From 83fb26e02e99c518ec9f9684b0d72e92c28b3aa0 Mon Sep 17 00:00:00 2001 From: Stefan Schake Date: Fri, 9 Mar 2018 01:53:35 +0100 Subject: [PATCH] drm/vc4: Check if plane requires background fill Considering a single plane only, we have to enable background color when the plane has an alpha format and could be blending from the background or when it doesn't cover the entire screen. Changes from v1: - Drop unrelated change - Move needs_bg_fill to plane state Signed-off-by: Stefan Schake Signed-off-by: Eric Anholt Reviewed-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/1520556817-97297-3-git-send-email-stschake@gmail.com --- drivers/gpu/drm/vc4/vc4_plane.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c index 831e1959e64d3..8be9a876fa172 100644 --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -73,6 +73,12 @@ struct vc4_plane_state { /* Our allocation in LBM for temporary storage during scaling. */ struct drm_mm_node lbm; + + /* Set when the plane has per-pixel alpha content or does not cover + * the entire screen. This is a hint to the CRTC that it might need + * to enable background color fill. + */ + bool needs_bg_fill; }; static inline struct vc4_plane_state * @@ -521,6 +527,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane, u32 ctl0_offset = vc4_state->dlist_count; const struct hvs_format *format = vc4_get_hvs_format(fb->format->format); int num_planes = drm_format_num_planes(format->drm); + bool covers_screen; u32 scl0, scl1, pitch0; u32 lbm_size, tiling; unsigned long irqflags; @@ -701,6 +708,16 @@ static int vc4_plane_mode_set(struct drm_plane *plane, vc4_state->dlist[ctl0_offset] |= VC4_SET_FIELD(vc4_state->dlist_count, SCALER_CTL0_SIZE); + /* crtc_* are already clipped coordinates. */ + covers_screen = vc4_state->crtc_x == 0 && vc4_state->crtc_y == 0 && + vc4_state->crtc_w == state->crtc->mode.hdisplay && + vc4_state->crtc_h == state->crtc->mode.vdisplay; + /* Background fill might be necessary when the plane has per-pixel + * alpha content and blends from the background or does not cover + * the entire screen. + */ + vc4_state->needs_bg_fill = fb->format->has_alpha || !covers_screen; + return 0; } -- 2.39.5