linux-kernel - [PATCH 1/4] USB: gadget: f_rndis: fix bitrate for SuperSpeed and above

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Message-Id: <20201126180235.254523-1-gregkh@google.com>
Date:   Thu, 26 Nov 2020 19:02:32 +0100
From:   Greg Kroah-Hartman <gregkh@...gle.com>
To:     balbi@...nel.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Will McVicker <willmcvicker@...gle.com>,
        EJ Hsu <ejh@...dia.com>, Peter Chen <peter.chen@....com>,
        stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 1/4] USB: gadget: f_rndis: fix bitrate for SuperSpeed and above

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

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/function/f_rndis.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index 9534c8ab62a8..0739b05a0ef7 100644
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -87,8 +87,10 @@ static inline struct f_rndis *func_to_rndis(struct usb_function *f)
 /* 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
-- 
2.29.2