L6.6, sn65dsi83 Error:

pavelko — Tue, 08 Apr 2025 08:46:29 GMT

I'm trying to make sn65dsi84 dsi2lvds bridge working with Linux kernel 6.6.52 (Yocto scartgap).

After fixing problems with attaching mipi-dsi to SN65DSI83 driver: IMX8MM-sn65dsi83-yocto-scarthgap-mipi-dsi-is-not-initialized

and correcting LVDS timing parameters in DT: Error-Cannot-find-any-crtc-or-sizes -

facing another problem: seems that MIPI-DSI is not sending data:

SN65DSI83driver cannot lock PLL because it has DSI source clock.

[ 2.946302] sn65dsi83 0-002c: failed to lock PLL, ret=-110

my devicetree is:

/dts-v1/; #include "imx8mm.dtsi" / { panel: panel10inch { width-mm = <210>; height-mm = <157>; compatible = "panel-lvds"; backlight = <&bl_lcd>; data-mapping = "vesa-24"; status = "okay"; enable-gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>; panel-timing { clock-frequency = <65000000>; hactive = <1024>; vactive = <768>; /* */ hfront-porch = <40>; hsync-len = <60>; hback-porch = <220>; /* */ vfront-porch = <7>; vsync-len = <10>; vback-porch = <21>; /* */ vsync-active = <0>; hsync-active = <0>; de-active = <1>; pixelclk-active = <0>; }; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; panel_in: endpoint { remote-endpoint = <&bridge_out>; }; }; }; }; }; &i2c1 { dsi_lvds_bridge: sn65dsi84@2c { compatible = "ti,sn65dsi83"; reg = <0x2c>; enable-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_dsi_bridge>; vcc-supply = <&reg_1V8>; status = "okay"; of-depends-on = <&panel>; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; bridge_in: endpoint { remote-endpoint = <&mipi_dsi_out>; data-lanes = <1 2 3 4>; }; }; port@2 { reg = <2>; bridge_out: endpoint { remote-endpoint = <&panel_in>; }; }; }; }; }; &lcdif { status = "okay"; }; &mipi_dsi { status = "okay"; port@1 { mipi_dsi_out: endpoint { remote-endpoint = <&bridge_in>; data-lanes = <1 2 3 4>; /*lane-polarities = <1 0 0 0 0>;*/ attach-bridge; }; }; };

bootlog is attached.

Re: L6.6, sn65dsi83 Error:

pavelko — Tue, 08 Apr 2025 08:47:15 GMT

Re: L6.6, sn65dsi83 Error:

pavelko — Tue, 08 Apr 2025 09:17:05 GMT

Found strange thing:

[    2.946302] sn65dsi83 0-002c: failed to lock PLL, ret=-110
[    2.948106] imx_sec_dsim_drv 32e10000.mipi_dsi: imx_sec_dsim_encoder_atomic_enable: Enter
[    2.951027] sn65dsi83 0-002c: sn65dsi83_atomic_enable: Enter
[    2.956980] sn65dsi83 0-002c: Unexpected link status 0x01

The sn65dsi83 probe function pries to lock PLL from MIPI-DSI before imx_sec_dsim_encoder_atomic_enable() function ensbles it.

Moved piece of code that sets PLL to sn65dsi83_atomic_enable() function.

Works now!

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