Created attachment 294653 [details] Enabling MIPI DSI panel I need to bring up my MIPI DSI 1280x720 EDT ETML0500F3DHA panel on a RockPro64 V2.1 board. There is no completely suitable in-tree driver for that panel yet, but for the purpose of reproducing the issue that I face, the gpu/drm/panel/panel-raydium-rm68200.c can do just fine. To reproduce: - Get the same Linux 5.9.14 as on my RockPro64 board (with Armbian 20.11.6 on it) - Patch the rk3399-rockpro64.dts to add a panel node that is compatible with "raydium,rm68200" driver on MIPI interface (rockpro64-rm68200.patch attached) - Compile and put the resulting rk3399-rockpro64.dtb on the target system. The panel driver shall then get probed at next boot. The kernel log shall contain following errors: [ 10.139957] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.139988] [drm:rm68200_dcs_write_cmd.isra.4 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write failed: -110 [ 10.160972] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.161000] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.181929] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.181953] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.202923] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.202947] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.223064] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.223094] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.226104] zram1: detected capacity change from 0 to 52428800 [ 10.244027] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.244073] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.265024] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.265064] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.285711] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.285746] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.305926] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.305955] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.326996] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.327039] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 [ 10.348030] dw-mipi-dsi-rockchip ff960000.mipi: failed to write command FIFO [ 10.348074] [drm:rm68200_dcs_write_buf.isra.5 [panel_raydium_rm68200]] *ERROR* MIPI DSI DCS write buffer failed: -110 It's remarkable that if to pull the module panel-rm682000 out and then back in, there are no errors mentioned. I can for sure say that those commands become effective - I start seeing colourful stripes on the display after. That is, if I would send the correct command set to the panel, then it would bring up just fine.
Created attachment 294655 [details] Complete kernel log