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509 lines
15 KiB
509 lines
15 KiB
/* |
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* Copyright (c) 2006-2009 Red Hat Inc. |
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* Copyright (c) 2006-2008 Intel Corporation |
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* Copyright (c) 2007 Dave Airlie <[email protected]> |
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* |
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* DRM framebuffer helper functions |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and its |
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* documentation for any purpose is hereby granted without fee, provided that |
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* the above copyright notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting documentation, and |
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* that the name of the copyright holders not be used in advertising or |
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* publicity pertaining to distribution of the software without specific, |
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* written prior permission. The copyright holders make no representations |
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* about the suitability of this software for any purpose. It is provided "as |
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* is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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* |
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* Authors: |
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* Dave Airlie <[email protected]> |
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* Jesse Barnes <[email protected]> |
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*/ |
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#ifndef DRM_FB_HELPER_H |
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#define DRM_FB_HELPER_H |
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struct drm_fb_helper; |
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#include <drm/drm_crtc.h> |
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#include <linux/kgdb.h> |
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enum mode_set_atomic { |
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LEAVE_ATOMIC_MODE_SET, |
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ENTER_ATOMIC_MODE_SET, |
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}; |
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struct drm_fb_offset { |
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int x, y; |
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}; |
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struct drm_fb_helper_crtc { |
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struct drm_mode_set mode_set; |
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struct drm_display_mode *desired_mode; |
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int x, y; |
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}; |
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/** |
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* struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size |
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* @fb_width: fbdev width |
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* @fb_height: fbdev height |
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* @surface_width: scanout buffer width |
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* @surface_height: scanout buffer height |
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* @surface_bpp: scanout buffer bpp |
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* @surface_depth: scanout buffer depth |
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* |
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* Note that the scanout surface width/height may be larger than the fbdev |
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* width/height. In case of multiple displays, the scanout surface is sized |
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* according to the largest width/height (so it is large enough for all CRTCs |
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* to scanout). But the fbdev width/height is sized to the minimum width/ |
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* height of all the displays. This ensures that fbcon fits on the smallest |
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* of the attached displays. |
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* |
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* So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height, |
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* rather than the surface size. |
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*/ |
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struct drm_fb_helper_surface_size { |
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u32 fb_width; |
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u32 fb_height; |
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u32 surface_width; |
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u32 surface_height; |
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u32 surface_bpp; |
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u32 surface_depth; |
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}; |
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/** |
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* struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library |
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* |
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* Driver callbacks used by the fbdev emulation helper library. |
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*/ |
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struct drm_fb_helper_funcs { |
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/** |
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* @gamma_set: |
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* |
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* Set the given gamma LUT register on the given CRTC. |
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* |
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* This callback is optional. |
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* |
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* FIXME: |
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* |
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* This callback is functionally redundant with the core gamma table |
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* support and simply exists because the fbdev hasn't yet been |
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* refactored to use the core gamma table interfaces. |
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*/ |
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void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green, |
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u16 blue, int regno); |
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/** |
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* @gamma_get: |
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* |
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* Read the given gamma LUT register on the given CRTC, used to save the |
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* current LUT when force-restoring the fbdev for e.g. kdbg. |
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* |
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* This callback is optional. |
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* |
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* FIXME: |
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* |
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* This callback is functionally redundant with the core gamma table |
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* support and simply exists because the fbdev hasn't yet been |
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* refactored to use the core gamma table interfaces. |
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*/ |
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void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green, |
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u16 *blue, int regno); |
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/** |
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* @fb_probe: |
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* |
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* Driver callback to allocate and initialize the fbdev info structure. |
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* Furthermore it also needs to allocate the DRM framebuffer used to |
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* back the fbdev. |
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* |
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* This callback is mandatory. |
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* |
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* RETURNS: |
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* |
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* The driver should return 0 on success and a negative error code on |
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* failure. |
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*/ |
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int (*fb_probe)(struct drm_fb_helper *helper, |
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struct drm_fb_helper_surface_size *sizes); |
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/** |
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* @initial_config: |
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* |
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* Driver callback to setup an initial fbdev display configuration. |
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* Drivers can use this callback to tell the fbdev emulation what the |
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* preferred initial configuration is. This is useful to implement |
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* smooth booting where the fbdev (and subsequently all userspace) never |
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* changes the mode, but always inherits the existing configuration. |
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* |
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* This callback is optional. |
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* |
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* RETURNS: |
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* |
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* The driver should return true if a suitable initial configuration has |
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* been filled out and false when the fbdev helper should fall back to |
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* the default probing logic. |
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*/ |
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bool (*initial_config)(struct drm_fb_helper *fb_helper, |
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struct drm_fb_helper_crtc **crtcs, |
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struct drm_display_mode **modes, |
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struct drm_fb_offset *offsets, |
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bool *enabled, int width, int height); |
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}; |
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struct drm_fb_helper_connector { |
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struct drm_connector *connector; |
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}; |
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/** |
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* struct drm_fb_helper - main structure to emulate fbdev on top of KMS |
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* @fb: Scanout framebuffer object |
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* @dev: DRM device |
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* @crtc_count: number of possible CRTCs |
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* @crtc_info: per-CRTC helper state (mode, x/y offset, etc) |
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* @connector_count: number of connected connectors |
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* @connector_info_alloc_count: size of connector_info |
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* @connector_info: array of per-connector information |
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* @funcs: driver callbacks for fb helper |
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* @fbdev: emulated fbdev device info struct |
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* @pseudo_palette: fake palette of 16 colors |
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* @dirty_clip: clip rectangle used with deferred_io to accumulate damage to |
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* the screen buffer |
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* @dirty_lock: spinlock protecting @dirty_clip |
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* @dirty_work: worker used to flush the framebuffer |
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* @resume_work: worker used during resume if the console lock is already taken |
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* |
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* This is the main structure used by the fbdev helpers. Drivers supporting |
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* fbdev emulation should embedded this into their overall driver structure. |
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* Drivers must also fill out a struct &drm_fb_helper_funcs with a few |
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* operations. |
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*/ |
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struct drm_fb_helper { |
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struct drm_framebuffer *fb; |
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struct drm_device *dev; |
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int crtc_count; |
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struct drm_fb_helper_crtc *crtc_info; |
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int connector_count; |
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int connector_info_alloc_count; |
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struct drm_fb_helper_connector **connector_info; |
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const struct drm_fb_helper_funcs *funcs; |
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struct fb_info *fbdev; |
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u32 pseudo_palette[17]; |
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struct drm_clip_rect dirty_clip; |
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spinlock_t dirty_lock; |
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struct work_struct dirty_work; |
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struct work_struct resume_work; |
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/** |
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* @kernel_fb_list: |
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* |
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* Entry on the global kernel_fb_helper_list, used for kgdb entry/exit. |
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*/ |
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struct list_head kernel_fb_list; |
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/** |
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* @delayed_hotplug: |
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* |
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* A hotplug was received while fbdev wasn't in control of the DRM |
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* device, i.e. another KMS master was active. The output configuration |
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* needs to be reprobe when fbdev is in control again. |
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*/ |
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bool delayed_hotplug; |
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}; |
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/** |
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* define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers |
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* |
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* Helper define to register default implementations of drm_fb_helper |
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* functions. To be used in struct fb_ops of drm drivers. |
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*/ |
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#define DRM_FB_HELPER_DEFAULT_OPS \ |
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.fb_check_var = drm_fb_helper_check_var, \ |
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.fb_set_par = drm_fb_helper_set_par, \ |
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.fb_setcmap = drm_fb_helper_setcmap, \ |
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.fb_blank = drm_fb_helper_blank, \ |
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.fb_pan_display = drm_fb_helper_pan_display |
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#ifdef CONFIG_DRM_FBDEV_EMULATION |
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void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, |
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const struct drm_fb_helper_funcs *funcs); |
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int drm_fb_helper_init(struct drm_device *dev, |
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struct drm_fb_helper *helper, int crtc_count, |
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int max_conn); |
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void drm_fb_helper_fini(struct drm_fb_helper *helper); |
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int drm_fb_helper_blank(int blank, struct fb_info *info); |
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int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, |
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struct fb_info *info); |
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int drm_fb_helper_set_par(struct fb_info *info); |
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int drm_fb_helper_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info); |
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int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper); |
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struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper); |
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void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper); |
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void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper); |
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void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, |
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uint32_t fb_width, uint32_t fb_height); |
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void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, |
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uint32_t depth); |
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void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); |
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void drm_fb_helper_deferred_io(struct fb_info *info, |
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struct list_head *pagelist); |
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ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, |
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size_t count, loff_t *ppos); |
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ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, |
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size_t count, loff_t *ppos); |
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void drm_fb_helper_sys_fillrect(struct fb_info *info, |
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const struct fb_fillrect *rect); |
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void drm_fb_helper_sys_copyarea(struct fb_info *info, |
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const struct fb_copyarea *area); |
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void drm_fb_helper_sys_imageblit(struct fb_info *info, |
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const struct fb_image *image); |
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void drm_fb_helper_cfb_fillrect(struct fb_info *info, |
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const struct fb_fillrect *rect); |
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void drm_fb_helper_cfb_copyarea(struct fb_info *info, |
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const struct fb_copyarea *area); |
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void drm_fb_helper_cfb_imageblit(struct fb_info *info, |
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const struct fb_image *image); |
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void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); |
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void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, |
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bool suspend); |
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int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info); |
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int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper); |
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int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel); |
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int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper); |
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int drm_fb_helper_debug_enter(struct fb_info *info); |
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int drm_fb_helper_debug_leave(struct fb_info *info); |
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struct drm_display_mode * |
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drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, |
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int width, int height); |
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struct drm_display_mode * |
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drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, |
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int width, int height); |
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int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector); |
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int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, |
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struct drm_connector *connector); |
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#else |
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static inline void drm_fb_helper_prepare(struct drm_device *dev, |
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struct drm_fb_helper *helper, |
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const struct drm_fb_helper_funcs *funcs) |
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{ |
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} |
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static inline int drm_fb_helper_init(struct drm_device *dev, |
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struct drm_fb_helper *helper, int crtc_count, |
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int max_conn) |
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{ |
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return 0; |
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} |
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static inline void drm_fb_helper_fini(struct drm_fb_helper *helper) |
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{ |
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} |
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static inline int drm_fb_helper_blank(int blank, struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_set_par(struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline int |
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drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) |
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{ |
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return 0; |
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} |
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static inline struct fb_info * |
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drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) |
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{ |
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return NULL; |
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} |
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static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) |
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{ |
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} |
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static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) |
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{ |
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} |
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static inline void drm_fb_helper_fill_var(struct fb_info *info, |
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struct drm_fb_helper *fb_helper, |
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uint32_t fb_width, uint32_t fb_height) |
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{ |
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} |
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static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, |
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uint32_t depth) |
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{ |
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} |
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static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap, |
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struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) |
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{ |
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} |
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static inline void drm_fb_helper_deferred_io(struct fb_info *info, |
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struct list_head *pagelist) |
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{ |
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} |
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static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, |
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char __user *buf, size_t count, |
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loff_t *ppos) |
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{ |
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return -ENODEV; |
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} |
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static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info, |
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const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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return -ENODEV; |
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} |
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static inline void drm_fb_helper_sys_fillrect(struct fb_info *info, |
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const struct fb_fillrect *rect) |
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{ |
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} |
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static inline void drm_fb_helper_sys_copyarea(struct fb_info *info, |
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const struct fb_copyarea *area) |
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{ |
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} |
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static inline void drm_fb_helper_sys_imageblit(struct fb_info *info, |
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const struct fb_image *image) |
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{ |
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} |
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static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, |
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const struct fb_fillrect *rect) |
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{ |
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} |
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static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, |
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const struct fb_copyarea *area) |
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{ |
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} |
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static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, |
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const struct fb_image *image) |
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{ |
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} |
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static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, |
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bool suspend) |
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{ |
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} |
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static inline void |
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drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend) |
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{ |
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} |
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static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, |
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int bpp_sel) |
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{ |
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return 0; |
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} |
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static inline int |
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drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_debug_enter(struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline int drm_fb_helper_debug_leave(struct fb_info *info) |
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{ |
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return 0; |
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} |
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static inline struct drm_display_mode * |
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drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, |
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int width, int height) |
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{ |
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return NULL; |
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} |
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static inline struct drm_display_mode * |
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drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, |
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int width, int height) |
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{ |
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return NULL; |
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} |
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static inline int |
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drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, |
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struct drm_connector *connector) |
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{ |
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return 0; |
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} |
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static inline int |
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drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, |
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struct drm_connector *connector) |
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{ |
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return 0; |
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} |
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#endif |
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static inline int |
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drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a, |
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const char *name, bool primary) |
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{ |
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#if IS_REACHABLE(CONFIG_FB) |
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return remove_conflicting_framebuffers(a, name, primary); |
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#else |
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return 0; |
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#endif |
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} |
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#endif
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