From 987411b7d899fd9b838d4ce32b45be0741c4ee22 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Mon, 20 Nov 2006 14:14:39 +0100 Subject: [PATCH] [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 Signed-off-by: Jaroslav Kysela --- sound/usb/usbaudio.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) 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) -- 2.20.1