video: udlfb: Fix read EDID timeout

[ Upstream commit c98769475575c8a585f5b3952f4b5f90266f699b ]

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: 18dffdf8913a ("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>

diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c
index ef08a104fb42c6dafe3c88d32ca18b7430ede759..d44f14242016e07682134c4f2bfa4832e6286462 100644 (file)
--- a/drivers/video/fbdev/udlfb.c
+++ b/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;
                }