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Commit eb8dd3ab authored by Boris Brezillon's avatar Boris Brezillon
Browse files

drm/vc4: Prefer PPF over TPZ when dst >= 2/3 src 



The HVS spec recommends using PPF when the downscaling ratio is
between 2/3 and 1. Let's modify vc4_get_scaling_mode() to follow this
recommendation.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarEric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181109102633.32603-2-boris.brezillon@bootlin.com
parent 0560054d

drivers/gpu/drm/vc4/vc4_plane.c

+4 −4
Original line number Diff line number Diff line
@@ -129,12 +129,12 @@ static const struct hvs_format *vc4_get_hvs_format(u32 drm_format) 


static enum vc4_scaling_mode vc4_get_scaling_mode(u32 src, u32 dst)

{

	if (dst > src)

	if (dst == src)

		return VC4_SCALING_NONE;

	if (3 * dst >= 2 * src)

		return VC4_SCALING_PPF;

	else if (dst < src)

		return VC4_SCALING_TPZ;

	else

		return VC4_SCALING_NONE;

		return VC4_SCALING_TPZ;

}



static bool plane_enabled(struct drm_plane_state *state)