linux-kernel - Re: [PATCH v2 5/8] drm/msm/dpu: use drmm_writeback_connector

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Message-ID: <41dacae0-0c66-493a-b5d8-a6df5f7e3b9e@oss.qualcomm.com>
Date: Mon, 18 Aug 2025 11:35:19 -0700
From: Jessica Zhang <jessica.zhang@....qualcomm.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>, 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,
        Louis Chauvet <louis.chauvet@...tlin.com>
Subject: Re: [PATCH v2 5/8] drm/msm/dpu: use drmm_writeback_connector_init()



On 8/16/2025 8:19 AM, Dmitry Baryshkov wrote:
> Use drmm_plain_encoder_alloc() to allocate simple encoder and
> drmm_writeback_connector_init() in order to initialize writeback
> connector instance.
> 
> Reviewed-by: Suraj Kandpal <suraj.kandpal@...el.com>
> Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

Hey Dmitry,

Just a heads up, I think the commit message prefix here is incorrect.

Thanks,

Jessica Zhang

> ---
>   .../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..64cea20d00b38861e22fc53375ab41ae988ceb59 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 = drm_crtc_mask(&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,
>