usb: common: add function to get interval expressed in us unit
Add a new function to convert bInterval into the time expressed in 1us unit. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Link: https://lore.kernel.org/r/25c8a09b055f716c1e5bf11fea72c3418f844482.1615170625.git.chunfeng.yun@mediatek.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -165,6 +165,47 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
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}
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}
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EXPORT_SYMBOL_GPL(usb_get_dr_mode);
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EXPORT_SYMBOL_GPL(usb_get_dr_mode);
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/**
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* usb_decode_interval - Decode bInterval into the time expressed in 1us unit
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* @epd: The descriptor of the endpoint
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* @speed: The speed that the endpoint works as
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*
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* Function returns the interval expressed in 1us unit for servicing
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* endpoint for data transfers.
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*/
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unsigned int usb_decode_interval(const struct usb_endpoint_descriptor *epd,
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enum usb_device_speed speed)
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{
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unsigned int interval = 0;
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switch (usb_endpoint_type(epd)) {
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case USB_ENDPOINT_XFER_CONTROL:
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/* uframes per NAK */
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if (speed == USB_SPEED_HIGH)
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interval = epd->bInterval;
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break;
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case USB_ENDPOINT_XFER_ISOC:
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interval = 1 << (epd->bInterval - 1);
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break;
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case USB_ENDPOINT_XFER_BULK:
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/* uframes per NAK */
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if (speed == USB_SPEED_HIGH && usb_endpoint_dir_out(epd))
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interval = epd->bInterval;
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break;
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case USB_ENDPOINT_XFER_INT:
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if (speed >= USB_SPEED_HIGH)
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interval = 1 << (epd->bInterval - 1);
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else
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interval = epd->bInterval;
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break;
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}
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interval *= (speed >= USB_SPEED_HIGH) ? 125 : 1000;
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return interval;
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}
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EXPORT_SYMBOL_GPL(usb_decode_interval);
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#ifdef CONFIG_OF
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#ifdef CONFIG_OF
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/**
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/**
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* of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
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* of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
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@ -157,38 +157,25 @@ static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
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switch (usb_endpoint_type(desc)) {
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switch (usb_endpoint_type(desc)) {
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case USB_ENDPOINT_XFER_CONTROL:
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case USB_ENDPOINT_XFER_CONTROL:
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type = "Ctrl";
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type = "Ctrl";
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if (speed == USB_SPEED_HIGH) /* uframes per NAK */
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interval = desc->bInterval;
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else
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interval = 0;
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dir = 'B'; /* ctrl is bidirectional */
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dir = 'B'; /* ctrl is bidirectional */
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break;
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break;
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case USB_ENDPOINT_XFER_ISOC:
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case USB_ENDPOINT_XFER_ISOC:
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type = "Isoc";
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type = "Isoc";
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interval = 1 << (desc->bInterval - 1);
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break;
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break;
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case USB_ENDPOINT_XFER_BULK:
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case USB_ENDPOINT_XFER_BULK:
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type = "Bulk";
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type = "Bulk";
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if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
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interval = desc->bInterval;
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else
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interval = 0;
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break;
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break;
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case USB_ENDPOINT_XFER_INT:
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case USB_ENDPOINT_XFER_INT:
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type = "Int.";
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type = "Int.";
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if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER)
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interval = 1 << (desc->bInterval - 1);
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else
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interval = desc->bInterval;
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break;
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break;
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default: /* "can't happen" */
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default: /* "can't happen" */
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return start;
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return start;
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}
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}
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interval *= (speed == USB_SPEED_HIGH ||
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speed >= USB_SPEED_SUPER) ? 125 : 1000;
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interval = usb_decode_interval(desc, speed);
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if (interval % 1000)
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if (interval % 1000) {
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unit = 'u';
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unit = 'u';
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else {
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} else {
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unit = 'm';
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unit = 'm';
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interval /= 1000;
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interval /= 1000;
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}
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}
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@ -84,40 +84,13 @@ static ssize_t interval_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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char *buf)
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{
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{
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struct ep_device *ep = to_ep_device(dev);
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struct ep_device *ep = to_ep_device(dev);
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unsigned int interval;
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char unit;
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char unit;
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unsigned interval = 0;
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unsigned in;
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in = (ep->desc->bEndpointAddress & USB_DIR_IN);
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interval = usb_decode_interval(ep->desc, ep->udev->speed);
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if (interval % 1000) {
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switch (usb_endpoint_type(ep->desc)) {
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case USB_ENDPOINT_XFER_CONTROL:
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if (ep->udev->speed == USB_SPEED_HIGH)
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/* uframes per NAK */
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interval = ep->desc->bInterval;
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break;
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case USB_ENDPOINT_XFER_ISOC:
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interval = 1 << (ep->desc->bInterval - 1);
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break;
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case USB_ENDPOINT_XFER_BULK:
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if (ep->udev->speed == USB_SPEED_HIGH && !in)
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/* uframes per NAK */
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interval = ep->desc->bInterval;
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break;
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case USB_ENDPOINT_XFER_INT:
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if (ep->udev->speed == USB_SPEED_HIGH)
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interval = 1 << (ep->desc->bInterval - 1);
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else
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interval = ep->desc->bInterval;
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break;
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}
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interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
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if (interval % 1000)
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unit = 'u';
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unit = 'u';
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else {
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} else {
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unit = 'm';
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unit = 'm';
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interval /= 1000;
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interval /= 1000;
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}
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}
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@ -90,6 +90,9 @@ extern enum usb_ssp_rate usb_get_maximum_ssp_rate(struct device *dev);
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*/
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*/
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extern const char *usb_state_string(enum usb_device_state state);
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extern const char *usb_state_string(enum usb_device_state state);
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unsigned int usb_decode_interval(const struct usb_endpoint_descriptor *epd,
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enum usb_device_speed speed);
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#ifdef CONFIG_TRACING
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#ifdef CONFIG_TRACING
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/**
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/**
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* usb_decode_ctrl - Returns human readable representation of control request.
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* usb_decode_ctrl - Returns human readable representation of control request.
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