linux-kernel - [PATCH 5/8] drm/msm/dpu: use drmm_writeback_connector

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Message-Id: <20250801-wb-drop-encoder-v1-5-824646042f7d@oss.qualcomm.com>
Date: Fri, 01 Aug 2025 16:51:13 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>,
        "Kandpal, Suraj" <suraj.kandpal@...el.com>,
        Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <siqueira@...lia.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Liviu Dudau <liviu.dudau@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maíra Canal <mcanal@...lia.com>,
        Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org
Subject: [PATCH 5/8] drm/msm/dpu: use drmm_writeback_connector_init()

Use drmm_plain_encoder_alloc() to allocate simple encoder and
drmm_writeback_connector_init() in order to initialize writeback
connector instance.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 .../gpu/drm/renesas/rcar-du/rcar_du_writeback.c    | 23 +++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
index 8cd37d7b8ae281cbc1fd8cbb243c621174517e23..9986a10e8114680e9da48986f4ca3ce6ec66b8cb 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
@@ -134,7 +134,6 @@ static void rcar_du_wb_conn_reset(struct drm_connector *connector)
 static const struct drm_connector_funcs rcar_du_wb_conn_funcs = {
 	.reset = rcar_du_wb_conn_reset,
 	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = drm_connector_cleanup,
 	.atomic_duplicate_state = rcar_du_wb_conn_duplicate_state,
 	.atomic_destroy_state = rcar_du_wb_conn_destroy_state,
 };
@@ -202,15 +201,25 @@ int rcar_du_writeback_init(struct rcar_du_device *rcdu,
 {
 	struct drm_writeback_connector *wb_conn = &rcrtc->writeback;
 
+	struct drm_encoder *encoder;
+
+	encoder = drmm_plain_encoder_alloc(&rcdu->ddev, NULL,
+					   DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (IS_ERR(encoder))
+		return PTR_ERR(encoder);
+
+	drm_encoder_helper_add(encoder, &rcar_du_wb_enc_helper_funcs);
+
+	encoder->possible_crtcs = 1 << drm_crtc_index(&rcrtc->crtc);
+
 	drm_connector_helper_add(&wb_conn->base,
 				 &rcar_du_wb_conn_helper_funcs);
 
-	return drm_writeback_connector_init(&rcdu->ddev, wb_conn,
-					    &rcar_du_wb_conn_funcs,
-					    &rcar_du_wb_enc_helper_funcs,
-					    writeback_formats,
-					    ARRAY_SIZE(writeback_formats),
-					    1 << drm_crtc_index(&rcrtc->crtc));
+	return drmm_writeback_connector_init(&rcdu->ddev, wb_conn,
+					     &rcar_du_wb_conn_funcs,
+					     encoder,
+					     writeback_formats,
+					     ARRAY_SIZE(writeback_formats));
 }
 
 void rcar_du_writeback_setup(struct rcar_du_crtc *rcrtc,

-- 
2.39.5