linux-kernel - [PATCH] ALSA: usb-audio: retry clock validate when it takes some times

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Date: Thu,  1 Feb 2024 15:06:09 +0800
From: vincenttew <vincenttew@...gle.com>
To: perex@...ex.cz, tiwai@...e.com, vincenttew@...gle.com, 
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Cc: alexander@...y.me
Subject: [PATCH] ALSA: usb-audio: retry clock validate when it takes some times

Behringer UMC202HD and UMC404HD take some times to validate the clock
source. To prevent more DAC have the same delay which return the false
in the first time, remove the USB id check to have a chance to retry the
clock validate.

Signed-off-by: vincenttew <vincenttew@...gle.com>
---
 sound/usb/clock.c | 43 ++++++++++++++++++-------------------------
 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index b118cf97607f..16d7a456dd10 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -181,34 +181,27 @@ static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
 			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;
+	count = 0;
 
-		while ((!ret) && (count < 50)) {
-			int err;
+	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++;
+		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 ret;
-- 
2.43.0.429.g432eaa2c6b-goog