ALSA: firewire-lib/dice: add arrangements of PCM pointer and interrupts for Dice quirk

In IEC 61883-6, one data block transfers one event. In ALSA, the event equals one PCM frame,
hence one data block transfers one PCM frame. But Dice has a quirk at higher sampling rate
(176.4/192.0 kHz) that one data block transfers two PCM frames.

Commit 10550bea44a8 ("ALSA: dice/firewire-lib: Keep dualwire mode but obsolete
CIP_HI_DUALWIRE") moved some codes related to this quirk into Dice driver. But the commit
forgot to add arrangements for PCM period interrupts and DMA pointer updates. As a result, Dice
driver cannot work correctly at higher sampling rate.

This commit adds 'double_pcm_frames' parameter to amdtp structure for this quirk. When this
parameter is set, PCM period interrupts and DMA pointer updates occur at double speed than in
IEC 61883-6.

Reported-by: Daniel Robbins <drobbins@funtoo.org>
Fixes: 10550bea44a8 ("ALSA: dice/firewire-lib: Keep dualwire mode but obsolete CIP_HI_DUALWIRE")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: <stable@vger.kernel.org> # 3.16
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 22 insertions, 5 deletions

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index f96bf4c7c232..95fc2eaf11dc 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -507,7 +507,16 @@ static void amdtp_pull_midi(struct amdtp_stream *s,
 static void update_pcm_pointers(struct amdtp_stream *s,
                                 struct snd_pcm_substream *pcm,
                                 unsigned int frames)
-{       unsigned int ptr;
+{
+        unsigned int ptr;
+
+        /*
+         * In IEC 61883-6, one data block represents one event. In ALSA, one
+         * event equals to one PCM frame. But Dice has a quirk to transfer
+         * two PCM frames in one data block.
+         */
+        if (s->double_pcm_frames)
+                frames *= 2;
 
         ptr = s->pcm_buffer_pointer + frames;
         if (ptr >= pcm->runtime->buffer_size)
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index d8ee7b0e9386..4823c08196ac 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -125,6 +125,7 @@ struct amdtp_stream {
         unsigned int pcm_buffer_pointer;
         unsigned int pcm_period_pointer;
         bool pointer_flush;
+        bool double_pcm_frames;
 
         struct snd_rawmidi_substream *midi[AMDTP_MAX_CHANNELS_FOR_MIDI * 8];
 
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 4cf8eb704045..e3a04d69c853 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -567,10 +567,14 @@ static int dice_hw_params(struct snd_pcm_substream *substream,
                 return err;
 
         /*
-         * At rates above 96 kHz, pretend that the stream runs at half the
-         * actual sample rate with twice the number of channels; two samples
-         * of a channel are stored consecutively in the packet. Requires
-         * blocking mode and PCM buffer size should be aligned to SYT_INTERVAL.
+         * At 176.4/192.0 kHz, Dice has a quirk to transfer two PCM frames in
+         * one data block of AMDTP packet. Thus sampling transfer frequency is
+         * a half of PCM sampling frequency, i.e. PCM frames at 192.0 kHz are
+         * transferred on AMDTP packets at 96 kHz. Two successive samples of a
+         * channel are stored consecutively in the packet. This quirk is called
+         * as 'Dual Wire'.
+         * For this quirk, blocking mode is required and PCM buffer size should
+         * be aligned to SYT_INTERVAL.
          */
         channels = params_channels(hw_params);
         if (rate_index > 4) {
@@ -581,6 +585,9 @@ static int dice_hw_params(struct snd_pcm_substream *substream,
 
                 rate /= 2;
                 channels *= 2;
+                dice->stream.double_pcm_frames = true;
+        } else {
+                dice->stream.double_pcm_frames = false;
         }
 
         mode = rate_index_to_mode(rate_index);