linux-kernel - drm: panel: panel-raydium68200 driver fails to write MIPI DSI init commands

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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)