drm/gud: Replace simple display pipe with DRM atomic helpers

The simple display pipe is obsolete and the atomic helpers allow for
more control over the rendering process. As such, this patch replaces
the old simple display pipe system with the newer atomic helpers.

As the code is mainly the same, merely replaced with the new atomic
system, there should be no change in functionality.

Signed-off-by: Ruben Wauters <rubenru09@aol.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250818193553.2162-1-rubenru09@aol.com

drivers/gpu/drm/gud/gud_connector.c

@@ -16,7 +16,6 @@
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
-#include <drm/drm_simple_kms_helper.h>
 #include <drm/gud.h>
 
 #include "gud_internal.h"
@@ -607,13 +606,16 @@ int gud_connector_fill_properties(struct drm_connector_state *connector_state,
 	return gconn->num_properties;
 }
 
+static const struct drm_encoder_funcs gud_drm_simple_encoder_funcs_cleanup = {
+	.destroy = drm_encoder_cleanup,
+};
+
 static int gud_connector_create(struct gud_device *gdrm, unsigned int index,
 				struct gud_connector_descriptor_req *desc)
 {
 	struct drm_device *drm = &gdrm->drm;
 	struct gud_connector *gconn;
 	struct drm_connector *connector;
-	struct drm_encoder *encoder;
 	int ret, connector_type;
 	u32 flags;
 
@@ -681,20 +683,13 @@ static int gud_connector_create(struct gud_device *gdrm, unsigned int index,
 		return ret;
 	}
 
-	/* The first connector is attached to the existing simple pipe encoder */
-	if (!connector->index) {
-		encoder = &gdrm->pipe.encoder;
-	} else {
-		encoder = &gconn->encoder;
+	gconn->encoder.possible_crtcs = drm_crtc_mask(&gdrm->crtc);
+	ret = drm_encoder_init(drm, &gconn->encoder, &gud_drm_simple_encoder_funcs_cleanup,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
 
-		ret = drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
-		if (ret)
-			return ret;
-
-		encoder->possible_crtcs = 1;
-	}
-
-	return drm_connector_attach_encoder(connector, encoder);
+	return drm_connector_attach_encoder(connector, &gconn->encoder);
 }
 
 int gud_get_connectors(struct gud_device *gdrm)

drivers/gpu/drm/gud/gud_drv.c

@@ -16,6 +16,7 @@
 #include <drm/clients/drm_client_setup.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_blend.h>
+#include <drm/drm_crtc_helper.h>
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_drv.h>
@@ -27,7 +28,6 @@
 #include <drm/drm_managed.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
-#include <drm/drm_simple_kms_helper.h>
 #include <drm/gud.h>
 
 #include "gud_internal.h"
@@ -289,7 +289,7 @@ static int gud_get_properties(struct gud_device *gdrm)
 			 * but mask out any additions on future devices.
 			 */
 			val &= GUD_ROTATION_MASK;
-			ret = drm_plane_create_rotation_property(&gdrm->pipe.plane,
+			ret = drm_plane_create_rotation_property(&gdrm->plane,
 								 DRM_MODE_ROTATE_0, val);
 			break;
 		default:
@@ -338,10 +338,30 @@ static int gud_stats_debugfs(struct seq_file *m, void *data)
 	return 0;
 }
 
-static const struct drm_simple_display_pipe_funcs gud_pipe_funcs = {
-	.check      = gud_pipe_check,
-	.update	    = gud_pipe_update,
-	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS
+static const struct drm_crtc_helper_funcs gud_crtc_helper_funcs = {
+	.atomic_check = drm_crtc_helper_atomic_check
+};
+
+static const struct drm_crtc_funcs gud_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs gud_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = gud_plane_atomic_check,
+	.atomic_update = gud_plane_atomic_update,
+};
+
+static const struct drm_plane_funcs gud_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	DRM_GEM_SHADOW_PLANE_FUNCS,
 };
 
 static const struct drm_mode_config_funcs gud_mode_config_funcs = {
@@ -350,7 +370,7 @@ static const struct drm_mode_config_funcs gud_mode_config_funcs = {
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
-static const u64 gud_pipe_modifiers[] = {
+static const u64 gud_plane_modifiers[] = {
 	DRM_FORMAT_MOD_LINEAR,
 	DRM_FORMAT_MOD_INVALID
 };
@@ -567,12 +587,17 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 			return -ENOMEM;
 	}
 
-	ret = drm_simple_display_pipe_init(drm, &gdrm->pipe, &gud_pipe_funcs,
-					   formats, num_formats,
-					   gud_pipe_modifiers, NULL);
+	ret = drm_universal_plane_init(drm, &gdrm->plane, 0,
+				       &gud_plane_funcs,
+				       formats, num_formats,
+				       gud_plane_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
 	if (ret)
 		return ret;
 
+	drm_plane_helper_add(&gdrm->plane, &gud_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(&gdrm->plane);
+
 	devm_kfree(dev, formats);
 	devm_kfree(dev, formats_dev);
 
@@ -582,7 +607,12 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		return ret;
 	}
 
-	drm_plane_enable_fb_damage_clips(&gdrm->pipe.plane);
+	ret = drm_crtc_init_with_planes(drm, &gdrm->crtc, &gdrm->plane, NULL,
+					&gud_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+
+	drm_crtc_helper_add(&gdrm->crtc, &gud_crtc_helper_funcs);
 
 	ret = gud_get_connectors(gdrm);
 	if (ret) {

drivers/gpu/drm/gud/gud_internal.h

@@ -11,11 +11,11 @@
 #include <uapi/drm/drm_fourcc.h>
 
 #include <drm/drm_modes.h>
-#include <drm/drm_simple_kms_helper.h>
 
 struct gud_device {
 	struct drm_device drm;
-	struct drm_simple_display_pipe pipe;
+	struct drm_plane plane;
+	struct drm_crtc crtc;
 	struct work_struct work;
 	u32 flags;
 	const struct drm_format_info *xrgb8888_emulation_format;
@@ -62,11 +62,10 @@ int gud_usb_set_u8(struct gud_device *gdrm, u8 request, u8 val);
 
 void gud_clear_damage(struct gud_device *gdrm);
 void gud_flush_work(struct work_struct *work);
-int gud_pipe_check(struct drm_simple_display_pipe *pipe,
-		   struct drm_plane_state *new_plane_state,
-		   struct drm_crtc_state *new_crtc_state);
-void gud_pipe_update(struct drm_simple_display_pipe *pipe,
-		     struct drm_plane_state *old_state);
+int gud_plane_atomic_check(struct drm_plane *plane,
+			   struct drm_atomic_state *state);
+void gud_plane_atomic_update(struct drm_plane *plane,
+			     struct drm_atomic_state *atomic_state);
 int gud_connector_fill_properties(struct drm_connector_state *connector_state,
 				  struct gud_property_req *properties);
 int gud_get_connectors(struct gud_device *gdrm);

drivers/gpu/drm/gud/gud_pipe.c

@@ -20,7 +20,6 @@
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_print.h>
 #include <drm/drm_rect.h>
-#include <drm/drm_simple_kms_helper.h>
 #include <drm/gud.h>
 
 #include "gud_internal.h"
@@ -451,14 +450,15 @@ static void gud_fb_handle_damage(struct gud_device *gdrm, struct drm_framebuffer
 	gud_flush_damage(gdrm, fb, src, !fb->obj[0]->import_attach, damage);
 }
 
-int gud_pipe_check(struct drm_simple_display_pipe *pipe,
-		   struct drm_plane_state *new_plane_state,
-		   struct drm_crtc_state *new_crtc_state)
+int gud_plane_atomic_check(struct drm_plane *plane,
+			   struct drm_atomic_state *state)
 {
-	struct gud_device *gdrm = to_gud_device(pipe->crtc.dev);
-	struct drm_plane_state *old_plane_state = pipe->plane.state;
-	const struct drm_display_mode *mode = &new_crtc_state->mode;
-	struct drm_atomic_state *state = new_plane_state->state;
+	struct gud_device *gdrm = to_gud_device(plane->dev);
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *crtc = new_plane_state->crtc;
+	struct drm_crtc_state *crtc_state;
+	const struct drm_display_mode *mode;
 	struct drm_framebuffer *old_fb = old_plane_state->fb;
 	struct drm_connector_state *connector_state = NULL;
 	struct drm_framebuffer *fb = new_plane_state->fb;
@@ -469,20 +469,37 @@ int gud_pipe_check(struct drm_simple_display_pipe *pipe,
 	int idx, ret;
 	size_t len;
 
-	if (WARN_ON_ONCE(!fb))
+	if (drm_WARN_ON_ONCE(plane->dev, !fb))
 		return -EINVAL;
 
+	if (drm_WARN_ON_ONCE(plane->dev, !crtc))
+		return -EINVAL;
+
+	crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+
+	mode = &crtc_state->mode;
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+
+	if (!new_plane_state->visible)
+		return 0;
+
 	if (old_plane_state->rotation != new_plane_state->rotation)
-		new_crtc_state->mode_changed = true;
+		crtc_state->mode_changed = true;
 
 	if (old_fb && old_fb->format != format)
-		new_crtc_state->mode_changed = true;
+		crtc_state->mode_changed = true;
 
-	if (!new_crtc_state->mode_changed && !new_crtc_state->connectors_changed)
+	if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
 		return 0;
 
 	/* Only one connector is supported */
-	if (hweight32(new_crtc_state->connector_mask) != 1)
+	if (hweight32(crtc_state->connector_mask) != 1)
 		return -EINVAL;
 
 	if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format)
@@ -500,7 +517,7 @@ int gud_pipe_check(struct drm_simple_display_pipe *pipe,
 	if (!connector_state) {
 		struct drm_connector_list_iter conn_iter;
 
-		drm_connector_list_iter_begin(pipe->crtc.dev, &conn_iter);
+		drm_connector_list_iter_begin(plane->dev, &conn_iter);
 		drm_for_each_connector_iter(connector, &conn_iter) {
 			if (connector->state->crtc) {
 				connector_state = connector->state;
@@ -567,16 +584,18 @@ out:
 	return ret;
 }
 
-void gud_pipe_update(struct drm_simple_display_pipe *pipe,
-		     struct drm_plane_state *old_state)
+void gud_plane_atomic_update(struct drm_plane *plane,
+			     struct drm_atomic_state *atomic_state)
 {
-	struct drm_device *drm = pipe->crtc.dev;
+	struct drm_device *drm = plane->dev;
 	struct gud_device *gdrm = to_gud_device(drm);
-	struct drm_plane_state *state = pipe->plane.state;
-	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
-	struct drm_framebuffer *fb = state->fb;
-	struct drm_crtc *crtc = &pipe->crtc;
+	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(atomic_state, plane);
+	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(atomic_state, plane);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(new_state);
+	struct drm_framebuffer *fb = new_state->fb;
+	struct drm_crtc *crtc = new_state->crtc;
 	struct drm_rect damage;
+	struct drm_atomic_helper_damage_iter iter;
 	int ret, idx;
 
 	if (crtc->state->mode_changed || !crtc->state->enable) {
@@ -611,7 +630,8 @@ void gud_pipe_update(struct drm_simple_display_pipe *pipe,
 	if (ret)
 		goto ctrl_disable;
 
-	if (drm_atomic_helper_damage_merged(old_state, state, &damage))
+	drm_atomic_helper_damage_iter_init(&iter, old_state, new_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage)
 		gud_fb_handle_damage(gdrm, fb, &shadow_plane_state->data[0], &damage);
 
 	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);