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ALSA: hda - use LPIB for delay estimation 

DMA Position in Buffer (DPIB) should be used for
ring buffer management, while LPIB register provides
information on the number of samples transfered on
the link. The difference between the two pieces of
information corresponds to hardware/DMA buffering.

This patch reports this difference in runtime->delay, and
removes the use of the COMBO mode on recent Intel hardware.

Credits to Takashi Iwai for an initial patch.

[rebased to for-next branch and replaced snd_printk() with
 snd_printdd() by tiwai]

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pierre-Louis Bossart 2012-09-21 18:39:06 -05:00 committed by Takashi Iwai
parent 172d3b2096
commit 90accc58a6
1 changed files with 29 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
sound/pci/hda/hda_intel.c
View File

@ -555,6 +555,7 @@ enum {
#define AZX_DCAPS_ALIGN_BUFSIZE (1 << 22) /* buffer size alignment */
#define AZX_DCAPS_4K_BDLE_BOUNDARY (1 << 23) /* BDLE in 4k boundary */
#define AZX_DCAPS_POSFIX_COMBO (1 << 24) /* Use COMBO as default */
#define AZX_DCAPS_COUNT_LPIB_DELAY (1 << 25) /* Take LPIB as delay */
/* quirks for ATI SB / AMD Hudson */
#define AZX_DCAPS_PRESET_ATI_SB \
@ -2143,6 +2144,27 @@ static unsigned int azx_get_position(struct azx *chip,
if (pos >= azx_dev->bufsize)
pos = 0;
/* calculate runtime delay from LPIB */
if (azx_dev->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);
int delay;
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
delay = pos - lpib_pos;
else
delay = lpib_pos - pos;
if (delay < 0)
delay += azx_dev->bufsize;
if (delay >= azx_dev->period_bytes) {
snd_printdd("delay %d > period_bytes %d\n",
delay, azx_dev->period_bytes);
delay = 0; /* something is wrong */
}
azx_dev->substream->runtime->delay =
bytes_to_frames(azx_dev->substream->runtime, delay);
}
return pos;
}
@ -3402,7 +3424,7 @@ static DEFINE_PCI_DEVICE_TABLE(azx_ids) = {
/* CPT */
{ PCI_DEVICE(0x8086, 0x1c20),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* PBG */
{ PCI_DEVICE(0x8086, 0x1d20),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
@ -3410,26 +3432,26 @@ static DEFINE_PCI_DEVICE_TABLE(azx_ids) = {
/* Panther Point */
{ PCI_DEVICE(0x8086, 0x1e20),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* Lynx Point */
{ PCI_DEVICE(0x8086, 0x8c20),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* Lynx Point-LP */
{ PCI_DEVICE(0x8086, 0x9c20),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* Lynx Point-LP */
{ PCI_DEVICE(0x8086, 0x9c21),
.driver_data = AZX_DRIVER_PCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* Haswell */
{ PCI_DEVICE(0x8086, 0x0c0c),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
{ PCI_DEVICE(0x8086, 0x0d0c),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_SCH_SNOOP |
AZX_DCAPS_BUFSIZE | AZX_DCAPS_POSFIX_COMBO },
AZX_DCAPS_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY },
/* SCH */
{ PCI_DEVICE(0x8086, 0x811b),
.driver_data = AZX_DRIVER_SCH | AZX_DCAPS_SCH_SNOOP |