drivers/media/platform/renesas/vsp1/vsp1_lif.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/renesas/vsp1/vsp1_lif.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/renesas/vsp1/vsp1_lif.c
Extension
.c
Size
4267 bytes
Lines
156
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/device.h>
#include <linux/gfp.h>

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_lif.h"

#define LIF_MIN_SIZE				2U
#define LIF_MAX_SIZE				8190U

/* -----------------------------------------------------------------------------
 * Device Access
 */

static inline void vsp1_lif_write(struct vsp1_lif *lif,
				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
	vsp1_dl_body_write(dlb, reg + lif->entity.index * VI6_LIF_OFFSET,
			       data);
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Operations
 */

static const unsigned int lif_codes[] = {
	MEDIA_BUS_FMT_ARGB8888_1X32,
	MEDIA_BUS_FMT_AYUV8_1X32,
};

static const struct v4l2_subdev_pad_ops lif_pad_ops = {
	.enum_mbus_code = vsp1_subdev_enum_mbus_code,
	.enum_frame_size = vsp1_subdev_enum_frame_size,
	.get_fmt = vsp1_subdev_get_pad_format,
	.set_fmt = vsp1_subdev_set_pad_format,
};

static const struct v4l2_subdev_ops lif_ops = {
	.pad    = &lif_pad_ops,
};

/* -----------------------------------------------------------------------------
 * VSP1 Entity Operations
 */

static void lif_configure_stream(struct vsp1_entity *entity,
				 struct v4l2_subdev_state *state,
				 struct vsp1_pipeline *pipe,
				 struct vsp1_dl_list *dl,
				 struct vsp1_dl_body *dlb)
{
	const struct v4l2_mbus_framefmt *format;
	struct vsp1_lif *lif = to_lif(&entity->subdev);
	unsigned int hbth;
	unsigned int obth;
	unsigned int lbth;

	format = v4l2_subdev_state_get_format(state, LIF_PAD_SOURCE);

	switch (entity->vsp1->version & VI6_IP_VERSION_MODEL_MASK) {
	case VI6_IP_VERSION_MODEL_VSPD_GEN2:
	case VI6_IP_VERSION_MODEL_VSPD_V2H:
		hbth = 1536;
		obth = min(128U, (format->width + 1) / 2 * format->height - 4);
		lbth = 1520;
		break;

	case VI6_IP_VERSION_MODEL_VSPDL_GEN3:
	case VI6_IP_VERSION_MODEL_VSPD_V3:
	case VI6_IP_VERSION_MODEL_VSPD_RZG2L:
		hbth = 0;
		obth = 1500;
		lbth = 0;
		break;

	case VI6_IP_VERSION_MODEL_VSPD_GEN3:
	case VI6_IP_VERSION_MODEL_VSPD_GEN4:
	default:
		hbth = 0;

Annotation

Implementation Notes