drm/vc4: Make vc4_lbm_size() return 0 when vertical scaling is disabled
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
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@ -395,10 +395,13 @@ static u32 vc4_lbm_size(struct drm_plane_state *state)
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u32 pix_per_line = max(vc4_state->src_w[0], (u32)vc4_state->crtc_w);
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u32 lbm;
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/* LBM is not needed when there's no vertical scaling. */
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if (vc4_state->y_scaling[0] == VC4_SCALING_NONE &&
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vc4_state->y_scaling[1] == VC4_SCALING_NONE)
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return 0;
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if (!vc4_state->is_yuv) {
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if (vc4_state->is_unity)
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return 0;
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else if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
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if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
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lbm = pix_per_line * 8;
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else {
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/* In special cases, this multiplier might be 12. */
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