ALSA: usb-audio: set the interface format after resume on Dell WD19

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>

diff --git a/sound/usb/card.h b/sound/usb/card.h
index 2991b99..395403a 100644 (file)
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -145,6 +145,7 @@ 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) */

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 9c8930b..96298c7 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -510,11 +510,11 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
        if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
                return -EINVAL;
 
-       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) {
@@ -528,6 +528,9 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
                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);
@@ -1728,6 +1731,13 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea
                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;
@@ -1760,6 +1770,13 @@ static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream
                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;

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 70c338f..d187aa6 100644 (file)
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3466,7 +3466,8 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
                .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
        }
 },
 /* MOTU Microbook II */

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 349e1e5..a81c206 100644 (file)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -508,6 +508,16 @@ static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
        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
  *
@@ -546,6 +556,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
                [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) {

diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index ff3cbf6..6fe3ab5 100644 (file)
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -33,7 +33,7 @@ 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;
@@ -98,6 +98,7 @@ enum quirk_type {
        QUIRK_AUDIO_EDIROL_UAXX,
        QUIRK_AUDIO_ALIGN_TRANSFER,
        QUIRK_AUDIO_STANDARD_MIXER,
+       QUIRK_SETUP_FMT_AFTER_RESUME,
 
        QUIRK_TYPE_COUNT
 };