Hi,
On 12/26/2017 8:22 AM, Lipengcheng wrote:
> 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@xxxxxxxxxxxxx>
> ---
> 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
Can we rather make it 16?
I ran into similar issue on QCOM platform with DWC3 and with 8 requests also data loss
was observed. 16 requests (i.e. ~2msec) worked fine.
> #define UVC_MAX_REQUEST_SIZE 64
> #define UVC_MAX_EVENTS 4
>
> --
> 2.7.4
>
> N�����r��y���b�X��ǧv�^�){.n�+����{�����^n�r���z���h����&�� �G���h�(�階�ݢj"���m�����z�ޖ���f���h���~�mml==
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
