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213 lines
6.1 KiB
213 lines
6.1 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef DRM_GEM_VRAM_HELPER_H |
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#define DRM_GEM_VRAM_HELPER_H |
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#include <drm/drm_file.h> |
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#include <drm/drm_gem.h> |
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#include <drm/drm_ioctl.h> |
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#include <drm/drm_modes.h> |
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#include <drm/ttm/ttm_bo_api.h> |
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#include <drm/ttm/ttm_bo_driver.h> |
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#include <linux/dma-buf-map.h> |
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#include <linux/kernel.h> /* for container_of() */ |
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struct drm_mode_create_dumb; |
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struct drm_plane; |
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struct drm_plane_state; |
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struct drm_simple_display_pipe; |
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struct filp; |
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struct vm_area_struct; |
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#define DRM_GEM_VRAM_PL_FLAG_SYSTEM (1 << 0) |
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#define DRM_GEM_VRAM_PL_FLAG_VRAM (1 << 1) |
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#define DRM_GEM_VRAM_PL_FLAG_TOPDOWN (1 << 2) |
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/* |
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* Buffer-object helpers |
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*/ |
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/** |
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* struct drm_gem_vram_object - GEM object backed by VRAM |
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* @bo: TTM buffer object |
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* @map: Mapping information for @bo |
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* @placement: TTM placement information. Supported placements are \ |
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%TTM_PL_VRAM and %TTM_PL_SYSTEM |
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* @placements: TTM placement information. |
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* |
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* The type struct drm_gem_vram_object represents a GEM object that is |
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* backed by VRAM. It can be used for simple framebuffer devices with |
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* dedicated memory. The buffer object can be evicted to system memory if |
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* video memory becomes scarce. |
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* |
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* GEM VRAM objects perform reference counting for pin and mapping |
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* operations. So a buffer object that has been pinned N times with |
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* drm_gem_vram_pin() must be unpinned N times with |
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* drm_gem_vram_unpin(). The same applies to pairs of |
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* drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of |
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* drm_gem_vram_vmap() and drm_gem_vram_vunmap(). |
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*/ |
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struct drm_gem_vram_object { |
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struct ttm_buffer_object bo; |
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struct dma_buf_map map; |
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/** |
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* @vmap_use_count: |
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* |
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* Reference count on the virtual address. |
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* The address are un-mapped when the count reaches zero. |
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*/ |
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unsigned int vmap_use_count; |
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/* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */ |
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struct ttm_placement placement; |
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struct ttm_place placements[2]; |
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}; |
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/** |
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* drm_gem_vram_of_bo - Returns the container of type |
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* &struct drm_gem_vram_object for field bo. |
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* @bo: the VRAM buffer object |
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* Returns: The containing GEM VRAM object |
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*/ |
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static inline struct drm_gem_vram_object *drm_gem_vram_of_bo( |
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struct ttm_buffer_object *bo) |
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{ |
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return container_of(bo, struct drm_gem_vram_object, bo); |
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} |
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/** |
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* drm_gem_vram_of_gem - Returns the container of type |
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* &struct drm_gem_vram_object for field gem. |
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* @gem: the GEM object |
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* Returns: The containing GEM VRAM object |
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*/ |
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static inline struct drm_gem_vram_object *drm_gem_vram_of_gem( |
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struct drm_gem_object *gem) |
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{ |
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return container_of(gem, struct drm_gem_vram_object, bo.base); |
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} |
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struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev, |
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size_t size, |
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unsigned long pg_align); |
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void drm_gem_vram_put(struct drm_gem_vram_object *gbo); |
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u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo); |
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s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo); |
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int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag); |
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int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo); |
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int drm_gem_vram_vmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map); |
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void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map); |
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int drm_gem_vram_fill_create_dumb(struct drm_file *file, |
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struct drm_device *dev, |
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unsigned long pg_align, |
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unsigned long pitch_align, |
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struct drm_mode_create_dumb *args); |
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/* |
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* Helpers for struct drm_driver |
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*/ |
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int drm_gem_vram_driver_dumb_create(struct drm_file *file, |
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struct drm_device *dev, |
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struct drm_mode_create_dumb *args); |
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int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file, |
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struct drm_device *dev, |
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uint32_t handle, uint64_t *offset); |
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/* |
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* Helpers for struct drm_plane_helper_funcs |
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*/ |
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int |
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drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane, |
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struct drm_plane_state *new_state); |
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void |
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drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane, |
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struct drm_plane_state *old_state); |
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/* |
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* Helpers for struct drm_simple_display_pipe_funcs |
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*/ |
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int drm_gem_vram_simple_display_pipe_prepare_fb( |
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struct drm_simple_display_pipe *pipe, |
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struct drm_plane_state *new_state); |
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void drm_gem_vram_simple_display_pipe_cleanup_fb( |
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struct drm_simple_display_pipe *pipe, |
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struct drm_plane_state *old_state); |
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/** |
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* define DRM_GEM_VRAM_DRIVER - default callback functions for \ |
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&struct drm_driver |
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* |
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* Drivers that use VRAM MM and GEM VRAM can use this macro to initialize |
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* &struct drm_driver with default functions. |
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*/ |
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#define DRM_GEM_VRAM_DRIVER \ |
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.debugfs_init = drm_vram_mm_debugfs_init, \ |
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.dumb_create = drm_gem_vram_driver_dumb_create, \ |
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.dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \ |
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.gem_prime_mmap = drm_gem_prime_mmap |
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/* |
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* VRAM memory manager |
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*/ |
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/** |
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* struct drm_vram_mm - An instance of VRAM MM |
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* @vram_base: Base address of the managed video memory |
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* @vram_size: Size of the managed video memory in bytes |
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* @bdev: The TTM BO device. |
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* @funcs: TTM BO functions |
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* |
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* The fields &struct drm_vram_mm.vram_base and |
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* &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are |
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* available for public read access. Use the field |
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* &struct drm_vram_mm.bdev to access the TTM BO device. |
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*/ |
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struct drm_vram_mm { |
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uint64_t vram_base; |
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size_t vram_size; |
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struct ttm_bo_device bdev; |
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}; |
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/** |
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* drm_vram_mm_of_bdev() - \ |
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Returns the container of type &struct ttm_bo_device for field bdev. |
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* @bdev: the TTM BO device |
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* |
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* Returns: |
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* The containing instance of &struct drm_vram_mm |
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*/ |
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static inline struct drm_vram_mm *drm_vram_mm_of_bdev( |
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struct ttm_bo_device *bdev) |
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{ |
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return container_of(bdev, struct drm_vram_mm, bdev); |
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} |
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void drm_vram_mm_debugfs_init(struct drm_minor *minor); |
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/* |
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* Helpers for integration with struct drm_device |
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*/ |
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struct drm_vram_mm *drm_vram_helper_alloc_mm( |
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struct drm_device *dev, uint64_t vram_base, size_t vram_size); |
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void drm_vram_helper_release_mm(struct drm_device *dev); |
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int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base, |
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size_t vram_size); |
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/* |
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* Mode-config helpers |
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*/ |
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enum drm_mode_status |
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drm_vram_helper_mode_valid(struct drm_device *dev, |
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const struct drm_display_mode *mode); |
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#endif
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