linux-kernel - Re: [PATCH v6 09/11] drm/mediatek: dp: Add support for embedded DisplayPort aux-bus

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Date:   Thu, 20 Jul 2023 16:30:45 +0200
From:   Alexandre Mergnat <amergnat@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, chunkuang.hu@...nel.org
Cc:     p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
        matthias.bgg@...il.com, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com,
        wenst@...omium.org, nfraprado@...labora.com
Subject: Re: [PATCH v6 09/11] drm/mediatek: dp: Add support for embedded
 DisplayPort aux-bus

Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>

On 17/07/2023 16:14, AngeloGioacchino Del Regno wrote:
> For the eDP case we can support using aux-bus on MediaTek DP: this
> gives us the possibility to declare our panel as generic "panel-edp"
> which will automatically configure the timings and available modes
> via the EDID that we read from it.
> 
> To do this, move the panel parsing at the end of the probe function
> so that the hardware is initialized beforehand and also initialize
> the DPTX AUX block and power both on as, when we populate the
> aux-bus, the panel driver will trigger an EDID read to perform
> panel detection.
> 
> Last but not least, since now the AUX transfers can happen in the
> separated aux-bus, it was necessary to add an exclusion for the
> cable_plugged_in check in `mtk_dp_aux_transfer()` and the easiest
> way to do this is to simply ignore checking that when the bridge
> type is eDP.

-- 
Regards,
Alexandre