diff options
| author | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-11-09 11:26:33 +0100 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-11-09 15:30:45 +0100 |
| commit | eb8dd3abeb4dffab6c373e87d09fc3b5858ac158 (patch) | |
| tree | 6a11d8e5802173bc18f38fd296f8f85f97fafbc9 /drivers/gpu/drm/vc4 | |
| parent | 0560054da5673b25d56bea6c57c8d069673af73b (diff) | |
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
Diffstat (limited to 'drivers/gpu/drm/vc4')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_plane.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c index 6caa678edcff..1728fb7d00ba 100644 --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -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) |