[PATCH 4.19 044/115] ALSA: usb-audio: set the interface format after resume on Dell WD19

Greg Kroah-Hartman
2020-01-07T21:05:49Z

From: Hui Wang <hui.wang@canonical.com>

commit 92adc96f8eecd9522a907c197cc3d62e405539fe upstream.

Recently we found the headset-mic on the Dell Dock WD19 doesn't work
anymore after s3 (s2i or deep), this problem could be workarounded by
closing (pcm_close) the app and then reopening (pcm_open) the app, so
this bug is not easy to be detected by users.

When problem happens, retire_capture_urb() could still be called
periodically, but the size of captured data is always 0, it could be
a firmware bug on the dock. Anyway I found after resuming, the
snd_usb_pcm_prepare() will be called, and if we forcibly run
set_format() to set the interface and its endpoint, the capture
size will be normal again. This problem and workaound also apply to
playback.

To fix it in the kernel, add a quirk to let set_format() run
forcibly once after resume.

Signed-off-by: Hui Wang <hui.wang@canonical.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191218132650.6303-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/usb/card.h | 1 +
sound/usb/pcm.c | 21 +++++++++++++++++++--
sound/usb/quirks-table.h | 3 ++-
sound/usb/quirks.c | 11 +++++++++++
sound/usb/usbaudio.h | 3 ++-
5 files changed, 35 insertions(+), 4 deletions(-)

--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -142,6 +142,7 @@ struct snd_usb_substream {
struct snd_usb_endpoint *sync_endpoint;
unsigned long flags;
bool need_setup_ep; /* (re)configure EP at prepare? */
+ bool need_setup_fmt; /* (re)configure fmt after resume? */
unsigned int speed; /* USB_SPEED_XXX */

u64 formats; /* format bitmasks (all or'ed) */
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -517,11 +517,11 @@ static int set_format(struct snd_usb_sub
return -EINVAL;
altsd = get_iface_desc(alts);

- if (fmt == subs->cur_audiofmt)
+ if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
return 0;

/* close the old interface */
- if (subs->interface >= 0 && subs->interface != fmt->iface) {
+ if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
if (!subs->stream->chip->keep_iface) {
err = usb_set_interface(subs->dev, subs->interface, 0);
if (err < 0) {
@@ -535,6 +535,9 @@ static int set_format(struct snd_usb_sub
subs->altset_idx = 0;
}

+ if (subs->need_setup_fmt)
+ subs->need_setup_fmt = false;
+
/* set interface */
if (iface->cur_altsetting != alts) {
err = snd_usb_select_mode_quirk(subs, fmt);
@@ -1722,6 +1725,13 @@ static int snd_usb_substream_playback_tr
subs->data_endpoint->retire_data_urb = retire_playback_urb;
subs->running = 0;
return 0;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (subs->stream->chip->setup_fmt_after_resume_quirk) {
+ stop_endpoints(subs, true);
+ subs->need_setup_fmt = true;
+ return 0;
+ }
+ break;
}

return -EINVAL;
@@ -1754,6 +1764,13 @@ static int snd_usb_substream_capture_tri
subs->data_endpoint->retire_data_urb = retire_capture_urb;
subs->running = 1;
return 0;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (subs->stream->chip->setup_fmt_after_resume_quirk) {
+ stop_endpoints(subs, true);
+ subs->need_setup_fmt = true;
+ return 0;
+ }
+ break;
}

return -EINVAL;
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3400,7 +3400,8 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge
.vendor_name = "Dell",
.product_name = "WD19 Dock",
.profile_name = "Dell-WD15-Dock",
- .ifnum = QUIRK_NO_INTERFACE
+ .ifnum = QUIRK_ANY_INTERFACE,
+ .type = QUIRK_SETUP_FMT_AFTER_RESUME
}
},

--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -519,6 +519,16 @@ static int create_standard_mixer_quirk(s
return snd_usb_create_mixer(chip, quirk->ifnum, 0);
}

+
+static int setup_fmt_after_resume_quirk(struct snd_usb_audio *chip,
+ struct usb_interface *iface,
+ struct usb_driver *driver,
+ const struct snd_usb_audio_quirk *quirk)
+{
+ chip->setup_fmt_after_resume_quirk = 1;
+ return 1; /* Continue with creating streams and mixer */
+}
+
/*
* audio-interface quirks
*
@@ -557,6 +567,7 @@ int snd_usb_create_quirk(struct snd_usb_
[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
+ [QUIRK_SETUP_FMT_AFTER_RESUME] = setup_fmt_after_resume_quirk,
};

if (quirk->type < QUIRK_TYPE_COUNT) {
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -44,7 +44,7 @@ struct snd_usb_audio {
wait_queue_head_t shutdown_wait;
unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
unsigned int tx_length_quirk:1; /* Put length specifier in transfers */
-
+ unsigned int setup_fmt_after_resume_quirk:1; /* setup the format to interface after resume */
int num_interfaces;
int num_suspended_intf;
int sample_rate_read_error;
@@ -107,6 +107,7 @@ enum quirk_type {
QUIRK_AUDIO_EDIROL_UAXX,
QUIRK_AUDIO_ALIGN_TRANSFER,
QUIRK_AUDIO_STANDARD_MIXER,
+ QUIRK_SETUP_FMT_AFTER_RESUME,

QUIRK_TYPE_COUNT
};