Linux/am5728: Starting display at boot time

Mohamed Aslam

Part Number: AM5728
Other Parts Discussed in Thread: THS8200, AM5728

Tool/software: Linux

GoodDay, We interfaced a vga monitor with am5728 using ths8200, Now Display is not starting while booting.

if i start weston and matrix-gui-2.0 services using the command /etc/init.d/weston start and /etc/init.d/matrix-gui-2.0 - display is up with all Hsyc.Vsync and RGB data,

How to make display active while boot time ?

Thanks & Regards

Aslam

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Manisha Agrawal over 8 years ago in reply to Biser Gatchev-XID

TI__Mastermind 22946 points

There are lot of unknowns for us to comment. Please tell us -

Have you written a driver? Where's the code?
Have you made dts changes? If so, what are those changes?
What does boot log show?
What kind of custom board do you have?
What's your need from display to work at boot time?

0 Mohamed Aslam over 8 years ago in reply to Manisha Agrawal

Prodigy 160 points

Hi Manisha,

1- The driver THS8200 is present in the BSP, I didn't make any changes to the driver.

2 - Yes, I edited am57xx-beagle-x15-common.dtsi file .
Added Display2 = &lcd1 for aliases.
Added display timing for SVGA standard

lcd1: display {
compatible = "ti,ths8200", "panel-dpi";

label = "lcd";
/*enable-gpios = <&gpio4 9 GPIO_ACTIVE_HIGH>;*/

panel-timing {
clock-frequency = <40000000>;
hactive = <800>;
vactive = <600>;
hfront-porch = <40>;
hback-porch = <88>;
hsync-len = <128>;
vback-porch = <23>;
vfront-porch = <1>;
vsync-len = <4>;
hsync-active = <1>;
vsync-active = <1>;
de-active = <0>;
pixelclk-active = <1>;
};
port {
lcd_in: endpoint {
remote-endpoint = <&dpi_out>;
};
};
};

We are using Vout2 for vga. so selected dss port reg =1

&dss {
status = "ok";
ports {
#address-cells = <1>;
#size-cells = <0>;

port {
reg = <1>;

dpi_out: endpoint {
remote-endpoint = <&lcd_in>;
data-lines = <24>;
};
};

};
};

3 - boot log showing weston.service is started but display is not active(no Hsync,Vsync) until i manually start using /etc/init.d/weston start

log showing
Starting weston.service...
[ OK ] Started weston.service.

4- We are using AM5728EVM custom board.

5 - We Have requirement that we need LCD and VGA Display output .

Looking forward to hear from you.

Thanks & Regards
Aslam

0 Mohamed Aslam over 8 years ago in reply to Mohamed Aslam

Prodigy 160 points

The weston auto start problem while booting has been resolved.

To start weston service it's required a input device events. so when weston is starting those input event services are not up.
so while starting the weston it's look for the input event in /dev/input/event* if it's not up the weston will fail to start.

To resolve this issue i changed the starting priority of weston.
the starting rc file is present on the location /etc/rc5.d/ default value was 'S09weston' . That changed to S96weston.
to change link the new S96weston to it's actual script present in init.d directory

###################
ln -s /etc/init.d/weston /etc/rc5.d/S96weston

reboot the system

next time the input event will start before weston get started .

Hope this will help somebody.

Thanks & Regards
Aslam

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Linux/am5728: Starting display at boot time