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drm/fb-cma-helper: Add drm_fb_cma_get_gem_addr()

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Add function drm_fb_cma_get_gem_addr() which return the physical address
of framebuffer (1st pixel). This function will usually be called by plane
callback (atomic_update).

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-3-git-send-email-yannick.fertre@st.com
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Yannick Fertre 2017-04-14 12:13:32 +02:00 committed by Eric Anholt
parent 97bf3a9aa6
commit 4636ce93d5
2 changed files with 31 additions and 0 deletions
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27
drivers/gpu/drm/drm_fb_cma_helper.c
View File

@ -259,6 +259,33 @@ struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
/**
* drm_fb_cma_get_gem_addr() - Get physical address for framebuffer
* @fb: The framebuffer
* @state: Which state of drm plane
* @plane: Which plane
* Return the CMA GEM address for given framebuffer.
*
* This function will usually be called from the PLANE callback functions.
*/
dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
struct drm_plane_state *state,
unsigned int plane)
{
struct drm_fb_cma *fb_cma = to_fb_cma(fb);
dma_addr_t paddr;
if (plane >= 4)
return 0;
paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
paddr += fb->format->cpp[plane] * (state->src_x >> 16);
paddr += fb->pitches[plane] * (state->src_y >> 16);
return paddr;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
/**
* drm_fb_cma_prepare_fb() - Prepare CMA framebuffer
* @plane: Which plane

4
include/drm/drm_fb_cma_helper.h
View File

@ -41,6 +41,10 @@ struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
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);
int drm_fb_cma_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state);