[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>

1 files changed, 7 insertions, 1 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 3d7f36fb4cf0..5f160eebd15c 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)