linux-kernel - [PATCH 4.19 82/97] usb: gadget: composite: Fix bMaxPower for SuperSpeedPlus

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Message-Id: <20200227132227.876662429@linuxfoundation.org>
Date:   Thu, 27 Feb 2020 14:37:30 +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, Jack Pham <jackp@...eaurora.org>,
        Felipe Balbi <balbi@...nel.org>
Subject: [PATCH 4.19 82/97] usb: gadget: composite: Fix bMaxPower for SuperSpeedPlus

From: Jack Pham <jackp@...eaurora.org>

commit c724417baf162bd3e035659e22cdf990cfb0d917 upstream.

SuperSpeedPlus peripherals must report their bMaxPower of the
configuration descriptor in units of 8mA as per the USB 3.2
specification. The current switch statement in encode_bMaxPower()
only checks for USB_SPEED_SUPER but not USB_SPEED_SUPER_PLUS so
the latter falls back to USB 2.0 encoding which uses 2mA units.
Replace the switch with a simple if/else.

Fixes: eae5820b852f ("usb: gadget: composite: Write SuperSpeedPlus config descriptors")
Signed-off-by: Jack Pham <jackp@...eaurora.org>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/composite.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -437,12 +437,10 @@ static u8 encode_bMaxPower(enum usb_devi
 		val = CONFIG_USB_GADGET_VBUS_DRAW;
 	if (!val)
 		return 0;
-	switch (speed) {
-	case USB_SPEED_SUPER:
-		return DIV_ROUND_UP(val, 8);
-	default:
+	if (speed < USB_SPEED_SUPER)
 		return DIV_ROUND_UP(val, 2);
-	}
+	else
+		return DIV_ROUND_UP(val, 8);
 }
 
 static int config_buf(struct usb_configuration *config,