linux-kernel - [PATCH v2 07/18] usb: xhci-mtk: add a function to get bandwidth boundary

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Date:   Mon, 8 Mar 2021 10:51:56 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ikjoon Jang <ikjn@...omium.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH v2 07/18] usb: xhci-mtk: add a function to get bandwidth boundary

This is used to simplify unit test.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2: no changes
---
 drivers/usb/host/xhci-mtk-sch.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index 9a9685f74940..8fe4481eb43d 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -37,6 +37,25 @@ static int is_fs_or_ls(enum usb_device_speed speed)
 	return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
 }
 
+static u32 get_bw_boundary(enum usb_device_speed speed)
+{
+	u32 boundary;
+
+	switch (speed) {
+	case USB_SPEED_SUPER_PLUS:
+		boundary = SSP_BW_BOUNDARY;
+		break;
+	case USB_SPEED_SUPER:
+		boundary = SS_BW_BOUNDARY;
+		break;
+	default:
+		boundary = HS_BW_BOUNDARY;
+		break;
+	}
+
+	return boundary;
+}
+
 /*
 * get the index of bandwidth domains array which @ep belongs to.
 *
@@ -579,13 +598,7 @@ static int check_sch_bw(struct usb_device *udev,
 			break;
 	}
 
-	if (udev->speed == USB_SPEED_SUPER_PLUS)
-		bw_boundary = SSP_BW_BOUNDARY;
-	else if (udev->speed == USB_SPEED_SUPER)
-		bw_boundary = SS_BW_BOUNDARY;
-	else
-		bw_boundary = HS_BW_BOUNDARY;
-
+	bw_boundary = get_bw_boundary(udev->speed);
 	/* check bandwidth */
 	if (min_bw > bw_boundary)
 		return -ERANGE;
-- 
2.18.0