linux-kernel - Re: [PATCH v2 05/20] drm/dp: Add backpointer to drm_device in drm_dp

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Date:   Thu, 01 Apr 2021 16:31:05 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Lyude Paul <lyude@...hat.com>, nouveau@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König 
        <christian.koenig@....com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Ben Skeggs <bskeggs@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        Luben Tuikov <luben.tuikov@....com>,
        Oleg Vasilev <oleg.vasilev@...el.com>,
        Mikita Lipski <mikita.lipski@....com>,
        Eryk Brol <eryk.brol@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        "Jerry \(Fangzhi\) Zuo" <Jerry.Zuo@....com>,
        Chris Park <Chris.Park@....com>,
        Sam Ravnborg <sam@...nborg.org>, Joe Perches <joe@...ches.com>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Guido Günther <agx@...xcpu.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Andy Yan <andy.yan@...k-chips.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        Yuti Amonkar <yamonkar@...ence.com>,
        Jyri Sarha <jsarha@...com>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Imre Deak <imre.deak@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list\:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list\:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        "open list\:DRM DRIVERS FOR NVIDIA TEGRA" 
        <linux-tegra@...r.kernel.org>,
        "moderated list\:ARM\/ZYNQ ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 05/20] drm/dp: Add backpointer to drm_device in drm_dp_aux

On Fri, 26 Mar 2021, Lyude Paul <lyude@...hat.com> wrote:
>   * The @dev field should be set to a pointer to the device that implements the
> - * AUX channel.
> + * AUX channel. As well, the @drm_dev field should be set to the &drm_device
> + * that will be using this AUX channel as early as possible. For many graphics
> + * drivers this should happen before drm_dp_aux_init(), however it's perfectly
> + * fine to set this field later so long as it's assigned before calling
> + * drm_dp_aux_register().

Perhaps add a follow-up patch to actually ensure this is the case in
drm_dp_aux_register()?

>   *
>   * The @name field may be used to specify the name of the I2C adapter. If set to
>   * %NULL, dev_name() of @dev will be used.
> @@ -1877,6 +1883,7 @@ struct drm_dp_aux {
>  	const char *name;
>  	struct i2c_adapter ddc;
>  	struct device *dev;
> +	struct drm_device *drm_dev;

Bikeshed, I would probably have called it just drm for brevity, but no
strong feelings.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center