ALSA: hda - Suppress CORBRP clear on Nvidia controller chips

The recent commit (ca460f86521) 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>

1 files changed, 18 insertions, 16 deletions

diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 248b90abb882..480bbddbd801 100644
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -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);