Winston.huang: /* Step-by-step procedures */

2024-01-03T09:03:39Z

‎Step-by-step procedures

Winston.huang: Created page with "{{DISPLAYTITLE:How to add EDID for LVDS panel}} == Prerequisites == * PTN3460 Programming Guide * EDID config (128 bytes) * i2c-tools installed ..."

2024-01-02T09:38:23Z

Created page with "{{DISPLAYTITLE:How to add EDID for LVDS panel}} == Prerequisites == * PTN3460 Programming Guide * EDID config (128 bytes) * i2c-tools installed <syntaxhighlight lang="bash">..."

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{{DISPLAYTITLE:How to add EDID for LVDS panel}}

== Prerequisites ==
* PTN3460 Programming Guide
* EDID config (128 bytes)
* i2c-tools installed
<syntaxhighlight lang="bash">
sudo apt update
sudo apt install i2c-tools
</syntaxhighlight>

== Step-by-step procedures ==
(use EDID 6 and panel G070VW01V0 as example)
=== On Ubuntu ===
create the setup script from EDID config
<syntaxhighlight lang="bash">
EDIDNEW=6
EDIDBIN=g070vw01v0.bin
SCRIPT=~/set_edid_${EDIDNEW}.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" $EDIDNEW)
echo -e "REG81:$REG81\nREG84:$REG84\nREG85:$REG85\n"

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
</syntaxhighlight>

run the script and reboot
<syntaxhighlight lang="bash">
sudo $SCRIPT
sudo reboot
</syntaxhighlight>

=== On U-Boot ===
Press any key to stop auto boot, and set matched device tree overlay (dtbo)
* Multi-display (HDMI + LVDS)
: The LVDS is always major display that has nothing to do with the specified order.
<syntaxhighlight lang="bash">
setenv DISPLAY hdmi.dtbo lvds6.dtbo
saveenv
reset
</syntaxhighlight>

* LVDS only
<syntaxhighlight lang="bash">
setenv DISPLAY lvds6.dtbo
saveenv
reset
</syntaxhighlight>

== Appendix ==
=== How to fetch and store EDID config ===
(use the pre-set EDID 2, panel G070VW01V0, as example)
<syntaxhighlight lang="bash">
EDID=2
EDIDBIN=g070vw01v0.bin

sudo i2cset -f -y 2 0x20 0x85 $EDID b

for DA in $(seq 0 0x10 0x70); do
sudo i2cget -f -y 2 0x20 $DA i 0x10
done | xxd -r -p > $EDIDBIN
</syntaxhighlight>

@@ Line 12: / Line 12: @@
 == Step-by-step procedures ==
 (use EDID 6 and panel G070VW01V0 as example)
 === On Ubuntu ===
 create the setup script from EDID config
@@ Line 49: / Line 67: @@
 sudo $SCRIPT
 sudo reboot
 </syntaxhighlight>

AIMLinux/BSP/Linux/MT8395/add edid - Revision history

Winston.huang: /* Step-by-step procedures */

Winston.huang: Created page with "{{DISPLAYTITLE:How to add EDID for LVDS panel}} == Prerequisites == * PTN3460 Programming Guide * EDID config (128 bytes) * i2c-tools installed ..."