On Sat, Jul 27, 2024 at 08:33:10PM GMT, Alper Nebi Yasak wrote: > Hi, > > I have a MT8186 "Magneton" Chromebook that I'm trying to boot a kernel > based on Collabora's for-kernelci branch [1], using a config from > postmarketOS [2] (intended for that), on a Debian sid installation. > This sometimes fails to enable the display with: > > > panel-simple-dp-aux aux-0-0058: DP AUX done_probing() can't defer The error is caused by mtk_dp_edp_link_panel() returning -EPROBE_DEFER (most likely because something is missing). However this callback must not defer, it's called at at a different point. The actual issue seems to be in these lines. The callback tries to bind all components, however it should not as the DPI isn't available yet. [drm:drm_bridge_attach] *ERROR* failed to attach bridge /soc/dpi@1400a000 to encoder TMDS-32: -517 [drm:mtk_dsi_host_attach] *ERROR* failed to add dsi_host component: -517 anx7625 0-0058: [drm:anx7625_link_bridge] *ERROR* fail to attach dsi to host. > > I know this is a weird out-of-tree combination of things but I've been > asked to report this on the mailing list by wens on the #linux-mediatek > IRC channel. > > [1] https://gitlab.collabora.com/google/chromeos-kernel/-/commits/for-kernelci/ > > [2] https://gitlab.com/postmarketOS/pmaports/-/blob/master/device/testing/linux-postmarketos-mediatek-mt81xx/config-postmarketos-mediatek-mt81xx.aarch64 > > Serial output from the system starting with dmesg and some more info copied below. [trimmed the log] -- With best wishes Dmitry
