video: udlfb: Fix read EDID timeout

BugLink: http://bugs.launchpad.net/bugs/1745052

[ Upstream commit c9876947 ]

While usb_control_msg function expects timeout in miliseconds, a value
of HZ is used. Replace it with USB_CTRL_GET_TIMEOUT and also fix error
message which looks like:
udlfb: Read EDID byte 78 failed err ffffff92
as error is either negative errno or number of bytes transferred use %d
format specifier.

Returned EDID is in second byte, so return error when less than two bytes
are received.

Fixes: 18dffdf8 ("staging: udlfb: enhance EDID and mode handling support")
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Cc: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/video/fbdev/udlfb.c

@@ -769,11 +769,11 @@ static int dlfb_get_edid(struct dlfb_data *dev, char *edid, int len)
 
 	for (i = 0; i < len; i++) {
 		ret = usb_control_msg(dev->udev,
-				    usb_rcvctrlpipe(dev->udev, 0), (0x02),
-				    (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
-				    HZ);
-		if (ret < 1) {
-			pr_err("Read EDID byte %d failed err %x\n", i, ret);
+				      usb_rcvctrlpipe(dev->udev, 0), 0x02,
+				      (0x80 | (0x02 << 5)), i << 8, 0xA1,
+				      rbuf, 2, USB_CTRL_GET_TIMEOUT);
+		if (ret < 2) {
+			pr_err("Read EDID byte %d failed: %d\n", i, ret);
 			i--;
 			break;
 		}