From a163f3ac2890a265d144a1922b9028ad0534a7e2 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Thu, 17 May 2018 15:37:59 +0200 Subject: [PATCH] drm/vc4: plane: Expand the lower bits by repeating the higher bits The vc4 HVS uses an internal RGB888 representation of the frames, and will by default expand formats using a lower depth using zeros. This causes an issue when we try to use other compositing software such as pixman that fill the missing bits by repeating the higher significant bits. As such, we can't check the display output in a reliable way by doing a software composition and an hardware one and compare both. To prevent this, force the same behaviour so that we can do such things. Signed-off-by: Maxime Ripard Signed-off-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/20180517133759.25626-1-maxime.ripard@bootlin.com --- drivers/gpu/drm/vc4/vc4_plane.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c index 3483c05cc3d6d..6e8984aee613f 100644 --- a/drivers/gpu/drm/vc4/vc4_plane.c +++ b/drivers/gpu/drm/vc4/vc4_plane.c @@ -544,6 +544,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane, /* Control word */ vc4_dlist_write(vc4_state, SCALER_CTL0_VALID | + VC4_SET_FIELD(SCALER_CTL0_RGBA_EXPAND_ROUND, SCALER_CTL0_RGBA_EXPAND) | (format->pixel_order << SCALER_CTL0_ORDER_SHIFT) | (format->hvs << SCALER_CTL0_PIXEL_FORMAT_SHIFT) | VC4_SET_FIELD(tiling, SCALER_CTL0_TILING) | -- 2.39.5