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Commit 8f8f6a6c authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm: Add drm_framebuffer_plane_{width,height}() 



Add variants of drm_format_plane_{width,height}() that take an entire fb
object instead of just the format. These should be more efficent as they
can just look up the format info from the fb->format pointer rather than
having to look it up (using a linear search based on the format).

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479498793-31021-30-git-send-email-ville.syrjala@linux.intel.com
parent 801c8fe8

drivers/gpu/drm/drm_framebuffer.c

+44 −0
Original line number Diff line number Diff line
@@ -793,3 +793,47 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb) 
	drm_framebuffer_unreference(fb);

}

EXPORT_SYMBOL(drm_framebuffer_remove);



/**

 * drm_framebuffer_plane_width - width of the plane given the first plane

 * @width: width of the first plane

 * @fb: the framebuffer

 * @plane: plane index

 *

 * Returns:

 * The width of @plane, given that the width of the first plane is @width.

 */

int drm_framebuffer_plane_width(int width,

				const struct drm_framebuffer *fb, int plane)

{

	if (plane >= fb->format->num_planes)

		return 0;



	if (plane == 0)

		return width;



	return width / fb->format->hsub;

}

EXPORT_SYMBOL(drm_framebuffer_plane_width);



/**

 * drm_framebuffer_plane_height - height of the plane given the first plane

 * @height: height of the first plane

 * @fb: the framebuffer

 * @plane: plane index

 *

 * Returns:

 * The height of @plane, given that the height of the first plane is @height.

 */

int drm_framebuffer_plane_height(int height,

				 const struct drm_framebuffer *fb, int plane)

{

	if (plane >= fb->format->num_planes)

		return 0;



	if (plane == 0)

		return height;



	return height / fb->format->vsub;

}

EXPORT_SYMBOL(drm_framebuffer_plane_height);

include/drm/drm_framebuffer.h

+6 −0
Original line number Diff line number Diff line
@@ -286,4 +286,10 @@ static inline void drm_framebuffer_assign(struct drm_framebuffer **p, 
					  struct drm_framebuffer, head);	\

	     &fb->head != (&(dev)->mode_config.fb_list);			\

	     fb = list_next_entry(fb, head))



int drm_framebuffer_plane_width(int width,

				const struct drm_framebuffer *fb, int plane);

int drm_framebuffer_plane_height(int height,

				 const struct drm_framebuffer *fb, int plane);



#endif