[PATCH v4 0/3] drm/exynos: introduce generic zpos property

[PATCH v4 0/3] drm/exynos: introduce generic zpos property

[Marek Szyprowski]

Hello all,

This patch series is a continuation of rework of blending support in
Exynos DRM driver. Some background can be found here:
http://www.spinics.net/lists/dri-devel/msg96969.html

Daniel Vetter suggested that zpos property should be made generic, with
well-defined semantics. This patchset is my proposal for such generic
zpos property:
- 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.

Patches are based on top of latest exynos-drm-next branch.

Best regards
Marek Szyprowski
Samsung R&D Institute Poland

Changelog:

v4:
- made min/max values of zpos property driver dependent (request of
  Ville Syrjälä)
- adjusted some comments

v3: http://www.spinics.net/lists/dri-devel/msg98207.html
- on request of Daniel Vetter, moved all normalization process to DRM
  core, drivers can simply use plane_state->normalized_zpos in their
  atomic_check/update callbacks with no additional changes needed
- updated documentation

v2: http://www.spinics.net/lists/dri-devel/msg98093.html
- dropped 2 fixes for Exynos DRM, which got merged in meantime
- added more comments and kernel docs for core functions as suggested
  by Daniel Vetter
- reworked initialization of zpos properties (moved assiging property
  class to common code), now the code in the driver is even simpler
- while reworking of intialization of zpos property code, did the same
  change to generic rotation property

v1: http://www.spinics.net/lists/dri-devel/msg97709.html
- initial version

Patch summary:


Marek Szyprowski (3):
  drm: add generic zpos property
  drm/exynos: use generic code for managing zpos plane property
  drm: simplify initialization of rotation property

 Documentation/DocBook/gpu.tmpl                  |  14 ++-
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c |  10 +-
 drivers/gpu/drm/drm_atomic.c                    |   4 +
 drivers/gpu/drm/drm_atomic_helper.c             | 118 ++++++++++++++++++++++++
 drivers/gpu/drm/drm_crtc.c                      |  96 +++++++++++++++++--
 drivers/gpu/drm/exynos/exynos_drm_drv.h         |   2 -
 drivers/gpu/drm/exynos/exynos_drm_plane.c       |  68 ++++----------
 drivers/gpu/drm/exynos/exynos_mixer.c           |   6 +-
 drivers/gpu/drm/i915/intel_display.c            |   6 +-
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c       |   3 +-
 drivers/gpu/drm/omapdrm/omap_drv.c              |   3 +-
 include/drm/drm_crtc.h                          |  21 ++++-
 12 files changed, 271 insertions(+), 80 deletions(-)

-- 
1.9.2

[PATCH v4 1/3] drm: add generic zpos property

[Marek Szyprowski]

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@samsung.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
---
 Documentation/DocBook/gpu.tmpl      |  14 ++++-
 drivers/gpu/drm/drm_atomic.c        |   4 ++
 drivers/gpu/drm/drm_atomic_helper.c | 118 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_crtc.c          |  67 ++++++++++++++++++++
 include/drm/drm_crtc.h              |  17 ++++++
 5 files changed, 218 insertions(+), 2 deletions(-)

diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
index 6c6e81a9eaf4..183de4a5f4db 100644
--- a/Documentation/DocBook/gpu.tmpl
+++ b/Documentation/DocBook/gpu.tmpl
@@ -2004,7 +2004,7 @@ 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>
@@ -2256,7 +2256,7 @@ 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>
@@ -2280,6 +2280,16 @@ 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/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 6a21e5c378c1..97bb069cb6a3 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -614,6 +614,8 @@ 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);
@@ -670,6 +672,8 @@ 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 d0d4b2ff7c21..be84b3785de2 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -31,6 +31,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_atomic_helper.h>
 #include <linux/fence.h>
+#include <linux/sort.h>
 
 /**
  * DOC: overview
@@ -507,6 +508,119 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
 
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b)
+{
+	const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
+	const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
+	int zpos_a = (sa->zpos << 16) + sa->plane->base.id;
+	int zpos_b = (sb->zpos << 16) + sb->plane->base.id;
+
+	return zpos_a - zpos_b;
+}
+
+/**
+ * drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values
+ * @crtc: crtc with planes, which have to be considered for normalization
+ * @crtc_state: new atomic state to apply
+ *
+ * This function checks new states of all planes assigned to given crtc and
+ * calculates normalized zpos value for them. Planes are compared first by their
+ * zpos values, then by plane id (if zpos equals). Plane with lowest zpos value
+ * is at the bottom. The plane_state->normalized_zpos is then filled with uniqe
+ * values from 0 to number of active planes in crtc minus one.
+ *
+ * RETURNS
+ * Zero for success or -errno
+ */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
+					      struct drm_crtc_state *crtc_state)
+{
+	struct drm_atomic_state *state = crtc_state->state;
+	struct drm_device *dev = crtc->dev;
+	int total_planes = dev->mode_config.num_total_plane;
+	struct drm_plane_state **states;
+	struct drm_plane *plane;
+	int i, n = 0;
+	int ret = 0;
+
+	DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
+			 crtc->base.id, crtc->name);
+
+	states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
+	if (!states)
+		return -ENOMEM;
+
+	/*
+	 * Normalization process might create new states for planes which
+	 * normalized_zpos has to be recalculated.
+	 */
+	drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
+		struct drm_plane_state *plane_state =
+			drm_atomic_get_plane_state(state, plane);
+		if (IS_ERR(plane_state)) {
+			ret = PTR_ERR(plane_state);
+			goto fail;
+		}
+		states[n++] = plane_state;
+		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",
+				 plane->base.id, plane->name, plane_state->zpos);
+	}
+
+	sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
+
+	for (i = 0; i < n; i++) {
+		plane = states[i]->plane;
+		states[i]->normalized_zpos = i;
+		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",
+				 plane->base.id, plane->name, i);
+	}
+	crtc_state->zpos_changed = true;
+
+fail:
+	kfree(states);
+	return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
+
+static int drm_atomic_helper_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;
+
+	/*
+	 * If zpos_property is not initialized, then it makes no sense
+	 * to calculate normalized zpos values.
+	 */
+	if (!dev->mode_config.zpos_property)
+		return 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;
+}
+
 /**
  * drm_atomic_helper_check_planes - validate state object for planes changes
  * @dev: DRM device
@@ -532,6 +646,10 @@ 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_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 62fa95fa5471..c6f7238cdab3 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5880,6 +5880,73 @@ struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
 EXPORT_SYMBOL(drm_mode_create_rotation_property);
 
 /**
+ * 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;
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_zpos_immutable_property);
+
+/**
  * DOC: Tile group
  *
  * Tile groups are used to represent tiled monitors with a unique
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 3b040b355472..f53cdda1167b 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -305,6 +305,7 @@ struct drm_plane_helper_funcs;
  * @mode_changed: crtc_state->mode or crtc_state->enable has been changed
  * @active_changed: crtc_state->active has been toggled.
  * @connectors_changed: connectors to this crtc have been updated
+ * @zpos_changed: zpos values of planes on this crtc have been updated
  * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
  * @last_vblank_count: for helpers and drivers to capture the vblank of the
  * 	update to ensure framebuffer cleanup isn't done too early
@@ -331,6 +332,7 @@ struct drm_crtc_state {
 	bool mode_changed : 1;
 	bool active_changed : 1;
 	bool connectors_changed : 1;
+	bool zpos_changed : 1;
 
 	/* attached planes bitmask:
 	 * WARNING: transitional helpers do not maintain plane_mask so
@@ -1243,6 +1245,9 @@ struct drm_connector {
  *	plane (in 16.16)
  * @src_w: width of visible portion of plane (in 16.16)
  * @src_h: height of visible portion of plane (in 16.16)
+ * @zpos: priority of the given plane on crtc (optional)
+ * @normalized_zpos: normalized value of zpos: uniqe, range from 0 to
+ *	(number of planes - 1) for given crtc
  * @state: backpointer to global drm_atomic_state
  */
 struct drm_plane_state {
@@ -1263,6 +1268,10 @@ struct drm_plane_state {
 	/* Plane rotation */
 	unsigned int rotation;
 
+	/* Plane zpos */
+	unsigned int zpos;
+	unsigned int normalized_zpos;
+
 	struct drm_atomic_state *state;
 };
 
@@ -2083,6 +2092,8 @@ struct drm_mode_config {
 	struct drm_property *tile_property;
 	struct drm_property *plane_type_property;
 	struct drm_property *rotation_property;
+	struct drm_property *zpos_property;
+	struct drm_property *zpos_immutable_property;
 	struct drm_property *prop_src_x;
 	struct drm_property *prop_src_y;
 	struct drm_property *prop_src_w;
@@ -2484,6 +2495,12 @@ extern struct drm_property *drm_mode_create_rotation_property(struct drm_device
 extern unsigned int drm_rotation_simplify(unsigned int rotation,
 					  unsigned int supported_rotations);
 
+extern int drm_mode_create_zpos_property(struct drm_device *dev,
+					 unsigned int min, unsigned int max);
+extern int drm_mode_create_zpos_immutable_property(struct drm_device *dev,
+						   unsigned int min,
+						   unsigned int max);
+
 /* Helpers */
 
 static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
-- 
1.9.2

[PATCH v4 2/3] drm/exynos: use generic code for managing zpos plane property

[Marek Szyprowski]

This patch replaces zpos property handling custom code in Exynos DRM
driver with calls to generic DRM code.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.h   |  2 -
 drivers/gpu/drm/exynos/exynos_drm_plane.c | 68 ++++++++-----------------------
 drivers/gpu/drm/exynos/exynos_mixer.c     |  6 ++-
 3 files changed, 20 insertions(+), 56 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 17b5ded72ff1..816537886e4e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -64,7 +64,6 @@ struct exynos_drm_plane_state {
 	struct exynos_drm_rect src;
 	unsigned int h_ratio;
 	unsigned int v_ratio;
-	unsigned int zpos;
 };
 
 static inline struct exynos_drm_plane_state *
@@ -217,7 +216,6 @@ struct exynos_drm_private {
 	 * this array is used to be aware of which crtc did it request vblank.
 	 */
 	struct drm_crtc *crtc[MAX_CRTC];
-	struct drm_property *plane_zpos_property;
 
 	unsigned long da_start;
 	unsigned long da_space_size;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index d86227236f55..3a486939168e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -137,9 +137,9 @@ static void exynos_drm_plane_reset(struct drm_plane *plane)
 
 	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 	if (exynos_state) {
-		exynos_state->zpos = exynos_plane->config->zpos;
 		plane->state = &exynos_state->base;
 		plane->state->plane = plane;
+		plane->state->zpos = exynos_plane->config->zpos;
 	}
 }
 
@@ -155,7 +155,6 @@ exynos_drm_plane_duplicate_state(struct drm_plane *plane)
 		return NULL;
 
 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
-	copy->zpos = exynos_state->zpos;
 	return &copy->base;
 }
 
@@ -168,43 +167,6 @@ static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
 	kfree(old_exynos_state);
 }
 
-static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane,
-						struct drm_plane_state *state,
-						struct drm_property *property,
-						uint64_t val)
-{
-	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
-	struct exynos_drm_plane_state *exynos_state =
-					to_exynos_plane_state(state);
-	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
-	const struct exynos_drm_plane_config *config = exynos_plane->config;
-
-	if (property == dev_priv->plane_zpos_property &&
-	    (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS))
-		exynos_state->zpos = val;
-	else
-		return -EINVAL;
-
-	return 0;
-}
-
-static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane,
-					  const struct drm_plane_state *state,
-					  struct drm_property *property,
-					  uint64_t *val)
-{
-	const struct exynos_drm_plane_state *exynos_state =
-		container_of(state, const struct exynos_drm_plane_state, base);
-	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
-
-	if (property == dev_priv->plane_zpos_property)
-		*val = exynos_state->zpos;
-	else
-		return -EINVAL;
-
-	return 0;
-}
-
 static struct drm_plane_funcs exynos_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
@@ -213,8 +175,6 @@ static struct drm_plane_funcs exynos_plane_funcs = {
 	.reset		= exynos_drm_plane_reset,
 	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 	.atomic_destroy_state = exynos_drm_plane_destroy_state,
-	.atomic_set_property = exynos_drm_plane_atomic_set_property,
-	.atomic_get_property = exynos_drm_plane_atomic_get_property,
 };
 
 static int
@@ -302,20 +262,23 @@ static const struct drm_plane_helper_funcs plane_helper_funcs = {
 };
 
 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
-					      unsigned int zpos)
+					      unsigned int zpos, bool immutable)
 {
 	struct drm_device *dev = plane->dev;
-	struct exynos_drm_private *dev_priv = dev->dev_private;
 	struct drm_property *prop;
 
-	prop = dev_priv->plane_zpos_property;
-	if (!prop) {
-		prop = drm_property_create_range(dev, 0, "zpos",
-						 0, MAX_PLANE - 1);
-		if (!prop)
-			return;
-
-		dev_priv->plane_zpos_property = prop;
+	if (immutable) {
+		if (!dev->mode_config.zpos_immutable_property)
+			if (drm_mode_create_zpos_immutable_property(dev, 0,
+								MAX_PLANE - 1))
+				return;
+		prop = dev->mode_config.zpos_immutable_property;
+	} else {
+		if (!dev->mode_config.zpos_property)
+			if (drm_mode_create_zpos_property(dev, 0,
+							  MAX_PLANE - 1))
+				return;
+		prop = dev->mode_config.zpos_property;
 	}
 
 	drm_object_attach_property(&plane->base, prop, zpos);
@@ -344,7 +307,8 @@ int exynos_plane_init(struct drm_device *dev,
 	exynos_plane->index = index;
 	exynos_plane->config = config;
 
-	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos);
+	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
+			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index b5fbc1cbf024..d00c201773c9 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -478,6 +478,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
 	struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
 	struct mixer_resources *res = &ctx->mixer_res;
 	struct drm_framebuffer *fb = state->base.fb;
+	unsigned int priority = state->base.normalized_zpos + 1;
 	unsigned long flags;
 	dma_addr_t luma_addr[2], chroma_addr[2];
 	bool tiled_mode = false;
@@ -562,7 +563,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
 
 	mixer_cfg_scan(ctx, mode->vdisplay);
 	mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
-	mixer_cfg_layer(ctx, plane->index, state->zpos + 1, true);
+	mixer_cfg_layer(ctx, plane->index, priority, true);
 	mixer_cfg_vp_blend(ctx);
 	mixer_run(ctx);
 
@@ -587,6 +588,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
 	struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
 	struct mixer_resources *res = &ctx->mixer_res;
 	struct drm_framebuffer *fb = state->base.fb;
+	unsigned int priority = state->base.normalized_zpos + 1;
 	unsigned long flags;
 	unsigned int win = plane->index;
 	unsigned int x_ratio = 0, y_ratio = 0;
@@ -678,7 +680,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
 
 	mixer_cfg_scan(ctx, mode->vdisplay);
 	mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
-	mixer_cfg_layer(ctx, win, state->zpos + 1, true);
+	mixer_cfg_layer(ctx, win, priority, true);
 	mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
 
 	/* layer update mandatory for mixer 16.0.33.0 */
-- 
1.9.2

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[PATCH v4 3/3] drm: simplify initialization of rotation property

[Marek Szyprowski]

This patch simplifies initialization of generic rotation property and
aligns the code to match recently introduced function for intializing
generic zpos property. It also adds missing documentation.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 10 ++++-----
 drivers/gpu/drm/drm_crtc.c                      | 29 ++++++++++++++++++++-----
 drivers/gpu/drm/i915/intel_display.c            |  6 ++---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c       |  3 +--
 drivers/gpu/drm/omapdrm/omap_drv.c              |  3 +--
 include/drm/drm_crtc.h                          |  4 ++--
 6 files changed, 33 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index 1ffe9c329c46..4f9606cdf0f2 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -967,12 +967,10 @@ atmel_hlcdc_plane_create_properties(struct drm_device *dev)
 	if (!props->alpha)
 		return ERR_PTR(-ENOMEM);
 
-	dev->mode_config.rotation_property =
-			drm_mode_create_rotation_property(dev,
-							  BIT(DRM_ROTATE_0) |
-							  BIT(DRM_ROTATE_90) |
-							  BIT(DRM_ROTATE_180) |
-							  BIT(DRM_ROTATE_270));
+	drm_mode_create_rotation_property(dev, BIT(DRM_ROTATE_0) |
+					       BIT(DRM_ROTATE_90) |
+					       BIT(DRM_ROTATE_180) |
+					       BIT(DRM_ROTATE_270));
 	if (!dev->mode_config.rotation_property)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index c6f7238cdab3..3e2ba57de16b 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5861,10 +5861,23 @@ void drm_mode_config_cleanup(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_mode_config_cleanup);
 
-struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
-						       unsigned int supported_rotations)
+/**
+ * drm_mode_create_rotation_property - create generic rotation property
+ * @dev: DRM device
+ * @supported_rotations: bitmask of supported rotation modes
+ *
+ * This function initializes generic rotation property and enables support
+ * for it in drm core. Drivers can then attach this property to planes to enable
+ * support for different rotation modes.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_create_rotation_property(struct drm_device *dev,
+				      unsigned int supported_rotations)
 {
-	static const struct drm_prop_enum_list props[] = {
+	struct drm_property *prop;
+	static const struct drm_prop_enum_list values[] = {
 		{ DRM_ROTATE_0,   "rotate-0" },
 		{ DRM_ROTATE_90,  "rotate-90" },
 		{ DRM_ROTATE_180, "rotate-180" },
@@ -5873,9 +5886,13 @@ struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
 		{ DRM_REFLECT_Y,  "reflect-y" },
 	};
 
-	return drm_property_create_bitmask(dev, 0, "rotation",
-					   props, ARRAY_SIZE(props),
-					   supported_rotations);
+	prop = drm_property_create_bitmask(dev, 0, "rotation", values,
+				ARRAY_SIZE(values), supported_rotations);
+	if (!prop)
+		return -ENOMEM;
+
+	dev->mode_config.rotation_property = prop;
+	return 0;
 }
 EXPORT_SYMBOL(drm_mode_create_rotation_property);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 02f6ccb848a9..5b7ba46491a0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14042,8 +14042,7 @@ void intel_create_rotation_property(struct drm_device *dev, struct intel_plane *
 		if (INTEL_INFO(dev)->gen >= 9)
 			flags |= BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270);
 
-		dev->mode_config.rotation_property =
-			drm_mode_create_rotation_property(dev, flags);
+		drm_mode_create_rotation_property(dev, flags);
 	}
 	if (dev->mode_config.rotation_property)
 		drm_object_attach_property(&plane->base.base,
@@ -14179,8 +14178,7 @@ static struct drm_plane *intel_cursor_plane_create(struct drm_device *dev,
 
 	if (INTEL_INFO(dev)->gen >= 4) {
 		if (!dev->mode_config.rotation_property)
-			dev->mode_config.rotation_property =
-				drm_mode_create_rotation_property(dev,
+			drm_mode_create_rotation_property(dev,
 							BIT(DRM_ROTATE_0) |
 							BIT(DRM_ROTATE_180));
 		if (dev->mode_config.rotation_property)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
index 432c09836b0e..8defeec0d453 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
@@ -76,8 +76,7 @@ static void mdp5_plane_install_rotation_property(struct drm_device *dev,
 		return;
 
 	if (!dev->mode_config.rotation_property)
-		dev->mode_config.rotation_property =
-			drm_mode_create_rotation_property(dev,
+		drm_mode_create_rotation_property(dev,
 			BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y));
 
 	if (dev->mode_config.rotation_property)
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index dfafdb602ad2..c6ce2b31f1c5 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -304,8 +304,7 @@ static int omap_modeset_init_properties(struct drm_device *dev)
 	struct omap_drm_private *priv = dev->dev_private;
 
 	if (priv->has_dmm) {
-		dev->mode_config.rotation_property =
-			drm_mode_create_rotation_property(dev,
+		drm_mode_create_rotation_property(dev,
 				BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) |
 				BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270) |
 				BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y));
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index f53cdda1167b..1cd22f38b50d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -2490,8 +2490,8 @@ extern int drm_format_plane_cpp(uint32_t format, int plane);
 extern int drm_format_horz_chroma_subsampling(uint32_t format);
 extern int drm_format_vert_chroma_subsampling(uint32_t format);
 extern const char *drm_get_format_name(uint32_t format);
-extern struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
-							      unsigned int supported_rotations);
+extern int drm_mode_create_rotation_property(struct drm_device *dev,
+					     unsigned int supported_rotations);
 extern unsigned int drm_rotation_simplify(unsigned int rotation,
 					  unsigned int supported_rotations);
 
-- 
1.9.2