media: max9286: Use frame interval from subdev state

Use the frame interval stored in the subdev state instead of storing
a copy in the driver private structure.

Initialize the frame interval to the special case 0/0 that in the
max9286 driver represents automatic handling of frame sync.

As the frame sync mode is set at s_stream() time, we can remove it
from max9286_setup().
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240617161135.130719-12-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/media/i2c/max9286.c

@@ -197,8 +197,6 @@ struct max9286_priv {
 	struct v4l2_ctrl *pixelrate_ctrl;
 	unsigned int pixelrate;
 
-	struct v4l2_fract interval;
-
 	unsigned int nsources;
 	unsigned int source_mask;
 	unsigned int route_mask;
@@ -571,11 +569,14 @@ static void max9286_set_video_format(struct max9286_priv *priv,
 		      MAX9286_INVVS | MAX9286_HVSRC_D14);
 }
 
-static void max9286_set_fsync_period(struct max9286_priv *priv)
+static void max9286_set_fsync_period(struct max9286_priv *priv,
+				     struct v4l2_subdev_state *state)
 {
+	const struct v4l2_fract *interval;
 	u32 fsync;
 
-	if (!priv->interval.numerator || !priv->interval.denominator) {
+	interval = v4l2_subdev_state_get_interval(state, MAX9286_SRC_PAD);
+	if (!interval->numerator || !interval->denominator) {
 		/*
 		 * Special case, a null interval enables automatic FRAMESYNC
 		 * mode. FRAMESYNC is taken from the slowest link.
@@ -591,8 +592,8 @@ static void max9286_set_fsync_period(struct max9286_priv *priv)
 	 * The FRAMESYNC generator is configured with a period expressed as a
 	 * number of PCLK periods.
 	 */
-	fsync = div_u64((u64)priv->pixelrate * priv->interval.numerator,
-			priv->interval.denominator);
+	fsync = div_u64((u64)priv->pixelrate * interval->numerator,
+			interval->denominator);
 
 	dev_dbg(&priv->client->dev, "fsync period %u (pclk %u)\n", fsync,
 		priv->pixelrate);
@@ -801,7 +802,7 @@ static int max9286_s_stream(struct v4l2_subdev *sd, int enable)
 		format = v4l2_subdev_state_get_format(state, MAX9286_SRC_PAD);
 
 		max9286_set_video_format(priv, format);
-		max9286_set_fsync_period(priv);
+		max9286_set_fsync_period(priv, state);
 
 		/*
 		 * The frame sync between cameras is transmitted across the
@@ -874,19 +875,11 @@ static int max9286_get_frame_interval(struct v4l2_subdev *sd,
 				      struct v4l2_subdev_state *sd_state,
 				      struct v4l2_subdev_frame_interval *interval)
 {
-	struct max9286_priv *priv = sd_to_max9286(sd);
-
-	/*
-	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
-	 * subdev active state API.
-	 */
-	if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE)
-		return -EINVAL;
-
 	if (interval->pad != MAX9286_SRC_PAD)
 		return -EINVAL;
 
-	interval->interval = priv->interval;
+	interval->interval = *v4l2_subdev_state_get_interval(sd_state,
+							     interval->pad);
 
 	return 0;
 }
@@ -895,19 +888,11 @@ static int max9286_set_frame_interval(struct v4l2_subdev *sd,
 				      struct v4l2_subdev_state *sd_state,
 				      struct v4l2_subdev_frame_interval *interval)
 {
-	struct max9286_priv *priv = sd_to_max9286(sd);
-
-	/*
-	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
-	 * subdev active state API.
-	 */
-	if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE)
-		return -EINVAL;
-
 	if (interval->pad != MAX9286_SRC_PAD)
 		return -EINVAL;
 
-	priv->interval = interval->interval;
+	*v4l2_subdev_state_get_interval(sd_state,
+					interval->pad) = interval->interval;
 
 	return 0;
 }
@@ -994,9 +979,21 @@ static const struct v4l2_mbus_framefmt max9286_default_format = {
 static int max9286_init_state(struct v4l2_subdev *sd,
 			      struct v4l2_subdev_state *state)
 {
+	struct v4l2_fract *interval;
+
 	for (unsigned int i = 0; i < MAX9286_N_PADS; i++)
 		*v4l2_subdev_state_get_format(state, i) = max9286_default_format;
 
+	/*
+	 * Special case: a null interval enables automatic FRAMESYNC mode.
+	 *
+	 * FRAMESYNC is taken from the slowest link. See register 0x01
+	 * configuration.
+	 */
+	interval = v4l2_subdev_state_get_interval(state, MAX9286_SRC_PAD);
+	interval->numerator = 0;
+	interval->denominator = 0;
+
 	return 0;
 }
 
@@ -1143,7 +1140,6 @@ static int max9286_setup(struct max9286_priv *priv)
 	max9286_write(priv, 0x69, (0xf & ~priv->route_mask));
 
 	max9286_set_video_format(priv, &max9286_default_format);
-	max9286_set_fsync_period(priv);
 
 	cfg = max9286_read(priv, 0x1c);
 	if (cfg < 0)