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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/imx/dcss/dcss-crtc.c
Extension
.c
Size
6251 bytes
Lines
223
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/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_vblank.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

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

static int dcss_enable_vblank(struct drm_crtc *crtc)
{
	struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
						   base);
	struct dcss_dev *dcss = crtc->dev->dev_private;

	dcss_dtg_vblank_irq_enable(dcss->dtg, true);

	dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);

	enable_irq(dcss_crtc->irq);

	return 0;
}

static void dcss_disable_vblank(struct drm_crtc *crtc)
{
	struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
						   base);
	struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;

	disable_irq_nosync(dcss_crtc->irq);

	dcss_dtg_vblank_irq_enable(dcss->dtg, false);

	if (dcss_crtc->disable_ctxld_kick_irq)
		dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false);
}

static const struct drm_crtc_funcs dcss_crtc_funcs = {
	.set_config = drm_atomic_helper_set_config,
	.destroy = drm_crtc_cleanup,
	.page_flip = drm_atomic_helper_page_flip,
	.reset = drm_atomic_helper_crtc_reset,
	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
	.enable_vblank = dcss_enable_vblank,
	.disable_vblank = dcss_disable_vblank,
};

static void dcss_crtc_atomic_begin(struct drm_crtc *crtc,
				   struct drm_atomic_commit *state)
{
	drm_crtc_vblank_on(crtc);
}

static void dcss_crtc_atomic_flush(struct drm_crtc *crtc,
				   struct drm_atomic_commit *state)
{
	struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
						   base);
	struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;

	spin_lock_irq(&crtc->dev->event_lock);
	if (crtc->state->event) {
		WARN_ON(drm_crtc_vblank_get(crtc));
		drm_crtc_arm_vblank_event(crtc, crtc->state->event);
		crtc->state->event = NULL;
	}
	spin_unlock_irq(&crtc->dev->event_lock);

	if (dcss_dtg_is_enabled(dcss->dtg))
		dcss_ctxld_enable(dcss->ctxld);
}

static void dcss_crtc_atomic_enable(struct drm_crtc *crtc,
				    struct drm_atomic_commit *state)
{
	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
									      crtc);
	struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
						   base);
	struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
	struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
	struct videomode vm;

Annotation

Implementation Notes