drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c
Extension
.c
Size
2688 bytes
Lines
98
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
/*
 * Copyright 2019-2023 NXP
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/regmap.h>

#include <media/mipi-csi2.h>

#include "imx8-isi-core.h"

/* -----------------------------------------------------------------------------
 * i.MX8MN and i.MX8MP gasket
 */

#define GASKET_BASE(n)				(0x0060 + (n) * 0x30)

#define GASKET_CTRL				0x0000
#define GASKET_CTRL_DATA_TYPE(dt)		FIELD_PREP(GENMASK(13, 8), dt)
#define GASKET_CTRL_DUAL_COMP_ENABLE		BIT(1)
#define GASKET_CTRL_ENABLE			BIT(0)

#define GASKET_HSIZE				0x0004
#define GASKET_VSIZE				0x0008

static void mxc_imx8_gasket_enable(struct mxc_isi_dev *isi,
				   const struct v4l2_mbus_frame_desc *fd,
				   const struct v4l2_mbus_framefmt *fmt,
				   const unsigned int port)
{
	u32 val;

	regmap_write(isi->gasket, GASKET_BASE(port) + GASKET_HSIZE, fmt->width);
	regmap_write(isi->gasket, GASKET_BASE(port) + GASKET_VSIZE, fmt->height);

	val = GASKET_CTRL_DATA_TYPE(fd->entry[0].bus.csi2.dt);
	if (fd->entry[0].bus.csi2.dt == MIPI_CSI2_DT_YUV422_8B)
		val |= GASKET_CTRL_DUAL_COMP_ENABLE;

	val |= GASKET_CTRL_ENABLE;
	regmap_write(isi->gasket, GASKET_BASE(port) + GASKET_CTRL, val);
}

static void mxc_imx8_gasket_disable(struct mxc_isi_dev *isi,
				    const unsigned int port)
{
	regmap_write(isi->gasket, GASKET_BASE(port) + GASKET_CTRL, 0);
}

const struct mxc_gasket_ops mxc_imx8_gasket_ops = {
	.enable = mxc_imx8_gasket_enable,
	.disable = mxc_imx8_gasket_disable,
};

/* -----------------------------------------------------------------------------
 * i.MX93 gasket
 */

#define DISP_MIX_CAMERA_MUX			0x30
#define DISP_MIX_CAMERA_MUX_DATA_TYPE(x)	FIELD_PREP(GENMASK(8, 3), x)
#define DISP_MIX_CAMERA_MUX_GASKET_ENABLE	BIT(16)
#define DISP_MIX_CAMERA_MUX_GASKET_SOURCE_TYPE	BIT(17)

static void mxc_imx93_gasket_enable(struct mxc_isi_dev *isi,
				    const struct v4l2_mbus_frame_desc *fd,
				    const struct v4l2_mbus_framefmt *fmt,
				    const unsigned int port)
{
	u32 val;

	val = DISP_MIX_CAMERA_MUX_DATA_TYPE(fd->entry[0].bus.csi2.dt);
	val |= DISP_MIX_CAMERA_MUX_GASKET_ENABLE;

	/*
	 * CAMERA MUX
	 * - [17]:	Selects source input to gasket
	 *		0: Data from MIPI CSI
	 *		1: Data from parallel camera
	 */
	if (fd->type == V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL)
		val |= DISP_MIX_CAMERA_MUX_GASKET_SOURCE_TYPE;

	regmap_write(isi->gasket, DISP_MIX_CAMERA_MUX, val);
}

static void mxc_imx93_gasket_disable(struct mxc_isi_dev *isi,
				     unsigned int port)
{

Annotation

Implementation Notes