media: v4l2-subdev: Add pad versions of dv timing subdev calls

Currently, subdev dv timing calls (i.e. g/s/query_dv_timings) are video
ops without a pad argument. This is a problem if the subdevice can have
different dv timings for each pad (e.g. a DisplayPort receiver with
multiple virtual channels).

To solve this, change these calls to include a pad argument, and put
them into pad ops. Keep the old ones temporarily to make the switch
easier.
Signed-off-by: Paweł Anikiel <panikiel@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/v4l2-core/v4l2-subdev.c

@@ -369,6 +369,36 @@ static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 	return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
 }
 
+static int call_s_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
+			     struct v4l2_dv_timings *timings)
+{
+	if (!timings)
+		return -EINVAL;
+
+	return check_pad(sd, pad) ? :
+	       sd->ops->pad->s_dv_timings(sd, pad, timings);
+}
+
+static int call_g_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
+			     struct v4l2_dv_timings *timings)
+{
+	if (!timings)
+		return -EINVAL;
+
+	return check_pad(sd, pad) ? :
+	       sd->ops->pad->g_dv_timings(sd, pad, timings);
+}
+
+static int call_query_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
+				 struct v4l2_dv_timings *timings)
+{
+	if (!timings)
+		return -EINVAL;
+
+	return check_pad(sd, pad) ? :
+	       sd->ops->pad->query_dv_timings(sd, pad, timings);
+}
+
 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 			       struct v4l2_dv_timings_cap *cap)
 {
@@ -487,6 +517,9 @@ static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
 	.set_frame_interval	= call_set_frame_interval,
 	.get_edid		= call_get_edid,
 	.set_edid		= call_set_edid,
+	.s_dv_timings		= call_s_dv_timings,
+	.g_dv_timings		= call_g_dv_timings,
+	.query_dv_timings	= call_query_dv_timings,
 	.dv_timings_cap		= call_dv_timings_cap,
 	.enum_dv_timings	= call_enum_dv_timings,
 	.get_frame_desc		= call_get_frame_desc,

include/media/v4l2-subdev.h

@@ -791,6 +791,14 @@ struct v4l2_subdev_state {
  *
  * @set_edid: callback for VIDIOC_SUBDEV_S_EDID() ioctl handler code.
  *
+ * @s_dv_timings: Set custom dv timings in the sub device. This is used
+ *	when sub device is capable of setting detailed timing information
+ *	in the hardware to generate/detect the video signal.
+ *
+ * @g_dv_timings: Get custom dv timings in the sub device.
+ *
+ * @query_dv_timings: callback for VIDIOC_QUERY_DV_TIMINGS() ioctl handler code.
+ *
  * @dv_timings_cap: callback for VIDIOC_SUBDEV_DV_TIMINGS_CAP() ioctl handler
  *		    code.
  *
@@ -864,6 +872,12 @@ struct v4l2_subdev_pad_ops {
 				  struct v4l2_subdev_frame_interval *interval);
 	int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
 	int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
+	int (*s_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
+			    struct v4l2_dv_timings *timings);
+	int (*g_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
+			    struct v4l2_dv_timings *timings);
+	int (*query_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
+				struct v4l2_dv_timings *timings);
 	int (*dv_timings_cap)(struct v4l2_subdev *sd,
 			      struct v4l2_dv_timings_cap *cap);
 	int (*enum_dv_timings)(struct v4l2_subdev *sd,