linux/include/drm/drm_fb_cma_helper.h
Paul Cercueil b09069046d
drm: Add and export function drm_fb_cma_sync_non_coherent
This function can be used by drivers that use damage clips and have
CMA GEM objects backed by non-coherent memory. Calling this function
in a plane's .atomic_update ensures that all the data in the backing
memory have been written to RAM.

v3: - Only sync data if using GEM objects backed by non-coherent memory.
    - Use a drm_device pointer instead of device pointer in prototype

v5: - Rename to drm_fb_cma_sync_non_coherent
    - Invert loops for better cache locality
    - Only sync BOs that have the non-coherent flag
    - Move to drm_fb_cma_helper.c to avoid circular dependency

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210523170415.90410-3-paul@crapouillou.net
2021-05-25 11:42:09 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __DRM_FB_CMA_HELPER_H__
#define __DRM_FB_CMA_HELPER_H__
#include <linux/types.h>
struct drm_device;
struct drm_framebuffer;
struct drm_plane_state;
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
unsigned int plane);
dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
struct drm_plane_state *state,
unsigned int plane);
void drm_fb_cma_sync_non_coherent(struct drm_device *drm,
struct drm_plane_state *old_state,
struct drm_plane_state *state);
#endif