linux-kernel - [PATCH 4.4 028/132] USB: gadget: f_rndis: fix bitrate for SuperSpeed and above

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Message-Id: <20201228124847.771126570@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:48:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        EJ Hsu <ejh@...dia.com>, Peter Chen <peter.chen@....com>,
        Will McVicker <willmcvicker@...gle.com>
Subject: [PATCH 4.4 028/132] USB: gadget: f_rndis: fix bitrate for SuperSpeed and above

From: Will McVicker <willmcvicker@...gle.com>

commit b00f444f9add39b64d1943fa75538a1ebd54a290 upstream.

Align the SuperSpeed Plus bitrate for f_rndis to match f_ncm's ncm_bitrate
defined by commit 1650113888fe ("usb: gadget: f_ncm: add SuperSpeed descriptors
for CDC NCM").

Cc: Felipe Balbi <balbi@...nel.org>
Cc: EJ Hsu <ejh@...dia.com>
Cc: Peter Chen <peter.chen@....com>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
Reviewed-by: Peter Chen <peter.chen@....com>
Link: https://lore.kernel.org/r/20201127140559.381351-2-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/function/f_rndis.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -91,8 +91,10 @@ static inline struct f_rndis *func_to_rn
 /* peak (theoretical) bulk transfer rate in bits-per-second */
 static unsigned int bitrate(struct usb_gadget *g)
 {
+	if (gadget_is_superspeed(g) && g->speed >= USB_SPEED_SUPER_PLUS)
+		return 4250000000U;
 	if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
-		return 13 * 1024 * 8 * 1000 * 8;
+		return 3750000000U;
 	else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
 		return 13 * 512 * 8 * 1000 * 8;
 	else