[ALSA] hda-intel - Auto-correction of the DMA position mode
Modules: HDA Intel driver
Switch the method to measure the current DMA position automatically
from position-buffer mode to LPIB-read mode with a sanity check.
Some hardwares seems to have problem with the position buffer.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 016fbc2..c096606 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -250,7 +250,6 @@
unsigned int fragsize; /* size of each period in bytes */
unsigned int frags; /* number for period in the play buffer */
unsigned int fifo_size; /* FIFO size */
- unsigned int last_pos; /* last updated period position */
void __iomem *sd_addr; /* stream descriptor pointer */
@@ -261,10 +260,11 @@
unsigned int format_val; /* format value to be set in the controller and the codec */
unsigned char stream_tag; /* assigned stream */
unsigned char index; /* stream index */
+ /* for sanity check of position buffer */
+ unsigned int period_intr;
unsigned int opened: 1;
unsigned int running: 1;
- unsigned int period_updating: 1;
};
/* CORB/RIRB */
@@ -804,11 +804,10 @@
if (status & azx_dev->sd_int_sta_mask) {
azx_sd_writeb(azx_dev, SD_STS, SD_INT_MASK);
if (azx_dev->substream && azx_dev->running) {
- azx_dev->period_updating = 1;
+ azx_dev->period_intr++;
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(azx_dev->substream);
spin_lock(&chip->reg_lock);
- azx_dev->period_updating = 0;
}
}
}
@@ -1119,7 +1118,6 @@
azx_dev->fifo_size = azx_sd_readw(azx_dev, SD_FIFOSIZE) + 1;
else
azx_dev->fifo_size = 0;
- azx_dev->last_pos = 0;
return hinfo->ops.prepare(hinfo, apcm->codec, azx_dev->stream_tag,
azx_dev->format_val, substream);
@@ -1167,10 +1165,20 @@
struct azx_dev *azx_dev = get_azx_dev(substream);
unsigned int pos;
- if (chip->position_fix == POS_FIX_POSBUF) {
+ if (chip->position_fix == POS_FIX_POSBUF ||
+ chip->position_fix == POS_FIX_AUTO) {
/* use the position buffer */
pos = *azx_dev->posbuf;
+ if (chip->position_fix == POS_FIX_AUTO &&
+ azx_dev->period_intr == 1 && ! pos) {
+ printk(KERN_WARNING
+ "hda-intel: Invalid position buffer, "
+ "using LPIB read method instead.\n");
+ chip->position_fix = POS_FIX_NONE;
+ goto read_lpib;
+ }
} else {
+ read_lpib:
/* read LPIB */
pos = azx_sd_readl(azx_dev, SD_LPIB);
if (chip->position_fix == POS_FIX_FIFO)
@@ -1441,7 +1449,7 @@
chip->irq = -1;
chip->driver_type = driver_type;
- chip->position_fix = position_fix ? position_fix : POS_FIX_POSBUF;
+ chip->position_fix = position_fix;
chip->single_cmd = single_cmd;
#if BITS_PER_LONG != 64