From: Clemens Ladisch <clemens@ladisch.de>
Date: Sun, 13 May 2012 16:49:14 +0000 (+0200)
Subject: ALSA: firewire-lib: flush completed packets when reading PCM position
X-Git-Url: https://rtime.felk.cvut.cz/gitweb/linux-imx.git/commitdiff_plain/e9148dddc3c7b6121300319c3e31f9380d459be8

ALSA: firewire-lib: flush completed packets when reading PCM position

By flushing all completed but not yet reported packets before reading
the PCM hardware position, the granularity of the pointer is improved
from the interrupt interval to the packet size.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 3284ee9c1eca..c2685fbd7366 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -531,6 +531,20 @@ err_unlock:
 }
 EXPORT_SYMBOL(amdtp_out_stream_start);
 
+/**
+ * amdtp_out_stream_pcm_pointer - get the PCM buffer position
+ * @s: the AMDTP output stream that transports the PCM data
+ *
+ * Returns the current buffer position, in frames.
+ */
+unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
+{
+	fw_iso_context_flush_completions(s->context);
+
+	return ACCESS_ONCE(s->pcm_buffer_pointer);
+}
+EXPORT_SYMBOL(amdtp_out_stream_pcm_pointer);
+
 /**
  * amdtp_out_stream_update - update the stream after a bus reset
  * @s: the AMDTP output stream
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index 4987f826f9f3..3f13ff63c5d2 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -84,6 +84,7 @@ void amdtp_out_stream_stop(struct amdtp_out_stream *s);
 void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
 				     snd_pcm_format_t format);
 void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
+unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
 void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
 
 /**
@@ -140,18 +141,6 @@ static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
 	ACCESS_ONCE(s->pcm) = pcm;
 }
 
-/**
- * amdtp_out_stream_pcm_pointer - get the PCM buffer position
- * @s: the AMDTP output stream that transports the PCM data
- *
- * Returns the current buffer position, in frames.
- */
-static inline unsigned long
-amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
-{
-	return ACCESS_ONCE(s->pcm_buffer_pointer);
-}
-
 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
 {
 	return sfc & 1;