drm/vc4: Enable bg_fill if there are no planes enabled

The default was to have enable_bg_fill disabled and the first
plane set it if it wasn't opaque and covering the whole screen.
However that meant that if no planes were enabled, then the
background fill wasn't enabled, and would give a striped
output from the uninitialised output buffer.

Initialise it to enabled to avoid this.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241025-drm-vc4-2712-support-v2-27-35efa83c8fc0@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index 2493ac17d78f4f32ea0510a24f1d6ba5fc096bef..c8bc2b48648f406598675c6aa6f9345b6684be37 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -936,7 +936,7 @@ void vc4_hvs_atomic_flush(struct drm_crtc *crtc,
        struct drm_plane *plane;
        struct vc4_plane_state *vc4_plane_state;
        bool debug_dump_regs = false;
-       bool enable_bg_fill = false;
+       bool enable_bg_fill = true;
        u32 __iomem *dlist_start = vc4->hvs->dlist + vc4_state->mm.start;
        u32 __iomem *dlist_next = dlist_start;
        unsigned int zpos = 0;