Linux/AM5728: LCD configuration

Chandrashekar P

Intellectual 870 points

Part Number: AM5728
Other Parts Discussed in Thread: TPD12S015, DS90CR217

Tool/software: Linux

Hello All,

Environment setup using:

OS: ubuntu 16.04

Ti-SDK:ti-processor-sdk-linux-am57xx-evm-04.02.00.09

I'm integrating 10.4"(800x600) display to our AM5728 custom board. Facing issue on lcd display bring up, please find the attached kernel log, config & dts file.

Their is some problem with clarity, not sure issue with graphic driver side, weston side, RGB or resolution. Please go through attached file, snap shot once.

4540.AM5728.tar.gz

I commented the below lines in am57xx-beagle-x15.dts files:

#if 0
&tpd12s015 {
gpios = <&gpio7 10 GPIO_ACTIVE_HIGH>, /* gpio7_10, CT CP HPD */
<&gpio6 28 GPIO_ACTIVE_HIGH>, /* gpio6_28, LS OE */
<&gpio7 12 GPIO_ACTIVE_HIGH>; /* gpio7_12/sp1_cs2, HPD */
};
#endif

If any changes required on dts, kernel config, please do let me know to bring up LCD.

Thanks.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

See processors.wiki.ti.com/.../Linux_Core_DSS_User's_Guide

0 Chandrashekar P over 8 years ago in reply to Biser Gatchev-XID

Intellectual 870 points

Thanks Biser,

Can you please tell if we are using lcd in 18 bit mode, what are the lines to be connect to lcd to lvds converter ic(SN65LVDS93ADGGR).

Please find the attached snap shot, is the hardware connections are fine, let us know.

Thanks.

0 Biser Gatchev-XID over 8 years ago in reply to Chandrashekar P

TI__Guru**** 393215 points

I am not sure it will work this way. Even though you have connected only 18 of the 24 data bits, the LVDS transmitter will still clock out 24 bits of LCD data. You need a part that will transmit 18 bits of data plus the 3 control signal, something like DS90CR217.

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Linux/AM5728: LCD configuration