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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>
This commit is contained in:
Takashi Iwai 2013-04-05 07:27:45 +02:00
parent 1dc669fed6
commit 21229613ef
2 changed files with 17 additions and 4 deletions
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3
sound/pci/hda/hda_codec.h
View File

@ -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 */

18
sound/pci/hda/hda_intel.c
View File

@ -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;
}