diff options
| author | Azhar Shaikh <azhars@codeaurora.org> | 2015-07-02 18:11:33 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:02:58 -0700 |
| commit | a99d4a5017ec38797d14dd9a3d091d363055549e (patch) | |
| tree | 61c88b521e83bf19fe1cf7abe816945f5800bdb1 | |
| parent | 37648e8eb6e3ae452be349025797e1e1881d1710 (diff) | |
usb: gadget: Disable L1 LPM capability
Disable USB L1 LPM functionality on MSM platforms by setting the
USB version as 0x200 for all High Speed Devices.
Add a module param, which when enabled will set the USB version as
0x210. Module param can be enabled as
echo Y > /sys/module/libcomposite/parameters/enable_l1_for_hs
Change-Id: I781a237b44e542c6089af36b7ce0a0665d3cd440
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>
| -rw-r--r-- | drivers/usb/gadget/composite.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 7f2843899c41..50be4fd1d11e 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -27,6 +27,10 @@ #define SSUSB_GADGET_VBUS_DRAW_UNITS 8 #define HSUSB_GADGET_VBUS_DRAW_UNITS 2 +static bool enable_l1_for_hs; +module_param(enable_l1_for_hs, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(enable_l1_for_hs, "Enable support for L1 LPM for HS devices"); + /** * struct usb_os_string - represents OS String to be reported by a gadget * @bLength: total length of the entire descritor, always 0x12 @@ -1625,8 +1629,11 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) if (gadget->speed >= USB_SPEED_SUPER) { cdev->desc.bcdUSB = cpu_to_le16(0x0300); cdev->desc.bMaxPacketSize0 = 9; - } else { + } else if (gadget->l1_supported || + enable_l1_for_hs) { cdev->desc.bcdUSB = cpu_to_le16(0x0210); + DBG(cdev, + "Config HS device with LPM(L1)\n"); } } else if (gadget->l1_supported) { cdev->desc.bcdUSB = cpu_to_le16(0x0210); @@ -1661,8 +1668,9 @@ 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) || - gadget->l1_supported) { + if ((gadget_is_superspeed(gadget) && + (gadget->speed >= USB_SPEED_SUPER)) + || gadget->l1_supported) { value = bos_desc(cdev); value = min(w_length, (u16) value); } |