The commit 40c73b30546e ("usb: gadget: f_uac2: add adaptive sync
support for capture") supported 'c_sync' for configfs file.
To configure the 'c_sync' via legacy audio driver, add c_sync
parameter. And then, we can change the 'c_sync' to 'ADAPTIVE' like
below:
modprobe g_audio c_sync=8
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/usb/gadget/legacy/audio.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/gadget/legacy/audio.c b/drivers/usb/gadget/legacy/audio.c
index a748ed0842e8..f9765bf63006 100644
--- a/drivers/usb/gadget/legacy/audio.c
+++ b/drivers/usb/gadget/legacy/audio.c
@@ -49,6 +49,11 @@ MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
static int c_ssize = UAC2_DEF_CSSIZE;
module_param(c_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
+
+/* Capture Default ASYNC */
+static int c_sync = UAC2_DEF_CSYNC;
+module_param(c_sync, uint, S_IRUGO);
+MODULE_PARM_DESC(c_sync, "Capture Sync Type");
#else
#ifndef CONFIG_GADGET_UAC1_LEGACY
#include "u_uac1.h"
@@ -268,6 +273,8 @@ static int audio_bind(struct usb_composite_dev *cdev)
uac2_opts->c_chmask = c_chmask;
uac2_opts->c_srate = c_srate;
uac2_opts->c_ssize = c_ssize;
+ if (c_sync == USB_ENDPOINT_SYNC_ADAPTIVE)
+ uac2_opts->c_sync = c_sync;
uac2_opts->req_number = UAC2_DEF_REQ_NUM;
#else
#ifndef CONFIG_GADGET_UAC1_LEGACY
--
2.25.1
