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ALSA: hda - Fixes distorted recording on US15W chipset 

The HDA controller in US15W (Poulsbo) reports inaccurate position values
for capture streams when using the LPIB read method, resulting in
distorted recordings.

However, using the position buffer is broken for playback streams,
resulting in a fallback to the LPIB method with the current driver.
This patch works around the issue by independently detecting the read
position method for capture and playback streams.

The patch will not have any effect if the position fix method is
explicitly set.

[Code simplified by tiwai]

Signed-off-by: Shahin Ghazinouri <shahin.ghazinouri@pelagicore.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Shahin Ghazinouri 2010-05-11 08:19:55 +02:00 committed by Takashi Iwai
parent 5433137336
commit beaffc3993
1 changed files with 22 additions and 14 deletions
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36
sound/pci/hda/hda_intel.c
View File

@ -425,7 +425,7 @@ struct azx {
struct snd_dma_buffer posbuf;
/* flags */
int position_fix;
int position_fix[2]; /* for both playback/capture streams */
int poll_count;
unsigned int running :1;
unsigned int initialized :1;
@ -1306,8 +1306,10 @@ static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
azx_sd_writel(azx_dev, SD_BDLPU, upper_32_bits(azx_dev->bdl.addr));
/* enable the position buffer */
if (chip->position_fix == POS_FIX_POSBUF ||
chip->position_fix == POS_FIX_AUTO ||
if (chip->position_fix[0] == POS_FIX_POSBUF ||
chip->position_fix[0] == POS_FIX_AUTO ||
chip->position_fix[1] == POS_FIX_POSBUF ||
chip->position_fix[1] == POS_FIX_AUTO ||
chip->via_dmapos_patch) {
if (!(azx_readl(chip, DPLBASE) & ICH6_DPLBASE_ENABLE))
azx_writel(chip, DPLBASE,
@ -1847,13 +1849,16 @@ static unsigned int azx_get_position(struct azx *chip,
if (chip->via_dmapos_patch)
pos = azx_via_get_position(chip, azx_dev);
else if (chip->position_fix == POS_FIX_POSBUF ||
chip->position_fix == POS_FIX_AUTO) {
/* use the position buffer */
pos = le32_to_cpu(*azx_dev->posbuf);
} else {
/* read LPIB */
pos = azx_sd_readl(azx_dev, SD_LPIB);
else {
int stream = azx_dev->substream->stream;
if (chip->position_fix[stream] == POS_FIX_POSBUF ||
chip->position_fix[stream] == POS_FIX_AUTO) {
/* use the position buffer */
pos = le32_to_cpu(*azx_dev->posbuf);
} else {
/* read LPIB */
pos = azx_sd_readl(azx_dev, SD_LPIB);
}
}
if (pos >= azx_dev->bufsize)
pos = 0;
@ -1881,22 +1886,24 @@ static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
{
unsigned int pos;
int stream;
if (azx_dev->start_flag &&
time_before_eq(jiffies, azx_dev->start_jiffies))
return -1; /* bogus (too early) interrupt */
azx_dev->start_flag = 0;
stream = azx_dev->substream->stream;
pos = azx_get_position(chip, azx_dev);
if (chip->position_fix == POS_FIX_AUTO) {
if (chip->position_fix[stream] == POS_FIX_AUTO) {
if (!pos) {
printk(KERN_WARNING
"hda-intel: Invalid position buffer, "
"using LPIB read method instead.\n");
chip->position_fix = POS_FIX_LPIB;
chip->position_fix[stream] = POS_FIX_LPIB;
pos = azx_get_position(chip, azx_dev);
} else
chip->position_fix = POS_FIX_POSBUF;
chip->position_fix[stream] = POS_FIX_POSBUF;
}
if (!bdl_pos_adj[chip->dev_index])
@ -2435,7 +2442,8 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
chip->dev_index = dev;
INIT_WORK(&chip->irq_pending_work, azx_irq_pending_work);
chip->position_fix = check_position_fix(chip, position_fix[dev]);
chip->position_fix[0] = chip->position_fix[1] =
check_position_fix(chip, position_fix[dev]);
check_probe_mask(chip, dev);
chip->single_cmd = single_cmd;