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usb: gadget: composite: Set recommended BESL values 

Set the recommended BESL deep and baseline values based on the gadget's
configuration parameters to the extended BOS descriptor. This feature
helps to optimize power savings by maximizing the opportunity for longer
L1 residency time.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Thinh Nguyen 2019-08-19 18:36:12 -07:00 committed by Felipe Balbi
parent 54fb5ba647
commit cca3854010
2 changed files with 28 additions and 12 deletions
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38
drivers/usb/gadget/composite.c
View File

@ -612,6 +612,7 @@ static int bos_desc(struct usb_composite_dev *cdev)
struct usb_ext_cap_descriptor *usb_ext;
struct usb_dcd_config_params dcd_config_params;
struct usb_bos_descriptor *bos = cdev->req->buf;
unsigned int besl = 0;
bos->bLength = USB_DT_BOS_SIZE;
bos->bDescriptorType = USB_DT_BOS;
@ -619,6 +620,29 @@ static int bos_desc(struct usb_composite_dev *cdev)
bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
bos->bNumDeviceCaps = 0;
/* Get Controller configuration */
if (cdev->gadget->ops->get_config_params) {
cdev->gadget->ops->get_config_params(cdev->gadget,
&dcd_config_params);
} else {
dcd_config_params.besl_baseline =
USB_DEFAULT_BESL_UNSPECIFIED;
dcd_config_params.besl_deep =
USB_DEFAULT_BESL_UNSPECIFIED;
dcd_config_params.bU1devExitLat =
USB_DEFAULT_U1_DEV_EXIT_LAT;
dcd_config_params.bU2DevExitLat =
cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
}
if (dcd_config_params.besl_baseline != USB_DEFAULT_BESL_UNSPECIFIED)
besl = USB_BESL_BASELINE_VALID |
USB_SET_BESL_BASELINE(dcd_config_params.besl_baseline);
if (dcd_config_params.besl_deep != USB_DEFAULT_BESL_UNSPECIFIED)
besl |= USB_BESL_DEEP_VALID |
USB_SET_BESL_DEEP(dcd_config_params.besl_deep);
/*
* A SuperSpeed device shall include the USB2.0 extension descriptor
* and shall support LPM when operating in USB2.0 HS mode.
@ -629,7 +653,8 @@ static int bos_desc(struct usb_composite_dev *cdev)
usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT |
USB_BESL_SUPPORT | besl);
/*
* The Superspeed USB Capability descriptor shall be implemented by all
@ -650,17 +675,6 @@ static int bos_desc(struct usb_composite_dev *cdev)
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(cdev->gadget,
&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;
}

2
include/uapi/linux/usb/ch9.h
View File

@ -894,6 +894,8 @@ struct usb_ext_cap_descriptor { /* Link Power Management */
#define USB_BESL_SUPPORT (1 << 2) /* supports BESL */
#define USB_BESL_BASELINE_VALID (1 << 3) /* Baseline BESL valid*/
#define USB_BESL_DEEP_VALID (1 << 4) /* Deep BESL valid */
#define USB_SET_BESL_BASELINE(p) (((p) & 0xf) << 8)
#define USB_SET_BESL_DEEP(p) (((p) & 0xf) << 12)
#define USB_GET_BESL_BASELINE(p) (((p) & (0xf << 8)) >> 8)
#define USB_GET_BESL_DEEP(p) (((p) & (0xf << 12)) >> 12)
} __attribute__((packed));