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If the drm_plane has a source width that's greater than the max width supported by a single hw overlay, then we assign a 'r_overlay' to it in omap_plane_atomic_check(). Both overlays should have the capabilities required to handle the source framebuffer. The only parameters that vary between the left and right hwoverlays are the src_w, crtc_w, src_x and crtc_x as we just even chop the fb into left and right halves. We also take care of not creating odd width size when dealing with YUV formats. Since both halves need to be 'appear' side by side the zpos is recalculated when dealing with dual overlay cases so that the other planes zpos is consistent. Depending on user space usage it is possible that on occasion the number of requested planes exceeds the numbers of overlays required to display them. In that case a failure would be returned for the plane that cannot be handled at that time. It is up to user space to make sure the H/W resource are not over-subscribed. Signed-off-by: Benoit Parrot <bparrot@ti.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211117141928.771082-10-narmstrong@baylibre.com
28 lines
638 B
C
28 lines
638 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* omap_plane.h -- OMAP DRM Plane
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*
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* Copyright (C) 2011 Texas Instruments
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* Author: Rob Clark <rob@ti.com>
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*/
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#ifndef __OMAPDRM_PLANE_H__
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#define __OMAPDRM_PLANE_H__
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#include <linux/types.h>
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enum drm_plane_type;
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struct drm_device;
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struct drm_mode_object;
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struct drm_plane;
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struct drm_plane *omap_plane_init(struct drm_device *dev,
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int idx, enum drm_plane_type type,
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u32 possible_crtcs);
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void omap_plane_install_properties(struct drm_plane *plane,
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struct drm_mode_object *obj);
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bool is_omap_plane_dual_overlay(struct drm_plane_state *state);
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#endif /* __OMAPDRM_PLANE_H__ */
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