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Date: Sat, 16 Jan 2021 13:40:25 +0200 From: aleksandr.o.makarov@...il.com To: Andrzej Hajda <a.hajda@...sung.com>, Neil Armstrong <narmstrong@...libre.com>, Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...l.net>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Sam Ravnborg <sam@...nborg.org>, Philippe Cornu <philippe.cornu@...com>, Antonio Borneo <antonio.borneo@...com>, "<dri-devel@...ts.freedesktop.org>" <linux-kernel@...r.kernel.org> Subject: drm: panel: panel-raydium68200 driver fails to write MIPI DSI init commands 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. the panel, then it would bring up just fine. View attachment "dmesg-2021-01-15T16:36:02+02:00" of type "text/plain" (75234 bytes) View attachment "rockpro64-rm68200.patch" of type "text/x-patch" (2721 bytes)
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