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.
- 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.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
drm/clients/drm_client_setup.hdrm/drm_atomic.hdrm/drm_atomic_helper.hdrm/drm_bridge.hdrm/drm_bridge_connector.hdrm/drm_drv.hdrm/drm_fbdev_dma.hdrm/drm_gem_dma_helper.hdrm/drm_gem_framebuffer_helper.hdrm/drm_of.hdrm/drm_probe_helper.hdrm/drm_vblank.hdcss-dev.hdcss-kms.h
Detected Declarations
function dcss_kms_mode_config_initfunction dcss_kms_bridge_connector_initfunction dcss_kms_detachfunction dcss_kms_shutdown
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
- Immediate include surface: `drm/clients/drm_client_setup.h`, `drm/drm_atomic.h`, `drm/drm_atomic_helper.h`, `drm/drm_bridge.h`, `drm/drm_bridge_connector.h`, `drm/drm_drv.h`, `drm/drm_fbdev_dma.h`, `drm/drm_gem_dma_helper.h`.
- Detected declarations: `function dcss_kms_mode_config_init`, `function dcss_kms_bridge_connector_init`, `function dcss_kms_detach`, `function dcss_kms_shutdown`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.