From 24d69bdfe9bfa28e5bad0ff66c650cdfc34e769a Mon Sep 17 00:00:00 2001
From: David Rosca <david.rosca@amd.com>
Date: Tue, 7 Jan 2025 10:24:58 +0100
Subject: [PATCH] frontends/va: Disable color conversion for luma-only source
 formats

Fixes Y8_400 -> RGB conversion.

Cc: mesa-stable
Reviewed-by: Thong Thai <thong.thai@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32919>
---
 src/gallium/frontends/va/postproc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gallium/frontends/va/postproc.c b/src/gallium/frontends/va/postproc.c
index 4aacd7f6b32..10223d5fb02 100644
--- a/src/gallium/frontends/va/postproc.c
+++ b/src/gallium/frontends/va/postproc.c
@@ -185,6 +185,9 @@ static void vlVaSetProcParameters(vlVaDriver *drv,
       color_standard = VL_CSC_COLOR_STANDARD_BT_709_REV;
    }
 
+   if (util_format_get_nr_components(src->buffer->buffer_format) == 1)
+      color_standard = VL_CSC_COLOR_STANDARD_IDENTITY;
+
    vl_csc_get_matrix(color_standard, NULL, dst->full_range, &drv->csc);
    vl_compositor_set_csc_matrix(&drv->cstate, &drv->csc, 1.0f, 0.0f);