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30 lines
1.1 KiB
Diff
30 lines
1.1 KiB
Diff
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From f605781b135e2ebe98aba1d569167bb0d0886930 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Fri, 4 Mar 2022 16:00:16 +0100
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Subject: [PATCH] drm/vc4: txp: Force alpha to be 0xff if it's disabled
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If we use a format that has padding instead of the alpha component (such
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as XRGB8888), it appears that the Transposer will fill the padding to 0,
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disregarding what was stored in the input buffer padding.
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This leads to issues with IGT, since it will set the padding to 0xff,
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but will then compare the CRC of the two frames which will thus fail.
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Fixes: 008095e065a8 ("drm/vc4: Add support for the transposer block")
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/vc4/vc4_txp.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_txp.c
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+++ b/drivers/gpu/drm/vc4/vc4_txp.c
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@@ -304,6 +304,8 @@ static void vc4_txp_connector_atomic_com
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if (fb->format->has_alpha)
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ctrl |= TXP_ALPHA_ENABLE;
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+ else
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+ ctrl |= TXP_ALPHA_INVERT;
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gem = drm_fb_cma_get_gem_obj(fb, 0);
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TXP_WRITE(TXP_DST_PTR, gem->paddr + fb->offsets[0]);
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