diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index c495e72..05695b1 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1144,14 +1144,14 @@ static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
 #define MAUDIO_SET		0x01 /* parse device_setup */
 #define MAUDIO_SET_COMPATIBLE	0x80 /* use only "win-compatible" interfaces */
 #define MAUDIO_SET_DTS		0x02 /* enable DTS Digital Output */
-#define MAUDIO_SET_96K		0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
+#define MAUDIO_SET_96K		0x04 /* 48-96kHz rate if set, 8-48kHz otherwise */
 #define MAUDIO_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
 #define MAUDIO_SET_DI		0x10 /* enable Digital Input */
 #define MAUDIO_SET_MASK		0x1f /* bit mask for setup value */
-#define MAUDIO_SET_24B_48K_DI	 0x19 /* 24bits+48KHz+Digital Input */
-#define MAUDIO_SET_24B_48K_NOTDI 0x09 /* 24bits+48KHz+No Digital Input */
-#define MAUDIO_SET_16B_48K_DI	 0x11 /* 16bits+48KHz+Digital Input */
-#define MAUDIO_SET_16B_48K_NOTDI 0x01 /* 16bits+48KHz+No Digital Input */
+#define MAUDIO_SET_24B_48K_DI	 0x19 /* 24bits+48kHz+Digital Input */
+#define MAUDIO_SET_24B_48K_NOTDI 0x09 /* 24bits+48kHz+No Digital Input */
+#define MAUDIO_SET_16B_48K_DI	 0x11 /* 16bits+48kHz+Digital Input */
+#define MAUDIO_SET_16B_48K_NOTDI 0x01 /* 16bits+48kHz+No Digital Input */
 
 static int quattro_skip_setting_quirk(struct snd_usb_audio *chip,
 				      int iface, int altno)
@@ -1597,7 +1597,7 @@ void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
 
 	/*
 	 * M-Audio Fast Track C400/C600 - when packets are not skipped, real
-	 * world latency varies by approx. +/- 50 frames (at 96KHz) each time
+	 * world latency varies by approx. +/- 50 frames (at 96kHz) each time
 	 * the stream is (re)started. When skipping packets 16 at endpoint
 	 * start up, the real world latency is stable within +/- 1 frame (also
 	 * across power cycles).
@@ -1831,7 +1831,7 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
 		/*
 		 * MaxPacketsOnly attribute is erroneously set in endpoint
 		 * descriptors. As a result this card produces noise with
-		 * all sample rates other than 96 KHz.
+		 * all sample rates other than 96 kHz.
 		 */
 		fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX;
 		break;