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-rw-r--r--sound/usb/endpoint.c76
-rw-r--r--sound/usb/endpoint.h6
-rw-r--r--sound/usb/pcm.c51
3 files changed, 70 insertions, 63 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index eb71df9da831..0c94ebc98e90 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -40,6 +40,7 @@ struct snd_usb_clock_ref {
unsigned char clock;
atomic_t locked;
int rate;
+ bool need_setup;
struct list_head list;
};
@@ -758,7 +759,8 @@ bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
* The endpoint needs to be closed via snd_usb_endpoint_close() later.
*
* Note that this function doesn't configure the endpoint. The substream
- * needs to set it up later via snd_usb_endpoint_configure().
+ * needs to set it up later via snd_usb_endpoint_set_params() and
+ * snd_usb_endpoint_prepare().
*/
struct snd_usb_endpoint *
snd_usb_endpoint_open(struct snd_usb_audio *chip,
@@ -1289,15 +1291,39 @@ out_of_memory:
return -ENOMEM;
}
+/* update the rate of the referred clock; return the actual rate */
+static int update_clock_ref_rate(struct snd_usb_audio *chip,
+ struct snd_usb_endpoint *ep)
+{
+ struct snd_usb_clock_ref *clock = ep->clock_ref;
+ int rate = ep->cur_rate;
+
+ if (!clock || clock->rate == rate)
+ return rate;
+ if (clock->rate) {
+ if (atomic_read(&clock->locked))
+ return clock->rate;
+ if (clock->rate != rate) {
+ usb_audio_err(chip, "Mismatched sample rate %d vs %d for EP 0x%x\n",
+ clock->rate, rate, ep->ep_num);
+ return clock->rate;
+ }
+ }
+ clock->rate = rate;
+ clock->need_setup = true;
+ return rate;
+}
+
/*
* snd_usb_endpoint_set_params: configure an snd_usb_endpoint
*
+ * It's called either from hw_params callback.
* Determine the number of URBs to be used on this endpoint.
* An endpoint must be configured before it can be started.
* An endpoint that is already running can not be reconfigured.
*/
-static int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
- struct snd_usb_endpoint *ep)
+int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
+ struct snd_usb_endpoint *ep)
{
const struct audioformat *fmt = ep->cur_audiofmt;
int err;
@@ -1349,49 +1375,46 @@ static int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
ep->maxframesize = ep->maxpacksize / ep->cur_frame_bytes;
ep->curframesize = ep->curpacksize / ep->cur_frame_bytes;
- return 0;
+ return update_clock_ref_rate(chip, ep);
}
static int init_sample_rate(struct snd_usb_audio *chip,
struct snd_usb_endpoint *ep)
{
struct snd_usb_clock_ref *clock = ep->clock_ref;
- int err;
+ int rate, err;
- if (clock) {
- if (atomic_read(&clock->locked))
- return 0;
- if (clock->rate == ep->cur_rate)
- return 0;
- if (clock->rate && clock->rate != ep->cur_rate) {
- usb_audio_dbg(chip, "Mismatched sample rate %d vs %d for EP 0x%x\n",
- clock->rate, ep->cur_rate, ep->ep_num);
- return -EINVAL;
- }
- }
+ rate = update_clock_ref_rate(chip, ep);
+ if (rate < 0)
+ return rate;
+ if (clock && !clock->need_setup)
+ return 0;
- err = snd_usb_init_sample_rate(chip, ep->cur_audiofmt, ep->cur_rate);
- if (err < 0)
+ err = snd_usb_init_sample_rate(chip, ep->cur_audiofmt, rate);
+ if (err < 0) {
+ if (clock)
+ clock->rate = 0; /* reset rate */
return err;
+ }
if (clock)
- clock->rate = ep->cur_rate;
+ clock->need_setup = false;
return 0;
}
/*
- * snd_usb_endpoint_configure: Configure the endpoint
+ * snd_usb_endpoint_prepare: Prepare the endpoint
*
* This function sets up the EP to be fully usable state.
- * It's called either from hw_params or prepare callback.
+ * It's called either from prepare callback.
* The function checks need_setup flag, and performs nothing unless needed,
* so it's safe to call this multiple times.
*
* This returns zero if unchanged, 1 if the configuration has changed,
* or a negative error code.
*/
-int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
- struct snd_usb_endpoint *ep)
+int snd_usb_endpoint_prepare(struct snd_usb_audio *chip,
+ struct snd_usb_endpoint *ep)
{
bool iface_first;
int err = 0;
@@ -1412,9 +1435,6 @@ int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
if (err < 0)
goto unlock;
}
- err = snd_usb_endpoint_set_params(chip, ep);
- if (err < 0)
- goto unlock;
goto done;
}
@@ -1442,10 +1462,6 @@ int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
if (err < 0)
goto unlock;
- err = snd_usb_endpoint_set_params(chip, ep);
- if (err < 0)
- goto unlock;
-
err = snd_usb_select_mode_quirk(chip, ep->cur_audiofmt);
if (err < 0)
goto unlock;
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index 6a9af04cf175..e67ea28faa54 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -17,8 +17,10 @@ snd_usb_endpoint_open(struct snd_usb_audio *chip,
bool is_sync_ep);
void snd_usb_endpoint_close(struct snd_usb_audio *chip,
struct snd_usb_endpoint *ep);
-int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
- struct snd_usb_endpoint *ep);
+int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
+ struct snd_usb_endpoint *ep);
+int snd_usb_endpoint_prepare(struct snd_usb_audio *chip,
+ struct snd_usb_endpoint *ep);
int snd_usb_endpoint_get_clock_rate(struct snd_usb_audio *chip, int clock);
bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index d45d1d7e6664..e721fc12acde 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_configure(chip, subs->sync_endpoint);
- if (err < 0)
- return err;
- }
- err = snd_usb_endpoint_configure(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_configure(chip, subs->sync_endpoint);
- if (err < 0)
- return err;
- }
- }
-
- return 0;
-}
-
/*
* hw_params callback
*
@@ -551,7 +522,16 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
subs->cur_audiofmt = fmt;
mutex_unlock(&chip->mutex);
- ret = configure_endpoints(chip, subs);
+ if (!subs->data_endpoint->need_setup)
+ goto unlock;
+
+ if (subs->sync_endpoint) {
+ ret = snd_usb_endpoint_set_params(chip, subs->sync_endpoint);
+ if (ret < 0)
+ goto unlock;
+ }
+
+ ret = snd_usb_endpoint_set_params(chip, subs->data_endpoint);
unlock:
if (ret < 0)
@@ -634,9 +614,18 @@ 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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-09-14 18:47:16 +0300