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authorClemens Ladisch <clemens@ladisch.de>2006-11-20 14:14:39 +0100
committerJaroslav Kysela <perex@suse.cz>2007-01-09 09:06:15 +0100
commit987411b7d899fd9b838d4ce32b45be0741c4ee22 (patch)
tree606d3a67a3476910f6e56915fdad18df4a59c385 /sound/usb
parent5929546a96d55962bdcabae0c4e25dfcd9f1fda9 (diff)
[ALSA] usb-audio: work around wrong frequency in CM6501 descriptors
The C-Media CM6501 chip's descriptors say that altsetting 5 supports 48 kHz, but it actually plays at 96 kHz. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/usbaudio.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 3d7f36fb4cf..5f160eebd15 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2471,7 +2471,13 @@ static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioform
fp->nr_rates = nr_rates;
fp->rate_min = fp->rate_max = combine_triple(&fmt[8]);
for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
- unsigned int rate = fp->rate_table[r] = combine_triple(&fmt[idx]);
+ unsigned int rate = combine_triple(&fmt[idx]);
+ /* C-Media CM6501 mislabels its 96 kHz altsetting */
+ if (rate == 48000 && nr_rates == 1 &&
+ chip->usb_id == USB_ID(0x0d8c, 0x0201) &&
+ fp->altsetting == 5 && fp->maxpacksize == 392)
+ rate = 96000;
+ fp->rate_table[r] = rate;
if (rate < fp->rate_min)
fp->rate_min = rate;
else if (rate > fp->rate_max)