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From:   Jessica Zhang <quic_jesszhan@quicinc.com>
Date:   Fri, 28 Jul 2023 10:02:10 -0700
Subject: [PATCH RFC v5 01/10] drm: Introduce pixel_source DRM plane
 property
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Message-ID: <20230728-solid-fill-v5-1-053dbefa909c@quicinc.com>
References: <20230728-solid-fill-v5-0-053dbefa909c@quicinc.com>
In-Reply-To: <20230728-solid-fill-v5-0-053dbefa909c@quicinc.com>
To:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Clark <robdclark@gmail.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        "Sean Paul" <sean@poorly.run>,
        Marijn Suijten <marijn.suijten@somainline.org>
CC:     <quic_abhinavk@quicinc.com>, <ppaalanen@gmail.com>,
        <contact@emersion.fr>, <laurent.pinchart@ideasonboard.com>,
        <sebastian.wick@redhat.com>, <ville.syrjala@linux.intel.com>,
        <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-msm@vger.kernel.org>, <freedreno@lists.freedesktop.org>,
        <wayland-devel@lists.freedesktop.org>,
        Jessica Zhang <quic_jesszhan@quicinc.com>
Precedence: bulk

Add support for pixel_source property to drm_plane and related
documentation. In addition, force pixel_source to
DRM_PLANE_PIXEL_SOURCE_FB in DRM_IOCTL_MODE_SETPLANE as to not break
legacy userspace.

This enum property will allow user to specify a pixel source for the
plane. Possible pixel sources will be defined in the
drm_plane_pixel_source enum.

The current possible pixel sources are DRM_PLANE_PIXEL_SOURCE_NONE and
DRM_PLANE_PIXEL_SOURCE_FB with *_PIXEL_SOURCE_FB being the default value.

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
---
 drivers/gpu/drm/drm_atomic_state_helper.c |  1 +
 drivers/gpu/drm/drm_atomic_uapi.c         |  4 ++
 drivers/gpu/drm/drm_blend.c               | 85 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_plane.c               |  3 ++
 include/drm/drm_blend.h                   |  2 +
 include/drm/drm_plane.h                   | 21 ++++++++
 6 files changed, 116 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 784e63d70a42..01638c51ce0a 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -252,6 +252,7 @@ void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
 
 	plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
 	plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
+	plane_state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;
 
 	if (plane->color_encoding_property) {
 		if (!drm_object_property_get_default_value(&plane->base,
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index d867e7f9f2cd..454f980e16c9 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -544,6 +544,8 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
 		state->src_w = val;
 	} else if (property == config->prop_src_h) {
 		state->src_h = val;
+	} else if (property == plane->pixel_source_property) {
+		state->pixel_source = val;
 	} else if (property == plane->alpha_property) {
 		state->alpha = val;
 	} else if (property == plane->blend_mode_property) {
@@ -616,6 +618,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
 		*val = state->src_w;
 	} else if (property == config->prop_src_h) {
 		*val = state->src_h;
+	} else if (property == plane->pixel_source_property) {
+		*val = state->pixel_source;
 	} else if (property == plane->alpha_property) {
 		*val = state->alpha;
 	} else if (property == plane->blend_mode_property) {
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
index 6e74de833466..c500310a3d09 100644
--- a/drivers/gpu/drm/drm_blend.c
+++ b/drivers/gpu/drm/drm_blend.c
@@ -185,6 +185,21 @@
  *		 plane does not expose the "alpha" property, then this is
  *		 assumed to be 1.0
  *
+ * pixel_source:
+ *	pixel_source is set up with drm_plane_create_pixel_source_property().
+ *	It is used to toggle the active source of pixel data for the plane.
+ *	The plane will only display data from the set pixel_source -- any
+ *	data from other sources will be ignored.
+ *
+ *	Possible values:
+ *
+ *	"NONE":
+ *		No active pixel source.
+ *		Committing with a NONE pixel source will disable the plane.
+ *
+ *	"FB":
+ *		Framebuffer source set by the "FB_ID" property.
+ *
  * Note that all the property extensions described here apply either to the
  * plane or the CRTC (e.g. for the background color, which currently is not
  * exposed and assumed to be black).
@@ -615,3 +630,73 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane,
 	return 0;
 }
 EXPORT_SYMBOL(drm_plane_create_blend_mode_property);
+
+/**
+ * drm_plane_create_pixel_source_property - create a new pixel source property
+ * @plane: DRM plane
+ * @extra_sources: Bitmask of additional supported pixel_sources for the driver.
+ *		   DRM_PLANE_PIXEL_SOURCE_FB always be enabled as a supported
+ *		   source.
+ *
+ * This creates a new property describing the current source of pixel data for the
+ * plane. The pixel_source will be initialized as DRM_PLANE_PIXEL_SOURCE_FB by default.
+ *
+ * Drivers can set a custom default source by overriding the pixel_source value in
+ * drm_plane_funcs.reset()
+ *
+ * The property is exposed to userspace as an enumeration property called
+ * "pixel_source" and has the following enumeration values:
+ *
+ * "NONE":
+ *	 No active pixel source
+ *
+ * "FB":
+ *	Framebuffer pixel source
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_plane_create_pixel_source_property(struct drm_plane *plane,
+					   unsigned long extra_sources)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_property *prop;
+	static const struct drm_prop_enum_list enum_list[] = {
+		{ DRM_PLANE_PIXEL_SOURCE_NONE, "NONE" },
+		{ DRM_PLANE_PIXEL_SOURCE_FB, "FB" },
+	};
+	static const unsigned int valid_source_mask = BIT(DRM_PLANE_PIXEL_SOURCE_FB);
+	int i;
+
+	/* FB is supported by default */
+	unsigned long supported_sources = extra_sources | BIT(DRM_PLANE_PIXEL_SOURCE_FB);
+
+	if (WARN_ON(supported_sources & ~valid_source_mask))
+		return -EINVAL;
+
+	prop = drm_property_create(dev, DRM_MODE_PROP_ENUM | DRM_MODE_PROP_ATOMIC, "pixel_source",
+			hweight32(supported_sources));
+
+	if (!prop)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(enum_list); i++) {
+		int ret;
+
+		if (!test_bit(enum_list[i].type, &supported_sources))
+			continue;
+
+		ret = drm_property_add_enum(prop, enum_list[i].type, enum_list[i].name);
+		if (ret) {
+			drm_property_destroy(dev, prop);
+
+			return ret;
+		}
+	}
+
+	drm_object_attach_property(&plane->base, prop, DRM_PLANE_PIXEL_SOURCE_FB);
+	plane->pixel_source_property = prop;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_pixel_source_property);
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 24e7998d1731..f342cf15412b 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -987,6 +987,9 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
 		return -ENOENT;
 	}
 
+	if (plane->state && plane->state->pixel_source != DRM_PLANE_PIXEL_SOURCE_FB)
+		plane->state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;
+
 	if (plane_req->fb_id) {
 		fb = drm_framebuffer_lookup(dev, file_priv, plane_req->fb_id);
 		if (!fb) {
diff --git a/include/drm/drm_blend.h b/include/drm/drm_blend.h
index 88bdfec3bd88..122bbfbaae33 100644
--- a/include/drm/drm_blend.h
+++ b/include/drm/drm_blend.h
@@ -58,4 +58,6 @@ int drm_atomic_normalize_zpos(struct drm_device *dev,
 			      struct drm_atomic_state *state);
 int drm_plane_create_blend_mode_property(struct drm_plane *plane,
 					 unsigned int supported_modes);
+int drm_plane_create_pixel_source_property(struct drm_plane *plane,
+					   unsigned long extra_sources);
 #endif
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 51291983ea44..89508b4dea4a 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -40,6 +40,12 @@ enum drm_scaling_filter {
 	DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
 };
 
+enum drm_plane_pixel_source {
+	DRM_PLANE_PIXEL_SOURCE_NONE,
+	DRM_PLANE_PIXEL_SOURCE_FB,
+	DRM_PLANE_PIXEL_SOURCE_MAX
+};
+
 /**
  * struct drm_plane_state - mutable plane state
  *
@@ -116,6 +122,14 @@ struct drm_plane_state {
 	/** @src_h: height of visible portion of plane (in 16.16) */
 	uint32_t src_h, src_w;
 
+	/**
+	 * @pixel_source:
+	 *
+	 * Source of pixel information for the plane. See
+	 * drm_plane_create_pixel_source_property() for more details.
+	 */
+	enum drm_plane_pixel_source pixel_source;
+
 	/**
 	 * @alpha:
 	 * Opacity of the plane with 0 as completely transparent and 0xffff as
@@ -699,6 +713,13 @@ struct drm_plane {
 	 */
 	struct drm_plane_state *state;
 
+	/*
+	 * @pixel_source_property:
+	 * Optional pixel_source property for this plane. See
+	 * drm_plane_create_pixel_source_property().
+	 */
+	struct drm_property *pixel_source_property;
+
 	/**
 	 * @alpha_property:
 	 * Optional alpha property for this plane. See

-- 
2.41.0