diff options
| author | Bin Meng | 2017-09-18 06:40:48 -0700 |
|---|---|---|
| committer | Marek Vasut | 2017-10-01 16:32:54 +0200 |
| commit | fa483b2c750f6ebdb5946f46b217aa3f9a449531 (patch) | |
| tree | 3191c9474075f10efc94c2f308f803da55796f6b /drivers/usb/host | |
| parent | f51966bf7afe44151756e9a2432705bb56bc2007 (diff) | |
usb: xhci: Program max burst size for endpoint
The 'Max Burst Size' indicates to the xHC the maximum number of
consecutive USB transactions that should be executed per scheduling
opportunity. This is a “zero-based” value, where 0 to 15 represents
burst sizes of 1 to 16, but at present this is always set to zero.
Let's program the required value according to real needs.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/xhci.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 8aed4283edb..dfb188d5e46 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -395,6 +395,22 @@ static u32 xhci_get_endpoint_mult(struct usb_device *udev, return ss_ep_comp_desc->bmAttributes; } +static u32 xhci_get_endpoint_max_burst(struct usb_device *udev, + struct usb_endpoint_descriptor *endpt_desc, + struct usb_ss_ep_comp_descriptor *ss_ep_comp_desc) +{ + /* Super speed and Plus have max burst in ep companion desc */ + if (udev->speed >= USB_SPEED_SUPER) + return ss_ep_comp_desc->bMaxBurst; + + if (udev->speed == USB_SPEED_HIGH && + (usb_endpoint_xfer_isoc(endpt_desc) || + usb_endpoint_xfer_int(endpt_desc))) + return usb_endpoint_maxp_mult(endpt_desc) - 1; + + return 0; +} + /* * Return the maximum endpoint service interval time (ESIT) payload. * Basically, this is the maxpacket size, multiplied by the burst size @@ -493,6 +509,7 @@ static int xhci_set_configuration(struct usb_device *udev) u32 max_esit_payload; unsigned int interval; unsigned int mult; + unsigned int max_burst; unsigned int avg_trb_len; out_ctx = virt_dev->out_ctx; @@ -545,6 +562,8 @@ static int xhci_set_configuration(struct usb_device *udev) interval = xhci_get_endpoint_interval(udev, endpt_desc); mult = xhci_get_endpoint_mult(udev, endpt_desc, ss_ep_comp_desc); + max_burst = xhci_get_endpoint_max_burst(udev, endpt_desc, + ss_ep_comp_desc); avg_trb_len = max_esit_payload; ep_index = xhci_get_ep_index(endpt_desc); @@ -570,7 +589,7 @@ static int xhci_set_configuration(struct usb_device *udev) (get_unaligned(&endpt_desc->wMaxPacketSize))); ep_ctx[ep_index]->ep_info2 |= - cpu_to_le32(((0 & MAX_BURST_MASK) << MAX_BURST_SHIFT) | + cpu_to_le32(MAX_BURST(max_burst) | ((3 & ERROR_COUNT_MASK) << ERROR_COUNT_SHIFT)); trb_64 = (uintptr_t) |