diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-18 06:40:47 -0700 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2017-10-01 16:32:54 +0200 |
| commit | f51966bf7afe44151756e9a2432705bb56bc2007 (patch) | |
| tree | eefaa61400e609e077e12620c10239c051c4ff5a /include | |
| parent | 061895fbe57d29f50bb3c6c8609d56a668d1387d (diff) | |
usb: xhci: Honor endpoint's interval
USB endpoint reports the period between consecutive requests to send
or receive data as bInverval in its endpoint descriptor. So far this
is ignored by xHCI driver and the 'Interval' field in xHC's endpoint
context is always programmed to zero which means 1ms for low speed
or full speed , or 125us for high speed or super speed. We should
honor the interval by getting it from endpoint descriptor.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/ch9.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index 0ad4782a36..264c9712a3 100644 --- a/include/linux/usb/ch9.h +++ b/include/linux/usb/ch9.h @@ -418,6 +418,12 @@ struct __packed usb_class_report_descriptor { #define USB_ENDPOINT_XFER_INT 3 #define USB_ENDPOINT_MAX_ADJUSTABLE 0x80 +#define USB_ENDPOINT_MAXP_MASK 0x07ff +#define USB_EP_MAXP_MULT_SHIFT 11 +#define USB_EP_MAXP_MULT_MASK (3 << USB_EP_MAXP_MULT_SHIFT) +#define USB_EP_MAXP_MULT(m) \ + (((m) & USB_EP_MAXP_MULT_MASK) >> USB_EP_MAXP_MULT_SHIFT) + /* The USB 3.0 spec redefines bits 5:4 of bmAttributes as interrupt ep type. */ #define USB_ENDPOINT_INTRTYPE 0x30 #define USB_ENDPOINT_INTR_PERIODIC (0 << 4) @@ -625,6 +631,20 @@ static inline int usb_endpoint_maxp(const struct usb_endpoint_descriptor *epd) return __le16_to_cpu(get_unaligned(&epd->wMaxPacketSize)); } +/** + * usb_endpoint_maxp_mult - get endpoint's transactional opportunities + * @epd: endpoint to be checked + * + * Return @epd's wMaxPacketSize[12:11] + 1 + */ +static inline int +usb_endpoint_maxp_mult(const struct usb_endpoint_descriptor *epd) +{ + int maxp = __le16_to_cpu(epd->wMaxPacketSize); + + return USB_EP_MAXP_MULT(maxp) + 1; +} + static inline int usb_endpoint_interrupt_type( const struct usb_endpoint_descriptor *epd) { |