linux-kernel - Re: [PATCH 3/3] drm/bridge: ps8640: Rework power state handling

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Message-ID: <20200821113809.GA283294@ravnborg.org>
Date:   Fri, 21 Aug 2020 13:38:09 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Jernej Skrabec <jernej.skrabec@...l.net>, drinkcat@...omium.org,
        Neil Armstrong <narmstrong@...libre.com>,
        David Airlie <airlied@...ux.ie>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Andrzej Hajda <a.hajda@...sung.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        hsinyi@...omium.org, matthias.bgg@...il.com,
        Collabora Kernel ML <kernel@...labora.com>
Subject: Re: [PATCH 3/3] drm/bridge: ps8640: Rework power state handling

Hi Enric.

> 
> Let me reformulate the question for if it was not clear.
> 
> What I did is be able to read the EDID every time userspace asks for it (so
> kernel enables all the required) and Sam is proposing to just fail if all is not
> setup. I can obviously do this but my question is, at which point I should leave
> all the logic enabled to be able to read the EDID (after probe?, after
> pre_enable, after enable?) It is not clear for me from the API.

I am not clear if my suggestion is a good suggestion.

I recall I saw something similar in another bridge driver.

If no-one else chimes in then go ahead with your original approach
where there is less restriction when it is possible to read edid.

	Sam