linux-imx

/*

 * Copyright (c) 2006-2009 Red Hat Inc.

 * Copyright (c) 2006-2008 Intel Corporation

 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>

 *

 * DRM framebuffer helper functions

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting documentation, and

 * that the name of the copyright holders not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  The copyright holders make no representations

 * about the suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 *

 * Authors:

 *      Dave Airlie <airlied@linux.ie>

 *      Jesse Barnes <jesse.barnes@intel.com>

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/console.h>

#include <linux/dma-buf.h>

#include <linux/kernel.h>

#include <linux/sysrq.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <drm/drmP.h>

#include <drm/drm_crtc.h>

#include <drm/drm_fb_helper.h>

#include <drm/drm_crtc_helper.h>

#include <drm/drm_atomic.h>

#include <drm/drm_atomic_helper.h>

​

#include "drm_crtc_internal.h"

#include "drm_crtc_helper_internal.h"

​

static bool drm_fbdev_emulation = true;

module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);

MODULE_PARM_DESC(fbdev_emulation,

         "Enable legacy fbdev emulation [default=true]");

​

static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;

module_param(drm_fbdev_overalloc, int, 0444);

MODULE_PARM_DESC(drm_fbdev_overalloc,

         "Overallocation of the fbdev buffer (%) [default="

         __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");

​

/*

 * In order to keep user-space compatibility, we want in certain use-cases

 * to keep leaking the fbdev physical address to the user-space program

 * handling the fbdev buffer.

 * This is a bad habit essentially kept into closed source opengl driver