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Commit f228a8de authored by John Youn's avatar John Youn Committed by Felipe Balbi
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usb: gadget: composite: Return SSP Dev Cap descriptor 



If a gadget supports SuperSpeedPlus or higher speeds, return a
SuperSpeedPlus USB Device Capability descriptor.

Currently this implementation returns a fixed descriptor with typical
values set.

Signed-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@kernel.org>
parent 1a853291

drivers/usb/gadget/composite.c

+42 −0
Original line number Diff line number Diff line
@@ -597,6 +597,48 @@ static int bos_desc(struct usb_composite_dev *cdev) 
	ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;

	ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;



	/* The SuperSpeedPlus USB Device Capability descriptor */

	if (gadget_is_superspeed_plus(cdev->gadget)) {

		struct usb_ssp_cap_descriptor *ssp_cap;



		ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);

		bos->bNumDeviceCaps++;



		/*

		 * Report typical values.

		 */



		le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(1));

		ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(1);

		ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;

		ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;



		/* SSAC = 1 (2 attributes) */

		ssp_cap->bmAttributes = cpu_to_le32(1);



		/* Min RX/TX Lane Count = 1 */

		ssp_cap->wFunctionalitySupport = (1 << 8) | (1 << 12);



		/*

		 * bmSublinkSpeedAttr[0]:

		 *   ST  = Symmetric, RX

		 *   LSE =  3 (Gbps)

		 *   LP  =  1 (SuperSpeedPlus)

		 *   LSM = 10 (10 Gbps)

		 */

		ssp_cap->bmSublinkSpeedAttr[0] =

			(3 << 4) | (1 << 14) | (0xa << 16);

		/*

		 * bmSublinkSpeedAttr[1] =

		 *   ST  = Symmetric, TX

		 *   LSE =  3 (Gbps)

		 *   LP  =  1 (SuperSpeedPlus)

		 *   LSM = 10 (10 Gbps)

		 */

		ssp_cap->bmSublinkSpeedAttr[1] =

			(3 << 4) | (1 << 14) | (0xa << 16) | (1 << 7);

	}



	return le16_to_cpu(bos->wTotalLength);

}