ALSA: hda - Introduce get_delay codec PCM ops

Add a new codec PCM ops, get_delay(), to obtain the codec/stream-
specific PCM delay count.  When it's NULL, nothing changes.

This new feature was requested for CA0132, which has significant
delays in the path depending on the running DSP code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 17 insertions, 4 deletions

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 23ca1722aff1..c93f9021f452 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -757,6 +757,9 @@ struct hda_pcm_ops {
                        struct snd_pcm_substream *substream);
         int (*cleanup)(struct hda_pcm_stream *info, struct hda_codec *codec,
                        struct snd_pcm_substream *substream);
+        unsigned int (*get_delay)(struct hda_pcm_stream *info,
+                                  struct hda_codec *codec,
+                                  struct snd_pcm_substream *substream);
 };
 
 /* PCM information for each substream */
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 418bfc0eb0a3..735567e86f74 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2349,8 +2349,11 @@ static unsigned int azx_get_position(struct azx *chip,
                                      struct azx_dev *azx_dev,
                                      bool with_check)
 {
+        struct snd_pcm_substream *substream = azx_dev->substream;
+        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
         unsigned int pos;
-        int stream = azx_dev->substream->stream;
+        int stream = substream->stream;
+        struct hda_pcm_stream *hinfo = apcm->hinfo[stream];
         int delay = 0;
 
         switch (chip->position_fix[stream]) {
@@ -2381,7 +2384,7 @@ static unsigned int azx_get_position(struct azx *chip,
                 pos = 0;
 
         /* calculate runtime delay from LPIB */
-        if (azx_dev->substream->runtime &&
+        if (substream->runtime &&
             chip->position_fix[stream] == POS_FIX_POSBUF &&
             (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)) {
                 unsigned int lpib_pos = azx_sd_readl(azx_dev, SD_LPIB);
@@ -2399,9 +2402,16 @@ static unsigned int azx_get_position(struct azx *chip,
                         delay = 0;
                         chip->driver_caps &= ~AZX_DCAPS_COUNT_LPIB_DELAY;
                 }
-                azx_dev->substream->runtime->delay =
-                        bytes_to_frames(azx_dev->substream->runtime, delay);
+                delay = bytes_to_frames(substream->runtime, delay);
         }
+
+        if (substream->runtime) {
+                if (hinfo->ops.get_delay)
+                        delay += hinfo->ops.get_delay(hinfo, apcm->codec,
+                                                      substream);
+                substream->runtime->delay = delay;
+        }
+
         trace_azx_get_position(chip, azx_dev, pos, delay);
         return pos;
 }