ALSA: usb-audio: Increase max buffer size

The current limit of max buffer size 1MB seems too small for modern
devices with lots of channels and high sample rates.
Let's make bigger, 4MB.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220407212740.17920-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 6a460225f2e38952f9fc8e9df4bbfe646669e776..37ee6df8b15a71872989014d0ee35f22b85fbc3d 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -659,7 +659,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 #define hwc_debug(fmt, args...) do { } while(0)
 #endif
 
-#define MAX_BUFFER_BYTES       (1024 * 1024)
+#define MAX_BUFFER_BYTES       (4 * 1024 * 1024)
 #define MAX_PERIOD_BYTES       (512 * 1024)
 
 static const struct snd_pcm_hardware snd_usb_hardware =