Merge tag 'mediatek-drm-fixes-20250829' of https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux into drm-fixes

Mediatek DRM Fixes - 20250829

1. Add error handling for old state CRTC in atomic_disable
2. Fix DSI host and panel bridge pre-enable order
3. Fix device/node reference count leaks in mtk_drm_get_all_drm_priv
4. mtk_hdmi: Fix inverted parameters in some regmap_update_bits calls

Signed-off-by: Dave Airlie <[email protected]>

From: Chun-Kuang Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: airlied

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -387,19 +387,19 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
 
 		of_id = of_match_node(mtk_drm_of_ids, node);
 		if (!of_id)
-			continue;
+			goto next_put_node;
 
 		pdev = of_find_device_by_node(node);
 		if (!pdev)
-			continue;
+			goto next_put_node;
 
 		drm_dev = device_find_child(&pdev->dev, NULL, mtk_drm_match);
 		if (!drm_dev)
-			continue;
+			goto next_put_device_pdev_dev;
 
 		temp_drm_priv = dev_get_drvdata(drm_dev);
 		if (!temp_drm_priv)
-			continue;
+			goto next_put_device_drm_dev;
 
 		if (temp_drm_priv->data->main_len)
 			all_drm_priv[CRTC_MAIN] = temp_drm_priv;
@@ -411,10 +411,17 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
 		if (temp_drm_priv->mtk_drm_bound)
 			cnt++;
 
-		if (cnt == MAX_CRTC) {
-			of_node_put(node);
+next_put_device_drm_dev:
+		put_device(drm_dev);
+
+next_put_device_pdev_dev:
+		put_device(&pdev->dev);
+
+next_put_node:
+		of_node_put(node);
+
+		if (cnt == MAX_CRTC)
 			break;
-		}
 	}
 
 	if (drm_priv->data->mmsys_dev_num == cnt) {

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -1002,6 +1002,12 @@ static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
 			return PTR_ERR(dsi->next_bridge);
 	}
 
+	/*
+	 * set flag to request the DSI host bridge be pre-enabled before device bridge
+	 * in the chain, so the DSI host is ready when the device bridge is pre-enabled
+	 */
+	dsi->next_bridge->pre_enable_prev_first = true;
+
 	drm_bridge_add(&dsi->bridge);
 
 	ret = component_add(host->dev, &mtk_dsi_component_ops);

drivers/gpu/drm/mediatek/mtk_hdmi.c

@@ -182,8 +182,8 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
 
 static void mtk_hdmi_hw_vid_black(struct mtk_hdmi *hdmi, bool black)
 {
-	regmap_update_bits(hdmi->regs, VIDEO_SOURCE_SEL,
-			   VIDEO_CFG_4, black ? GEN_RGB : NORMAL_PATH);
+	regmap_update_bits(hdmi->regs, VIDEO_CFG_4,
+			   VIDEO_SOURCE_SEL, black ? GEN_RGB : NORMAL_PATH);
 }
 
 static void mtk_hdmi_hw_make_reg_writable(struct mtk_hdmi *hdmi, bool enable)
@@ -310,8 +310,8 @@ static void mtk_hdmi_hw_send_info_frame(struct mtk_hdmi *hdmi, u8 *buffer,
 
 static void mtk_hdmi_hw_send_aud_packet(struct mtk_hdmi *hdmi, bool enable)
 {
-	regmap_update_bits(hdmi->regs, AUDIO_PACKET_OFF,
-			   GRL_SHIFT_R2, enable ? 0 : AUDIO_PACKET_OFF);
+	regmap_update_bits(hdmi->regs, GRL_SHIFT_R2,
+			   AUDIO_PACKET_OFF, enable ? 0 : AUDIO_PACKET_OFF);
 }
 
 static void mtk_hdmi_hw_config_sys(struct mtk_hdmi *hdmi)

drivers/gpu/drm/mediatek/mtk_plane.c

@@ -292,7 +292,8 @@ static void mtk_plane_atomic_disable(struct drm_plane *plane,
 	wmb(); /* Make sure the above parameter is set before update */
 	mtk_plane_state->pending.dirty = true;
 
-	mtk_crtc_plane_disable(old_state->crtc, plane);
+	if (old_state && old_state->crtc)
+		mtk_crtc_plane_disable(old_state->crtc, plane);
 }
 
 static void mtk_plane_atomic_update(struct drm_plane *plane,