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From:   Chunfeng Yun <chunfeng.yun@mediatek.com>
To:     Mathias Nyman <mathias.nyman@intel.com>
CC:     Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <linux-usb@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, Ikjoon Jang <ikjn@chromium.org>,
        Eddie Hung <eddie.hung@mediatek.com>,
        Sergei Shtylyov <sergei.shtylyov@gmail.com>
Subject: [PATCH v3 4/4] usb: xhci-mtk: use first-fit for LS/FS
Date:   Fri, 7 May 2021 10:11:27 +0800
Message-ID: <20210507021127.54717-4-chunfeng.yun@mediatek.com>
In-Reply-To: <20210507021127.54717-1-chunfeng.yun@mediatek.com>
References: <20210507021127.54717-1-chunfeng.yun@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
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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@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