diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 25b0641e6b8c..f7e1c9f0d3ed 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -315,10 +315,10 @@ int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 	if (!params->info)
 		params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 	if (!params->fifo_size) {
-		if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
-		    snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
-                    snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
-                    snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {
+		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
+		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+		if (snd_mask_min(m) == snd_mask_max(m) &&
+                    snd_interval_min(i) == snd_interval_max(i)) {
 			changed = substream->ops->ioctl(substream,
 					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 			if (changed < 0)
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 6e89b8368d9a..aae50df06232 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1162,10 +1162,22 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
 		pipe = usb_sndintpipe(umidi->dev, ep_info->out_ep);
 	else
 		pipe = usb_sndbulkpipe(umidi->dev, ep_info->out_ep);
-	if (umidi->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */
-		ep->max_transfer = 4;
-	else
+	switch (umidi->usb_id) {
+	default:
 		ep->max_transfer = usb_maxpacket(umidi->dev, pipe, 1);
+		break;
+		/*
+		 * Various chips declare a packet size larger than 4 bytes, but
+		 * do not actually work with larger packets:
+		 */
+	case USB_ID(0x0a92, 0x1020): /* ESI M4U */
+	case USB_ID(0x1430, 0x474b): /* RedOctane GH MIDI INTERFACE */
+	case USB_ID(0x15ca, 0x0101): /* Textech USB Midi Cable */
+	case USB_ID(0x15ca, 0x1806): /* Textech USB Midi Cable */
+	case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
+		ep->max_transfer = 4;
+		break;
+	}
 	for (i = 0; i < OUTPUT_URBS; ++i) {
 		buffer = usb_buffer_alloc(umidi->dev,
 					  ep->max_transfer, GFP_KERNEL,