[ALSA] HDA - enable snoop on SCH

This patch enables snoop on Intel SCH chipset, eliminating static during
playback.

Signed-off-by: Tobin Davis <tdavis@dsl-only.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 56f8a305075..a1098bb875d 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -275,6 +275,11 @@ enum {
 #define NVIDIA_HDA_TRANSREG_ADDR      0x4e
 #define NVIDIA_HDA_ENABLE_COHBITS     0x0f
 
+/* Defines for Intel SCH HDA snoop control */
+#define INTEL_SCH_HDA_DEVC      0x78
+#define INTEL_SCH_HDA_DEVC_NOSNOOP       (0x1<<11)
+
+
 /*
  */
 
@@ -868,6 +873,8 @@ static void update_pci_byte(struct pci_dev *pci, unsigned int reg,
 
 static void azx_init_pci(struct azx *chip)
 {
+        unsigned short snoop;
+
         /* Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
          * TCSEL == Traffic Class Select Register, which sets PCI express QOS
          * Ensuring these bits are 0 clears playback static on some HD Audio
@@ -888,6 +895,19 @@ static void azx_init_pci(struct azx *chip)
                                 NVIDIA_HDA_TRANSREG_ADDR,
                                 0x0f, NVIDIA_HDA_ENABLE_COHBITS);
                 break;
+        case AZX_DRIVER_SCH:
+                pci_read_config_word(chip->pci, INTEL_SCH_HDA_DEVC, &snoop);
+                if (snoop & INTEL_SCH_HDA_DEVC_NOSNOOP) {
+                        pci_write_config_word(chip->pci, INTEL_SCH_HDA_DEVC, \
+                                snoop & (~INTEL_SCH_HDA_DEVC_NOSNOOP));
+                        pci_read_config_word(chip->pci,
+                                INTEL_SCH_HDA_DEVC, &snoop);
+                        snd_printdd("HDA snoop disabled, enabling ... %s\n",\
+                                (snoop & INTEL_SCH_HDA_DEVC_NOSNOOP) \
+                                ? "Failed" : "OK");
+                }
+                break;
+
         }
 }
 
@@ -1040,6 +1060,7 @@ static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
 
 static unsigned int azx_max_codecs[] __devinitdata = {
         [AZX_DRIVER_ICH] = 3,
+        [AZX_DRIVER_SCH] = 3,
         [AZX_DRIVER_ATI] = 4,
         [AZX_DRIVER_ATIHDMI] = 4,
         [AZX_DRIVER_VIA] = 3,           /* FIXME: correct? */