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em28xx: don't load audio modules when AC97 is mis-detected

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With em2800 hardware, AC97 hardware can be detected even when it doesn't
exist. If, after probing for AC97, the driver won't find a companion
chip, simply prevents the load of the audio modules.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-11-27 13:52:54 -02:00
parent 1ca31892e3
commit 0731160aca
1 changed files with 8 additions and 1 deletions
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9
drivers/media/video/em28xx/em28xx-core.c
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@ -533,8 +533,15 @@ int em28xx_audio_setup(struct em28xx *dev)
vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
if (vid1 < 0) {
/* Device likely doesn't support AC97 */
/*
* Device likely doesn't support AC97
* Note: (some) em2800 devices without eeprom reports 0x91 on
* CHIPCFG register, even not having an AC97 chip
*/
em28xx_warn("AC97 chip type couldn't be determined\n");
dev->audio_mode.ac97 = EM28XX_NO_AC97;
dev->has_alsa_audio = 0;
dev->audio_mode.has_audio = 0;
goto init_audio;
}