media: ddbridge: fix gap handling

Force gap setting if given by attribute and enable gap for older regmaps.
Also, setting a gap value of 128 via sysfs will now disable gap.
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/ddbridge/ddbridge-core.c

@@ -336,6 +336,7 @@ static void calc_con(struct ddb_output *output, u32 *con, u32 *con2, u32 flags)
 	if (output->port->gap != 0xffffffff) {
 		flags |= 1;
 		gap = output->port->gap;
+		max_bitrate = 0;
 	}
 	if (dev->link[0].info->type == DDB_OCTOPUS_CI && output->port->nr > 1) {
 		*con = 0x10c;
@@ -372,6 +373,7 @@ static void calc_con(struct ddb_output *output, u32 *con, u32 *con2, u32 flags)
 				*con |= 0x810; /* 96 MBit/s and gap */
 				max_bitrate = 96000;
 			}
+			*con |= 0x10; /* enable gap */
 		}
 	}
 	if (max_bitrate > 0) {
@@ -3203,8 +3205,10 @@ static ssize_t gap_store(struct device *device, struct device_attribute *attr,
 
 	if (sscanf(buf, "%u\n", &val) != 1)
 		return -EINVAL;
-	if (val > 20)
+	if (val > 128)
 		return -EINVAL;
+	if (val == 128)
+		val = 0xffffffff;
 	dev->port[num].gap = val;
 	return count;
 }