diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0760-drm-vc4-txp-Force-alpha-to-be-0xff-if-it-s-disabled.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0760-drm-vc4-txp-Force-alpha-to-be-0xff-if-it-s-disabled.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0760-drm-vc4-txp-Force-alpha-to-be-0xff-if-it-s-disabled.patch b/target/linux/bcm27xx/patches-5.15/950-0760-drm-vc4-txp-Force-alpha-to-be-0xff-if-it-s-disabled.patch new file mode 100644 index 0000000000..17baa42376 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0760-drm-vc4-txp-Force-alpha-to-be-0xff-if-it-s-disabled.patch @@ -0,0 +1,29 @@ +From f605781b135e2ebe98aba1d569167bb0d0886930 Mon Sep 17 00:00:00 2001 +From: Maxime Ripard <maxime@cerno.tech> +Date: Fri, 4 Mar 2022 16:00:16 +0100 +Subject: [PATCH] drm/vc4: txp: Force alpha to be 0xff if it's disabled + +If we use a format that has padding instead of the alpha component (such +as XRGB8888), it appears that the Transposer will fill the padding to 0, +disregarding what was stored in the input buffer padding. + +This leads to issues with IGT, since it will set the padding to 0xff, +but will then compare the CRC of the two frames which will thus fail. + +Fixes: 008095e065a8 ("drm/vc4: Add support for the transposer block") +Signed-off-by: Maxime Ripard <maxime@cerno.tech> +--- + drivers/gpu/drm/vc4/vc4_txp.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/gpu/drm/vc4/vc4_txp.c ++++ b/drivers/gpu/drm/vc4/vc4_txp.c +@@ -304,6 +304,8 @@ static void vc4_txp_connector_atomic_com + + if (fb->format->has_alpha) + ctrl |= TXP_ALPHA_ENABLE; ++ else ++ ctrl |= TXP_ALPHA_INVERT; + + gem = drm_fb_cma_get_gem_obj(fb, 0); + TXP_WRITE(TXP_DST_PTR, gem->paddr + fb->offsets[0]); |