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path: root/sound/firewire/fireface/ff-stream.c
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Diffstat (limited to 'sound/firewire/fireface/ff-stream.c')
-rw-r--r--sound/firewire/fireface/ff-stream.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/sound/firewire/fireface/ff-stream.c b/sound/firewire/fireface/ff-stream.c
index 59ca2e84d41c..e6fa6362dab7 100644
--- a/sound/firewire/fireface/ff-stream.c
+++ b/sound/firewire/fireface/ff-stream.c
@@ -73,10 +73,44 @@ static void release_resources(struct snd_ff *ff)
fw_iso_resources_free(&ff->rx_resources);
}
+static int switch_fetching_mode(struct snd_ff *ff, bool enable)
+{
+ unsigned int count;
+ __le32 *reg;
+ int i;
+ int err;
+
+ count = 0;
+ for (i = 0; i < SND_FF_STREAM_MODES; ++i)
+ count = max(count, ff->spec->pcm_playback_channels[i]);
+
+ reg = kcalloc(count, sizeof(__le32), GFP_KERNEL);
+ if (!reg)
+ return -ENOMEM;
+
+ if (!enable) {
+ /*
+ * Each quadlet is corresponding to data channels in a data
+ * blocks in reverse order. Precisely, quadlets for available
+ * data channels should be enabled. Here, I take second best
+ * to fetch PCM frames from all of data channels regardless of
+ * stf.
+ */
+ for (i = 0; i < count; ++i)
+ reg[i] = cpu_to_le32(0x00000001);
+ }
+
+ err = snd_fw_transaction(ff->unit, TCODE_WRITE_BLOCK_REQUEST,
+ SND_FF_REG_FETCH_PCM_FRAMES, reg,
+ sizeof(__le32) * count, 0);
+ kfree(reg);
+ return err;
+}
+
static inline void finish_session(struct snd_ff *ff)
{
ff->spec->protocol->finish_session(ff);
- ff->spec->protocol->switch_fetching_mode(ff, false);
+ switch_fetching_mode(ff, false);
}
static int init_stream(struct snd_ff *ff, enum amdtp_stream_direction dir)
@@ -188,7 +222,7 @@ int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
goto error;
}
- err = ff->spec->protocol->switch_fetching_mode(ff, true);
+ err = switch_fetching_mode(ff, true);
if (err < 0)
goto error;
}