linux-kernel - [PATCH v3 06/16] drm/vkms: Introduce config for plane rotation

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Message-Id: <20250121-google-remove-crtc-index-from-parameter-v3-6-cac00a3c3544@bootlin.com>
Date: Tue, 21 Jan 2025 11:55:30 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: arthurgrillo@...eup.net, jeremie.dautheribes@...tlin.com, 
 miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com, 
 seanpaul@...gle.com, nicolejadeyee@...gle.com, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH v3 06/16] drm/vkms: Introduce config for plane rotation

VKMS driver supports all the rotation on planes, but for testing it can be
useful to only advertise few of them. This new configuration interface
will allow configuring the rotation per planes.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_config.c | 9 +++++++++
 drivers/gpu/drm/vkms/vkms_config.h | 4 ++++
 drivers/gpu/drm/vkms/vkms_plane.c  | 5 +++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
index 0caa6bfccb5e409efa37ea48a52299e0dc132728..c7a39cde8cfbcd0ff4f5ae137cfb709b7a2240e2 100644
--- a/drivers/gpu/drm/vkms/vkms_config.c
+++ b/drivers/gpu/drm/vkms/vkms_config.c
@@ -82,6 +82,8 @@ struct vkms_config_plane *vkms_config_create_plane(struct vkms_config *vkms_conf
 		return NULL;
 
 	vkms_config_overlay->type = DRM_PLANE_TYPE_OVERLAY;
+	vkms_config_overlay->supported_rotations = DRM_MODE_ROTATE_MASK | DRM_MODE_REFLECT_MASK;
+	vkms_config_overlay->default_rotation = DRM_MODE_ROTATE_0;
 
 	list_add(&vkms_config_overlay->link, &vkms_config->planes);
 
@@ -118,6 +120,11 @@ bool vkms_config_is_valid(struct vkms_config *config)
 	bool has_primary = false;
 
 	list_for_each_entry(config_plane, &config->planes, link) {
+		// Default rotation not in supported rotations
+		if ((config_plane->default_rotation & config_plane->supported_rotations) !=
+		    config_plane->default_rotation)
+			return false;
+
 		if (config_plane->type == DRM_PLANE_TYPE_PRIMARY) {
 			// Multiple primary planes for only one CRTC
 			if (has_primary)
@@ -151,6 +158,8 @@ static int vkms_config_show(struct seq_file *m, void *data)
 		seq_puts(m, "plane:\n");
 		seq_printf(m, "\tname: %s\n", config_plane->name);
 		seq_printf(m, "\ttype: %d\n", config_plane->type);
+		seq_printf(m, "\tsupported rotations: 0x%x\n", config_plane->supported_rotations);
+		seq_printf(m, "\tdefault rotation: 0x%x\n", config_plane->default_rotation);
 	}
 
 	return 0;
diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
index 3e70bce8d4f7b06f44ec79b3a3d8e6897f9a44c7..fd5e0df11647f145d53e71a1b6a244951af3ec0d 100644
--- a/drivers/gpu/drm/vkms/vkms_config.h
+++ b/drivers/gpu/drm/vkms/vkms_config.h
@@ -30,6 +30,8 @@ struct vkms_config {
  * @name: Name of the plane
  * @type: Type of the plane. The creator of configuration needs to ensures that at least one
  *        plane is primary.
+ * @default_rotation: Default rotation that should be used by this plane
+ * @supported_rotation: Rotation that this plane will support
  * @plane: Internal usage. This pointer should never be considered as valid. It can be used to
  *         store a temporary reference to a vkms plane during device creation. This pointer is
  *         not managed by the configuration and must be managed by other means.
@@ -39,6 +41,8 @@ struct vkms_config_plane {
 
 	char *name;
 	enum drm_plane_type type;
+	unsigned int default_rotation;
+	unsigned int supported_rotations;
 
 	/* Internal usage */
 	struct vkms_plane *plane;
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index b3a9a42476ef340986c8961f076236d76a7c73e3..c23ac8687dedaa956cfd6622321f1026521ff13f 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -202,8 +202,9 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 
 	drm_plane_helper_add(&plane->base, &vkms_plane_helper_funcs);
 
-	drm_plane_create_rotation_property(&plane->base, DRM_MODE_ROTATE_0,
-					   DRM_MODE_ROTATE_MASK | DRM_MODE_REFLECT_MASK);
+	drm_plane_create_rotation_property(&plane->base,
+					   config->default_rotation,
+					   config->supported_rotations);
 
 	return plane;
 }

-- 
2.47.1