From 6205e9e5bef2556972e73d63df48cdad7272dcf7 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Fri, 25 Oct 2024 18:15:59 +0100 Subject: [PATCH 623/697] drm/vc4: Drop planes that are completely off-screen or 0 crtc size It is permitted for a plane to be configured such that none of it is on-screen via either negative dest rectangle X,Y offset, or an offset that is greater than the crtc dimensions. These planes were resized via drm_atomic_helper_check_plane_state such that the source rectangle had a zero width or height, but they still created a dlist entry even though they contributed no pixels. In the case of vc6_plane_mode_set, that it could result in negative values being written into registers, which caused incorrect behaviour. Drop planes that result in a source width or height of 0 pixels or an on-screen size of 0 pixels to avoid the incorrect rendering. Reviewed-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20241025-drm-vc4-2712-support-v2-28-35efa83c8fc0@raspberrypi.com Signed-off-by: Dave Stevenson --- drivers/gpu/drm/vc4/vc4_plane.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -1230,6 +1230,13 @@ static int vc4_plane_mode_set(struct drm if (ret) return ret; + if (!vc4_state->src_w[0] || !vc4_state->src_h[0] || + !vc4_state->crtc_w || !vc4_state->crtc_h) { + /* 0 source size probably means the plane is offscreen */ + vc4_state->dlist_initialized = 1; + return 0; + } + width = vc4_state->src_w[0] >> 16; height = vc4_state->src_h[0] >> 16; @@ -1753,6 +1760,15 @@ static int vc6_plane_mode_set(struct drm if (ret) return ret; + if (!vc4_state->src_w[0] || !vc4_state->src_h[0] || + !vc4_state->crtc_w || !vc4_state->crtc_h) { + /* 0 source size probably means the plane is offscreen. + * 0 destination size is a redundant plane. + */ + vc4_state->dlist_initialized = 1; + return 0; + } + width = vc4_state->src_w[0] >> 16; height = vc4_state->src_h[0] >> 16; @@ -2135,6 +2151,10 @@ static int vc4_plane_atomic_check(struct if (ret) return ret; + if (!vc4_state->src_w[0] || !vc4_state->src_h[0] || + !vc4_state->crtc_w || !vc4_state->crtc_h) + return 0; + ret = vc4_plane_allocate_lbm(new_plane_state); if (ret) return ret;