On Tue, May 21, 2019 at 07:24:32AM +0000, Kamps, John-Eric wrote:
> Hi Jagan
>
> >Possible checks.
>
> >01. Try the bsp first, since we don't have any kind of reference documents.
> OK I will compare them
>
> >02: Identify the working pixel clock rates along with dividers
> I will check the kernel log from the original device.
>
> >03: Better get the regmap of tcon0 and other sequence for cross
> >verification.
> How can I get these values? Is there a bash command, or debugging, log
> output, syslog interface file?
Using busybox `devmem` applet or devmem2 utility.
If you're using Armbian/Debian just `apt install busybox`.
And sample usage of the devmem applet I used to debug hdmi issues on A20:
[snip]
#! /bin/bash
function dump {
base=$1
size=$2
for((i=0;i<$size;i=i+4)) ; do
addr=$(($base + $i))
data=$(busybox devmem $addr)
echo $(printf '%#x: %s' $addr $data)
done
}
function f {
dump $(( $1 )) $(( $2 ))
}
# XXX: These are A20 addresses and block sizes
# tcon0
f 0x01c0c000 0x1000
# ccu
f 0x01c20000 0x400
[/snip]
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