subs, subs->cur_audiofmt);ret = 0;
/* reset the pointer */ subs->buffer_bytes = frames_to_bytes(runtime, runtime-
buffer_size);