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[ALSA] cmipci: check that the legacy MIDI port works

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Check that the UART_EN bit actually enabled the MPU-401 port.
Apparently, C-Media thinks that it is a good idea to be paranoid here.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Clemens Ladisch 2007-09-03 09:56:23 +02:00 committed by Jaroslav Kysela
parent c78c950d28
commit 88039815d8
1 changed files with 7 additions and 0 deletions
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7
sound/pci/cmipci.c
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@ -3012,6 +3012,13 @@ static int __devinit snd_cmipci_create(struct snd_card *card, struct pci_dev *pc
snd_cmipci_write(cm, CM_REG_LEGACY_CTRL, val);
/* enable UART */
snd_cmipci_set_bit(cm, CM_REG_FUNCTRL1, CM_UART_EN);
if (inb(iomidi + 1) == 0xff) {
snd_printk(KERN_ERR "cannot enable MPU-401 port"
" at %#lx\n", iomidi);
snd_cmipci_clear_bit(cm, CM_REG_FUNCTRL1,
CM_UART_EN);
iomidi = 0;
}
}
}