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[ALSA] snd-hda-intel: Improve azx_position_ok() 

Add back the zero return value (activate workqueue) when
bdl_pos_adj is nonzero for position check.

Do the position related check only for first next period
using wallclk counter.

Return -1 value (ignore interrupt) when period_bytes
variable is zero.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-05-11 12:10:47 +02:00
parent e54637205b
commit f48f606d9f
1 changed files with 7 additions and 6 deletions
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13
sound/pci/hda/hda_intel.c
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@ -1890,9 +1890,8 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
unsigned int pos;
int stream;
wallclk = azx_readl(chip, WALLCLK);
if ((wallclk - azx_dev->start_wallclk) <
(azx_dev->period_wallclk * 2) / 3)
wallclk = azx_readl(chip, WALLCLK) - azx_dev->start_wallclk;
if (wallclk < (azx_dev->period_wallclk * 2) / 3)
return -1; /* bogus (too early) interrupt */
stream = azx_dev->substream->stream;
@ -1910,9 +1909,11 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
if (WARN_ONCE(!azx_dev->period_bytes,
"hda-intel: zero azx_dev->period_bytes"))
return 0; /* this shouldn't happen! */
if (pos % azx_dev->period_bytes > azx_dev->period_bytes / 2)
return 0; /* NG - it's below the period boundary */
return -1; /* this shouldn't happen! */
if (wallclk <= azx_dev->period_wallclk &&
pos % azx_dev->period_bytes > azx_dev->period_bytes / 2)
/* NG - it's below the first next period boundary */
return bdl_pos_adj[chip->dev_index] ? 0 : -1;
azx_dev->start_wallclk = wallclk;
return 1; /* OK, it's fine */
}