media: staging: imx: request mbus_config in csi_start

commit 9df2aaa upstream.

Request the upstream mbus_config in csi_start, which starts the stream,
instead of caching it in link_validate.

This allows to get rid of the mbus_cfg field in the struct csi_priv and
avoids state in the driver.

Fixes: 4a34ec8 ("[media] media: imx: Add CSI subdev driver")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: tretter

drivers/staging/media/imx/imx-media-csi.c

@@ -97,9 +97,6 @@ struct csi_priv {
 	/* the mipi virtual channel number at link validate */
 	int vc_num;
 
-	/* media bus config of the upstream subdevice CSI is receiving from */
-	struct v4l2_mbus_config mbus_cfg;
-
 	spinlock_t irqlock; /* protect eof_irq handler */
 	struct timer_list eof_timeout_timer;
 	int eof_irq;
@@ -403,7 +400,8 @@ static void csi_idmac_unsetup_vb2_buf(struct csi_priv *priv,
 }
 
 /* init the SMFC IDMAC channel */
-static int csi_idmac_setup_channel(struct csi_priv *priv)
+static int csi_idmac_setup_channel(struct csi_priv *priv,
+				   struct v4l2_mbus_config *mbus_cfg)
 {
 	struct imx_media_video_dev *vdev = priv->vdev;
 	const struct imx_media_pixfmt *incc;
@@ -432,7 +430,7 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	image.phys0 = phys[0];
 	image.phys1 = phys[1];
 
-	passthrough = requires_passthrough(&priv->mbus_cfg, infmt, incc);
+	passthrough = requires_passthrough(mbus_cfg, infmt, incc);
 	passthrough_cycles = 1;
 
 	/*
@@ -572,11 +570,12 @@ static void csi_idmac_unsetup(struct csi_priv *priv,
 	csi_idmac_unsetup_vb2_buf(priv, state);
 }
 
-static int csi_idmac_setup(struct csi_priv *priv)
+static int csi_idmac_setup(struct csi_priv *priv,
+			   struct v4l2_mbus_config *mbus_cfg)
 {
 	int ret;
 
-	ret = csi_idmac_setup_channel(priv);
+	ret = csi_idmac_setup_channel(priv, mbus_cfg);
 	if (ret)
 		return ret;
 
@@ -595,7 +594,8 @@ static int csi_idmac_setup(struct csi_priv *priv)
 	return 0;
 }
 
-static int csi_idmac_start(struct csi_priv *priv)
+static int csi_idmac_start(struct csi_priv *priv,
+			   struct v4l2_mbus_config *mbus_cfg)
 {
 	struct imx_media_video_dev *vdev = priv->vdev;
 	int ret;
@@ -619,7 +619,7 @@ static int csi_idmac_start(struct csi_priv *priv)
 	priv->last_eof = false;
 	priv->nfb4eof = false;
 
-	ret = csi_idmac_setup(priv);
+	ret = csi_idmac_setup(priv, mbus_cfg);
 	if (ret) {
 		v4l2_err(&priv->sd, "csi_idmac_setup failed: %d\n", ret);
 		goto out_free_dma_buf;
@@ -701,7 +701,8 @@ static void csi_idmac_stop(struct csi_priv *priv)
 }
 
 /* Update the CSI whole sensor and active windows */
-static int csi_setup(struct csi_priv *priv)
+static int csi_setup(struct csi_priv *priv,
+		     struct v4l2_mbus_config *mbus_cfg)
 {
 	struct v4l2_mbus_framefmt *infmt, *outfmt;
 	const struct imx_media_pixfmt *incc;
@@ -719,7 +720,7 @@ static int csi_setup(struct csi_priv *priv)
 	 * if cycles is set, we need to handle this over multiple cycles as
 	 * generic/bayer data
 	 */
-	if (is_parallel_bus(&priv->mbus_cfg) && incc->cycles) {
+	if (is_parallel_bus(mbus_cfg) && incc->cycles) {
 		if_fmt.width *= incc->cycles;
 		crop.width *= incc->cycles;
 	}
@@ -730,7 +731,7 @@ static int csi_setup(struct csi_priv *priv)
 			     priv->crop.width == 2 * priv->compose.width,
 			     priv->crop.height == 2 * priv->compose.height);
 
-	ipu_csi_init_interface(priv->csi, &priv->mbus_cfg, &if_fmt, outfmt);
+	ipu_csi_init_interface(priv->csi, mbus_cfg, &if_fmt, outfmt);
 
 	ipu_csi_set_dest(priv->csi, priv->dest);
 
@@ -745,9 +746,17 @@ static int csi_setup(struct csi_priv *priv)
 
 static int csi_start(struct csi_priv *priv)
 {
+	struct v4l2_mbus_config mbus_cfg = { .type = 0 };
 	struct v4l2_fract *input_fi, *output_fi;
 	int ret;
 
+	ret = csi_get_upstream_mbus_config(priv, &mbus_cfg);
+	if (ret) {
+		v4l2_err(&priv->sd,
+			 "failed to get upstream media bus configuration\n");
+		return ret;
+	}
+
 	input_fi = &priv->frame_interval[CSI_SINK_PAD];
 	output_fi = &priv->frame_interval[priv->active_output_pad];
 
@@ -758,7 +767,7 @@ static int csi_start(struct csi_priv *priv)
 		return ret;
 
 	/* Skip first few frames from a BT.656 source */
-	if (priv->mbus_cfg.type == V4L2_MBUS_BT656) {
+	if (mbus_cfg.type == V4L2_MBUS_BT656) {
 		u32 delay_usec, bad_frames = 20;
 
 		delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC *
@@ -769,12 +778,12 @@ static int csi_start(struct csi_priv *priv)
 	}
 
 	if (priv->dest == IPU_CSI_DEST_IDMAC) {
-		ret = csi_idmac_start(priv);
+		ret = csi_idmac_start(priv, &mbus_cfg);
 		if (ret)
 			goto stop_upstream;
 	}
 
-	ret = csi_setup(priv);
+	ret = csi_setup(priv, &mbus_cfg);
 	if (ret)
 		goto idmac_stop;
 
@@ -1122,7 +1131,6 @@ static int csi_link_validate(struct v4l2_subdev *sd,
 
 	mutex_lock(&priv->lock);
 
-	priv->mbus_cfg = mbus_cfg;
 	is_csi2 = !is_parallel_bus(&mbus_cfg);
 	if (is_csi2) {
 		/*