media: staging: media: starfive: camss: Add ISP driver

Add ISP driver for StarFive Camera Subsystem.
Signed-off-by: Jack Zhu <jack.zhu@starfivetech.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/staging/media/starfive/camss/Makefile

@@ -5,6 +5,8 @@
 
 starfive-camss-objs += \
 		stf-camss.o \
+		stf-isp.o \
+		stf-isp-hw-ops.o \
 		stf-video.o
 
 obj-$(CONFIG_VIDEO_STARFIVE_CAMSS) += starfive-camss.o

drivers/staging/media/starfive/camss/stf-camss.h

@@ -18,6 +18,8 @@
 #include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
 
+#include "stf-isp.h"
+
 enum stf_port_num {
 	STF_PORT_DVP = 0,
 	STF_PORT_CSI2RX
@@ -49,6 +51,7 @@ struct stfcamss {
 	struct media_device media_dev;
 	struct media_pipeline pipe;
 	struct device *dev;
+	struct stf_isp_dev isp_dev;
 	struct v4l2_async_notifier notifier;
 	void __iomem *syscon_base;
 	void __iomem *isp_base;

drivers/staging/media/starfive/camss/stf-isp.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * stf_isp.c
+ *
+ * StarFive Camera Subsystem - ISP Module
+ *
+ * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
+ */
+#include <media/v4l2-rect.h>
+
+#include "stf-camss.h"
+
+#define SINK_FORMATS_INDEX	0
+#define SOURCE_FORMATS_INDEX	1
+
+static int isp_set_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state,
+			     struct v4l2_subdev_selection *sel);
+
+static const struct stf_isp_format isp_formats_sink[] = {
+	{ MEDIA_BUS_FMT_SRGGB10_1X10, 10 },
+	{ MEDIA_BUS_FMT_SGRBG10_1X10, 10 },
+	{ MEDIA_BUS_FMT_SGBRG10_1X10, 10 },
+	{ MEDIA_BUS_FMT_SBGGR10_1X10, 10 },
+};
+
+static const struct stf_isp_format isp_formats_source[] = {
+	{ MEDIA_BUS_FMT_YUYV8_1_5X8, 8 },
+};
+
+static const struct stf_isp_format_table isp_formats_st7110[] = {
+	{ isp_formats_sink, ARRAY_SIZE(isp_formats_sink) },
+	{ isp_formats_source, ARRAY_SIZE(isp_formats_source) },
+};
+
+static const struct stf_isp_format *
+stf_g_fmt_by_mcode(const struct stf_isp_format_table *fmt_table, u32 mcode)
+{
+	unsigned int i;
+
+	for (i = 0; i < fmt_table->nfmts; i++) {
+		if (fmt_table->fmts[i].code == mcode)
+			return &fmt_table->fmts[i];
+	}
+
+	return NULL;
+}
+
+int stf_isp_init(struct stfcamss *stfcamss)
+{
+	struct stf_isp_dev *isp_dev = &stfcamss->isp_dev;
+
+	isp_dev->stfcamss = stfcamss;
+	isp_dev->formats = isp_formats_st7110;
+	isp_dev->nformats = ARRAY_SIZE(isp_formats_st7110);
+	isp_dev->current_fmt = &isp_formats_source[0];
+
+	return 0;
+}
+
+static int isp_set_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct stf_isp_dev *isp_dev = v4l2_get_subdevdata(sd);
+	struct v4l2_subdev_state *sd_state;
+	struct v4l2_mbus_framefmt *fmt;
+	struct v4l2_rect *crop;
+
+	sd_state = v4l2_subdev_lock_and_get_active_state(sd);
+	fmt = v4l2_subdev_get_pad_format(sd, sd_state, STF_ISP_PAD_SINK);
+	crop = v4l2_subdev_get_pad_crop(sd, sd_state, STF_ISP_PAD_SRC);
+
+	if (enable) {
+		stf_isp_reset(isp_dev);
+		stf_isp_init_cfg(isp_dev);
+		stf_isp_settings(isp_dev, crop, fmt->code);
+		stf_isp_stream_set(isp_dev);
+	}
+
+	v4l2_subdev_call(isp_dev->source_subdev, video, s_stream, enable);
+
+	v4l2_subdev_unlock_state(sd_state);
+	return 0;
+}
+
+static void isp_try_format(struct stf_isp_dev *isp_dev,
+			   struct v4l2_subdev_state *state,
+			   unsigned int pad,
+			   struct v4l2_mbus_framefmt *fmt)
+{
+	const struct stf_isp_format_table *formats;
+
+	if (pad >= STF_ISP_PAD_MAX) {
+		fmt->colorspace = V4L2_COLORSPACE_SRGB;
+		return;
+	}
+
+	if (pad == STF_ISP_PAD_SINK)
+		formats = &isp_dev->formats[SINK_FORMATS_INDEX];
+	else if (pad == STF_ISP_PAD_SRC)
+		formats = &isp_dev->formats[SOURCE_FORMATS_INDEX];
+
+	fmt->width = clamp_t(u32, fmt->width, STFCAMSS_FRAME_MIN_WIDTH,
+			     STFCAMSS_FRAME_MAX_WIDTH);
+	fmt->height = clamp_t(u32, fmt->height, STFCAMSS_FRAME_MIN_HEIGHT,
+			      STFCAMSS_FRAME_MAX_HEIGHT);
+	fmt->height &= ~0x1;
+	fmt->field = V4L2_FIELD_NONE;
+	fmt->colorspace = V4L2_COLORSPACE_SRGB;
+	fmt->flags = 0;
+
+	if (!stf_g_fmt_by_mcode(formats, fmt->code))
+		fmt->code = formats->fmts[0].code;
+}
+
+static int isp_enum_mbus_code(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_state *state,
+			      struct v4l2_subdev_mbus_code_enum *code)
+{
+	struct stf_isp_dev *isp_dev = v4l2_get_subdevdata(sd);
+	const struct stf_isp_format_table *formats;
+
+	if (code->pad == STF_ISP_PAD_SINK) {
+		if (code->index > ARRAY_SIZE(isp_formats_sink))
+			return -EINVAL;
+
+		formats = &isp_dev->formats[SINK_FORMATS_INDEX];
+		code->code = formats->fmts[code->index].code;
+	} else {
+		struct v4l2_mbus_framefmt *sink_fmt;
+
+		if (code->index > ARRAY_SIZE(isp_formats_source))
+			return -EINVAL;
+
+		sink_fmt = v4l2_subdev_get_pad_format(sd, state,
+						      STF_ISP_PAD_SRC);
+
+		code->code = sink_fmt->code;
+		if (!code->code)
+			return -EINVAL;
+	}
+	code->flags = 0;
+
+	return 0;
+}
+
+static int isp_set_format(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_state *state,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct stf_isp_dev *isp_dev = v4l2_get_subdevdata(sd);
+	struct v4l2_mbus_framefmt *format;
+
+	format = v4l2_subdev_get_pad_format(sd, state, fmt->pad);
+	if (!format)
+		return -EINVAL;
+
+	isp_try_format(isp_dev, state, fmt->pad, &fmt->format);
+	*format = fmt->format;
+
+	isp_dev->current_fmt = stf_g_fmt_by_mcode(&isp_dev->formats[fmt->pad],
+						  fmt->format.code);
+
+	/* Propagate to in crop */
+	if (fmt->pad == STF_ISP_PAD_SINK) {
+		struct v4l2_subdev_selection sel = { 0 };
+
+		/* Reset sink pad compose selection */
+		sel.which = fmt->which;
+		sel.pad = STF_ISP_PAD_SINK;
+		sel.target = V4L2_SEL_TGT_CROP;
+		sel.r.width = fmt->format.width;
+		sel.r.height = fmt->format.height;
+		isp_set_selection(sd, state, &sel);
+	}
+
+	return 0;
+}
+
+static const struct v4l2_rect stf_frame_min_crop = {
+	.width = STFCAMSS_FRAME_MIN_WIDTH,
+	.height = STFCAMSS_FRAME_MIN_HEIGHT,
+	.top = 0,
+	.left = 0,
+};
+
+static void isp_try_crop(struct stf_isp_dev *isp_dev,
+			 struct v4l2_subdev_state *state,
+			 struct v4l2_rect *crop)
+{
+	struct v4l2_mbus_framefmt *fmt =
+		v4l2_subdev_get_pad_format(&isp_dev->subdev, state,
+					   STF_ISP_PAD_SINK);
+
+	const struct v4l2_rect bounds = {
+		.width = fmt->width,
+		.height = fmt->height,
+		.left = 0,
+		.top = 0,
+	};
+
+	v4l2_rect_set_min_size(crop, &stf_frame_min_crop);
+	v4l2_rect_map_inside(crop, &bounds);
+}
+
+static int isp_get_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state,
+			     struct v4l2_subdev_selection *sel)
+{
+	struct v4l2_subdev_format fmt = { 0 };
+	struct v4l2_rect *rect;
+
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP_BOUNDS:
+		if (sel->pad == STF_ISP_PAD_SINK) {
+			fmt.format = *v4l2_subdev_get_pad_format(sd, state,
+								 sel->pad);
+			sel->r.left = 0;
+			sel->r.top = 0;
+			sel->r.width = fmt.format.width;
+			sel->r.height = fmt.format.height;
+		} else if (sel->pad == STF_ISP_PAD_SRC) {
+			rect = v4l2_subdev_get_pad_crop(sd, state, sel->pad);
+			sel->r = *rect;
+		}
+		break;
+
+	case V4L2_SEL_TGT_CROP:
+		rect = v4l2_subdev_get_pad_crop(sd, state, sel->pad);
+		if (!rect)
+			return -EINVAL;
+
+		sel->r = *rect;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int isp_set_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_state *state,
+			     struct v4l2_subdev_selection *sel)
+{
+	struct stf_isp_dev *isp_dev = v4l2_get_subdevdata(sd);
+	struct v4l2_rect *rect;
+
+	if (sel->target != V4L2_SEL_TGT_CROP)
+		return -EINVAL;
+
+	if (sel->target == V4L2_SEL_TGT_CROP &&
+	    sel->pad == STF_ISP_PAD_SINK) {
+		struct v4l2_subdev_selection crop = { 0 };
+
+		rect = v4l2_subdev_get_pad_crop(sd, state, sel->pad);
+		if (!rect)
+			return -EINVAL;
+
+		isp_try_crop(isp_dev, state, &sel->r);
+		*rect = sel->r;
+
+		/* Reset source crop selection */
+		crop.which = sel->which;
+		crop.pad = STF_ISP_PAD_SRC;
+		crop.target = V4L2_SEL_TGT_CROP;
+		crop.r = *rect;
+		isp_set_selection(sd, state, &crop);
+	} else if (sel->target == V4L2_SEL_TGT_CROP &&
+		   sel->pad == STF_ISP_PAD_SRC) {
+		struct v4l2_subdev_format fmt = { 0 };
+
+		rect = v4l2_subdev_get_pad_crop(sd, state, sel->pad);
+		if (!rect)
+			return -EINVAL;
+
+		isp_try_crop(isp_dev, state, &sel->r);
+		*rect = sel->r;
+
+		/* Reset source pad format width and height */
+		fmt.which = sel->which;
+		fmt.pad = STF_ISP_PAD_SRC;
+		fmt.format.width = rect->width;
+		fmt.format.height = rect->height;
+		isp_set_format(sd, state, &fmt);
+	}
+
+	dev_dbg(isp_dev->stfcamss->dev, "pad: %d sel(%d,%d)/%dx%d\n",
+		sel->pad, sel->r.left, sel->r.top, sel->r.width, sel->r.height);
+
+	return 0;
+}
+
+static int isp_init_formats(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_subdev_format format = {
+		.pad = STF_ISP_PAD_SINK,
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+		.format = {
+			.code = MEDIA_BUS_FMT_SRGGB10_1X10,
+			.width = 1920,
+			.height = 1080
+		}
+	};
+
+	return isp_set_format(sd, sd_state, &format);
+}
+
+static const struct v4l2_subdev_video_ops isp_video_ops = {
+	.s_stream = isp_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops isp_pad_ops = {
+	.init_cfg = isp_init_formats,
+	.enum_mbus_code = isp_enum_mbus_code,
+	.get_fmt = v4l2_subdev_get_fmt,
+	.set_fmt = isp_set_format,
+	.get_selection = isp_get_selection,
+	.set_selection = isp_set_selection,
+};
+
+static const struct v4l2_subdev_ops isp_v4l2_ops = {
+	.video = &isp_video_ops,
+	.pad = &isp_pad_ops,
+};
+
+static const struct media_entity_operations isp_media_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+int stf_isp_register(struct stf_isp_dev *isp_dev, struct v4l2_device *v4l2_dev)
+{
+	struct v4l2_subdev *sd = &isp_dev->subdev;
+	struct media_pad *pads = isp_dev->pads;
+	int ret;
+
+	v4l2_subdev_init(sd, &isp_v4l2_ops);
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	snprintf(sd->name, ARRAY_SIZE(sd->name), "stf_isp");
+	v4l2_set_subdevdata(sd, isp_dev);
+
+	pads[STF_ISP_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+	pads[STF_ISP_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE;
+
+	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_ISP;
+	sd->entity.ops = &isp_media_ops;
+	ret = media_entity_pads_init(&sd->entity, STF_ISP_PAD_MAX, pads);
+	if (ret) {
+		dev_err(isp_dev->stfcamss->dev,
+			"Failed to init media entity: %d\n", ret);
+		return ret;
+	}
+
+	ret = v4l2_subdev_init_finalize(sd);
+	if (ret)
+		goto err_entity_cleanup;
+
+	ret = v4l2_device_register_subdev(v4l2_dev, sd);
+	if (ret) {
+		dev_err(isp_dev->stfcamss->dev,
+			"Failed to register subdev: %d\n", ret);
+		goto err_subdev_cleanup;
+	}
+
+	return 0;
+
+err_subdev_cleanup:
+	v4l2_subdev_cleanup(sd);
+err_entity_cleanup:
+	media_entity_cleanup(&sd->entity);
+	return ret;
+}
+
+int stf_isp_unregister(struct stf_isp_dev *isp_dev)
+{
+	v4l2_device_unregister_subdev(&isp_dev->subdev);
+	v4l2_subdev_cleanup(&isp_dev->subdev);
+	media_entity_cleanup(&isp_dev->subdev.entity);
+
+	return 0;
+}