drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
Extension
.c
Size
5809 bytes
Lines
193
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-or-later
/*
 * Copyright 2015 Freescale Semiconductor, Inc.
 *
 * Freescale DCU drm device driver
 */

#include <linux/clk.h>
#include <linux/regmap.h>

#include <video/videomode.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "fsl_dcu_drm_crtc.h"
#include "fsl_dcu_drm_drv.h"
#include "fsl_dcu_drm_plane.h"

static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
					  struct drm_atomic_commit *state)
{
	struct drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
	struct drm_pending_vblank_event *event = crtc->state->event;

	regmap_write(fsl_dev->regmap,
		     DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);

	if (event) {
		crtc->state->event = NULL;

		spin_lock_irq(&crtc->dev->event_lock);
		if (drm_crtc_vblank_get(crtc) == 0)
			drm_crtc_arm_vblank_event(crtc, event);
		else
			drm_crtc_send_vblank_event(crtc, event);
		spin_unlock_irq(&crtc->dev->event_lock);
	}
}

static void fsl_dcu_drm_crtc_atomic_disable(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 drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;

	/* always disable planes on the CRTC */
	drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);

	drm_crtc_vblank_off(crtc);

	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
			   DCU_MODE_DCU_MODE_MASK,
			   DCU_MODE_DCU_MODE(DCU_MODE_OFF));
	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
		     DCU_UPDATE_MODE_READREG);
	clk_disable_unprepare(fsl_dev->pix_clk);
}

static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
					   struct drm_atomic_commit *state)
{
	struct drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;

	clk_prepare_enable(fsl_dev->pix_clk);
	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
			   DCU_MODE_DCU_MODE_MASK,
			   DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
		     DCU_UPDATE_MODE_READREG);

	drm_crtc_vblank_on(crtc);
}

static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
	struct drm_connector *con = &fsl_dev->connector.base;
	struct drm_display_mode *mode = &crtc->state->mode;
	unsigned int pol = 0;
	struct videomode vm;

Annotation

Implementation Notes