diff options
Diffstat (limited to 'drivers/gpu/drm/drm_fb_cma_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fb_cma_helper.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c index cb2349ad338d..69c57273b184 100644 --- a/drivers/gpu/drm/drm_fb_cma_helper.c +++ b/drivers/gpu/drm/drm_fb_cma_helper.c @@ -9,12 +9,14 @@ * Copyright (C) 2012 Red Hat */ +#include <drm/drm_damage_helper.h> #include <drm/drm_fb_cma_helper.h> #include <drm/drm_fourcc.h> #include <drm/drm_framebuffer.h> #include <drm/drm_gem_cma_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_plane.h> +#include <linux/dma-mapping.h> #include <linux/module.h> /** @@ -97,3 +99,47 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb, return paddr; } EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr); + +/** + * drm_fb_cma_sync_non_coherent - Sync GEM object to non-coherent backing + * memory + * @drm: DRM device + * @old_state: Old plane state + * @state: New plane state + * + * 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. + */ +void drm_fb_cma_sync_non_coherent(struct drm_device *drm, + struct drm_plane_state *old_state, + struct drm_plane_state *state) +{ + const struct drm_format_info *finfo = state->fb->format; + struct drm_atomic_helper_damage_iter iter; + const struct drm_gem_cma_object *cma_obj; + unsigned int offset, i; + struct drm_rect clip; + dma_addr_t daddr; + size_t nb_bytes; + + for (i = 0; i < finfo->num_planes; i++) { + cma_obj = drm_fb_cma_get_gem_obj(state->fb, i); + if (!cma_obj->map_noncoherent) + continue; + + daddr = drm_fb_cma_get_gem_addr(state->fb, state, i); + drm_atomic_helper_damage_iter_init(&iter, old_state, state); + + drm_atomic_for_each_plane_damage(&iter, &clip) { + /* Ignore x1/x2 values, invalidate complete lines */ + offset = clip.y1 * state->fb->pitches[i]; + + nb_bytes = (clip.y2 - clip.y1) * state->fb->pitches[i]; + dma_sync_single_for_device(drm->dev, daddr + offset, + nb_bytes, DMA_TO_DEVICE); + } + } +} +EXPORT_SYMBOL_GPL(drm_fb_cma_sync_non_coherent); |