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Commit 4636ce93 authored by Yannick Fertre's avatar Yannick Fertre Committed by Eric Anholt
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drm/fb-cma-helper: Add drm_fb_cma_get_gem_addr() 



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: default avatarYannick Fertre <yannick.fertre@st.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-3-git-send-email-yannick.fertre@st.com


Reviewed-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: default avatarEric Anholt <eric@anholt.net>
parent 97bf3a9a

drivers/gpu/drm/drm_fb_cma_helper.c

+27 −0
Original line number Diff line number Diff line
@@ -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

include/drm/drm_fb_cma_helper.h

+4 −0
Original line number Diff line number Diff line
@@ -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);