В Пн, 03/02/2020 в 11:23 +0100, Tobias пишет: > Dear Alexander - unfortunately I did hot hear back from you. I guess > this may not be your highest priority but still - do you have any > other > idea to make the MC7000 sound device working? Thanks a lot. I think it should be safe to ignore clock validity check result if: - only one single sample rate is supported; - the clock source is internal, - there is no clock selector. Could you try the following patch? diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 018b1ecb5404..636c340d4f9f 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -197,6 +197,38 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, return data ? true : false; } +/* + * Assume the clock is valid if clock source supports only one single sample + * rate, its type is not external and there is no clock selector. This is needed + * for some Denon DJ controllers, that always report that clock is invalid. + */ +static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, + struct audioformat *fmt, + int clock) +{ + if (fmt->protocol == UAC_VERSION_3) { + struct uac3_clock_source_descriptor *cs_desc = + snd_usb_find_clock_source_v3(chip->ctrl_intf, clock); + + if (!cs_desc) + return false; + + return (fmt->nr_rates == 1 && + (fmt->clock & 0xff) == cs_desc->bClockID && + (cs_desc->bmAttributes & 0x1) != UAC3_CLOCK_SOURCE_TYPE_EXT); + } else { /* UAC_VERSION_2 */ + struct uac_clock_source_descriptor *cs_desc = + snd_usb_find_clock_source(chip->ctrl_intf, clock); + + if (!cs_desc) + return false; + + return (fmt->nr_rates == 1 && + (fmt->clock & 0xff) == cs_desc->bClockID && + (cs_desc->bmAttributes & 0x3) != UAC_CLOCK_SOURCE_TYPE_EXT); + } +} + static int __uac_clock_find_source(struct snd_usb_audio *chip, int entity_id, unsigned long *visited, bool validate) { @@ -577,7 +609,8 @@ static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface, validation: /* validate clock after rate change */ - if (!uac_clock_source_is_valid(chip, fmt->protocol, clock)) + if (!uac_clock_source_is_valid(chip, fmt->protocol, clock) && + !uac_clock_source_is_valid_quirk(chip, fmt, clock)) return -ENXIO; return 0; } _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel