From 8206ab8f22ca9772e899e34b7edbfbb91fda73e0 Mon Sep 17 00:00:00 2001
From: Qubot <1445788683@qq.com>
Date: Fri, 5 Jun 2026 11:25:12 +0800
Subject: [PATCH] sun60iw2: keep HDMI active during kernel handoff

---
 board/sunxi/board_common.c         |  2 +-
 drivers/video/drm/sunxi_drm_crtc.c | 25 ++++++++++++++-
 drivers/video/drm/sunxi_drm_drv.c  | 51 ++++++++++++++++++++++++++++++
 include/drm/drm_logo.h             |  1 +
 4 files changed, 77 insertions(+), 2 deletions(-)

diff --git a/board/sunxi/board_common.c b/board/sunxi/board_common.c
index 98716090..1ff25d43 100644
--- a/board/sunxi/board_common.c
+++ b/board/sunxi/board_common.c
@@ -900,7 +900,7 @@ void reset_misc(void)
 void board_quiesce_devices(void)
 {
 #ifdef CONFIG_SUNXI_DRM_SUPPORT
-	sunxi_drm_disable();
+	sunxi_drm_handoff_to_kernel();
 #endif
 	sunxi_flash_flush();
 	/*modify 2 for nor to finally exit*/
diff --git a/drivers/video/drm/sunxi_drm_crtc.c b/drivers/video/drm/sunxi_drm_crtc.c
index 10f82039..2485cb11 100644
--- a/drivers/video/drm/sunxi_drm_crtc.c
+++ b/drivers/video/drm/sunxi_drm_crtc.c
@@ -38,6 +38,7 @@
 
 #define to_sunxi_plane(x)			container_of(x, struct sunxi_drm_plane, plane)
 
+static void sunxi_plane_atomic_update(struct drm_plane *plane);
 
 int sunxi_drm_crtc_get_hw_id(struct sunxi_drm_crtc *scrtc)
 {
@@ -51,6 +52,19 @@ int sunxi_drm_crtc_get_hw_id(struct sunxi_drm_crtc *scrtc)
 int sunxi_plane_disable_plane(struct drm_plane *plane)
 {
 	struct drm_plane_state *plane_state = plane->state;
+	struct sunxi_drm_plane *sunxi_plane = to_sunxi_plane(plane);
+	struct sunxi_drm_crtc *crtc = sunxi_plane->crtc;
+	struct display_channel_state *old_ch_state;
+	struct display_channel_state *ch_state;
+	struct display_state *state;
+
+	if (!plane_state) {
+		plane->funcs->reset(plane);
+		plane_state = plane->state;
+		if (!plane_state)
+			return -ENOMEM;
+	}
+
 	plane_state->fb = NULL;
 	plane_state->crtc_x = 0;
 	plane_state->crtc_y = 0;
@@ -60,7 +74,16 @@ int sunxi_plane_disable_plane(struct drm_plane *plane)
 	plane_state->src_y = 0;
 	plane_state->src_w = 0;
 	plane_state->src_h = 0;
-	//tigger commit
+
+	sunxi_plane_atomic_update(plane);
+	state = display_state_get_by_crtc(crtc);
+	if (state && crtc->funcs->flush)
+		crtc->funcs->flush(state);
+
+	ch_state = to_display_channel_state(plane_state);
+	old_ch_state = to_display_channel_state(plane->old_state);
+	memcpy(old_ch_state, ch_state, sizeof(struct display_channel_state));
+
 	return 0;
 }
 
diff --git a/drivers/video/drm/sunxi_drm_drv.c b/drivers/video/drm/sunxi_drm_drv.c
index 39eec536..075c1d32 100644
--- a/drivers/video/drm/sunxi_drm_drv.c
+++ b/drivers/video/drm/sunxi_drm_drv.c
@@ -1047,6 +1047,37 @@ static int display_set_plane(struct display_state *state)
 
 }
 
+static int display_clear_plane_for_handoff(struct display_state *state)
+{
+	struct crtc_state *crtc_state = &state->crtc_state;
+	struct drm_mode_set_plane plane_req;
+	int ret;
+
+	if (!state->is_init || !state->is_enable)
+		return 0;
+
+	memset(&plane_req, 0, sizeof(plane_req));
+
+	plane_req.crtc_id = crtc_state->crtc_id;
+	plane_req.fb_id = -1;
+	plane_req.plane_id = drm_get_primary_plane_id(state->drm,
+						      plane_req.crtc_id);
+	if (plane_req.plane_id < 0) {
+		DRM_ERROR("Failed to get primary plane for crtc %d\n",
+			  plane_req.crtc_id);
+		return -ENODEV;
+	}
+
+	ret = drm_mode_setplane(state->drm, &plane_req);
+	if (ret) {
+		DRM_ERROR("Failed to clear plane %d on crtc %d: %d\n",
+			  plane_req.plane_id, plane_req.crtc_id, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int display_enable(struct display_state *state)
 {
 	struct crtc_state *crtc_state = &state->crtc_state;
@@ -1511,6 +1542,26 @@ int sunxi_drm_disable(void)
 	return 0;
 }
 
+int sunxi_drm_handoff_to_kernel(void)
+{
+	struct display_state *state;
+	struct sunxi_drm_device *drm = sunxi_drm_device_get();
+	int ret = 0;
+
+	if (!drm || list_empty(&drm->display_list))
+		return -1;
+
+	sunxi_drm_for_each_display(state, drm) {
+		if (state->is_enable) {
+			ret = display_clear_plane_for_handoff(state);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
 int sunxi_show_bmp(char *bmp)
 {
 	struct display_state *s;
diff --git a/include/drm/drm_logo.h b/include/drm/drm_logo.h
index 53e6824f..c2dde920 100644
--- a/include/drm/drm_logo.h
+++ b/include/drm/drm_logo.h
@@ -26,6 +26,7 @@ int sunxi_show_bmp(char *name);
 int sunxi_show_bmp_and_backlight(char *name, char *reg);
 int sunxi_backlight_ctrl(char *reg);
 int sunxi_drm_disable(void);
+int sunxi_drm_handoff_to_kernel(void);
 #ifdef __cplusplus
 }
 #endif