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Commit 0377f4ed authored by Sean Paul's avatar Sean Paul Committed by Inki Dae
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drm/exynos: Don't blend mixer layer 0 



This patch disables blending the mixer's layer 0 onto the background
(solid color). It doesn't make sense to blend this layer by default,
and causes color distortion if the layer is used for arbitrary content.

Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 5f46c333

drivers/gpu/drm/exynos/exynos_mixer.c

+5 −3
Original line number Diff line number Diff line
@@ -643,12 +643,14 @@ static void mixer_win_reset(struct mixer_context *ctx) 
	/* setting graphical layers */

	val  = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */

	val |= MXR_GRP_CFG_WIN_BLEND_EN;

	val |= MXR_GRP_CFG_BLEND_PRE_MUL;

	val |= MXR_GRP_CFG_PIXEL_BLEND_EN;

	val |= MXR_GRP_CFG_ALPHA_VAL(0xff); /* non-transparent alpha */



	/* the same configuration for both layers */

	/* Don't blend layer 0 onto the mixer background */

	mixer_reg_write(res, MXR_GRAPHIC_CFG(0), val);



	/* Blend layer 1 into layer 0 */

	val |= MXR_GRP_CFG_BLEND_PRE_MUL;

	val |= MXR_GRP_CFG_PIXEL_BLEND_EN;

	mixer_reg_write(res, MXR_GRAPHIC_CFG(1), val);



	/* setting video layers */