linux-kernel - [RFC PATCH 0/6] drm/dp: Improvements for DP AUX channel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220409023628.2104952-1-dianders@chromium.org>
Date:   Fri,  8 Apr 2022 19:36:22 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Robert Foss <robert.foss@...aro.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        Philip Chen <philipchen@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...el.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Kees Cook <keescook@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lyude Paul <lyude@...hat.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/6] drm/dp: Improvements for DP AUX channel

This patch addresses pre-existing issues that came up during the
review process of Sankeerth's series trying to add eDP for Qualcomm
SoCs [1].

It's really sorta two series but jammed into one. The first two
patches fix a problem with ps8640 when the panel doesn't finish
probing right away. The rest of the patches attempt to improve how eDP
panel drivers deal with the HPD signal. NOTE: if everyone hates the
"generic driver" that I added in the first patch, I have a different
version that just adds uses the Linux auxiliary bus stright in
ps8640. I'm happy to switch back to that, but it seemed like a buncha
copy-pasta that I was hoping to avoid.

I haven't done a crazy amount of testing with this, but it seems to
work and I wanted to get something out there. I'll try to do some more
testing next week. This is why I added the tag "RFC". It's entirely
possibled that I've actually caught all the bugs and this is great,
but I just wanted to be sure.

This _doesn't_ attempt to fix the Analogix driver. If this works out,
ideally someone can post a patch up to do that.

[1] https://lore.kernel.org/r/1648656179-10347-2-git-send-email-quic_sbillaka@quicinc.com/

Douglas Anderson (6):
  drm/dp: Helpers to make it easier for drivers to use DP AUX bus
    properly
  drm/bridge: parade-ps8640: Break probe in two to handle DP AUX better
  drm/dp: Add is_hpd_asserted() callback to struct drm_dp_aux
  drm/panel-edp: Take advantage of is_hpd_asserted() in struct
    drm_dp_aux
  drm/panel: atna33xc20: Take advantage of is_hpd_asserted() in struct
    drm_dp_aux
  drm/bridge: parade-ps8640: Provide is_hpd_asserted() in struct
    drm_dp_aux

 drivers/gpu/drm/bridge/parade-ps8640.c        |  87 +++++----
 drivers/gpu/drm/dp/drm_dp_aux_bus.c           | 165 +++++++++++++++++-
 drivers/gpu/drm/panel/panel-edp.c             |  37 +++-
 .../gpu/drm/panel/panel-samsung-atna33xc20.c  |  35 +++-
 include/drm/dp/drm_dp_aux_bus.h               |  58 ++++++
 include/drm/dp/drm_dp_helper.h                |  14 ++
 6 files changed, 353 insertions(+), 43 deletions(-)

-- 
2.35.1.1178.g4f1659d476-goog