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authorTakashi Iwai <tiwai@suse.de>2020-11-23 09:53:37 +0100
committerTakashi Iwai <tiwai@suse.de>2020-11-23 15:16:13 +0100
commit3d58760f4d0015cc1e7765b580daa007d759d86b (patch)
treebca1eab6c6df12e77c1f98f0f46992fa4528ae30
parent6aa719d15a1903eb3fd0e052ae53f3b024ad4d05 (diff)
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ALSA: usb-audio: Unify the code for the next packet size calculation
There are two places calculating the next packet size for the playback stream in the exactly same way. Provide the single helper for this purpose and use it from both places gracefully. Tested-by: Keith Milner <kamilner@superlative.org> Tested-by: Dylan Robinson <dylan_robinson@motu.com> Link: https://lore.kernel.org/r/20201123085347.19667-32-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/endpoint.c40
-rw-r--r--sound/usb/endpoint.h4
-rw-r--r--sound/usb/pcm.c8
3 files changed, 27 insertions, 25 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 35c84c2264e1..5d618724bd75 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -121,13 +121,13 @@ int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep)
}
/*
- * For streaming based on information derived from sync endpoints,
- * prepare_outbound_urb_sizes() will call slave_next_packet_size() to
- * determine the number of samples to be sent in the next packet.
+ * Return the number of samples to be sent in the next packet
+ * for streaming based on information derived from sync endpoints
*
- * For implicit feedback, slave_next_packet_size() is unused.
+ * This won't be used for implicit feedback which takes the packet size
+ * returned from the sync source
*/
-int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep)
+static int slave_next_packet_size(struct snd_usb_endpoint *ep)
{
unsigned long flags;
int ret;
@@ -145,11 +145,10 @@ int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep)
}
/*
- * For adaptive and synchronous endpoints, prepare_outbound_urb_sizes()
- * will call next_packet_size() to determine the number of samples to be
- * sent in the next packet.
+ * Return the number of samples to be sent in the next packet
+ * for adaptive and synchronous endpoints
*/
-int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
+static int next_packet_size(struct snd_usb_endpoint *ep)
{
int ret;
@@ -167,6 +166,21 @@ int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
return ret;
}
+/*
+ * snd_usb_endpoint_next_packet_size: Return the number of samples to be sent
+ * in the next packet
+ */
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx, int idx)
+{
+ if (ctx->packet_size[idx])
+ return ctx->packet_size[idx];
+ else if (ep->sync_master)
+ return slave_next_packet_size(ep);
+ else
+ return next_packet_size(ep);
+}
+
static void call_retire_callback(struct snd_usb_endpoint *ep,
struct urb *urb)
{
@@ -223,13 +237,7 @@ static void prepare_silent_urb(struct snd_usb_endpoint *ep,
unsigned int length;
int counts;
- if (ctx->packet_size[i])
- counts = ctx->packet_size[i];
- else if (ep->sync_master)
- counts = snd_usb_endpoint_slave_next_packet_size(ep);
- else
- counts = snd_usb_endpoint_next_packet_size(ep);
-
+ counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
length = counts * ep->stride; /* number of silent bytes */
offset = offs * ep->stride + extra * i;
urb->iso_frame_desc[i].offset = offset;
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index 201011d89659..11e3bb839fd7 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -45,7 +45,7 @@ void snd_usb_endpoint_release(struct snd_usb_endpoint *ep);
void snd_usb_endpoint_free(struct snd_usb_endpoint *ep);
int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep);
-int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep);
-int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep);
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx, int idx);
#endif /* __USBAUDIO_ENDPOINT_H */
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 95a6a854dc55..5953e22a72c5 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1512,13 +1512,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
spin_lock_irqsave(&subs->lock, flags);
subs->frame_limit += ep->max_urb_frames;
for (i = 0; i < ctx->packets; i++) {
- if (ctx->packet_size[i])
- counts = ctx->packet_size[i];
- else if (ep->sync_master)
- counts = snd_usb_endpoint_slave_next_packet_size(ep);
- else
- counts = snd_usb_endpoint_next_packet_size(ep);
-
+ counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
/* set up descriptor */
urb->iso_frame_desc[i].offset = frames * ep->stride;
urb->iso_frame_desc[i].length = counts * ep->stride;