drm/vkms: Add basic CRTC initialization

This commit adds the essential infrastructure for around CRTCs which
is composed of: a new data struct for output data information, a
function for creating planes, and a simple encoder attached to the
connector. Finally, due to the introduction of a new initialization
function, connectors were moved from vkms_drv.c to vkms_display.c.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Reviewed-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b6e27bc6a54f5cb340658fa5969f7b48fbfbf1b7.1526514457.git.rodrigosiqueiramelo@gmail.com

drivers/gpu/drm/vkms/Makefile

-vkms-y := vkms_drv.o
+vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o
 
 obj-$(CONFIG_DRM_VKMS) += vkms.o

drivers/gpu/drm/vkms/vkms_crtc.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "vkms_drv.h"
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+
+static const struct drm_crtc_funcs vkms_crtc_funcs = {
+	.set_config             = drm_atomic_helper_set_config,
+	.destroy                = drm_crtc_cleanup,
+	.page_flip              = drm_atomic_helper_page_flip,
+	.reset                  = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
+};
+
+int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
+		   struct drm_plane *primary, struct drm_plane *cursor)
+{
+	int ret;
+
+	ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
+					&vkms_crtc_funcs, NULL);
+	if (ret) {
+		DRM_ERROR("Failed to init CRTC\n");
+		return ret;
+	}
+
+	return ret;
+}

drivers/gpu/drm/vkms/vkms_drv.c

@@ -6,7 +6,6 @@
  */
 
 #include <linux/module.h>
-#include <drm/drmP.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_atomic_helper.h>
@@ -59,25 +58,24 @@ static struct drm_driver vkms_driver = {
 	.minor			= DRIVER_MINOR,
 };
 
-static const u32 vkms_formats[] = {
-	DRM_FORMAT_XRGB8888,
+static const struct drm_mode_config_funcs vkms_mode_funcs = {
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
-static void vkms_connector_destroy(struct drm_connector *connector)
+static int vkms_modeset_init(struct vkms_device *vkmsdev)
 {
-	drm_connector_unregister(connector);
-	drm_connector_cleanup(connector);
-}
+	struct drm_device *dev = &vkmsdev->drm;
 
-static const struct drm_connector_funcs vkms_connector_funcs = {
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = vkms_connector_destroy,
-};
+	drm_mode_config_init(dev);
+	dev->mode_config.funcs = &vkms_mode_funcs;
+	dev->mode_config.min_width = XRES_MIN;
+	dev->mode_config.min_height = YRES_MIN;
+	dev->mode_config.max_width = XRES_MAX;
+	dev->mode_config.max_height = YRES_MAX;
 
-static const struct drm_mode_config_funcs vkms_mode_funcs = {
-	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = drm_atomic_helper_commit,
-};
+	return vkms_output_init(vkmsdev);
+}
 
 static int __init vkms_init(void)
 {
@@ -98,48 +96,24 @@ static int __init vkms_init(void)
 		goto out_fini;
 	}
 
-	drm_mode_config_init(&vkms_device->drm);
-	vkms_device->drm.mode_config.funcs = &vkms_mode_funcs;
-	vkms_device->drm.mode_config.min_width = XRES_MIN;
-	vkms_device->drm.mode_config.min_height = YRES_MIN;
-	vkms_device->drm.mode_config.max_width = XRES_MAX;
-	vkms_device->drm.mode_config.max_height = YRES_MAX;
-
-	ret = drm_connector_init(&vkms_device->drm, &vkms_device->connector,
-				 &vkms_connector_funcs,
-				 DRM_MODE_CONNECTOR_VIRTUAL);
-	if (ret < 0) {
-		DRM_ERROR("Failed to init connector\n");
-		goto out_unregister;
-	}
-
-	ret = drm_simple_display_pipe_init(&vkms_device->drm,
-					   &vkms_device->pipe,
-					   NULL,
-					   vkms_formats,
-					   ARRAY_SIZE(vkms_formats),
-					   NULL,
-					   &vkms_device->connector);
-	if (ret < 0) {
-		DRM_ERROR("Cannot setup simple display pipe\n");
+	ret = vkms_modeset_init(vkms_device);
+	if (ret)
 		goto out_unregister;
-	}
 
 	ret = drm_dev_register(&vkms_device->drm, 0);
 	if (ret)
 		goto out_unregister;
 
-	drm_connector_register(&vkms_device->connector);
-
 	return 0;
 
 out_unregister:
 	platform_device_unregister(vkms_device->platform);
+
 out_fini:
 	drm_dev_fini(&vkms_device->drm);
+
 out_free:
 	kfree(vkms_device);
-
 	return ret;
 }
 

drivers/gpu/drm/vkms/vkms_drv.h

 #ifndef _VKMS_DRV_H_
 #define _VKMS_DRV_H_
 
-#include <drm/drm_simple_kms_helper.h>
+#include <drm/drmP.h>
+#include <drm/drm.h>
+#include <drm/drm_encoder.h>
+
+static const u32 vkms_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+struct vkms_output {
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
 
 struct vkms_device {
 	struct drm_device drm;
 	struct platform_device *platform;
-	struct drm_simple_display_pipe pipe;
-	struct drm_connector connector;
+	struct vkms_output output;
 };
 
+int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
+		   struct drm_plane *primary, struct drm_plane *cursor);
+
+int vkms_output_init(struct vkms_device *vkmsdev);
+
+struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev);
+
 #endif /* _VKMS_DRV_H_ */

drivers/gpu/drm/vkms/vkms_output.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "vkms_drv.h"
+#include <drm/drm_crtc_helper.h>
+
+static void vkms_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs vkms_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = vkms_connector_destroy,
+};
+
+static const struct drm_encoder_funcs vkms_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+int vkms_output_init(struct vkms_device *vkmsdev)
+{
+	struct vkms_output *output = &vkmsdev->output;
+	struct drm_device *dev = &vkmsdev->drm;
+	struct drm_connector *connector = &output->connector;
+	struct drm_encoder *encoder = &output->encoder;
+	struct drm_crtc *crtc = &output->crtc;
+	struct drm_plane *primary;
+	int ret;
+
+	primary = vkms_plane_init(vkmsdev);
+	if (IS_ERR(primary))
+		return PTR_ERR(primary);
+
+	ret = vkms_crtc_init(dev, crtc, primary, NULL);
+	if (ret)
+		goto err_crtc;
+
+	ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
+				 DRM_MODE_CONNECTOR_VIRTUAL);
+	if (ret) {
+		DRM_ERROR("Failed to init connector\n");
+		goto err_connector;
+	}
+
+	ret = drm_connector_register(connector);
+	if (ret) {
+		DRM_ERROR("Failed to register connector\n");
+		goto err_connector_register;
+	}
+
+	ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
+			       DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (ret) {
+		DRM_ERROR("Failed to init encoder\n");
+		goto err_encoder;
+	}
+	encoder->possible_crtcs = 1;
+
+	ret = drm_mode_connector_attach_encoder(connector, encoder);
+	if (ret) {
+		DRM_ERROR("Failed to attach connector to encoder\n");
+		goto err_attach;
+	}
+
+	drm_mode_config_reset(dev);
+
+	return 0;
+
+err_attach:
+	drm_encoder_cleanup(encoder);
+
+err_encoder:
+	drm_connector_unregister(connector);
+
+err_connector_register:
+	drm_connector_cleanup(connector);
+
+err_connector:
+	drm_crtc_cleanup(crtc);
+
+err_crtc:
+	drm_plane_cleanup(primary);
+	return ret;
+}

drivers/gpu/drm/vkms/vkms_plane.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "vkms_drv.h"
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+static const struct drm_plane_funcs vkms_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy		= drm_plane_cleanup,
+	.reset			= drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev)
+{
+	struct drm_device *dev = &vkmsdev->drm;
+	struct drm_plane *plane;
+	const u32 *formats;
+	int ret, nformats;
+
+	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return ERR_PTR(-ENOMEM);
+
+	formats = vkms_formats;
+	nformats = ARRAY_SIZE(vkms_formats);
+
+	ret = drm_universal_plane_init(dev, plane, 0,
+				       &vkms_plane_funcs,
+				       formats, nformats,
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		kfree(plane);
+		return ERR_PTR(ret);
+	}
+
+	return plane;
+}