Hi Nikolaus,
Le mar., nov. 9 2021 at 21:19:17 +0100, H. Nikolaus Schaller
<hns@xxxxxxxxxxxxx> a écrit :
Hi Paul,
Am 07.11.2021 um 20:05 schrieb Paul Cercueil <paul@xxxxxxxxxxxxxxx>:
6. Therefore I think it *may* work overclocked with 48MHz
but is not guaranteed or reliable above 27 MHz.
So everything is ok here.
One thing though - the "assigned-clocks" and
"assigned-clock-rates", while it works here, should be moved to the
CGU node, to respect the YAML schemas.
Trying to do this seems to break boot.
I can boot up to
[ 8.312926] dw-hdmi-ingenic 10180000.hdmi: registered DesignWare
HDMI I2C bus driver
and
[ 11.366899] [drm] Initialized ingenic-drm 1.1.0 20200716 for
13050000.lcdc0 on minor 0
but then the boot process becomes slow and hangs. Last sign of
activity is
[ 19.347659] hub 1-0:1.0: USB hub found
[ 19.353478] hub 1-0:1.0: 1 port detected
[ 32.321760] wlan0_power: disabling
What I did was to just move
assigned-clocks = <&cgu JZ4780_CLK_HDMI>;
assigned-clock-rates = <27000000>;
from
hdmi: hdmi@10180000 {
to
cgu: jz4780-cgu@10000000 {
Does this mean the clock is assigned too early or too late?
Do you have any suggestions since I don't know the details of CGU.
These properties are already set for the CGU node in ci20.dts:
&cgu {
/*
* Use the 32.768 kHz oscillator as the parent of the RTC for a higher
* precision.
*/
assigned-clocks = <&cgu JZ4780_CLK_OTGPHY>, <&cgu JZ4780_CLK_RTC>;
assigned-clock-parents = <0>, <&cgu JZ4780_CLK_RTCLK>;
assigned-clock-rates = <48000000>;
};
So you want to update these properties to add the HDMI clock setting,
like this:
assigned-clocks = <&cgu JZ4780_CLK_OTGPHY>, <&cgu JZ4780_CLK_RTC>,
<&cgu JZ4780_CLK_HDMI>;
assigned-clock-parents = <0>, <&cgu JZ4780_CLK_RTCLK>;
assigned-clock-rates = <48000000>, <0>, <27000000>;
Cheers,
-Paul
