linux-kernel - [PATCH v2 0/3] drm/panel-edp: Debugfs for panel-edp

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Date:   Fri,  4 Feb 2022 16:13:39 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        robert.foss@...aro.org, lschyi@...omium.org,
        Sam Ravnborg <sam@...nborg.org>, jjsu@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] drm/panel-edp: Debugfs for panel-edp

The main goal of this series is the final patch in the series: to
allow test code to reliably find out if we ended up hitting the
"fallback" case of the generic edp-panel driver where we don't
recognize a panel and choose to use super conservative timing.

Version 1 of the patch actually landed but was quickly reverted since
it was pointed out that it should have been done in debugfs, not
sysfs.

As discussed on IRC [1], we want this support to be under the
"connector" directory of debugfs but there was no existing way to do
that. Thus patch #2 in the series was born to try to plumb this
through. It was asserted that it would be OK to rely on a fairly
modern display pipeline for this plumbing and perhaps fail to populate
the debugfs file if we're using older/deprecated pipelines.

Patch #1 in the series was born because the bridge chip I was using
was still using an older/deprecated pipeline. While this doesn't get
us fully to a modern pipeline for ti-sn65dsi86 (it still doesn't move
to "NO_CONNECTOR") it hopefully moves us in the right direction.

This was tested on sc7180-trogdor devices with _both_ the ti-sn65dsi86
and the parade-ps8640 bridge chips (since some devices have one, some
the other). The parade-ps8640 already uses supports "NO_CONNECTOR",
luckily.

[1] https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&date=2022-02-02

Changes in v2:
- ("ti-sn65dsi86: Use drm_bridge_connector") new for v2.
- ("drm: Plumb debugfs_init through to panels") new for v2.
- Now using debugfs, not sysfs

Douglas Anderson (3):
  drm/bridge: ti-sn65dsi86: Use drm_bridge_connector
  drm: Plumb debugfs_init through to panels
  drm/panel-edp: Allow querying the detected panel via debugfs

 drivers/gpu/drm/bridge/panel.c         | 12 +++++
 drivers/gpu/drm/bridge/ti-sn65dsi86.c  | 72 +++++---------------------
 drivers/gpu/drm/drm_bridge_connector.c | 15 ++++++
 drivers/gpu/drm/drm_debugfs.c          |  3 ++
 drivers/gpu/drm/panel/panel-edp.c      | 37 +++++++++++--
 include/drm/drm_bridge.h               |  7 +++
 include/drm/drm_connector.h            |  7 +++
 include/drm/drm_panel.h                |  8 +++
 8 files changed, 98 insertions(+), 63 deletions(-)

-- 
2.35.0.263.gb82422642f-goog