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

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Message-ID: <bfb8a882-1179-4ba8-98eb-5da12b2edfc2@bootlin.com>
Date: Fri, 1 Aug 2025 16:08:06 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 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: Re: [PATCH 1/8] drm/amd/display: use drmm_writeback_connector_init()



Le 01/08/2025 à 15:51, Dmitry Baryshkov a écrit :
> 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>

Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.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;
> 

-- 
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com