Re: [PATCH v2 40/55] media: rkisp1: csi: Plumb the CSI RX subdev

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On 01.07.2022 02:06, Laurent Pinchart wrote:
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@xxxxxxxxxxxxxxxx>
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

Reviewed-by Dafna Hirschfeld <dafna@xxxxxxxxxxxx>

---
Changes since v1:

- Clarify commit message
- Update the media device topology
- Fix white space
---
.../platform/rockchip/rkisp1/rkisp1-csi.c     | 34 ++++++++-
.../platform/rockchip/rkisp1/rkisp1-csi.h     |  6 +-
.../platform/rockchip/rkisp1/rkisp1-dev.c     | 70 ++++++++++---------
.../platform/rockchip/rkisp1/rkisp1-isp.c     | 21 +-----
4 files changed, 75 insertions(+), 56 deletions(-)

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c
index 173a0550af5c..6d904bbef424 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c
@@ -44,6 +44,34 @@ 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)
{
@@ -120,8 +148,8 @@ static void rkisp1_csi_disable(struct rkisp1_csi *csi)
		     val & (~RKISP1_CIF_MIPI_CTRL_OUTPUT_ENA));
}

-int rkisp1_csi_start(struct rkisp1_csi *csi,
-		     const struct rkisp1_sensor_async *sensor)
+static int rkisp1_csi_start(struct rkisp1_csi *csi,
+			    const struct rkisp1_sensor_async *sensor)
{
	struct rkisp1_device *rkisp1 = csi->rkisp1;
	union phy_configure_opts opts;
@@ -157,7 +185,7 @@ 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);

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.h
index ddf8e5e08f55..eadcd24f65fb 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.h
+++ b/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,
-		     const struct rkisp1_sensor_async *sensor);
-void rkisp1_csi_stop(struct rkisp1_csi *csi);
+int rkisp1_csi_link_sensor(struct rkisp1_device *rkisp1, struct v4l2_subdev *sd,
+			   struct rkisp1_sensor_async *s_asd,
+			   unsigned int source_pad);

#endif /* _RKISP1_CSI_H */
diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
index 5428e19e818f..c3a7ab70bbef 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
+++ b/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 |
- *      ------------ ... ------------
- *      |    0     |     |    0     |
- *      +----------+     +----------+      +-----------+
- *                  \      |               |  params   |
- *                   \     |               | (output)  |
- *    +----------+    \    |               +-----------+
- *    | Sensor 1 |     v   v                     |
- *    ------------      +------+------+          |
- *    |    0     |----->|  0   |  1   |<---------+
- *    +----------+      |------+------|
+ *
+ *          +----------+       +----------+
+ *          | Sensor 1 |       | Sensor X |
+ *          ------------  ...  ------------
+ *          |    0     |       |    0     |
+ *          +----------+       +----------+
+ *               |                  |
+ *                \----\       /----/
+ *                     |       |
+ *                     v       v
+ *                  +-------------+
+ *                  |      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,
-				     &rkisp1->isp.sd.entity,
-				     RKISP1_ISP_PAD_SINK_VIDEO,
-				     !s_asd->index ? MEDIA_LNK_FL_ENABLED : 0);
+	return rkisp1_csi_link_sensor(rkisp1, sd, s_asd, source_pad);
}

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:
diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
index d7e2802d11f5..ea0bbccb5aee 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
+++ b/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,
-			   asd);
-
-	if (asd->mbus_type != V4L2_MBUS_CSI2_DPHY)
-		return -EINVAL;
+	if (rkisp1->source != &rkisp1->csi.sd)
+		return -EPIPE;

	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;
	}

--
Regards,

Laurent Pinchart


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