[PATCH v3 4/4] usb: xhci-mtk: use first-fit for LS/FS

[Chunfeng Yun]

Use first-fit instead of best-fit for LS/FS devices under TT,
we found that best-fit will consume more bandwidth for some
cases.

Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
---
v3: no changes
---
 drivers/usb/host/xhci-mtk-sch.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 9fb75085e40f..c07411d9b16f 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -634,6 +634,11 @@ static int check_sch_bw(struct mu3h_sch_bw_info *sch_bw,
 			min_bw = worst_bw;
 			min_index = offset;
 		}
+
+		/* use first-fit for LS/FS */
+		if (sch_ep->sch_tt && min_index >= 0)
+			break;
+
 		if (min_bw == 0)
 			break;
 	}
-- 
2.18.0