From 7ca3f841e2a66d2145bedc06dbcce5044725f622 Mon Sep 17 00:00:00 2001
From: Ondrej Jirman <megi@xff.cz>
Date: Sat, 13 Jan 2024 21:24:24 +0100
Subject: media: sun6i-csi: subdev: Use subdev active state to store active
 format

The sun6i_csi_bridge structure stores the active format as a struct
v4l2_mbus_framefmt instance. Now that the V4L2 subdev core supports
managing the active state, use it to replace the manually-managed
format. This simplifies the implementation of the subdev operations by
removing the need for a custom .get_fmt() handler.

The subdev state now needs to be passed manually from the .s_stream()
operation to internal functions that need to access the format. As a
result, the sun6i_csi_bridge_format() helper function is now unused and
can be dropped.

The .init_state() and .set_fmt() operations also need to be updated
accordingly. As a result, .set_fmt() now correctly propagates the format
from the sink pad to the source pad.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
(cherry picked from commit b14038f024ad84473ed79f3baecc2da9ca16d9a5)
---
 .../sunxi/sun6i-csi/sun6i_csi_bridge.c        | 149 +++++++++---------
 .../sunxi/sun6i-csi/sun6i_csi_bridge.h        |   2 -
 2 files changed, 73 insertions(+), 78 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.c
index 2303e5d2baee..92290876a8b3 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.c
@@ -13,17 +13,6 @@
 #include "sun6i_csi_bridge.h"
 #include "sun6i_csi_reg.h"
 
-/* Helpers */
-
-static void sun6i_csi_bridge_format(struct sun6i_csi_device *csi_dev,
-				    u32 *mbus_code, u32 *field)
-{
-	if (mbus_code)
-		*mbus_code = csi_dev->bridge.mbus_format.code;
-	if (field)
-		*field = csi_dev->bridge.mbus_format.field;
-}
-
 /* Format */
 
 static const struct sun6i_csi_bridge_format sun6i_csi_bridge_formats[] = {
@@ -217,7 +206,8 @@ static void sun6i_csi_bridge_disable(struct sun6i_csi_device *csi_dev)
 }
 
 static void
-sun6i_csi_bridge_configure_parallel(struct sun6i_csi_device *csi_dev)
+sun6i_csi_bridge_configure_parallel(struct sun6i_csi_device *csi_dev,
+				    struct v4l2_subdev_state *state)
 {
 	struct device *dev = csi_dev->dev;
 	struct regmap *regmap = csi_dev->regmap;
@@ -225,14 +215,14 @@ sun6i_csi_bridge_configure_parallel(struct sun6i_csi_device *csi_dev)
 		&csi_dev->bridge.source_parallel.endpoint;
 	unsigned char bus_width = endpoint->bus.parallel.bus_width;
 	unsigned int flags = endpoint->bus.parallel.flags;
-	u32 field;
+	const struct v4l2_mbus_framefmt *sink_format;
 	u32 value = SUN6I_CSI_IF_CFG_IF_CSI;
 
-	sun6i_csi_bridge_format(csi_dev, NULL, &field);
+	sink_format = v4l2_subdev_state_get_format(state, SUN6I_CSI_BRIDGE_PAD_SINK);
 
-	if (field == V4L2_FIELD_INTERLACED ||
-	    field == V4L2_FIELD_INTERLACED_TB ||
-	    field == V4L2_FIELD_INTERLACED_BT)
+	if (sink_format->field == V4L2_FIELD_INTERLACED ||
+	    sink_format->field == V4L2_FIELD_INTERLACED_TB ||
+	    sink_format->field == V4L2_FIELD_INTERLACED_BT)
 		value |= SUN6I_CSI_IF_CFG_SRC_TYPE_INTERLACED |
 			 SUN6I_CSI_IF_CFG_FIELD_DT_PCLK_SHIFT(1) |
 			 SUN6I_CSI_IF_CFG_FIELD_DT_FIELD_VSYNC;
@@ -308,17 +298,18 @@ sun6i_csi_bridge_configure_parallel(struct sun6i_csi_device *csi_dev)
 }
 
 static void
-sun6i_csi_bridge_configure_mipi_csi2(struct sun6i_csi_device *csi_dev)
+sun6i_csi_bridge_configure_mipi_csi2(struct sun6i_csi_device *csi_dev,
+				     struct v4l2_subdev_state *state)
 {
+	const struct v4l2_mbus_framefmt *sink_format;
 	struct regmap *regmap = csi_dev->regmap;
 	u32 value = SUN6I_CSI_IF_CFG_IF_MIPI;
-	u32 field;
 
-	sun6i_csi_bridge_format(csi_dev, NULL, &field);
+	sink_format = v4l2_subdev_state_get_format(state, SUN6I_CSI_BRIDGE_PAD_SINK);
 
-	if (field == V4L2_FIELD_INTERLACED ||
-	    field == V4L2_FIELD_INTERLACED_TB ||
-	    field == V4L2_FIELD_INTERLACED_BT)
+	if (sink_format->field == V4L2_FIELD_INTERLACED ||
+	    sink_format->field == V4L2_FIELD_INTERLACED_TB ||
+	    sink_format->field == V4L2_FIELD_INTERLACED_BT)
 		value |= SUN6I_CSI_IF_CFG_SRC_TYPE_INTERLACED;
 	else
 		value |= SUN6I_CSI_IF_CFG_SRC_TYPE_PROGRESSIVE;
@@ -326,19 +317,20 @@ sun6i_csi_bridge_configure_mipi_csi2(struct sun6i_csi_device *csi_dev)
 	regmap_write(regmap, SUN6I_CSI_IF_CFG_REG, value);
 }
 
-static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
+static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev,
+					      struct v4l2_subdev_state *state)
 {
 	struct regmap *regmap = csi_dev->regmap;
 	bool capture_streaming = csi_dev->capture.state.streaming;
 	const struct sun6i_csi_bridge_format *bridge_format;
 	const struct sun6i_csi_capture_format *capture_format;
-	u32 mbus_code, field, pixelformat;
+	const struct v4l2_mbus_framefmt *sink_format;
+	u32 pixelformat;
 	u8 input_format, input_yuv_seq, output_format;
 	u32 value = 0;
 
-	sun6i_csi_bridge_format(csi_dev, &mbus_code, &field);
-
-	bridge_format = sun6i_csi_bridge_format_find(mbus_code);
+	sink_format = v4l2_subdev_state_get_format(state, SUN6I_CSI_BRIDGE_PAD_SINK);
+	bridge_format = sun6i_csi_bridge_format_find(sink_format->code);
 	if (WARN_ON(!bridge_format))
 		return;
 
@@ -358,9 +350,9 @@ static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 		if (capture_format->input_yuv_seq_invert)
 			input_yuv_seq = bridge_format->input_yuv_seq_invert;
 
-		if (field == V4L2_FIELD_INTERLACED ||
-		    field == V4L2_FIELD_INTERLACED_TB ||
-		    field == V4L2_FIELD_INTERLACED_BT)
+		if (sink_format->field == V4L2_FIELD_INTERLACED ||
+		    sink_format->field == V4L2_FIELD_INTERLACED_TB ||
+		    sink_format->field == V4L2_FIELD_INTERLACED_BT)
 			output_format = capture_format->output_format_field;
 		else
 			output_format = capture_format->output_format_frame;
@@ -371,9 +363,9 @@ static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 	value |= SUN6I_CSI_CH_CFG_INPUT_FMT(input_format);
 	value |= SUN6I_CSI_CH_CFG_INPUT_YUV_SEQ(input_yuv_seq);
 
-	if (field == V4L2_FIELD_TOP)
+	if (sink_format->field == V4L2_FIELD_TOP)
 		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD0;
-	else if (field == V4L2_FIELD_BOTTOM)
+	else if (sink_format->field == V4L2_FIELD_BOTTOM)
 		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD1;
 	else
 		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_EITHER;
@@ -382,16 +374,17 @@ static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 }
 
 static void sun6i_csi_bridge_configure(struct sun6i_csi_device *csi_dev,
-				       struct sun6i_csi_bridge_source *source)
+				       struct sun6i_csi_bridge_source *source,
+				       struct v4l2_subdev_state *state)
 {
 	struct sun6i_csi_bridge *bridge = &csi_dev->bridge;
 
 	if (source == &bridge->source_parallel)
-		sun6i_csi_bridge_configure_parallel(csi_dev);
+		sun6i_csi_bridge_configure_parallel(csi_dev, state);
 	else
-		sun6i_csi_bridge_configure_mipi_csi2(csi_dev);
+		sun6i_csi_bridge_configure_mipi_csi2(csi_dev, state);
 
-	sun6i_csi_bridge_configure_format(csi_dev);
+	sun6i_csi_bridge_configure_format(csi_dev, state);
 }
 
 /* V4L2 Subdev */
@@ -406,6 +399,7 @@ static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
 	struct sun6i_csi_bridge_source *source;
 	struct v4l2_subdev *source_subdev;
 	struct media_pad *remote_pad;
+	struct v4l2_subdev_state *state;
 	int ret;
 
 	/* Source */
@@ -441,8 +435,9 @@ static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
 	sun6i_csi_bridge_irq_clear(csi_dev);
 
 	/* Configure */
-
-	sun6i_csi_bridge_configure(csi_dev, source);
+	state = v4l2_subdev_lock_and_get_active_state(subdev);
+	sun6i_csi_bridge_configure(csi_dev, source, state);
+	v4l2_subdev_unlock_state(state);
 
 	if (capture_streaming)
 		sun6i_csi_capture_configure(csi_dev);
@@ -495,13 +490,9 @@ sun6i_csi_bridge_mbus_format_prepare(struct v4l2_mbus_framefmt *mbus_format)
 static int sun6i_csi_bridge_init_state(struct v4l2_subdev *subdev,
 				       struct v4l2_subdev_state *state)
 {
-	struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
 	unsigned int pad = SUN6I_CSI_BRIDGE_PAD_SINK;
 	struct v4l2_mbus_framefmt *mbus_format =
 		v4l2_subdev_state_get_format(state, pad);
-	struct mutex *lock = &csi_dev->bridge.lock;
-
-	mutex_lock(lock);
 
 	mbus_format->code = sun6i_csi_bridge_formats[0].mbus_code;
 	mbus_format->width = 1280;
@@ -509,8 +500,6 @@ static int sun6i_csi_bridge_init_state(struct v4l2_subdev *subdev,
 
 	sun6i_csi_bridge_mbus_format_prepare(mbus_format);
 
-	mutex_unlock(lock);
-
 	return 0;
 }
 
@@ -527,53 +516,60 @@ sun6i_csi_bridge_enum_mbus_code(struct v4l2_subdev *subdev,
 	return 0;
 }
 
-static int sun6i_csi_bridge_get_fmt(struct v4l2_subdev *subdev,
-				    struct v4l2_subdev_state *state,
-				    struct v4l2_subdev_format *format)
-{
-	struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
-	struct v4l2_mbus_framefmt *mbus_format = &format->format;
-	struct mutex *lock = &csi_dev->bridge.lock;
-
-	mutex_lock(lock);
-
-	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
-		*mbus_format = *v4l2_subdev_state_get_format(state,
-							     format->pad);
-	else
-		*mbus_format = csi_dev->bridge.mbus_format;
-
-	mutex_unlock(lock);
-
-	return 0;
-}
-
 static int sun6i_csi_bridge_set_fmt(struct v4l2_subdev *subdev,
 				    struct v4l2_subdev_state *state,
 				    struct v4l2_subdev_format *format)
 {
-	struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
-	struct v4l2_mbus_framefmt *mbus_format = &format->format;
-	struct mutex *lock = &csi_dev->bridge.lock;
+	struct v4l2_mbus_framefmt *sink_format;
+	struct v4l2_mbus_framefmt *src_format;
 
-	mutex_lock(lock);
+	/*
+	 * As the source format can't change independently of the sink format,
+	 * a set operation on the source is a get.
+	 */
+	if (format->pad == SUN6I_CSI_BRIDGE_PAD_SOURCE)
+		return v4l2_subdev_get_fmt(subdev, state, format);
 
-	sun6i_csi_bridge_mbus_format_prepare(mbus_format);
+	sink_format = v4l2_subdev_state_get_format(state, SUN6I_CSI_BRIDGE_PAD_SINK);
 
+	/*
 	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
 		*v4l2_subdev_state_get_format(state, format->pad) =
 			*mbus_format;
+	*/
+
+	if (!sun6i_csi_bridge_format_find(format->format.code))
+		sink_format->code = sun6i_csi_bridge_formats[0].mbus_code;
 	else
-		csi_dev->bridge.mbus_format = *mbus_format;
+		sink_format->code = format->format.code;
+
+	sink_format->width = format->format.width;
+	sink_format->height = format->format.height;
+
+	/* Accept any colorspace as the CSI bridge isn't colorspace-aware. */
+	sink_format->colorspace = format->format.colorspace;
+	sink_format->xfer_func = format->format.xfer_func;
+	sink_format->ycbcr_enc = format->format.ycbcr_enc;
+	sink_format->quantization = format->format.quantization;
+
+	sink_format->field = V4L2_FIELD_NONE;
 
-	mutex_unlock(lock);
+	format->format = *sink_format;
+
+	/*
+	 * Propagate the format to the source pad. The CSI bridge can't
+	 * transcode, the format on the source pad always matches the sink pad
+	 * exactly.
+	 */
+	src_format = v4l2_subdev_state_get_format(state, SUN6I_CSI_BRIDGE_PAD_SOURCE);
+	*src_format = *sink_format;
 
 	return 0;
 }
 
 static const struct v4l2_subdev_pad_ops sun6i_csi_bridge_pad_ops = {
 	.enum_mbus_code	= sun6i_csi_bridge_enum_mbus_code,
-	.get_fmt	= sun6i_csi_bridge_get_fmt,
+	.get_fmt	= v4l2_subdev_get_fmt,
 	.set_fmt	= sun6i_csi_bridge_set_fmt,
 };
 
@@ -771,8 +767,6 @@ int sun6i_csi_bridge_setup(struct sun6i_csi_device *csi_dev)
 	};
 	int ret;
 
-	mutex_init(&bridge->lock);
-
 	/* V4L2 Subdev */
 
 	v4l2_subdev_init(subdev, &sun6i_csi_bridge_subdev_ops);
@@ -801,6 +795,9 @@ int sun6i_csi_bridge_setup(struct sun6i_csi_device *csi_dev)
 		return ret;
 
 	/* V4L2 Subdev */
+	ret = v4l2_subdev_init_finalize(subdev);
+	if (ret)
+		goto error_media_entity;
 
 	if (csi_dev->isp_available)
 		ret = v4l2_async_register_subdev(subdev);
diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.h b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.h
index 722b633b7893..a5b0a6f064dd 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.h
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.h
@@ -42,8 +42,6 @@ struct sun6i_csi_bridge {
 	struct v4l2_subdev		subdev;
 	struct v4l2_async_notifier	notifier;
 	struct media_pad		pads[2];
-	struct v4l2_mbus_framefmt	mbus_format;
-	struct mutex			lock; /* Mbus format lock. */
 
 	struct sun6i_csi_bridge_source	source_parallel;
 	struct sun6i_csi_bridge_source	source_mipi_csi2;
-- 
2.35.3

