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From: Linus Walleij <linus.walleij@linaro.org>
To: Douglas Anderson <dianders@chromium.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Sam Ravnborg <sam@ravnborg.org>,
	Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>,
	Lyude Paul <lyude@redhat.com>,
	Thierry Reding <treding@nvidia.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	MSM <linux-arm-msm@vger.kernel.org>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
	Rob Clark <robdclark@chromium.org>,
	Steev Klimaszewski <steev@kali.org>,
	Rajeev Nandan <rajeevny@codeaurora.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v7 04/10] drm: Introduce the DP AUX bus
Date: Sat, 22 May 2021 12:34:28 +0200	[thread overview]
Message-ID: <CACRpkda_MTBrXR-as5t_Ji8mU4=95NQ_GTDtjcERncm9yS1moA@mail.gmail.com> (raw)
In-Reply-To: <20210517130450.v7.4.I787c9ba09ed5ce12500326ded73a4f7c9265b1b3@changeid>

On Mon, May 17, 2021 at 10:09 PM Douglas Anderson <dianders@chromium.org> wrote:

> Historically "simple" eDP panels have been handled by panel-simple
> which is a basic platform_device. In the device tree, the panel node
> was at the top level and not connected to anything else.
>
> Let's change it so that, instead, panels can be represented as being
> children of the "DP AUX bus". Essentially we're saying that the
> hierarchy that we're going to represent is the "control" connections
> between devices. The DP AUX bus is a control bus provided by an eDP
> controller (the parent) and consumed by a device like a panel (the
> child).
>
> The primary incentive here is to cleanly provide the panel driver the
> ability to communicate over the AUX bus while handling lifetime issues
> properly. The panel driver may want the AUX bus for controlling the
> backlight or querying the panel's EDID.
>
> The idea for this bus's design was hashed out over IRC [1].
>
> [1] https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&date=2021-05-11
>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Lyude Paul <lyude@redhat.com>
> Cc: Rajeev Nandan <rajeevny@codeaurora.org>
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>

I like the concept and the general idea behind this, clean and
helpful design.
Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

  reply	other threads:[~2021-05-22 10:34 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 20:08 [PATCH v7 00/10] drm: Fix EDID reading on ti-sn65dsi86 by introducing " Douglas Anderson
2021-05-17 20:08 ` [PATCH v7 01/10] drm/panel: panel-simple: Add missing pm_runtime_dont_use_autosuspend() calls Douglas Anderson
2021-05-24 20:22   ` Laurent Pinchart
2021-05-24 21:08     ` Doug Anderson
2021-05-17 20:08 ` [PATCH v7 02/10] dt-bindings: display: simple: List hpd properties in panel-simple Douglas Anderson
2021-05-18 12:41   ` Rob Herring
2021-05-18 13:58     ` Doug Anderson
2021-05-22 10:38       ` Linus Walleij
2021-05-17 20:09 ` [PATCH v7 03/10] dt-bindings: drm/bridge: ti-sn65dsi86: Add aux-bus child Douglas Anderson
2021-05-19 20:01   ` Rob Herring
2021-05-19 21:06     ` Doug Anderson
2021-05-20 13:25       ` Rob Herring
2021-05-17 20:09 ` [PATCH v7 04/10] drm: Introduce the DP AUX bus Douglas Anderson
2021-05-22 10:34   ` Linus Walleij [this message]
2021-05-17 20:09 ` [PATCH v7 05/10] drm/panel: panel-simple: Allow panel-simple be a DP AUX endpoint device Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 06/10] drm/panel: panel-simple: Stash DP AUX bus; allow using it for DDC Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 07/10] drm/bridge: ti-sn65dsi86: Promote the AUX channel to its own sub-dev Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 08/10] drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus Douglas Anderson
2021-05-22 10:35   ` Linus Walleij
2021-05-24 20:29   ` Lyude Paul
2021-05-17 20:09 ` [PATCH v7 09/10] drm/bridge: ti-sn65dsi86: Don't read EDID blob over DDC Douglas Anderson
2021-05-17 20:09 ` [PATCH v7 10/10] arm64: dts: qcom: sc7180-trogdor: Move panel under the bridge chip Douglas Anderson
2021-05-22 10:40   ` Linus Walleij
2021-05-19 21:41 ` [PATCH v7 00/10] drm: Fix EDID reading on ti-sn65dsi86 by introducing the DP AUX bus Lyude Paul
2021-05-21 23:07 ` Lyude Paul
2021-05-24 15:14   ` Doug Anderson

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