Thank you so much Alexander! I used latest Kernel and patched as you suggested. The Device is working now giving sound on all 4 channels, even though dmesg still shows the error message as you can see here:
uname -a: Linux tobias-V130 5.5.2 #1 SMP Thu Feb 6 09:41:57 CET 2020 x86_64 x86_64 x86_64 GNU/Linux
dmesg: [ 62.918777] usb 1-1.3: new high-speed USB device number 6 using xhci_hcd [ 62.939293] usb 1-1.3: New USB device found, idVendor=15e4, idProduct=8004, bcdDevice=11.10 [ 62.939295] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 62.939297] usb 1-1.3: Product: DENON DJ MC7000 [ 62.939298] usb 1-1.3: Manufacturer: DENON DJ [ 62.939299] usb 1-1.3: SerialNumber: 201603 [ 62.942232] usb 1-1.3: clock source 65 is not valid, cannot use [ 62.943998] usb 1-1.3: clock source 65 is not valid, cannot use [ 63.013306] usb 1-1.3: clock source 65 is not valid, cannot use [ 63.028912] usb 1-1.3: clock source 65 is not valid, cannot use [ 63.029675] usb 1-1.3: clock source 65 is not valid, cannot use [ 63.037813] usb 1-1.3: clock source 65 is not valid, cannot use [ 63.063865] usb 1-1.3: clock source 65 is not valid, cannot use
I checked in file /sound/usb/clock.c that within functions
static int __uac_clock_find_source static int __uac3_clock_find_source
there is another check that possibly gives the warning.
Maybe the warning "cannot use" should not be displayed when a Denon Audio device is attached as it is misleading.
Thanks a lot for your next patch that I would like to test. Tobias
Am 05.02.20 um 20:07 schrieb Alexander Tsoy:
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))