[PATCH] ALSA: usb-audio: Add support for MOTU MicroBook IIc
Alexander Tsoy
alexander at tsoy.me
Sat Feb 29 16:18:15 CET 2020
MicroBook IIc operates in UAC2 mode by default. This patch addresses
several issues with it:
- MicroBook II and IIc shares the same USB ID. We can distinguish them
by interface class.
- MaxPacketsOnly attribute is erroneously set in endpoint descriptors.
As a result this card produces noise with all sample rates other than
96 KHz. This also causes issues like IOMMU page faults and other
problems with host controller.
- Sample rate changes takes more than 2 seconds for this device. Clock
validity request returns false during that period, so the clock validity
quirk is required.
Signed-off-by: Alexander Tsoy <alexander at tsoy.me>
---
sound/usb/clock.c | 59 ++++++++++++++++++++++++++++++++--------
sound/usb/pcm.c | 7 ++++-
sound/usb/quirks-table.h | 2 +-
sound/usb/quirks.c | 18 +++++++++++-
4 files changed, 72 insertions(+), 14 deletions(-)
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index a48313dfa967..b118cf97607f 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -151,16 +151,15 @@ static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_i
return ret;
}
-/*
- * Assume the clock is valid if clock source supports only one single sample
- * rate, the terminal is connected directly to it (there is no clock selector)
- * and clock type is internal. This is to deal with 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 source_id)
{
+ bool ret = false;
+ int count;
+ unsigned char data;
+ struct usb_device *dev = chip->dev;
+
if (fmt->protocol == UAC_VERSION_2) {
struct uac_clock_source_descriptor *cs_desc =
snd_usb_find_clock_source(chip->ctrl_intf, source_id);
@@ -168,13 +167,51 @@ static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
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);
+ /*
+ * Assume the clock is valid if clock source supports only one
+ * single sample rate, the terminal is connected directly to it
+ * (there is no clock selector) and clock type is internal.
+ * This is to deal with some Denon DJ controllers that always
+ * reports that clock is invalid.
+ */
+ if (fmt->nr_rates == 1 &&
+ (fmt->clock & 0xff) == cs_desc->bClockID &&
+ (cs_desc->bmAttributes & 0x3) !=
+ UAC_CLOCK_SOURCE_TYPE_EXT)
+ return true;
+ }
+
+ /*
+ * MOTU MicroBook IIc
+ * Sample rate changes takes more than 2 seconds for this device. Clock
+ * validity request returns false during that period.
+ */
+ if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
+ count = 0;
+
+ while ((!ret) && (count < 50)) {
+ int err;
+
+ msleep(100);
+
+ err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+ UAC2_CS_CONTROL_CLOCK_VALID << 8,
+ snd_usb_ctrl_intf(chip) | (source_id << 8),
+ &data, sizeof(data));
+ if (err < 0) {
+ dev_warn(&dev->dev,
+ "%s(): cannot get clock validity for id %d\n",
+ __func__, source_id);
+ return false;
+ }
+
+ ret = !!data;
+ count++;
+ }
}
- return false;
+ return ret;
}
static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index bd258f1ec2dd..a4e4064f9aee 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -357,7 +357,12 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
ep = 0x81;
ifnum = 1;
goto add_sync_ep_from_ifnum;
- case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
+ case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
+ /* MicroBook IIc */
+ if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
+ return 0;
+
+ /* MicroBook II */
ep = 0x84;
ifnum = 0;
goto add_sync_ep_from_ifnum;
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index d187aa6d50db..1c8719292eee 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3472,7 +3472,7 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
},
/* MOTU Microbook II */
{
- USB_DEVICE(0x07fd, 0x0004),
+ USB_DEVICE_VENDOR_SPEC(0x07fd, 0x0004),
.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
.vendor_name = "MOTU",
.product_name = "MicroBookII",
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 7f558f4b4520..a7bd32bd301c 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1316,7 +1316,15 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx 3 */
return snd_usb_axefx3_boot_quirk(dev);
case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
- return snd_usb_motu_microbookii_boot_quirk(dev);
+ /*
+ * For some reason interface 3 with vendor-spec class is
+ * detected on MicroBook IIc.
+ */
+ if (get_iface_desc(intf->altsetting)->bInterfaceClass ==
+ USB_CLASS_VENDOR_SPEC &&
+ get_iface_desc(intf->altsetting)->bInterfaceNumber < 3)
+ return snd_usb_motu_microbookii_boot_quirk(dev);
+ break;
}
return 0;
@@ -1754,5 +1762,13 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
else
fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
break;
+ case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook IIc */
+ /*
+ * MaxPacketsOnly attribute is erroneously set in endpoint
+ * descriptors. As a result this card produces noise with
+ * all sample rates other than 96 KHz.
+ */
+ fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX;
+ break;
}
}
--
2.24.1
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