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ALSA: hda - Suppress CORBRP clear on Nvidia controller chips

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The recent commit (ca460f8652) changed the CORB RP reset procedure to
follow the specification with a couple of sanity checks.
Unfortunately, Nvidia controller chips seem not following this way,
and spew the warning messages like:
  snd_hda_intel 0000:00:10.1: CORB reset timeout#1, CORBRP = 0

This patch adds the workaround for such chips.  It just skips the new
reset procedure for the known broken chips.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2014-04-29 18:38:21 +02:00
parent e32dfbed8c
commit 6ba736dd02
3 changed files with 21 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
sound/pci/hda/hda_controller.c
View File

@@ -1059,24 +1059,26 @@ static void azx_init_cmd_io(struct azx *chip)
/* reset the corb hw read pointer */
azx_writew(chip, CORBRP, ICH6_CORBRP_RST);
for (timeout = 1000; timeout > 0; timeout--) {
if ((azx_readw(chip, CORBRP) & ICH6_CORBRP_RST) == ICH6_CORBRP_RST)
break;
udelay(1);
}
if (timeout <= 0)
dev_err(chip->card->dev, "CORB reset timeout#1, CORBRP = %d\n",
azx_readw(chip, CORBRP));
if (!(chip->driver_caps & AZX_DCAPS_CORBRP_SELF_CLEAR)) {
for (timeout = 1000; timeout > 0; timeout--) {
if ((azx_readw(chip, CORBRP) & ICH6_CORBRP_RST) == ICH6_CORBRP_RST)
break;
udelay(1);
}
if (timeout <= 0)
dev_err(chip->card->dev, "CORB reset timeout#1, CORBRP = %d\n",
azx_readw(chip, CORBRP));
azx_writew(chip, CORBRP, 0);
for (timeout = 1000; timeout > 0; timeout--) {
if (azx_readw(chip, CORBRP) == 0)
break;
udelay(1);
azx_writew(chip, CORBRP, 0);
for (timeout = 1000; timeout > 0; timeout--) {
if (azx_readw(chip, CORBRP) == 0)
break;
udelay(1);
}
if (timeout <= 0)
dev_err(chip->card->dev, "CORB reset timeout#2, CORBRP = %d\n",
azx_readw(chip, CORBRP));
}
if (timeout <= 0)
dev_err(chip->card->dev, "CORB reset timeout#2, CORBRP = %d\n",
azx_readw(chip, CORBRP));
/* enable corb dma */
azx_writeb(chip, CORBCTL, ICH6_CORBCTL_RUN);