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usb: xhci-mtk: get the microframe boundary for ESIT 

Tune the boundary for FS/LS ESIT due to CS:
For ISOC out-ep, the controller starts transfer data after
the first SS; for others, the data is already transferred
before the last CS.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/49e5a269a47984f3126a70c3fb471b0c2874b8c2.1615170625.git.chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-03-08 10:51:52 +08:00 committed by Greg Kroah-Hartman
parent e19ee44a3d
commit 7c986fbc16
1 changed files with 19 additions and 5 deletions
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24
drivers/usb/host/xhci-mtk-sch.c
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@ -513,22 +513,35 @@ static void update_sch_tt(struct usb_device *udev,
list_del(&sch_ep->tt_endpoint);
}
static u32 get_esit_boundary(struct mu3h_sch_ep_info *sch_ep)
{
u32 boundary = sch_ep->esit;
if (sch_ep->sch_tt) { /* LS/FS with TT */
/* tune for CS */
if (sch_ep->ep_type != ISOC_OUT_EP)
boundary++;
else if (boundary > 1) /* normally esit >= 8 for FS/LS */
boundary--;
}
return boundary;
}
static int check_sch_bw(struct usb_device *udev,
struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
{
u32 offset;
u32 esit;
u32 min_bw;
u32 min_index;
u32 worst_bw;
u32 bw_boundary;
u32 esit_boundary;
u32 min_num_budget;
u32 min_cs_count;
bool tt_offset_ok = false;
int ret;
esit = sch_ep->esit;
/*
* Search through all possible schedule microframes.
* and find a microframe where its worst bandwidth is minimum.
@ -537,7 +550,8 @@ static int check_sch_bw(struct usb_device *udev,
min_index = 0;
min_cs_count = sch_ep->cs_count;
min_num_budget = sch_ep->num_budget_microframes;
for (offset = 0; offset < esit; offset++) {
esit_boundary = get_esit_boundary(sch_ep);
for (offset = 0; offset < sch_ep->esit; offset++) {
if (is_fs_or_ls(udev->speed)) {
ret = check_sch_tt(udev, sch_ep, offset);
if (ret)
@ -546,7 +560,7 @@ static int check_sch_bw(struct usb_device *udev,
tt_offset_ok = true;
}
if ((offset + sch_ep->num_budget_microframes) > sch_ep->esit)
if ((offset + sch_ep->num_budget_microframes) > esit_boundary)
break;
worst_bw = get_max_bw(sch_bw, sch_ep, offset);