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authorJohn Youn <John.Youn@synopsys.com>2016-02-06 04:05:53 +0300
committerFelipe Balbi <balbi@kernel.org>2016-03-04 16:14:23 +0300
commitf228a8de242a85659d9c86f2b9ff862775f015c2 (patch)
tree571c11dbf5d6d02971c5ccddedae1be2ef979028 /drivers/usb/gadget/composite.c
parent1a85329171094951956a37acc8abb7e51c1e742e (diff)
downloadlinux-f228a8de242a85659d9c86f2b9ff862775f015c2.tar.xz
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: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r--drivers/usb/gadget/composite.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index ce5dbc59311d..11d243349ebf 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -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);
}