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usb: xhci: Program max burst size for endpoint

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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>
This commit is contained in:
Bin Meng 2017-09-18 06:40:48 -07:00 committed by Marek Vasut
parent f51966bf7a
commit fa483b2c75
1 changed files with 20 additions and 1 deletions
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21
drivers/usb/host/xhci.c
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@ -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)