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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/gpu/drm/omapdrm/omap_plane.c
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@@ -1,18 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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  * Author: Rob Clark <rob.clark@linaro.org>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License along with
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- * this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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 #include <drm/drm_atomic.h>
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@@ -64,8 +53,12 @@
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 	memset(&info, 0, sizeof(info));
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 	info.rotation_type = OMAP_DSS_ROT_NONE;
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 	info.rotation = DRM_MODE_ROTATE_0;
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-	info.global_alpha = 0xff;
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+	info.global_alpha = state->alpha >> 8;
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 	info.zorder = state->normalized_zpos;
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+	if (state->pixel_blend_mode == DRM_MODE_BLEND_PREMULTI)
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+		info.pre_mult_alpha = 1;
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+	else
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+		info.pre_mult_alpha = 0;
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 	/* update scanout: */
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 	omap_framebuffer_update_scanout(state->fb, state, &info);
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@@ -296,6 +289,9 @@
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 	omap_plane_install_properties(plane, &plane->base);
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 	drm_plane_create_zpos_property(plane, 0, 0, num_planes - 1);
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+	drm_plane_create_alpha_property(plane);
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+	drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_PREMULTI) |
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+					     BIT(DRM_MODE_BLEND_COVERAGE));
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 	return plane;
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