On Wed, Jan 27, 2016 at 03:44:39PM +0100, Marek Szyprowski wrote:
> This patch adds support for generic plane's zpos property property with
> well-defined semantics:
> - added zpos properties to drm core and plane state structures
> - added helpers for normalizing zpos properties of given set of planes
> - well defined semantics: planes are sorted by zpos values and then plane
> id value if zpos equals
>
> Normalized zpos values are calculated automatically when generic
> muttable zpos property has been initialized. Drivers can simply use
> plane_state->normalized_zpos in their atomic_check and/or plane_update
> callbacks without any additional calls to DRM core.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Tested-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> ---
> Documentation/DocBook/gpu.tmpl | 14 ++-
> drivers/gpu/drm/Makefile | 2 +-
> drivers/gpu/drm/drm_atomic.c | 4 +
> drivers/gpu/drm/drm_atomic_helper.c | 6 +
> drivers/gpu/drm/drm_blend.c | 227 ++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/drm_crtc_internal.h | 3 +
> include/drm/drm_crtc.h | 17 +++
> 7 files changed, 270 insertions(+), 3 deletions(-)
> create mode 100644 drivers/gpu/drm/drm_blend.c
>
> diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
> index a8669330b456..ae7d913adf60 100644
> --- a/Documentation/DocBook/gpu.tmpl
> +++ b/Documentation/DocBook/gpu.tmpl
> @@ -1816,7 +1816,7 @@ void intel_crt_init(struct drm_device *dev)
> <td valign="top" >Description/Restrictions</td>
> </tr>
> <tr>
> - <td rowspan="37" valign="top" >DRM</td>
> + <td rowspan="38" valign="top" >DRM</td>
> <td valign="top" >Generic</td>
> <td valign="top" >“rotation”</td>
> <td valign="top" >BITMASK</td>
> @@ -2068,7 +2068,7 @@ void intel_crt_init(struct drm_device *dev)
> <td valign="top" >property to suggest an Y offset for a connector</td>
> </tr>
> <tr>
> - <td rowspan="3" valign="top" >Optional</td>
> + <td rowspan="4" valign="top" >Optional</td>
> <td valign="top" >“scaling mode”</td>
> <td valign="top" >ENUM</td>
> <td valign="top" >{ "None", "Full", "Center", "Full aspect" }</td>
> @@ -2092,6 +2092,16 @@ void intel_crt_init(struct drm_device *dev)
> <td valign="top" >TBD</td>
> </tr>
> <tr>
> + <td valign="top" > "zpos" </td>
> + <td valign="top" >RANGE</td>
> + <td valign="top" >Min=0, Max= driver dependent</td>
> + <td valign="top" >Plane</td>
> + <td valign="top" >Plane's 'z' position during blending operation (0 for background, highest for frontmost).
> + If two planes assigned to same CRTC have equal zpos values, the plane with higher plane
> + id is treated as closer to front. Can be IMMUTABLE if driver doesn't support changing
> + planes' order. Exact value range is driver dependent.</td>
> + </tr>
> + <tr>
> <td rowspan="20" valign="top" >i915</td>
> <td rowspan="2" valign="top" >Generic</td>
> <td valign="top" >"Broadcast RGB"</td>
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 61766dec6a8d..eeefaba1c092 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -2,7 +2,7 @@
> # Makefile for the drm device driver. This driver provides support for the
> # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>
> -drm-y := drm_auth.o drm_bufs.o drm_cache.o \
> +drm-y := drm_auth.o drm_bufs.o drm_blend.o drm_cache.o \
> drm_context.o drm_dma.o \
> drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \
> drm_lock.o drm_memory.o drm_drv.o drm_vm.o \
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 3f74193885f1..a19201efb7d1 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -630,6 +630,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
> state->src_h = val;
> } else if (property == config->rotation_property) {
> state->rotation = val;
> + } else if (property == config->zpos_property) {
> + state->zpos = val;
> } else if (plane->funcs->atomic_set_property) {
> return plane->funcs->atomic_set_property(plane, state,
> property, val);
> @@ -686,6 +688,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
> *val = state->src_h;
> } else if (property == config->rotation_property) {
> *val = state->rotation;
> + } else if (property == config->zpos_property) {
> + *val = state->zpos;
> } else if (plane->funcs->atomic_get_property) {
> return plane->funcs->atomic_get_property(plane, state, property, val);
> } else {
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 53db2d9120be..9fbfb672b317 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -32,6 +32,8 @@
> #include <drm/drm_atomic_helper.h>
> #include <linux/fence.h>
>
> +#include "drm_crtc_internal.h"
> +
> /**
> * DOC: overview
> *
> @@ -530,6 +532,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
> struct drm_plane_state *plane_state;
> int i, ret = 0;
>
> + ret = drm_atomic_helper_normalize_zpos(dev, state);
> + if (ret)
> + return ret;
> +
> for_each_plane_in_state(state, plane, plane_state, i) {
> const struct drm_plane_helper_funcs *funcs;
>
> diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
> new file mode 100644
> index 000000000000..cdcb647c8ed9
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_blend.c
> @@ -0,0 +1,227 @@
> +/*
> + * Copyright (C) 2016 Samsung Electronics Co.Ltd
> + * Authors:
> + * Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> + *
> + * DRM core plane blending related functions
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and its
> + * documentation for any purpose is hereby granted without fee, provided that
> + * the above copyright notice appear in all copies and that both that copyright
> + * notice and this permission notice appear in supporting documentation, and
> + * that the name of the copyright holders not be used in advertising or
> + * publicity pertaining to distribution of the software without specific,
> + * written prior permission. The copyright holders make no representations
> + * about the suitability of this software for any purpose. It is provided "as
> + * is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
> + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
> + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
> + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
> + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
> + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
> + * OF THIS SOFTWARE.
> + */
> +#include <linux/slab.h>
> +#include <linux/sort.h>
> +#include <linux/export.h>
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_atomic.h>
> +
> +#include "drm_internal.h"
> +
> +/**
> + * drm_mode_create_zpos_property - create muttable zpos property
> + * @dev: DRM device
> + * @min: minimal possible value of zpos property
> + * @max: maximal possible value of zpos property
> + *
> + * This function initializes generic muttable zpos property and enables support
> + * for it in drm core. Drivers can then attach this property to planes to enable
> + * support for configurable planes arrangement during blending operation.
> + * Once muttable zpos property has been enabled, the DRM core will automatically
> + * calculate drm_plane_state->normalized_zpos values. Usually min should be set
> + * to 0 and max to maximal number of planes for given crtc - 1.
> + *
> + * If zpos of some planes cannot be changed (like fixed backgroud or
> + * cursor/topmost planes), driver should adjust min/max values and assign those
> + * planes immutable zpos property with lower or higher values (for more
> + * information, see drm_mode_create_zpos_immutable_property() function). In such
> + * case driver should also assign proper initial zpos values for all planes in
> + * its plane_reset() callback, so the planes will be always sorted properly.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_mode_create_zpos_property(struct drm_device *dev, unsigned int min,
> + unsigned int max)
> +{
> + struct drm_property *prop;
> +
> + prop = drm_property_create_range(dev, 0, "zpos", min, max);
> + if (!prop)
> + return -ENOMEM;
> +
> + dev->mode_config.zpos_property = prop;
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_mode_create_zpos_property);
> +
> +/**
> + * drm_mode_create_zpos_immutable_property - create immuttable zpos property
> + * @dev: DRM device
> + * @min: minimal possible value of zpos property
> + * @max: maximal possible value of zpos property
> + *
> + * This function initializes generic immuttable zpos property and enables
> + * support for it in drm core. Using this property driver lets userspace
> + * to get the arrangement of the planes for blending operation and notifies
> + * it that the hardware (or driver) doesn't support changing of the planes'
> + * order.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_mode_create_zpos_immutable_property(struct drm_device *dev,
> + unsigned int min, unsigned int max)
> +{
> + struct drm_property *prop;
> +
> + prop = drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "zpos",
> + min, max);
> + if (!prop)
> + return -ENOMEM;
> +
> + dev->mode_config.zpos_immutable_property = prop;
I want per-plane min/max ranges, so putting this here is no good.
--
Ville Syrjälä
Intel OTC
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