media: rkisp1: csi: Plumb the CSI RX subdev

Connect the CSI receiver subdevice between the sensors and the ISP. This
includes:

- Calling the subdevice via the v4l2 subdev API
- Moving the async notifier for the sensor from the ISP to the CSI
  receiver
- In the ISP, create a media link to the CSI receiver, and remove the
  media link creation to the sensor
- In the CSI receiver, create a media link to the sensor

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Dafna Hirschfeld <dafna@fastmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c

@@ -47,6 +47,34 @@ rkisp1_csi_get_pad_fmt(struct rkisp1_csi *csi,
 		return v4l2_subdev_get_try_format(&csi->sd, &state, pad);
 }
 
+int rkisp1_csi_link_sensor(struct rkisp1_device *rkisp1, struct v4l2_subdev *sd,
+			   struct rkisp1_sensor_async *s_asd,
+			   unsigned int source_pad)
+{
+	struct rkisp1_csi *csi = &rkisp1->csi;
+	int ret;
+
+	s_asd->pixel_rate_ctrl = v4l2_ctrl_find(sd->ctrl_handler,
+						V4L2_CID_PIXEL_RATE);
+	if (!s_asd->pixel_rate_ctrl) {
+		dev_err(rkisp1->dev, "No pixel rate control in subdev %s\n",
+			sd->name);
+		return -EINVAL;
+	}
+
+	/* Create the link from the sensor to the CSI receiver. */
+	ret = media_create_pad_link(&sd->entity, source_pad,
+				    &csi->sd.entity, RKISP1_CSI_PAD_SINK,
+				    !s_asd->index ? MEDIA_LNK_FL_ENABLED : 0);
+	if (ret) {
+		dev_err(csi->rkisp1->dev, "failed to link src pad of %s\n",
+			sd->name);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int rkisp1_csi_config(struct rkisp1_csi *csi,
 			     const struct rkisp1_sensor_async *sensor)
 {
@@ -122,7 +150,7 @@ static void rkisp1_csi_disable(struct rkisp1_csi *csi)
 		     val & (~RKISP1_CIF_MIPI_CTRL_OUTPUT_ENA));
 }
 
-int rkisp1_csi_start(struct rkisp1_csi *csi,
+static int rkisp1_csi_start(struct rkisp1_csi *csi,
 			    const struct rkisp1_sensor_async *sensor)
 {
 	struct rkisp1_device *rkisp1 = csi->rkisp1;
@@ -158,7 +186,7 @@ int rkisp1_csi_start(struct rkisp1_csi *csi,
 	return 0;
 }
 
-void rkisp1_csi_stop(struct rkisp1_csi *csi)
+static void rkisp1_csi_stop(struct rkisp1_csi *csi)
 {
 	rkisp1_csi_disable(csi);
 

drivers/media/platform/rockchip/rkisp1/rkisp1-csi.h

@@ -21,8 +21,8 @@ void rkisp1_csi_cleanup(struct rkisp1_device *rkisp1);
 int rkisp1_csi_register(struct rkisp1_device *rkisp1);
 void rkisp1_csi_unregister(struct rkisp1_device *rkisp1);
 
-int rkisp1_csi_start(struct rkisp1_csi *csi,
+int rkisp1_csi_link_sensor(struct rkisp1_device *rkisp1, struct v4l2_subdev *sd,
-		     const struct rkisp1_sensor_async *sensor);
+			   struct rkisp1_sensor_async *s_asd,
-void rkisp1_csi_stop(struct rkisp1_csi *csi);
+			   unsigned int source_pad);
 
 #endif /* _RKISP1_CSI_H */

drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c

@@ -17,6 +17,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
 #include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
 
 #include "rkisp1-common.h"
 #include "rkisp1-csi.h"
@@ -67,18 +68,28 @@
  *
  * Media Topology
  * --------------
+ *
  *          +----------+       +----------+
- *      | Sensor 2 |     | Sensor X |
+ *          | Sensor 1 |       | Sensor X |
  *          ------------  ...  ------------
  *          |    0     |       |    0     |
- *      +----------+     +----------+      +-----------+
+ *          +----------+       +----------+
- *                  \      |               |  params   |
+ *               |                  |
- *                   \     |               | (output)  |
+ *                \----\       /----/
- *    +----------+    \    |               +-----------+
+ *                     |       |
- *    | Sensor 1 |     v   v                     |
+ *                     v       v
- *    ------------      +------+------+          |
+ *                  +-------------+
- *    |    0     |----->|  0   |  1   |<---------+
+ *                  |      0      |
- *    +----------+      |------+------|
+ *                  ---------------
+ *                  |  CSI-2 RX   |
+ *                  ---------------         +-----------+
+ *                  |      1      |         |  params   |
+ *                  +-------------+         | (output)  |
+ *                         |               +-----------+
+ *                         v                     |
+ *                      +------+------+          |
+ *                      |  0   |  1   |<---------+
+ *                      |------+------|
  *                      |     ISP     |
  *                      |------+------|
  *        +-------------|  2   |  3   |----------+
@@ -119,17 +130,8 @@ static int rkisp1_subdev_notifier_bound(struct v4l2_async_notifier *notifier,
 		container_of(asd, struct rkisp1_sensor_async, asd);
 	int source_pad;
 
-	s_asd->pixel_rate_ctrl = v4l2_ctrl_find(sd->ctrl_handler,
-						V4L2_CID_PIXEL_RATE);
-	if (!s_asd->pixel_rate_ctrl) {
-		dev_err(rkisp1->dev, "No pixel rate control in subdev %s\n",
-			sd->name);
-		return -EINVAL;
-	}
-
 	s_asd->sd = sd;
 
-	/* Create the link to the sensor. */
 	source_pad = media_entity_get_fwnode_pad(&sd->entity, s_asd->source_ep,
 						 MEDIA_PAD_FL_SOURCE);
 	if (source_pad < 0) {
@@ -138,10 +140,7 @@ static int rkisp1_subdev_notifier_bound(struct v4l2_async_notifier *notifier,
 		return source_pad;
 	}
 
-	return media_create_pad_link(&sd->entity, source_pad,
+	return rkisp1_csi_link_sensor(rkisp1, sd, s_asd, source_pad);
-				     &rkisp1->isp.sd.entity,
-				     RKISP1_ISP_PAD_SINK_VIDEO,
-				     !s_asd->index ? MEDIA_LNK_FL_ENABLED : 0);
 }
 
 static int rkisp1_subdev_notifier_complete(struct v4l2_async_notifier *notifier)
@@ -283,6 +282,14 @@ static int rkisp1_create_links(struct rkisp1_device *rkisp1)
 	unsigned int i;
 	int ret;
 
+	/* Link the CSI receiver to the ISP. */
+	ret = media_create_pad_link(&rkisp1->csi.sd.entity, RKISP1_CSI_PAD_SRC,
+				    &rkisp1->isp.sd.entity,
+				    RKISP1_ISP_PAD_SINK_VIDEO,
+				    MEDIA_LNK_FL_ENABLED);
+	if (ret)
+		return ret;
+
 	/* create ISP->RSZ->CAP links */
 	for (i = 0; i < 2; i++) {
 		struct media_entity *resizer =
@@ -364,13 +371,6 @@ static int rkisp1_entities_register(struct rkisp1_device *rkisp1)
 	if (ret)
 		goto error;
 
-	ret = rkisp1_subdev_notifier_register(rkisp1);
-	if (ret) {
-		dev_err(rkisp1->dev,
-			"Failed to register subdev notifier(%d)\n", ret);
-		goto error;
-	}
-
 	return 0;
 
 error:
@@ -534,10 +534,16 @@ static int rkisp1_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_cleanup_csi;
 
+	ret = rkisp1_subdev_notifier_register(rkisp1);
+	if (ret)
+		goto err_unreg_entities;
+
 	rkisp1_debug_init(rkisp1);
 
 	return 0;
 
+err_unreg_entities:
+	rkisp1_entities_unregister(rkisp1);
 err_cleanup_csi:
 	rkisp1_csi_cleanup(rkisp1);
 err_unreg_media_dev:

drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c

@@ -16,7 +16,6 @@
 #include <media/v4l2-event.h>
 
 #include "rkisp1-common.h"
-#include "rkisp1-csi.h"
 
 #define RKISP1_DEF_SINK_PAD_FMT MEDIA_BUS_FMT_SRGGB10_1X10
 #define RKISP1_DEF_SRC_PAD_FMT MEDIA_BUS_FMT_YUYV8_2X8
@@ -728,17 +727,13 @@ static int rkisp1_isp_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct rkisp1_isp *isp = to_rkisp1_isp(sd);
 	struct rkisp1_device *rkisp1 = isp->rkisp1;
-	const struct rkisp1_sensor_async *asd;
 	struct media_pad *source_pad;
 	struct media_pad *sink_pad;
 	int ret;
 
 	if (!enable) {
 		v4l2_subdev_call(rkisp1->source, video, s_stream, false);
-
-		rkisp1_csi_stop(&rkisp1->csi);
 		rkisp1_isp_stop(isp);
-
 		return 0;
 	}
 
@@ -756,30 +751,20 @@ static int rkisp1_isp_s_stream(struct v4l2_subdev *sd, int enable)
 		return -EPIPE;
 	}
 
-	asd = container_of(rkisp1->source->asd, struct rkisp1_sensor_async,
+	if (rkisp1->source != &rkisp1->csi.sd)
-			   asd);
+		return -EPIPE;
-
-	if (asd->mbus_type != V4L2_MBUS_CSI2_DPHY)
-		return -EINVAL;
 
 	isp->frame_sequence = -1;
 	mutex_lock(&isp->ops_lock);
-	ret = rkisp1_config_cif(isp, asd->mbus_type, asd->mbus_flags);
+	ret = rkisp1_config_cif(isp, V4L2_MBUS_CSI2_DPHY, 0);
 	if (ret)
 		goto mutex_unlock;
 
 	rkisp1_isp_start(isp);
 
-	ret = rkisp1_csi_start(&rkisp1->csi, asd);
-	if (ret) {
-		rkisp1_isp_stop(isp);
-		goto mutex_unlock;
-	}
-
 	ret = v4l2_subdev_call(rkisp1->source, video, s_stream, true);
 	if (ret) {
 		rkisp1_isp_stop(isp);
-		rkisp1_csi_stop(&rkisp1->csi);
 		goto mutex_unlock;
 	}