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usb: gadget: Add link power management support

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Link Power Management (a.k.a. L1) is similar to the existing usb bus
suspend/resume/remote-wakeup, but has transitional latencies of tens
of microseconds between power states (instead of three to greater than
20 millisecond latencies of the USB 2.0 suspend/resume).

Change-Id: I8ae493534702e658c24f384a6b705b08e9ea9d05
Signed-off-by: Shimrit Malichi <smalichi@codeaurora.org>
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>
This commit is contained in:
Shimrit Malichi 2013-06-20 19:04:28 +03:00 • committed by David Keitel
parent f67850e9f0
commit 37648e8eb6
2 changed files with 37 additions and 29 deletions
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65
drivers/usb/gadget/composite.c
View file

@ -653,7 +653,8 @@ static int bos_desc(struct usb_composite_dev *cdev)
/*
* A SuperSpeed device shall include the USB2.0 extension descriptor
* and shall support LPM when operating in USB2.0 HS mode.
* and shall support LPM when operating in USB2.0 HS mode, as well as
* a HS device when operating in USB2.1 HS mode.
*/
usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
@ -663,33 +664,37 @@ static int bos_desc(struct usb_composite_dev *cdev)
usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT);
/*
* The Superspeed USB Capability descriptor shall be implemented by all
* SuperSpeed devices.
*/
ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
ss_cap->bmAttributes = 0; /* LTM is not supported yet */
ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
USB_FULL_SPEED_OPERATION |
USB_HIGH_SPEED_OPERATION |
USB_5GBPS_OPERATION);
ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
if (gadget_is_superspeed(cdev->gadget)) {
/*
* The Superspeed USB Capability descriptor shall be
* implemented by all SuperSpeed devices.
*/
ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
ss_cap->bmAttributes = 0; /* LTM is not supported yet */
ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
USB_FULL_SPEED_OPERATION |
USB_HIGH_SPEED_OPERATION |
USB_5GBPS_OPERATION);
ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
/* Get Controller configuration */
if (cdev->gadget->ops->get_config_params)
cdev->gadget->ops->get_config_params(&dcd_config_params);
else {
dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;
dcd_config_params.bU2DevExitLat =
cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
/* Get Controller configuration */
if (cdev->gadget->ops->get_config_params)
cdev->gadget->ops->get_config_params
(&dcd_config_params);
else {
dcd_config_params.bU1devExitLat =
USB_DEFAULT_U1_DEV_EXIT_LAT;
dcd_config_params.bU2DevExitLat =
cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
}
ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
}
ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
return le16_to_cpu(bos->wTotalLength);
}
@ -1623,8 +1628,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
} else {
cdev->desc.bcdUSB = cpu_to_le16(0x0210);
}
} else {
cdev->desc.bcdUSB = cpu_to_le16(0x0200);
} else if (gadget->l1_supported) {
cdev->desc.bcdUSB = cpu_to_le16(0x0210);
DBG(cdev, "Config HS device with LPM(L1)\n");
}
value = min(w_length, (u16) sizeof cdev->desc);
@ -1655,7 +1661,8 @@ 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->l1_supported) {
value = bos_desc(cdev);
value = min(w_length, (u16) value);
}

1
include/linux/usb/gadget.h
View file

@ -647,6 +647,7 @@ struct usb_gadget {
unsigned is_selfpowered:1;
unsigned deactivated:1;
unsigned connected:1;
bool l1_supported;
};
#define work_to_gadget(w) (container_of((w), struct usb_gadget, work))