How to add one new LVDS panel's EDID to PTN3460

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Revision as of 08:16, 2 January 2024 by Winston.huang (talk | contribs)
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Prerequisites

On Host PC

  • LVDS panel's EDID config (128 bytes)
  • (optional) one utility to edit EDID config
  • PTN3460 Programming Guide

On RSB-3810 (Ubuntu)

  • i2c-tools installed
sudo apt update
sudo apt install i2c-tools

Convert EDID config to i2cset commands

EDIDNEW=6 # set EDID
EDIDBIN=g070vw01v0.bin
SCRIPT=set_new_edid.sh

REG81=`printf "0x%02x" 0` # Please refer to the PTN3460 Programming Guide to set correct value
REG84=`printf "0x%02x" $((2*EDIDNEW + 1))`
REG85=`printf "0x%02x" $EDIDNEW`

cat << EOT > $SCRIPT
#!/bin/bash
i2cset -f -y 2 0x20 0x85 $REG85 b

$(
xxd -c 16 -ps $EDIDBIN | 
sed "s/../0x& /g; s/ *$//" | 
for ADDR in `seq 0x00 0x10 0x70`; do
  read 
  echo i2cset -f -y 2 0x20 `printf "0x%02x" $ADDR` $REPLY i
done
)

i2cset -f -y 2 0x20 0x81 $REG81 b
i2cset -f -y 2 0x20 0x84 $REG84 b
i2cset -f -y 2 0x20 0xe8 0x01 0x78 0x45 0x56 i
EOT

chmod +x $SCRIPT

run the script and reboot

sudo ./$SCRIPT
sudo reboot

flash new firmware.vfat

get and extract update_edid.tgz

tar xvf update_edid.tgz

flash u-boot env & firmware (dtb)

genio-flash mmc0boot1 firmware firmware_b

config u-boot env to ebable LVDS display

(choose 1,3,4,5 or 6 as a new EDID, use 6 as example below)
break countdown in u-boot

  • Multi-display (HDMI + LVDS)
The LVDS is always major display that has nothing to do with the specified order.
setenv list_dbto "gpu-mali.dtbo video.dtbo apusys.dtbo hdmi.dtbo lvds6.dtbo"
saveenv
reset
  • LVDS only
setenv list_dbto "gpu-mali.dtbo video.dtbo apusys.dtbo lvds6.dtbo"
saveenv
reset