drivers/gpu/drm/msm/msm_fbdev.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/msm/msm_fbdev.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/msm/msm_fbdev.c
Extension
.c
Size
3915 bytes
Lines
156
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-only
/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/fb.h>

#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_prime.h>

#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_kms.h"

static bool fbdev = true;
MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
module_param(fbdev, bool, 0600);

/*
 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
 */

FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
				   drm_fb_helper_damage_range,
				   drm_fb_helper_damage_area)

static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
	struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);

	return drm_gem_prime_mmap(bo, vma);
}

static void msm_fbdev_fb_destroy(struct fb_info *info)
{
	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
	struct drm_framebuffer *fb = helper->fb;
	struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0);

	DBG();

	drm_fb_helper_fini(helper);

	/* this will free the backing object */
	msm_gem_put_vaddr(bo);
	drm_framebuffer_remove(fb);

	drm_client_release(&helper->client);
}

static const struct fb_ops msm_fb_ops = {
	.owner = THIS_MODULE,
	__FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
	DRM_FB_HELPER_DEFAULT_OPS,
	__FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
	.fb_mmap = msm_fbdev_mmap,
	.fb_destroy = msm_fbdev_fb_destroy,
};

static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
			      struct drm_clip_rect *clip)
{
	struct drm_device *dev = helper->dev;
	int ret;

	/* Call damage handlers only if necessary */
	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
		return 0;

	if (helper->fb->funcs->dirty) {
		ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
		if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
			return ret;
	}

	return 0;
}

static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
	.fb_dirty = msm_fbdev_fb_dirty,
};

int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
				 struct drm_fb_helper_surface_size *sizes)

Annotation

Implementation Notes