linux-kernel - [PATCH 1/8] drm/amd/display: use drmm_writeback_connector

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Message-Id: <20250801-wb-drop-encoder-v1-1-824646042f7d@oss.qualcomm.com>
Date: Fri, 01 Aug 2025 16:51:09 +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 1/8] drm/amd/display: 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>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c    |  2 +-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c | 18 +++++++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 096b23ad4845d365dad707deed4e3e84b1f9945d..a9948e8d67a6e9556d21090b5cdd101258d62480 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10003,7 +10003,7 @@ static void dm_set_writeback(struct amdgpu_display_manager *dm,
 		return;
 	}
 
-	acrtc = to_amdgpu_crtc(wb_conn->encoder.crtc);
+	acrtc = to_amdgpu_crtc(crtc_state->base.crtc);
 	if (!acrtc) {
 		drm_err(adev_to_drm(adev), "no amdgpu_crtc found\n");
 		kfree(wb_info);
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
index d9527c05fc878ef6916782ff9fde847813938461..80c37487ca77c0494eaf769c5b9a3c53486aa52d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
@@ -171,7 +171,6 @@ static const struct drm_encoder_helper_funcs amdgpu_dm_wb_encoder_helper_funcs =
 
 static const struct drm_connector_funcs amdgpu_dm_wb_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = drm_connector_cleanup,
 	.reset = amdgpu_dm_connector_funcs_reset,
 	.atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
@@ -190,17 +189,26 @@ int amdgpu_dm_wb_connector_init(struct amdgpu_display_manager *dm,
 	struct dc *dc = dm->dc;
 	struct dc_link *link = dc_get_link_at_index(dc, link_index);
 	int res = 0;
+	struct drm_encoder *encoder;
+
+	encoder = drmm_plain_encoder_alloc(&dm->adev->ddev, NULL,
+					   DRM_MODE_ENCODER_VIRTUAL, NULL);
+	if (IS_ERR(encoder))
+		return PTR_ERR(encoder);
+
+	drm_encoder_helper_add(encoder, &amdgpu_dm_wb_encoder_helper_funcs);
+
+	encoder->possible_crtcs = amdgpu_dm_get_encoder_crtc_mask(dm->adev);
 
 	wbcon->link = link;
 
 	drm_connector_helper_add(&wbcon->base.base, &amdgpu_dm_wb_conn_helper_funcs);
 
-	res = drm_writeback_connector_init(&dm->adev->ddev, &wbcon->base,
+	res = drmm_writeback_connector_init(&dm->adev->ddev, &wbcon->base,
 					    &amdgpu_dm_wb_connector_funcs,
-					    &amdgpu_dm_wb_encoder_helper_funcs,
+					    encoder,
 					    amdgpu_dm_wb_formats,
-					    ARRAY_SIZE(amdgpu_dm_wb_formats),
-					    amdgpu_dm_get_encoder_crtc_mask(dm->adev));
+					    ARRAY_SIZE(amdgpu_dm_wb_formats));
 
 	if (res)
 		return res;

-- 
2.39.5