1 files changed, 25 insertions, 0 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index a8ef2cbcc03b..c7b902358b7b 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -3291,6 +3291,25 @@ static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
 }
 
+/*
+ * C-Media CM6206 is based on CM106 with two additional
+ * registers that are not documented in the data sheet.
+ * Values here are chosen based on sniffing USB traffic
+ * under Windows.
+ */
+static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
+{
+        int err, reg;
+        int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
+
+        for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
+                err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
+                if (err < 0)
+                        return err;
+        }
+
+        return err;
+}
 
 /*
  * Setup quirks
@@ -3577,6 +3596,12 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
                         goto __err_val;
         }
 
+        /* C-Media CM6206 / CM106-Like Sound Device */
+        if (id == USB_ID(0x0d8c, 0x0102)) {
+                if (snd_usb_cm6206_boot_quirk(dev) < 0)
+                        goto __err_val;
+        }
+
         /*
          * found a config.  now register to ALSA
          */