linux-kernel - Re: [PATCH v3 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

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Date:   Sat, 7 Nov 2020 12:09:25 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Douglas Anderson <dianders@...omium.org>,
        Sean Paul <seanpaul@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v3 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

Hi Stephen

On Mon, Nov 02, 2020 at 10:11:40AM -0800, Stephen Boyd wrote:
> 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.
> 
> 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

All applied to drm-misc-next, thanks,

	Sam