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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: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181109102633.32603-2-boris.brezillon@bootlin.com
This commit is contained in:
Boris Brezillon 2018-11-09 11:26:33 +01:00
parent 0560054da5
commit eb8dd3abeb
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/drm/vc4/vc4_plane.c
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@ -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)
return VC4_SCALING_PPF;
else if (dst < src)
return VC4_SCALING_TPZ;
else
if (dst == src)
return VC4_SCALING_NONE;
if (3 * dst >= 2 * src)
return VC4_SCALING_PPF;
else
return VC4_SCALING_TPZ;
}
static bool plane_enabled(struct drm_plane_state *state)