From 8bc1946ab3723cbef79341af98eaf8002aba71ed Mon Sep 17 00:00:00 2001
From: Ze Huang <ze.huang@oss.qualcomm.com>
Date: Mon, 27 Jul 2026 03:45:16 +0800
Subject: [PATCH] drm/mcde: replace struct drm_simple_display_pipe with regular
 atomic helpers

Convert MCDE to explicit plane, CRTC and encoder objects.

Handle pending page-flip events from the CRTC atomic flush path using the
commit-local CRTC state, and avoid manual connector/encoder attachment
before the connector has been created by the bridge path.

Signed-off-by: Ze Huang <ze.huang@oss.qualcomm.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260727-drm-simple-kms-removal-v3-3-cd5dc89858c6@oss.qualcomm.com
---
 drivers/gpu/drm/mcde/mcde_display.c | 272 ++++++++++++++++++----------
 drivers/gpu/drm/mcde/mcde_drm.h     |  12 +-
 drivers/gpu/drm/mcde/mcde_drv.c     |   3 +-
 3 files changed, 184 insertions(+), 103 deletions(-)

diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
index 257a6e84dd58..50c90cf84a9a 100644
--- a/drivers/gpu/drm/mcde/mcde_display.c
+++ b/drivers/gpu/drm/mcde/mcde_display.c
@@ -10,6 +10,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/media-bus-format.h>
 
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_device.h>
 #include <drm/drm_fb_dma_helper.h>
 #include <drm/drm_fourcc.h>
@@ -18,7 +19,6 @@
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_print.h>
-#include <drm/drm_simple_kms_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_vblank.h>
 #include <video/mipi_display.h>
@@ -132,7 +132,7 @@ void mcde_display_irq(struct mcde *mcde)
 	writel(mispp, mcde->regs + MCDE_RISPP);
 
 	if (vblank)
-		drm_crtc_handle_vblank(&mcde->pipe.crtc);
+		drm_crtc_handle_vblank(&mcde->crtc);
 
 	if (misovl)
 		dev_info(mcde->dev, "some stray overlay IRQ %08x\n", misovl);
@@ -157,40 +157,59 @@ void mcde_display_disable_irqs(struct mcde *mcde)
 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISCHNL);
 }
 
-static int mcde_display_check(struct drm_simple_display_pipe *pipe,
-			      struct drm_plane_state *pstate,
-			      struct drm_crtc_state *cstate)
+static int mcde_plane_helper_atomic_check(struct drm_plane *plane,
+					  struct drm_atomic_commit *commit)
 {
-	const struct drm_display_mode *mode = &cstate->mode;
-	struct drm_framebuffer *old_fb = pipe->plane.state->fb;
+	struct drm_plane_state *pstate = drm_atomic_get_new_plane_state(commit, plane);
+	struct drm_plane_state *old_pstate = drm_atomic_get_old_plane_state(commit, plane);
+	struct drm_crtc_state *cstate = NULL;
+	const struct drm_display_mode *mode;
+	struct drm_framebuffer *old_fb = old_pstate->fb;
 	struct drm_framebuffer *fb = pstate->fb;
+	int ret;
 
-	if (fb) {
-		u32 offset = drm_fb_dma_get_gem_addr(fb, pstate, 0);
-
-		/* FB base address must be dword aligned. */
-		if (offset & 3) {
-			DRM_DEBUG_KMS("FB not 32-bit aligned\n");
-			return -EINVAL;
-		}
-
-		/*
-		 * There's no pitch register, the mode's hdisplay
-		 * controls this.
-		 */
-		if (fb->pitches[0] != mode->hdisplay * fb->format->cpp[0]) {
-			DRM_DEBUG_KMS("can't handle pitches\n");
-			return -EINVAL;
-		}
-
-		/*
-		 * We can't change the FB format in a flicker-free
-		 * manner (and only update it during CRTC enable).
-		 */
-		if (old_fb && old_fb->format != fb->format)
-			cstate->mode_changed = true;
+	if (pstate->crtc) {
+		cstate = drm_atomic_get_crtc_state(commit, pstate->crtc);
+		if (IS_ERR(cstate))
+			return PTR_ERR(cstate);
 	}
 
+	ret = drm_atomic_helper_check_plane_state(pstate, cstate,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+
+	if (!pstate->visible || !fb)
+		return 0;
+
+	mode = &cstate->mode;
+
+	u32 offset = drm_fb_dma_get_gem_addr(fb, pstate, 0);
+
+	/* FB base address must be dword aligned. */
+	if (offset & 3) {
+		DRM_DEBUG_KMS("FB not 32-bit aligned\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * There's no pitch register, the mode's hdisplay
+	 * controls this.
+	 */
+	if (fb->pitches[0] != mode->hdisplay * fb->format->cpp[0]) {
+		DRM_DEBUG_KMS("can't handle pitches\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * We can't change the FB format in a flicker-free
+	 * manner (and only update it during CRTC enable).
+	 */
+	if (old_fb && old_fb->format != fb->format)
+		cstate->mode_changed = true;
+
 	return 0;
 }
 
@@ -1149,16 +1168,15 @@ static void mcde_setup_dsi(struct mcde *mcde, const struct drm_display_mode *mod
 	*dsi_formatter_frame = formatter_frame;
 }
 
-static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
-				struct drm_crtc_state *cstate,
-				struct drm_plane_state *plane_state)
+static void mcde_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					   struct drm_atomic_commit *commit)
 {
-	struct drm_crtc *crtc = &pipe->crtc;
-	struct drm_plane *plane = &pipe->plane;
 	struct drm_device *drm = crtc->dev;
 	struct mcde *mcde = to_mcde(drm);
+	struct drm_crtc_state *cstate = drm_atomic_get_new_crtc_state(commit, crtc);
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(commit, &mcde->plane);
 	const struct drm_display_mode *mode = &cstate->mode;
-	struct drm_framebuffer *fb = plane->state->fb;
+	struct drm_framebuffer *fb = plane_state->fb;
 	u32 format = fb->format->format;
 	int dsi_pkt_size;
 	int fifo_wtrmrk;
@@ -1298,9 +1316,10 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
 	dev_info(drm->dev, "MCDE display is enabled\n");
 }
 
-static void mcde_display_disable(struct drm_simple_display_pipe *pipe)
+static void mcde_crtc_helper_atomic_disable(struct drm_crtc *crtc,
+					    struct drm_atomic_commit *commit)
 {
-	struct drm_crtc *crtc = &pipe->crtc;
+	struct drm_crtc_state *cstate = drm_atomic_get_new_crtc_state(commit, crtc);
 	struct drm_device *drm = crtc->dev;
 	struct mcde *mcde = to_mcde(drm);
 	struct drm_pending_vblank_event *event;
@@ -1318,9 +1337,9 @@ static void mcde_display_disable(struct drm_simple_display_pipe *pipe)
 		mcde_dsi_disable(mcde->bridge);
 	}
 
-	event = crtc->state->event;
+	event = cstate->event;
 	if (event) {
-		crtc->state->event = NULL;
+		cstate->event = NULL;
 
 		spin_lock_irq(&crtc->dev->event_lock);
 		drm_crtc_send_vblank_event(crtc, event);
@@ -1381,44 +1400,13 @@ static void mcde_set_extsrc(struct mcde *mcde, u32 buffer_address)
 	writel(buffer_address + mcde->stride, mcde->regs + MCDE_EXTSRCXA1);
 }
 
-static void mcde_display_update(struct drm_simple_display_pipe *pipe,
-				struct drm_plane_state *old_pstate)
+static void mcde_plane_helper_atomic_update(struct drm_plane *plane,
+					    struct drm_atomic_commit *commit)
 {
-	struct drm_crtc *crtc = &pipe->crtc;
-	struct drm_device *drm = crtc->dev;
-	struct mcde *mcde = to_mcde(drm);
-	struct drm_pending_vblank_event *event = crtc->state->event;
-	struct drm_plane *plane = &pipe->plane;
-	struct drm_plane_state *pstate = plane->state;
+	struct drm_plane_state *pstate = drm_atomic_get_new_plane_state(commit, plane);
+	struct mcde *mcde = to_mcde(plane->dev);
 	struct drm_framebuffer *fb = pstate->fb;
 
-	/*
-	 * Handle any pending event first, we need to arm the vblank
-	 * interrupt before sending any update to the display so we don't
-	 * miss the interrupt.
-	 */
-	if (event) {
-		crtc->state->event = NULL;
-
-		spin_lock_irq(&crtc->dev->event_lock);
-		/*
-		 * Hardware must be on before we can arm any vblank event,
-		 * this is not a scanout controller where there is always
-		 * some periodic update going on, it is completely frozen
-		 * until we get an update. If MCDE output isn't yet enabled,
-		 * we just send a vblank dummy event back.
-		 */
-		if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0) {
-			dev_dbg(mcde->dev, "arm vblank event\n");
-			drm_crtc_arm_vblank_event(crtc, event);
-		} else {
-			dev_dbg(mcde->dev, "insert fake vblank event\n");
-			drm_crtc_send_vblank_event(crtc, event);
-		}
-
-		spin_unlock_irq(&crtc->dev->event_lock);
-	}
-
 	/*
 	 * We do not start sending framebuffer updates before the
 	 * display is enabled. Update events will however be dispatched
@@ -1427,12 +1415,6 @@ static void mcde_display_update(struct drm_simple_display_pipe *pipe,
 	if (fb) {
 		mcde_set_extsrc(mcde, drm_fb_dma_get_gem_addr(fb, pstate, 0));
 		dev_info_once(mcde->dev, "first update of display contents\n");
-		/*
-		 * Usually the flow is already active, unless we are in
-		 * oneshot mode, then we need to kick the flow right here.
-		 */
-		if (mcde->flow_active == 0)
-			mcde_start_flow(mcde);
 	} else {
 		/*
 		 * If an update is receieved before the MCDE is enabled
@@ -1443,9 +1425,47 @@ static void mcde_display_update(struct drm_simple_display_pipe *pipe,
 	}
 }
 
-static int mcde_display_enable_vblank(struct drm_simple_display_pipe *pipe)
+static void mcde_crtc_helper_atomic_flush(struct drm_crtc *crtc,
+					  struct drm_atomic_commit *commit)
+{
+	struct mcde *mcde = to_mcde(crtc->dev);
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(commit, &mcde->plane);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(commit, crtc);
+	struct drm_pending_vblank_event *event = crtc_state->event;
+
+	/*
+	 * Handle any pending event first, we need to arm the vblank
+	 * interrupt before sending any update to the display so we don't
+	 * miss the interrupt.
+	 */
+	if (event) {
+		crtc_state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		/*
+		 * Hardware must be on before we can arm any vblank event,
+		 * this is not a scanout controller where there is always
+		 * some periodic update going on, it is completely frozen
+		 * until we get an update. If MCDE output isn't yet enabled,
+		 * we just send a vblank dummy event back.
+		 */
+		if (crtc_state->active && drm_crtc_vblank_get(crtc) == 0) {
+			dev_dbg(mcde->dev, "arm vblank event\n");
+			drm_crtc_arm_vblank_event(crtc, event);
+		} else {
+			dev_dbg(mcde->dev, "insert fake vblank event\n");
+			drm_crtc_send_vblank_event(crtc, event);
+		}
+
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+
+	if (crtc_state->active && plane_state && plane_state->fb && mcde->flow_active == 0)
+		mcde_start_flow(mcde);
+}
+
+static int mcde_crtc_enable_vblank(struct drm_crtc *crtc)
 {
-	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
 	struct mcde *mcde = to_mcde(drm);
 	u32 val;
@@ -1462,9 +1482,8 @@ static int mcde_display_enable_vblank(struct drm_simple_display_pipe *pipe)
 	return 0;
 }
 
-static void mcde_display_disable_vblank(struct drm_simple_display_pipe *pipe)
+static void mcde_crtc_disable_vblank(struct drm_crtc *crtc)
 {
-	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
 	struct mcde *mcde = to_mcde(drm);
 
@@ -1474,13 +1493,55 @@ static void mcde_display_disable_vblank(struct drm_simple_display_pipe *pipe)
 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISPP);
 }
 
-static struct drm_simple_display_pipe_funcs mcde_display_funcs = {
-	.check = mcde_display_check,
-	.enable = mcde_display_enable,
-	.disable = mcde_display_disable,
-	.update = mcde_display_update,
-	.enable_vblank = mcde_display_enable_vblank,
-	.disable_vblank = mcde_display_disable_vblank,
+static int mcde_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_commit *commit)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(commit, crtc);
+	int ret;
+
+	if (crtc_state->enable) {
+		ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+		if (ret)
+			return ret;
+	}
+
+	return drm_atomic_add_affected_planes(commit, crtc);
+}
+
+static const struct drm_crtc_funcs mcde_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,
+	.enable_vblank		= mcde_crtc_enable_vblank,
+	.disable_vblank		= mcde_crtc_disable_vblank,
+};
+
+static const struct drm_crtc_helper_funcs mcde_crtc_helper_funcs = {
+	.atomic_check	= mcde_crtc_helper_atomic_check,
+	.atomic_enable	= mcde_crtc_helper_atomic_enable,
+	.atomic_disable	= mcde_crtc_helper_atomic_disable,
+	.atomic_flush	= mcde_crtc_helper_atomic_flush,
+};
+
+static const struct drm_plane_funcs mcde_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.reset			= drm_atomic_helper_plane_reset,
+	.destroy		= drm_plane_cleanup,
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs mcde_plane_helper_funcs = {
+	.prepare_fb	= drm_gem_plane_helper_prepare_fb,
+	.atomic_check	= mcde_plane_helper_atomic_check,
+	.atomic_update	= mcde_plane_helper_atomic_update,
+};
+
+static const struct drm_encoder_funcs mcde_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
 };
 
 int mcde_display_init(struct drm_device *drm)
@@ -1510,14 +1571,29 @@ int mcde_display_init(struct drm_device *drm)
 	if (ret)
 		return ret;
 
-	ret = drm_simple_display_pipe_init(drm, &mcde->pipe,
-					   &mcde_display_funcs,
-					   formats, ARRAY_SIZE(formats),
-					   NULL,
-					   mcde->connector);
+	ret = drm_universal_plane_init(drm, &mcde->plane, 0,
+				       &mcde_plane_funcs,
+				       formats, ARRAY_SIZE(formats),
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
 	if (ret)
 		return ret;
 
+	drm_plane_helper_add(&mcde->plane, &mcde_plane_helper_funcs);
+
+	ret = drm_crtc_init_with_planes(drm, &mcde->crtc, &mcde->plane,
+					NULL, &mcde_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+
+	drm_crtc_helper_add(&mcde->crtc, &mcde_crtc_helper_funcs);
+
+	ret = drm_encoder_init(drm, &mcde->encoder, &mcde_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret)
+		return ret;
+
+	mcde->encoder.possible_crtcs = drm_crtc_mask(&mcde->crtc);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mcde_display_init);
diff --git a/drivers/gpu/drm/mcde/mcde_drm.h b/drivers/gpu/drm/mcde/mcde_drm.h
index ecb70b4b737c..edbb4580a7d8 100644
--- a/drivers/gpu/drm/mcde/mcde_drm.h
+++ b/drivers/gpu/drm/mcde/mcde_drm.h
@@ -4,7 +4,7 @@
  * Parts of this file were based on the MCDE driver by Marcus Lorentzon
  * (C) ST-Ericsson SA 2013
  */
-#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_encoder.h>
 
 #ifndef _MCDE_DRM_H_
 #define _MCDE_DRM_H_
@@ -72,7 +72,9 @@ struct mcde {
 	struct drm_panel *panel;
 	struct drm_bridge *bridge;
 	struct drm_connector *connector;
-	struct drm_simple_display_pipe pipe;
+	struct drm_plane plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
 	struct mipi_dsi_device *mdsi;
 	bool dpi_output;
 	s16 stride;
@@ -95,7 +97,11 @@ struct mcde {
 	struct regulator *vana;
 };
 
-#define to_mcde(dev) container_of(dev, struct mcde, drm)
+static inline struct mcde *to_mcde(struct drm_device *dev)
+{
+	return container_of(dev, struct mcde, drm);
+}
+
 
 static inline bool mcde_flow_is_video(struct mcde *mcde)
 {
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index 53275b575f0c..759e279b645a 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -187,8 +187,7 @@ static int mcde_modeset_init(struct drm_device *drm)
 	}
 
 	/* Attach the bridge. */
-	ret = drm_simple_display_pipe_attach_bridge(&mcde->pipe,
-						    mcde->bridge);
+	ret = drm_bridge_attach(&mcde->encoder, mcde->bridge, NULL, 0);
 	if (ret) {
 		dev_err(drm->dev, "failed to attach display output bridge\n");
 		return ret;