can: gs_usb: activate quirks for CANtact Pro unconditionally

The CANtact Pro from LinkLayer Labs is based on the LPC54616 µC, which
is affected by the NXP LPC USB transfer erratum. However, the current
firmware (version 2) doesn't set the
GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX bit.

This patch sets the feature GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX to
workaround this issue.

For the GS_USB_BREQ_DATA_BITTIMING USB control message the CANtact Pro
firmware uses a request value, which is already used by the
candleLight firmware for a different purpose
(GS_USB_BREQ_GET_USER_ID).

This patch set the feature GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO to
workaround this issue.

Link: https://lore.kernel.org/all/20220309124132.291861-19-mkl@pengutronix.de
Cc: Ryan Edwards <ryan.edwards@gmail.com>
Signed-off-by: Peter Fink <pfink@christ-es.de>
Signed-off-by: Christoph Möhring <cmoehring@christ-es.de>
[mkl: improve check for CANtact Pro and add GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO quirk]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/gs_usb.c

@@ -993,6 +993,29 @@ static struct gs_can *gs_make_candev(unsigned int channel,
 		dev->can.do_set_data_bittiming = gs_usb_set_data_bittiming;
 	}
 
+	/* The CANtact Pro from LinkLayer Labs is based on the
+	 * LPC54616 µC, which is affected by the NXP LPC USB transfer
+	 * erratum. However, the current firmware (version 2) doesn't
+	 * set the GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX bit. Set the
+	 * feature GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX to workaround
+	 * this issue.
+	 *
+	 * For the GS_USB_BREQ_DATA_BITTIMING USB control message the
+	 * CANtact Pro firmware uses a request value, which is already
+	 * used by the candleLight firmware for a different purpose
+	 * (GS_USB_BREQ_GET_USER_ID). Set the feature
+	 * GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO to workaround this
+	 * issue.
+	 */
+	if (dev->udev->descriptor.idVendor == cpu_to_le16(USB_GSUSB_1_VENDOR_ID) &&
+	    dev->udev->descriptor.idProduct == cpu_to_le16(USB_GSUSB_1_PRODUCT_ID) &&
+	    dev->udev->manufacturer && dev->udev->product &&
+	    !strcmp(dev->udev->manufacturer, "LinkLayer Labs") &&
+	    !strcmp(dev->udev->product, "CANtact Pro") &&
+	    (le32_to_cpu(dconf->sw_version) <= 2))
+		dev->feature |= GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX |
+			GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO;
+
 	if (le32_to_cpu(dconf->sw_version) > 1)
 		if (feature & GS_CAN_FEATURE_IDENTIFY)
 			netdev->ethtool_ops = &gs_usb_ethtool_ops;