ALSA: oxygen: add XIO2001 initialization

Configure the XIO2001 bridge on PCI Express cards so that it does less
needless prefetching.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 10 insertions, 1 deletions

diff --git a/sound/pci/oxygen/oxygen_lib.c b/sound/pci/oxygen/oxygen_lib.c
index ab47c1ca21c4..ffff3b25fd73 100644
--- a/sound/pci/oxygen/oxygen_lib.c
+++ b/sound/pci/oxygen/oxygen_lib.c
@@ -319,11 +319,12 @@ static void oxygen_restore_eeprom(struct oxygen *chip,
 
 static void configure_pcie_bridge(struct pci_dev *pci)
 {
-        enum { PEX811X, PI7C9X110 };
+        enum { PEX811X, PI7C9X110, XIO2001 };
         static const struct pci_device_id bridge_ids[] = {
                 { PCI_VDEVICE(PLX, 0x8111), .driver_data = PEX811X },
                 { PCI_VDEVICE(PLX, 0x8112), .driver_data = PEX811X },
                 { PCI_DEVICE(0x12d8, 0xe110), .driver_data = PI7C9X110 },
+                { PCI_VDEVICE(TI, 0x8240), .driver_data = XIO2001 },
                 { }
         };
         struct pci_dev *bridge;
@@ -357,6 +358,14 @@ static void configure_pcie_bridge(struct pci_dev *pci)
                 tmp |= 1;       /* park the PCI arbiter to the sound chip */
                 pci_write_config_dword(bridge, 0x40, tmp);
                 break;
+
+        case XIO2001: /* Texas Instruments XIO2001 PCIe/PCI bridge */
+                pci_read_config_dword(bridge, 0xe8, &tmp);
+                tmp &= ~0xf;    /* request length limit: 64 bytes */
+                tmp &= ~(0xf << 8);
+                tmp |= 1 << 8;  /* request count limit: one buffer */
+                pci_write_config_dword(bridge, 0xe8, tmp);
+                break;
         }
 }