[PATCH 5.17 114/219] ALSA: usb-audio: Increase max buffer size

Greg Kroah-Hartman
2022-04-18T12:27:09Z

From: Takashi Iwai <tiwai@suse.de>

[ Upstream commit fee2ec8cceb33b8886bc5894fb07e0b2e34148af ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/usb/pcm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 6a460225f2e3..37ee6df8b15a 100644
--- 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 =
--
2.35.1