linux-kernel - [PATCH] usb: gadget: uvc:change the UVC_NUM

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Message-ID: <637796ED17F7774FB27D6AAE3C6951584B38D3F6@dggeml508-mbx.china.huawei.com>
Date:   Tue, 26 Dec 2017 02:52:08 +0000
From:   Lipengcheng <lpc.li@...ilicon.com>
To:     "balbi@...nel.org" <balbi@...nel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Lipengcheng <lpc.li@...ilicon.com>
Subject: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

The value is 4, it can cache four descriptors. When streaming_interval = 1,
it can tolerate 500us. Some busy scenes, it may be more than 500us because
cpu scheduling is not timely. There will have some problems. It is better
set to eight.

Signed-off-by: Pengcheng Li <lpc.li@...ilicon.com>
---
 drivers/usb/gadget/function/uvc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
index a64e07e..901487e 100644
--- a/drivers/usb/gadget/function/uvc.h
+++ b/drivers/usb/gadget/function/uvc.h
@@ -90,7 +90,7 @@ extern unsigned int uvc_gadget_trace_param;
  * Driver specific constants
  */

-#define UVC_NUM_REQUESTS           4
+#define UVC_NUM_REQUESTS           8
 #define UVC_MAX_REQUEST_SIZE           64
 #define UVC_MAX_EVENTS             4

--
2.7.4