20 lines
1 KiB
Text
20 lines
1 KiB
Text
#
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# There is a weird probe issue if both MSM DRM and the panel driver are built
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# as modules: When MSM DRM is loaded it registers the DSI bus for the panel.
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# At this point the panel is not loaded yet, so the kernel sends an uevent
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# to userspace to load the necessary panel module.
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#
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# This causes some delay until the panel module is loaded, so MSM DRM fails to
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# probe temporarily and returns -EPROBE_DEFER (to request probing again later).
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# Unfortunately this will also unregister the DSI bus for the panel, and the
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# kernel will not try probing MSM DRM + panel again until some other (slow)
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# driver loads after MSM DRM.
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#
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# Usually WCNSS (WiFi/BT) fits that criteria, allowing the display to work.
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# But this does not work if the user decides to exclude proprietary firmware.
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#
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# To avoid this problem we add an explicit soft dependency for MSM DRM
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# on the panel module, so modprobe loads the panel module first and MSM DRM
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# will immediately find the panel it is looking for.
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#
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softdep msm pre: panel-yushun-nt35520
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