[alsa-devel] USB Audio Interface / Denon MC7000 and MC8000 controller
Alexander Tsoy
alexander at tsoy.me
Thu Feb 6 23:09:33 CET 2020
В Чт, 06/02/2020 в 11:06 +0100, Tobias пишет:
> 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
Yes, this is expected.
>
> 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.
Please try the patch below. I've dropped UAC3 support and changed
__uac_clock_find_source() and __uac3_clock_find_source() to print
errors only in debug mode, as we make the final decision about clock
validity in set_sample_rate_v2v3().
Dear Takashi, what do you think about this approach. Is it acceptable?
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 018b1ecb5404..e978b46efc85 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -197,6 +197,32 @@ 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 a terminal is connected directly to it
+ * (there is no clock selector). This is needed for some Denon DJ controllers,
+ * that always reports 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_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);
+ }
+
+ return false;
+}
+
static int __uac_clock_find_source(struct snd_usb_audio *chip, int entity_id,
unsigned long *visited, bool validate)
{
@@ -219,7 +245,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, int entity_id,
entity_id = source->bClockID;
if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_2,
entity_id)) {
- usb_audio_err(chip,
+ usb_audio_dbg(chip,
"clock source %d is not valid, cannot use\n",
entity_id);
return -ENXIO;
@@ -309,7 +335,7 @@ static int __uac3_clock_find_source(struct snd_usb_audio *chip, int entity_id,
entity_id = source->bClockID;
if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_3,
entity_id)) {
- usb_audio_err(chip,
+ usb_audio_dbg(chip,
"clock source %d is not valid, cannot use\n",
entity_id);
return -ENXIO;
@@ -577,7 +603,11 @@ 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))
+ usb_audio_err(chip,
+ "clock source %d is not valid, cannot use\n",
+ entity_id);
return -ENXIO;
return 0;
}
>
> 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))
> > return -ENXIO;
> > return 0;
> > }
> >
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