linux-kernel - [PATCH 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

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Message-Id: <20201029011154.1515687-1-swboyd@chromium.org>
Date:   Wed, 28 Oct 2020 18:11:50 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Douglas Anderson <dianders@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sean Paul <seanpaul@...omium.org>
Subject: [PATCH 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

This patch series cleans up the DDC code a little bit so that
it is more efficient time wise and supports grabbing the EDID
of the eDP panel over the aux channel. I timed this on a board
I have on my desk and it takes about 20ms to grab the EDID out
of the panel and make sure it is valid.

The first two patches seem less controversial so I stuck them at
the beginning. The third patch does the EDID reading and caches
it so we don't have to keep grabbing it over and over again. And
finally the last patch updates the reply field so that short
reads and nacks over the channel are reflected properly instead of
treating them as some sort of error that can't be discerned.

I was thinking about making a patch to update the drm bridge connector
code to fallback to using the DDC of the bridge if it's available. Does
that code already exist? It would be nice to not even have to implement
the bridge func get_edid() function in the future if the DDC is
implemented and we're using the new bridge connector code.

Stephen Boyd (4):
  drm/bridge: ti-sn65dsi86: Combine register accesses in
    ti_sn_aux_transfer()
  drm/bridge: ti-sn65dsi86: Make polling a busy loop
  drm/bridge: ti-sn65dsi86: Read EDID blob over DDC
  drm/bridge: ti-sn65dsi86: Update reply on aux failures

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 101 ++++++++++++++++++--------
 1 file changed, 69 insertions(+), 32 deletions(-)

Cc: Douglas Anderson <dianders@...omium.org>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: Jonas Karlman <jonas@...boo.se>
Cc: Jernej Skrabec <jernej.skrabec@...l.net>
Cc: Sean Paul <seanpaul@...omium.org>

base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
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