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sound: oxygen: fix for PI7C9X110 compatibility 

If the card is used with a Pericom PI7C9X110 PCI-E/PCI bridge,
reconfigure the latter's PCI buffering to fix an unknown problem.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-09-28 11:05:58 +02:00 committed by Takashi Iwai
parent 87b61902ce
commit 362bc24d67
1 changed files with 23 additions and 0 deletions
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23
sound/pci/oxygen/oxygen_lib.c
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@ -307,6 +307,28 @@ static void oxygen_restore_eeprom(struct oxygen *chip,
}
}
static void pci_bridge_magic(void)
{
struct pci_dev *pci = NULL;
u32 tmp;
for (;;) {
/* If there is any Pericom PI7C9X110 PCI-E/PCI bridge ... */
pci = pci_get_device(0x12d8, 0xe110, pci);
if (!pci)
break;
/*
* ... configure its secondary internal arbiter to park to
* the secondary port, instead of to the last master.
*/
if (!pci_read_config_dword(pci, 0x40, &tmp)) {
tmp |= 1;
pci_write_config_dword(pci, 0x40, tmp);
}
/* Why? Try asking C-Media. */
}
}
static void oxygen_init(struct oxygen *chip)
{
unsigned int i;
@ -585,6 +607,7 @@ int oxygen_pci_probe(struct pci_dev *pci, int index, char *id,
snd_card_set_dev(card, &pci->dev);
card->private_free = oxygen_card_free;
pci_bridge_magic();
oxygen_init(chip);
chip->model.init(chip);