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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>
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1 changed files with 19 additions and 5 deletions
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@ -513,22 +513,35 @@ static void update_sch_tt(struct usb_device *udev,
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list_del(&sch_ep->tt_endpoint);
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}
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static u32 get_esit_boundary(struct mu3h_sch_ep_info *sch_ep)
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{
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u32 boundary = sch_ep->esit;
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if (sch_ep->sch_tt) { /* LS/FS with TT */
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/* tune for CS */
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if (sch_ep->ep_type != ISOC_OUT_EP)
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boundary++;
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else if (boundary > 1) /* normally esit >= 8 for FS/LS */
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boundary--;
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}
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return boundary;
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}
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static int check_sch_bw(struct usb_device *udev,
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struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
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{
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u32 offset;
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u32 esit;
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u32 min_bw;
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u32 min_index;
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u32 worst_bw;
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u32 bw_boundary;
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u32 esit_boundary;
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u32 min_num_budget;
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u32 min_cs_count;
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bool tt_offset_ok = false;
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int ret;
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esit = sch_ep->esit;
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/*
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* Search through all possible schedule microframes.
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* and find a microframe where its worst bandwidth is minimum.
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@ -537,7 +550,8 @@ static int check_sch_bw(struct usb_device *udev,
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min_index = 0;
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min_cs_count = sch_ep->cs_count;
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min_num_budget = sch_ep->num_budget_microframes;
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for (offset = 0; offset < esit; offset++) {
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esit_boundary = get_esit_boundary(sch_ep);
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for (offset = 0; offset < sch_ep->esit; offset++) {
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if (is_fs_or_ls(udev->speed)) {
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ret = check_sch_tt(udev, sch_ep, offset);
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if (ret)
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@ -546,7 +560,7 @@ static int check_sch_bw(struct usb_device *udev,
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tt_offset_ok = true;
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}
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if ((offset + sch_ep->num_budget_microframes) > sch_ep->esit)
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if ((offset + sch_ep->num_budget_microframes) > esit_boundary)
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break;
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worst_bw = get_max_bw(sch_bw, sch_ep, offset);
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