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authorBin Meng <bmeng.cn@gmail.com>2017-09-18 06:40:48 -0700
committerMarek Vasut <marex@denx.de>2017-10-01 16:32:54 +0200
commitfa483b2c750f6ebdb5946f46b217aa3f9a449531 (patch)
tree3191c9474075f10efc94c2f308f803da55796f6b /drivers/usb
parentf51966bf7afe44151756e9a2432705bb56bc2007 (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')
-rw-r--r--drivers/usb/host/xhci.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 8aed4283ed..dfb188d5e4 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)