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auich: Always enable PCI bus mastering.

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Without it, the device can't operate at all. Whether or not this is
enabled already is firmware dependent. It was off under QEMU when used
with "-soundhw ac97" and this makes the driver work there.

Fixes #10551 where the syslog shows that this can also happen on real
hardware that is otherwise fully configured.
This commit is contained in:
Michael Lotz 2020-08-16 21:45:47 +02:00
parent 105519f79a
commit c839d521c4
1 changed files with 1 additions and 0 deletions
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src/add-ons/kernel/drivers/audio/ac97/auich/auich.c
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@ -676,6 +676,7 @@ auich_setup(auich_dev * card)
cmd = (*pci->read_pci_config)(card->info.bus, card->info.device,
card->info.function, PCI_command, 2);
PRINT(("PCI command before: %x\n", cmd));
cmd |= PCI_command_master;
if (IS_ICH4(&card->config)) {
(*pci->write_pci_config)(card->info.bus, card->info.device,
card->info.function, PCI_command, 2, cmd | PCI_command_memory);