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Commit 987411b7 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
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[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: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 5929546a

sound/usb/usbaudio.c

+7 −1
Original line number Diff line number Diff line
@@ -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)