diff options
| author | John Youn <John.Youn@synopsys.com> | 2016-02-06 04:05:53 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@kernel.org> | 2016-03-04 16:14:23 +0300 |
| commit | f228a8de242a85659d9c86f2b9ff862775f015c2 (patch) | |
| tree | 571c11dbf5d6d02971c5ccddedae1be2ef979028 /drivers/usb/gadget/composite.c | |
| parent | 1a85329171094951956a37acc8abb7e51c1e742e (diff) | |
| download | linux-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.c | 42 |
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); } |