2 files changed, 21 insertions, 4 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index d49325ed706f..587eddcad912 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -615,7 +615,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
   Module snd-hda-intel
   --------------------
 
-    Module for Intel HD Audio (ICH6, ICH6M, ICH7)
+    Module for Intel HD Audio (ICH6, ICH6M, ICH7), ATI SB450
 
     model       - force the model name
     position_fix - Fix DMA pointer (0 = FIFO size, 1 = none, 2 = POSBUF)
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 104593fa08eb..d8329a79bcd2 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -68,7 +68,8 @@ MODULE_LICENSE("GPL");
 MODULE_SUPPORTED_DEVICE("{{Intel, ICH6},"
                          "{Intel, ICH6M},"
                          "{Intel, ICH7},"
-                         "{Intel, ESB2}}");
+                         "{Intel, ESB2},"
+                         "{ATI, SB450}}");
 MODULE_DESCRIPTION("Intel HDA driver");
 
 #define SFX     "hda-intel: "
@@ -153,7 +154,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 
 /* STATESTS int mask: SD2,SD1,SD0 */
 #define STATESTS_INT_MASK       0x07
-#define AZX_MAX_CODECS          3
+#define AZX_MAX_CODECS          4
 
 /* SD_CTL bits */
 #define SD_CTL_STREAM_RESET     0x01    /* stream reset bit */
@@ -193,6 +194,12 @@ enum {
         POS_FIX_POSBUF
 };
 
+/* Defines for ATI HD Audio support in SB450 south bridge */
+#define ATI_SB450_HDAUDIO_PCI_DEVICE_ID     0x437b
+#define ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR   0x42
+#define ATI_SB450_HDAUDIO_ENABLE_SNOOP      0x02
+
+
 /*
  * Use CORB/RIRB for communication from/to codecs.
  * This is the way recommended by Intel (see below).
@@ -644,7 +651,7 @@ static void azx_stream_stop(azx_t *chip, azx_dev_t *azx_dev)
  */
 static void azx_init_chip(azx_t *chip)
 {
-        unsigned char tcsel_reg;
+        unsigned char tcsel_reg, ati_misc_cntl2;
 
         /* Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
          * TCSEL == Traffic Class Select Register, which sets PCI express QOS
@@ -668,6 +675,15 @@ static void azx_init_chip(azx_t *chip)
                 azx_writel(chip, DPLBASE, (u32)chip->posbuf.addr);
                 azx_writel(chip, DPUBASE, upper_32bit(chip->posbuf.addr));
         }
+
+        /* For ATI SB450 azalia HD audio, we need to enable snoop */
+        if (chip->pci->vendor == PCI_VENDOR_ID_ATI && 
+            chip->pci->device == ATI_SB450_HDAUDIO_PCI_DEVICE_ID) {
+                pci_read_config_byte(chip->pci, ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR, 
+                                     &ati_misc_cntl2);
+                pci_write_config_byte(chip->pci, ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR, 
+                                      (ati_misc_cntl2 & 0xf8) | ATI_SB450_HDAUDIO_ENABLE_SNOOP);
+        }
 }
 
 
@@ -1435,6 +1451,7 @@ static struct pci_device_id azx_ids[] = {
         { 0x8086, 0x2668, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* ICH6 */
         { 0x8086, 0x27d8, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* ICH7 */
         { 0x8086, 0x269a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* ESB2 */
+        { 0x1002, 0x437b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* ATI SB450 */
         { 0, }
 };
 MODULE_DEVICE_TABLE(pci, azx_ids);