398 lines
14 KiB
C
398 lines
14 KiB
C
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/*
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* Copyright (C) 2016 Samsung Electronics Co.Ltd
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* Authors:
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* DRM core plane blending related functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_blend.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include "drm_crtc_internal.h"
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/**
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* DOC: overview
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*
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* The basic plane composition model supported by standard plane properties only
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* has a source rectangle (in logical pixels within the &drm_framebuffer), with
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* sub-pixel accuracy, which is scaled up to a pixel-aligned destination
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* rectangle in the visible area of a &drm_crtc. The visible area of a CRTC is
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* defined by the horizontal and vertical visible pixels (stored in @hdisplay
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* and @vdisplay) of the requested mode (stored in @mode in the
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* &drm_crtc_state). These two rectangles are both stored in the
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* &drm_plane_state.
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*
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* For the atomic ioctl the following standard (atomic) properties on the plane object
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* encode the basic plane composition model:
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*
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* SRC_X:
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* X coordinate offset for the source rectangle within the
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* &drm_framebuffer, in 16.16 fixed point. Must be positive.
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* SRC_Y:
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* Y coordinate offset for the source rectangle within the
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* &drm_framebuffer, in 16.16 fixed point. Must be positive.
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* SRC_W:
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* Width for the source rectangle within the &drm_framebuffer, in 16.16
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* fixed point. SRC_X plus SRC_W must be within the width of the source
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* framebuffer. Must be positive.
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* SRC_H:
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* Height for the source rectangle within the &drm_framebuffer, in 16.16
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* fixed point. SRC_Y plus SRC_H must be within the height of the source
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* framebuffer. Must be positive.
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* CRTC_X:
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* X coordinate offset for the destination rectangle. Can be negative.
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* CRTC_Y:
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* Y coordinate offset for the destination rectangle. Can be negative.
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* CRTC_W:
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* Width for the destination rectangle. CRTC_X plus CRTC_W can extend past
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* the currently visible horizontal area of the &drm_crtc.
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* CRTC_H:
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* Height for the destination rectangle. CRTC_Y plus CRTC_H can extend past
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* the currently visible vertical area of the &drm_crtc.
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* FB_ID:
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* Mode object ID of the &drm_framebuffer this plane should scan out.
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* CRTC_ID:
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* Mode object ID of the &drm_crtc this plane should be connected to.
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*
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* Note that the source rectangle must fully lie within the bounds of the
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* &drm_framebuffer. The destination rectangle can lie outside of the visible
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* area of the current mode of the CRTC. It must be apprpriately clipped by the
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* driver, which can be done by calling drm_plane_helper_check_update(). Drivers
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* are also allowed to round the subpixel sampling positions appropriately, but
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* only to the next full pixel. No pixel outside of the source rectangle may
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* ever be sampled, which is important when applying more sophisticated
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* filtering than just a bilinear one when scaling. The filtering mode when
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* scaling is unspecified.
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*
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* On top of this basic transformation additional properties can be exposed by
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* the driver:
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*
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* - Rotation is set up with drm_mode_create_rotation_property(). It adds a
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* rotation and reflection step between the source and destination rectangles.
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* Without this property the rectangle is only scaled, but not rotated or
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* reflected.
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*
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* - Z position is set up with drm_plane_create_zpos_immutable_property() and
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* drm_plane_create_zpos_property(). It controls the visibility of overlapping
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* planes. Without this property the primary plane is always below the cursor
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* plane, and ordering between all other planes is undefined.
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*
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* Note that all the property extensions described here apply either to the
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* plane or the CRTC (e.g. for the background color, which currently is not
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* exposed and assumed to be black).
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*/
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/**
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* drm_mode_create_rotation_property - create a new rotation property
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* @dev: DRM device
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* @supported_rotations: bitmask of supported rotations and reflections
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*
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* This creates a new property with the selected support for transformations.
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* The resulting property should be stored in @rotation_property in
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* &drm_mode_config. It then must be attached to each plane which supports
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* rotations using drm_object_attach_property().
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*
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* FIXME: Probably better if the rotation property is created on each plane,
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* like the zpos property. Otherwise it's not possible to allow different
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* rotation modes on different planes.
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*
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* Since a rotation by 180° degress is the same as reflecting both along the x
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* and the y axis the rotation property is somewhat redundant. Drivers can use
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* drm_rotation_simplify() to normalize values of this property.
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*
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* The property exposed to userspace is a bitmask property (see
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* drm_property_create_bitmask()) called "rotation" and has the following
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* bitmask enumaration values:
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*
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* DRM_ROTATE_0:
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* "rotate-0"
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* DRM_ROTATE_90:
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* "rotate-90"
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* DRM_ROTATE_180:
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* "rotate-180"
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* DRM_ROTATE_270:
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* "rotate-270"
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* DRM_REFLECT_X:
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* "reflect-x"
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* DRM_REFELCT_Y:
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* "reflect-y"
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*
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* Rotation is the specified amount in degrees in counter clockwise direction,
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* the X and Y axis are within the source rectangle, i.e. the X/Y axis before
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* rotation. After reflection, the rotation is applied to the image sampled from
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* the source rectangle, before scaling it to fit the destination rectangle.
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*/
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struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
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unsigned int supported_rotations)
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{
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static const struct drm_prop_enum_list props[] = {
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{ __builtin_ffs(DRM_ROTATE_0) - 1, "rotate-0" },
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{ __builtin_ffs(DRM_ROTATE_90) - 1, "rotate-90" },
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{ __builtin_ffs(DRM_ROTATE_180) - 1, "rotate-180" },
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{ __builtin_ffs(DRM_ROTATE_270) - 1, "rotate-270" },
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{ __builtin_ffs(DRM_REFLECT_X) - 1, "reflect-x" },
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{ __builtin_ffs(DRM_REFLECT_Y) - 1, "reflect-y" },
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};
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return drm_property_create_bitmask(dev, 0, "rotation",
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props, ARRAY_SIZE(props),
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supported_rotations);
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}
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EXPORT_SYMBOL(drm_mode_create_rotation_property);
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/**
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* drm_rotation_simplify() - Try to simplify the rotation
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* @rotation: Rotation to be simplified
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* @supported_rotations: Supported rotations
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*
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* Attempt to simplify the rotation to a form that is supported.
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* Eg. if the hardware supports everything except DRM_REFLECT_X
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* one could call this function like this:
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*
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* drm_rotation_simplify(rotation, DRM_ROTATE_0 |
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* DRM_ROTATE_90 | DRM_ROTATE_180 |
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* DRM_ROTATE_270 | DRM_REFLECT_Y);
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*
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* to eliminate the DRM_ROTATE_X flag. Depending on what kind of
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* transforms the hardware supports, this function may not
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* be able to produce a supported transform, so the caller should
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* check the result afterwards.
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*/
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unsigned int drm_rotation_simplify(unsigned int rotation,
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unsigned int supported_rotations)
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{
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if (rotation & ~supported_rotations) {
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rotation ^= DRM_REFLECT_X | DRM_REFLECT_Y;
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rotation = (rotation & DRM_REFLECT_MASK) |
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BIT((ffs(rotation & DRM_ROTATE_MASK) + 1) % 4);
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}
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return rotation;
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}
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EXPORT_SYMBOL(drm_rotation_simplify);
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/**
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* drm_plane_create_zpos_property - create mutable zpos property
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* @plane: drm plane
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* @zpos: initial value of zpos property
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* @min: minimal possible value of zpos property
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* @max: maximal possible value of zpos property
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*
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* This function initializes generic mutable zpos property and enables support
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* for it in drm core. Drivers can then attach this property to planes to enable
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* support for configurable planes arrangement during blending operation.
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* Once mutable zpos property has been enabled, the DRM core will automatically
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* calculate drm_plane_state->normalized_zpos values. Usually min should be set
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* to 0 and max to maximal number of planes for given crtc - 1.
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*
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* If zpos of some planes cannot be changed (like fixed background or
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* cursor/topmost planes), driver should adjust min/max values and assign those
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* planes immutable zpos property with lower or higher values (for more
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* information, see drm_plane_create_zpos_immutable_property() function). In such
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* case driver should also assign proper initial zpos values for all planes in
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* its plane_reset() callback, so the planes will be always sorted properly.
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*
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* See also drm_atomic_normalize_zpos().
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*
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* The property exposed to userspace is called "zpos".
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_plane_create_zpos_property(struct drm_plane *plane,
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unsigned int zpos,
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unsigned int min, unsigned int max)
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{
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struct drm_property *prop;
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prop = drm_property_create_range(plane->dev, 0, "zpos", min, max);
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if (!prop)
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return -ENOMEM;
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drm_object_attach_property(&plane->base, prop, zpos);
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plane->zpos_property = prop;
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if (plane->state) {
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plane->state->zpos = zpos;
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plane->state->normalized_zpos = zpos;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_plane_create_zpos_property);
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/**
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* drm_plane_create_zpos_immutable_property - create immuttable zpos property
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* @plane: drm plane
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* @zpos: value of zpos property
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*
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* This function initializes generic immutable zpos property and enables
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* support for it in drm core. Using this property driver lets userspace
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* to get the arrangement of the planes for blending operation and notifies
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* it that the hardware (or driver) doesn't support changing of the planes'
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* order. For mutable zpos see drm_plane_create_zpos_property().
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*
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* The property exposed to userspace is called "zpos".
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
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unsigned int zpos)
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{
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struct drm_property *prop;
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prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE,
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"zpos", zpos, zpos);
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if (!prop)
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return -ENOMEM;
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drm_object_attach_property(&plane->base, prop, zpos);
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plane->zpos_property = prop;
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if (plane->state) {
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plane->state->zpos = zpos;
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plane->state->normalized_zpos = zpos;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property);
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static int drm_atomic_state_zpos_cmp(const void *a, const void *b)
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{
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const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
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const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
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if (sa->zpos != sb->zpos)
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return sa->zpos - sb->zpos;
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else
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return sa->plane->base.id - sb->plane->base.id;
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}
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static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
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struct drm_crtc_state *crtc_state)
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{
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struct drm_atomic_state *state = crtc_state->state;
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struct drm_device *dev = crtc->dev;
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int total_planes = dev->mode_config.num_total_plane;
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struct drm_plane_state **states;
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struct drm_plane *plane;
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int i, n = 0;
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int ret = 0;
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DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
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crtc->base.id, crtc->name);
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states = kmalloc_array(total_planes, sizeof(*states), GFP_TEMPORARY);
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if (!states)
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return -ENOMEM;
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/*
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* Normalization process might create new states for planes which
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* normalized_zpos has to be recalculated.
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*/
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drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
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struct drm_plane_state *plane_state =
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drm_atomic_get_plane_state(state, plane);
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if (IS_ERR(plane_state)) {
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ret = PTR_ERR(plane_state);
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goto done;
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}
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states[n++] = plane_state;
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DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",
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plane->base.id, plane->name,
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plane_state->zpos);
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}
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sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
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for (i = 0; i < n; i++) {
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plane = states[i]->plane;
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states[i]->normalized_zpos = i;
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DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",
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plane->base.id, plane->name, i);
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}
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crtc_state->zpos_changed = true;
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done:
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kfree(states);
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return ret;
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}
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|
/**
|
||
|
|
* drm_atomic_normalize_zpos - calculate normalized zpos values for all crtcs
|
||
|
|
* @dev: DRM device
|
||
|
|
* @state: atomic state of DRM device
|
||
|
|
*
|
||
|
|
* This function calculates normalized zpos value for all modified planes in
|
||
|
|
* the provided atomic state of DRM device.
|
||
|
|
*
|
||
|
|
* For every CRTC this function checks new states of all planes assigned to
|
||
|
|
* it and calculates normalized zpos value for these planes. Planes are compared
|
||
|
|
* first by their zpos values, then by plane id (if zpos is equal). The plane
|
||
|
|
* with lowest zpos value is at the bottom. The plane_state->normalized_zpos is
|
||
|
|
* then filled with unique values from 0 to number of active planes in crtc
|
||
|
|
* minus one.
|
||
|
|
*
|
||
|
|
* RETURNS
|
||
|
|
* Zero for success or -errno
|
||
|
|
*/
|
||
|
|
int drm_atomic_normalize_zpos(struct drm_device *dev,
|
||
|
|
struct drm_atomic_state *state)
|
||
|
|
{
|
||
|
|
struct drm_crtc *crtc;
|
||
|
|
struct drm_crtc_state *crtc_state;
|
||
|
|
struct drm_plane *plane;
|
||
|
|
struct drm_plane_state *plane_state;
|
||
|
|
int i, ret = 0;
|
||
|
|
|
||
|
|
for_each_plane_in_state(state, plane, plane_state, i) {
|
||
|
|
crtc = plane_state->crtc;
|
||
|
|
if (!crtc)
|
||
|
|
continue;
|
||
|
|
if (plane->state->zpos != plane_state->zpos) {
|
||
|
|
crtc_state =
|
||
|
|
drm_atomic_get_existing_crtc_state(state, crtc);
|
||
|
|
crtc_state->zpos_changed = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for_each_crtc_in_state(state, crtc, crtc_state, i) {
|
||
|
|
if (crtc_state->plane_mask != crtc->state->plane_mask ||
|
||
|
|
crtc_state->zpos_changed) {
|
||
|
|
ret = drm_atomic_helper_crtc_normalize_zpos(crtc,
|
||
|
|
crtc_state);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(drm_atomic_normalize_zpos);
|