Adding LVDS Bridge (sn65dsi84) to iMX8mm

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Adding LVDS Bridge (sn65dsi84) to iMX8mm

128 Views
Contributor I

I am trying to add the LVDS bridge snd65dsi84 to our custom board based on the iMX8mm processor.  I am having difficulty finding the right information on how to configure the DTS files for both PWM and for 2 enable lines for the backlight, and where to make changes for the LVDS.

 

Thanks,

Chris

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8 Replies

72 Views
Contributor I

I also get this message after adding this line to my config file.

CONFIG_DRM_TI_SN65DSI84=y

 

Value requested for CONFIG_DRM_TI_SN65DSI84 not in final .config

 

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NXP TechSupport
NXP TechSupport

specific timings for used lcd can be added to dts as in above example:

 

&mipi_dsi {
status = "okay";
 
panel@0 {
reg = <0>;
compatible = "tn,dsi2lvds-panel";
dsi,flags = <0x0007>;
dsi,format = <0>;
dsi,lanes = <4>;
panel-width-mm = <153>;
panel-height-mm = <90>;
bus-flags = <1>;
refresh-rate = <60>;
rotate = <0>;
/* horz-flip; */
/* vert-flip; */
 
display-timings {
native-mode = <&timing0>;
timing0: hj070na {
clock-frequency = <51000000>;
hactive = <1024>;
vactive = <600>;
hfront-porch = <120>;
hsync-len = <100>;
hback-porch = <90>;
vfront-porch = <1>;
vsync-len = <33>;
vback-porch = <1>;
hsync-active = <1>;
vsync-active = <1>;
};
};
};

};

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Contributor I

Yes, I have this already configured, but the traces below is the bigger issue ?

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46 Views
NXP TechSupport
NXP TechSupport

one can check with lcd manufacturer what should be correct initialization for

used lcd and add it in driver.

 

Best regards
igor

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118 Views
NXP TechSupport
NXP TechSupport

Hi injaneer1

 

one can look at below example

https://github.com/TechNexion-customization/linux-imx-tn/blob/tn-imx_4.14.98_2.0.0_ga-wip-mipi2lvds/...

 

Best regards
igor

 

 

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113 Views
Contributor I

Thanks,  Where can I get the driver Or is one  not necessary ?  Also I am running Android 10, will the above example apply the same way for that ?

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99 Views
NXP TechSupport
NXP TechSupport

technexion linux already includes driver

https://github.com/TechNexion-customization/linux-imx-tn/tree/tn-imx_4.14.98_2.0.0_ga-wip-mipi2lvds

drivers/gpu/drm/bridge/sn65dsi84-dsi2lvds.c

https://github.com/TechNexion-customization/linux-imx-tn/blob/tn-imx_4.14.98_2.0.0_ga-wip-mipi2lvds/...

General description on linux video subsystem can be found in  i.MX Linux Reference Manual​

 

Best regards
igor

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85 Views
Contributor I

This is not actually an example.  Just pointed me to a dts file.  However, I have been able to find the settings in here and the included dts, I found a driver I think (no readme or anything can be found).  I have managed to get the backlight working with this post.


We are running Android 10 not linux so really need a copy of the kernel-imx folder with these settings.

 

When I run our board I get this.

[ 1.371688] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.378324] [drm] No driver support for vblank timestamp query.
[ 1.384326] imx-drm soc@0:bus@32c00000:display-subsystem: bound imx-lcdif-crtc.0 (ops lcdif_crtc_ops)
[ 1.394252] imx_sec_dsim_drv 32e10000.mipi_dsi: version number is 0x1060200
[ 1.402541] imx_sec_dsim_drv 32e10000.mipi_dsi: Failed to attach bridge: 32e10000.mipi_dsi
[ 1.410878] imx_sec_dsim_drv 32e10000.mipi_dsi: failed to bind sec dsim bridge: -517
[ 1.418669] imx-drm soc@0:bus@32c00000:display-subsystem: failed to bind 32e10000.mipi_dsi (ops imx_sec_dsim_ops): -517
[ 1.429543] imx-drm soc@0:bus@32c00000:display-subsystem: master bind failed: -517

 

Thanks

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