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Message-ID: <a2bde8d7-8a30-3f29-b4bd-629416ae20c5@baylibre.com>
Date:   Thu, 20 Jul 2023 16:30:45 +0200
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Subject: Re: [PATCH v6 09/11] drm/mediatek: dp: Add support for embedded
 DisplayPort aux-bus
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To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>, chunkuang.hu@kernel.org
Cc:     p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch,
        matthias.bgg@gmail.com, dri-devel@lists.freedesktop.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, kernel@collabora.com,
        wenst@chromium.org, nfraprado@collabora.com
References: <20230717141438.274419-1-angelogioacchino.delregno@collabora.com>
 <20230717141438.274419-10-angelogioacchino.delregno@collabora.com>
From:   Alexandre Mergnat <amergnat@baylibre.com>
In-Reply-To: <20230717141438.274419-10-angelogioacchino.delregno@collabora.com>
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Reviewed-by: Alexandre Mergnat <amergnat@baylibre.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