[PATCH 03/17] usb: xhci-mtk: get the microframe boundary for ESIT

Chunfeng Yun
2021-03-05T09:04:06Z

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 transfered
before the last CS.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
drivers/usb/host/xhci-mtk-sch.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 8950d1f10a7f..e3b18dfca874 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -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 += 1;
+ else if (boundary > 1) /* normally esit >= 8 for FS/LS */
+ boundary -= 1;
+ }
+
+ 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);
--
2.18.0