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drm/vc4: Make vc4_lbm_size() return 0 when vertical scaling is disabled

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LBM is not needed when vertical scaling is disabled. Return 0 in this
case to avoid allocating LBM memory that will anyway be unused.

While at it, drop the test on ->is_unity which is now redundant.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181130090254.594-1-boris.brezillon@bootlin.com
This commit is contained in:
Boris Brezillon 2018-11-30 10:02:49 +01:00
parent 22be874012
commit b2e554d4df
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/vc4/vc4_plane.c
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@ -395,10 +395,13 @@ static u32 vc4_lbm_size(struct drm_plane_state *state)
u32 pix_per_line = max(vc4_state->src_w[0], (u32)vc4_state->crtc_w);
u32 lbm;
/* LBM is not needed when there's no vertical scaling. */
if (vc4_state->y_scaling[0] == VC4_SCALING_NONE &&
vc4_state->y_scaling[1] == VC4_SCALING_NONE)
return 0;
if (!vc4_state->is_yuv) {
if (vc4_state->is_unity)
return 0;
else if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
lbm = pix_per_line * 8;
else {
/* In special cases, this multiplier might be 12. */