add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/sound/usb/clock.c
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@@ -1,20 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *   Clock domain and sample rate management functions
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- *
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- *   This program is free software; you can redistribute it and/or modify
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- *   it under the terms of the GNU General Public License as published by
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- *   the Free Software Foundation; either version 2 of the License, or
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- *   (at your option) any later version.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
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- *
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- *   You should have received a copy of the GNU General Public License
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- *   along with this program; if not, write to the Free Software
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- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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- *
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  */
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 #include <linux/bitops.h>
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@@ -165,16 +151,15 @@
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 	return ret;
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 }
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-/*
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- * Assume the clock is valid if clock source supports only one single sample
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- * rate, the terminal is connected directly to it (there is no clock selector)
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- * and clock type is internal. This is to deal with some Denon DJ controllers
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- * that always reports that clock is invalid.
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- */
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 static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
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 					    struct audioformat *fmt,
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 					    int source_id)
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 {
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+	bool ret = false;
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+	int count;
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+	unsigned char data;
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+	struct usb_device *dev = chip->dev;
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+
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 	if (fmt->protocol == UAC_VERSION_2) {
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 		struct uac_clock_source_descriptor *cs_desc =
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 			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
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@@ -182,13 +167,51 @@
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 		if (!cs_desc)
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 			return false;
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-		return (fmt->nr_rates == 1 &&
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-			(fmt->clock & 0xff) == cs_desc->bClockID &&
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-			(cs_desc->bmAttributes & 0x3) !=
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-				UAC_CLOCK_SOURCE_TYPE_EXT);
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+		/*
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+		 * Assume the clock is valid if clock source supports only one
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+		 * single sample rate, the terminal is connected directly to it
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+		 * (there is no clock selector) and clock type is internal.
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+		 * This is to deal with some Denon DJ controllers that always
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+		 * reports that clock is invalid.
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+		 */
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+		if (fmt->nr_rates == 1 &&
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+		    (fmt->clock & 0xff) == cs_desc->bClockID &&
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+		    (cs_desc->bmAttributes & 0x3) !=
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+				UAC_CLOCK_SOURCE_TYPE_EXT)
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+			return true;
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 	}
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-	return false;
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+	/*
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+	 * MOTU MicroBook IIc
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+	 * Sample rate changes takes more than 2 seconds for this device. Clock
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+	 * validity request returns false during that period.
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+	 */
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+	if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
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+		count = 0;
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+
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+		while ((!ret) && (count < 50)) {
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+			int err;
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+
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+			msleep(100);
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+
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+			err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
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+					      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
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+					      UAC2_CS_CONTROL_CLOCK_VALID << 8,
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+					      snd_usb_ctrl_intf(chip) | (source_id << 8),
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+					      &data, sizeof(data));
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+			if (err < 0) {
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+				dev_warn(&dev->dev,
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+					 "%s(): cannot get clock validity for id %d\n",
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+					   __func__, source_id);
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+				return false;
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+			}
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+
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+			ret = !!data;
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+			count++;
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+		}
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+	}
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+
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+	return ret;
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 }
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 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
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@@ -641,8 +664,13 @@
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 	 * interface is active. */
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 	if (rate != prev_rate) {
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 		usb_set_interface(dev, iface, 0);
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+
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+		snd_vendor_set_interface(dev, alts, iface, 0);
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+
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 		snd_usb_set_interface_quirk(dev);
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 		usb_set_interface(dev, iface, fmt->altsetting);
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+
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+		snd_vendor_set_interface(dev, alts, iface, fmt->altsetting);
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 		snd_usb_set_interface_quirk(dev);
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 	}
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@@ -669,7 +697,7 @@
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 			else
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 				return 0;
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 		}
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-	/* fall through */
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+		fallthrough;
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 	case UAC_VERSION_2:
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 		return set_sample_rate_v2v3(chip, iface, alts, fmt, rate);
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 	}