[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <7a3257dddac78c46408341253a3286f4@kernel.org>
Date: Wed, 30 Aug 2023 13:11:35 +0200
From: Michael Walle <mwalle@...nel.org>
To: NĂcolas F. R. A. Prado
<nfraprado@...labora.com>
Cc: angelogioacchino.delregno@...labora.com, airlied@...il.com,
amergnat@...libre.com, chunkuang.hu@...nel.org, ck.hu@...iatek.com,
daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
ehristev@...labora.com, kernel@...labora.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-mediatek@...ts.infradead.org, matthias.bgg@...il.com,
p.zabel@...gutronix.de, wenst@...omium.org
Subject: Re: [PATCH v7 09/11] drm/mediatek: dp: Add support for embedded
DisplayPort aux-bus
>> While digging through the code I realized that all the outputs and
>> pipelines
>> are harcoded. Doh. For all the mediatek SoCs. Looks like major
>> restriction
>> to
>> me. E.g. there is also DSI and HDMI output on the mt8195. I looked at
>> the
>> downstream linux and there, the output is not part of the pipeline.
>> Are you
>> aware of any work in that direction?
>
> I'm not sure I get what output and pipelines are hardcoded that you're
> referring
> to (besides the one in the mtk-dsi/dpi driver that you already sent the
> patch
> fixing).
Have a look at [1]. That main path ends with the DP_INTF0 which is the
eDP output. But from what I understand that path can also use the DSI
output. But that is a pattern for all the paths in that file. Looks like
all supported boards in the kernel will have the output type for a given
SoC/path (or maybe the mt8195 is the first one which supports different
output interfaces).
If you have a look at the mediatek kernel instead [2], there the last
part of the path is not fixed, but there is also a .conn_routes property
by which you seem to be able to choose the actual output interface.
I was just curious if you know of any development for that (or similar)
in the kernel.
-michael
> And I'm not familiar with the DSI and HDMI output support on MT8195, so
> I can't
> help with that.
>
> Thanks,
> NĂcolas
[1]
https://elixir.bootlin.com/linux/v6.5/source/drivers/gpu/drm/mediatek/mtk_drm_drv.c#L210
[2]
https://gitlab.com/mediatek/aiot/bsp/linux/-/blob/mtk-v5.15-dev/drivers/gpu/drm/mediatek/mtk_drm_drv.c?ref_type=heads#L425
Powered by blists - more mailing lists