[ALSA] atiixp - Add a parameter ac97_quirk

Add an option to specify the AC'97 codec instead of
probing.  This is a fix for bugzilla #7467.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

2 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index c54fd7c258d9..d853a303ffcb 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -242,6 +242,12 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     ac97_clock          - AC'97 clock (default = 48000)
     ac97_quirk          - AC'97 workaround for strange hardware
                           See "AC97 Quirk Option" section below.
+    ac97_codec          - Workaround to specify which AC'97 codec 
+                          instead of probing.  If this works for you
+                          file a bug with your `lspci -vn` output.
+                          -2  -- Force probing.
+                          -1  -- Default behavior.
+                          0-2 -- Use the specified codec.
     spdif_aclink        - S/PDIF transfer over AC-link (default = 1)
 
     This module supports one card and autoprobe.
diff --git a/sound/pci/atiixp.c b/sound/pci/atiixp.c
index 86710df71a8e..92df811d695d 100644
--- a/sound/pci/atiixp.c
+++ b/sound/pci/atiixp.c
@@ -45,6 +45,7 @@ static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
 static int ac97_clock = 48000;
 static char *ac97_quirk;
 static int spdif_aclink = 1;
+static int ac97_codec = -1;
 
 module_param(index, int, 0444);
 MODULE_PARM_DESC(index, "Index value for ATI IXP controller.");
@@ -54,6 +55,8 @@ module_param(ac97_clock, int, 0444);
 MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
 module_param(ac97_quirk, charp, 0444);
 MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
+module_param(ac97_codec, int, 0444);
+MODULE_PARM_DESC(ac97_codec, "Specify codec instead of probing.");
 module_param(spdif_aclink, bool, 0444);
 MODULE_PARM_DESC(spdif_aclink, "S/PDIF over AC-link.");
 
@@ -293,6 +296,22 @@ static struct pci_device_id snd_atiixp_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, snd_atiixp_ids);
 
+struct atiixp_quirk {
+        unsigned short  subvendor;
+        unsigned short  subdevice;
+        const char *name;
+        int ac97_codec;
+};
+
+static struct atiixp_quirk atiixp_quirks[] __devinitdata = {
+        {
+                .subvendor = 0x15bd,
+                .subdevice = 0x3100,
+                .name = "DFI RS482",
+                .ac97_codec = 0,
+        },
+        { .subvendor = 0 } /* terminator */
+};
 
 /*
  * lowlevel functions
@@ -553,11 +572,37 @@ static int snd_atiixp_aclink_down(struct atiixp *chip)
              ATI_REG_ISR_CODEC2_NOT_READY)
 #define CODEC_CHECK_BITS (ALL_CODEC_NOT_READY|ATI_REG_ISR_NEW_FRAME)
 
+static int ac97_probing_bugs(struct pci_dev *pci)
+{
+        int i = 0;
+
+        while (atiixp_quirks[i].subvendor) {
+                if (pci->subsystem_vendor == atiixp_quirks[i].subvendor  &&
+                    pci->subsystem_device == atiixp_quirks[i].subdevice) {
+                        printk(KERN_INFO "Atiixp quirk for %s.  "
+                               "Forcing codec %d\n", atiixp_quirks[i].name, 
+                               atiixp_quirks[i].ac97_codec);
+                        return atiixp_quirks[i].ac97_codec;
+                }
+                i++;
+        }
+        /* this hardware doesn't need workarounds.  Probe for codec */
+        return -1;
+}
+
 static int snd_atiixp_codec_detect(struct atiixp *chip)
 {
         int timeout;
 
         chip->codec_not_ready_bits = 0;
+        if (ac97_codec == -1)
+                ac97_codec = ac97_probing_bugs(chip->pci);
+        if (ac97_codec >= 0) {
+                chip->codec_not_ready_bits |= 
+                        CODEC_CHECK_BITS ^ (1 << (ac97_codec + 10));
+                return 0;
+        }
+
         atiixp_write(chip, IER, CODEC_CHECK_BITS);
         /* wait for the interrupts */
         timeout = 50;