On Wed, Aug 30, 2023 at 7:11 PM Michael Walle <mwalle@xxxxxxxxxx> wrote: > > >> 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. This is probably because support for this SoC began with Chromebooks, which have fixed and defined uses for the pipelines. I suspect that what you are working on is much more flexible. The driver should be made to allow dynamic selection of outputs, as is commonly seen with other drivers, but I don't know if that's on anyone's TODO list. ChenYu > > And I'm not familiar with the DSI and HDMI output support on MT8195, so > > I can't > > help with that. > > > > Thanks, > > Nícolas > > [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
