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| author | John Youn <johnyoun@synopsys.com> | 2017-04-28 12:55:20 +0400 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-06-02 11:22:32 +0300 |
| commit | a9548c55295a4268f9187e1ec93264a0682fa745 (patch) | |
| tree | 5ea14d14aa8845ffb1507bd2731a4cd62aa55c3d /drivers/usb | |
| parent | 0b67a6be14be5fb050b0358022c497d0619ebc40 (diff) | |
| download | linux-a9548c55295a4268f9187e1ec93264a0682fa745.tar.gz linux-a9548c55295a4268f9187e1ec93264a0682fa745.tar.bz2 linux-a9548c55295a4268f9187e1ec93264a0682fa745.zip | |
usb: gadget: Allow a non-SuperSpeed gadget to support LPM
This commit allows a gadget that does not support SuperSpeed to indicate
that it supports LPM. It does this by setting the 'lpm_capable' flag in
the gadget structure.
If a gadget sets this, the composite gadget framework will set the
bcdUSB to 0x0201 to indicate that this supports BOS descriptors, and
also return a USB 2.0 Extension descriptor as part of the BOS descriptor
set.
See USB 2.0 LPM ECN Section 3.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Sevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/composite.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index abec93ab81ee..d62f53d7f418 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1608,7 +1608,10 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) cdev->desc.bcdUSB = cpu_to_le16(0x0210); } } else { - cdev->desc.bcdUSB = cpu_to_le16(0x0200); + if (gadget->lpm_capable) + cdev->desc.bcdUSB = cpu_to_le16(0x0201); + else + cdev->desc.bcdUSB = cpu_to_le16(0x0200); } value = min(w_length, (u16) sizeof cdev->desc); @@ -1639,7 +1642,8 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) value = min(w_length, (u16) value); break; case USB_DT_BOS: - if (gadget_is_superspeed(gadget)) { + if (gadget_is_superspeed(gadget) || + gadget->lpm_capable) { value = bos_desc(cdev); value = min(w_length, (u16) value); } |