drivers/gpu/drm/omapdrm/omap_fbdev.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/omapdrm/omap_fbdev.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/omapdrm/omap_fbdev.c
Extension
.c
Size
7705 bytes
Lines
295
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

struct omap_fbdev {
	struct drm_device *dev;
	bool ywrap_enabled;

	/* for deferred dmm roll when getting called in atomic ctx */
	struct work_struct work;
};

static struct drm_fb_helper *get_fb(struct fb_info *fbi);

static void pan_worker(struct work_struct *work)
{
	struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
	struct drm_fb_helper *helper = fbdev->dev->fb_helper;
	struct fb_info *fbi = helper->info;
	struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0);
	int npages;

	/* DMM roll shifts in 4K pages: */
	npages = fbi->fix.line_length >> PAGE_SHIFT;
	omap_gem_roll(bo, fbi->var.yoffset * npages);
}

FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev,
				   drm_fb_helper_damage_range,
				   drm_fb_helper_damage_area)

static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
{
	struct drm_fb_helper *helper = get_fb(fbi);
	struct omap_drm_private *priv;
	struct omap_fbdev *fbdev;

	if (!helper)
		goto fallback;

	priv = helper->dev->dev_private;
	fbdev = priv->fbdev;

	if (!fbdev->ywrap_enabled)
		goto fallback;

	if (drm_can_sleep())
		pan_worker(&fbdev->work);
	else
		queue_work(priv->wq, &fbdev->work);

	return 0;

fallback:
	return drm_fb_helper_pan_display(var, fbi);
}

static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));

	return fb_deferred_io_mmap(info, vma);
}

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

	DBG();

	fb_deferred_io_cleanup(info);
	drm_fb_helper_fini(helper);

	omap_gem_unpin(bo);
	drm_framebuffer_remove(fb);

	drm_client_release(&helper->client);
}

/*
 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap()
 * because we use write-combine.
 */
static const struct fb_ops omap_fb_ops = {
	.owner = THIS_MODULE,
	__FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev),
	.fb_check_var	= drm_fb_helper_check_var,
	.fb_set_par	= drm_fb_helper_set_par,
	.fb_setcmap	= drm_fb_helper_setcmap,
	.fb_blank	= drm_fb_helper_blank,
	.fb_pan_display = omap_fbdev_pan_display,
	__FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev),

Annotation

Implementation Notes