[media] gscpa_ov519: Fix the bandwidth calc for enabling compression

Somehow the code has ended up assuming 1400 packets/sec which of course
is wrong for usb1 devices like the ov511 cameras. usb1 only does 1000
(isoc) packets / sec.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/ov519.c

@@ -3683,8 +3683,8 @@ static void ov511_mode_init_regs(struct sd *sd)
 	/* Check if we have enough bandwidth to disable compression */
 	fps = (interlaced ? 60 : 30) / (sd->clockdiv + 1) + 1;
 	needed = fps * sd->gspca_dev.width * sd->gspca_dev.height * 3 / 2;
-	/* 1400 is a conservative estimate of the max nr of isoc packets/sec */
-	if (needed > 1400 * packet_size) {
+	/* 1000 isoc packets/sec */
+	if (needed > 1000 * packet_size) {
 		/* Enable Y and UV quantization and compression */
 		reg_w(sd, R511_COMP_EN, 0x07);
 		reg_w(sd, R511_COMP_LUT_EN, 0x03);