# # There is a weird probe issue if both MSM DRM and the panel driver are built # as modules: When MSM DRM is loaded it registers the DSI bus for the panel. # At this point the panel is not loaded yet, so the kernel sends an uevent # to userspace to load the necessary panel module. # # This causes some delay until the panel module is loaded, so MSM DRM fails to # probe temporarily and returns -EPROBE_DEFER (to request probing again later). # Unfortunately this will also unregister the DSI bus for the panel, and the # kernel will not try probing MSM DRM + panel again until some other (slow) # driver loads after MSM DRM. # # Usually WCNSS (WiFi/BT) fits that criteria, allowing the display to work. # But this does not work if the user decides to exclude proprietary firmware. # # To avoid this problem we add an explicit soft dependency for MSM DRM # on the panel module, so modprobe loads the panel module first and MSM DRM # will immediately find the panel it is looking for. # softdep msm pre: panel-samsung-s6e88a0-ams452ef01