drivers/gpu/drm/imx/dcss/dcss-kms.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/imx/dcss/dcss-kms.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/imx/dcss/dcss-kms.c
Extension
.c
Size
4163 bytes
Lines
182
Domain
Driver Families
Bucket
drivers/gpu
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 NXP.
 */

#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "dcss-dev.h"
#include "dcss-kms.h"

DEFINE_DRM_GEM_DMA_FOPS(dcss_cma_fops);

static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static const struct drm_driver dcss_kms_driver = {
	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
	DRM_GEM_DMA_DRIVER_OPS,
	DRM_FBDEV_DMA_DRIVER_OPS,
	.fops			= &dcss_cma_fops,
	.name			= "imx-dcss",
	.desc			= "i.MX8MQ Display Subsystem",
	.major			= 1,
	.minor			= 0,
	.patchlevel		= 0,
};

static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};

static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
{
	struct drm_mode_config *config = &kms->base.mode_config;

	drm_mode_config_init(&kms->base);

	config->min_width = 1;
	config->min_height = 1;
	config->max_width = 4096;
	config->max_height = 4096;
	config->normalize_zpos = true;

	config->funcs = &dcss_drm_mode_config_funcs;
	config->helper_private = &dcss_mode_config_helpers;
}

static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms)
{
	struct drm_device *ddev = &kms->base;
	struct drm_encoder *encoder = &kms->encoder;
	struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
	int ret;

	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
					  &panel, &bridge);
	if (ret)
		return ret;

	if (!bridge) {
		dev_err(ddev->dev, "No bridge found %d.\n", ret);
		return -ENODEV;
	}

	encoder->possible_crtcs = drm_crtc_mask(crtc);

	ret = drm_encoder_init(&kms->base, encoder,
			       &dcss_kms_simple_encoder_funcs,
			       DRM_MODE_ENCODER_NONE, NULL);
	if (ret) {

Annotation

Implementation Notes