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<gamiee>
Hello, any tips about finding out why HDMI output doesn't work on Linux, but works just fine on u-boot ? In dmesg I didn't found any error, and I don't know where to start. I was checking if I have SUN8I_DW_HDMI, and it's enabled (H3 SoC). Thanks!
<jakllsch>
probably some dts issue?
<gamiee>
jakllsch: I'm not sure about that, since I'm using the kernel DT which definitely worked on older kernel (older was probably 5.13, and now I'm using 6.0)
<jakllsch>
DT needs to match kernel version
<gamiee>
Yes, I'm using the DT from the 6.0 kernel repo
<gamiee>
"sun4i-drm display-engine: bound 1ee0000.hdmi" so it seems OK
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<apritzel>
gamiee: is that your own kernel config? Do you have CONFIG_DRM_SUN8I_MIXER and DRM_SUN8I_TCON_TOP enabled?
<gamiee>
apritzel: correct, my own kernel config. I have those two enabled (=y)
<apritzel>
do you have the required clocks and regulator drivers enabled as well?
<jernej>
it seems just cut down version of AC200, only EPHY and efuse
<apritzel>
jernej: ah, very nice, thanks!
<apritzel>
Hopefully I can respin the H616 USB series this week, then turn my attention to the AC200 series again. I guess we should start sending this out for an initial review now.
<apritzel>
jernej: I already got a (nasty) comment about the PHY clock gate patch, apparently this is already used by *some* specific PHYs out there, need to check whether that collides ...
<jernej>
gamiee: HDMI driver loads as expected. Can you add "drm.debug=0x1e" to kernel parameters and try again?
<jernej>
apritzel: that's annoying. Most probably reason why PHY ID is always read as 0 and thus PHY specific driver doesn't load is that PHY needs reset
<jernej>
while in this case doesn't matter as much, it does very much on OrangePi 3 LTS which has motorcomm PHY which doesn't work without loading the PHY driver
<jernej>
gamiee: do you have card0 and card1 devices created?
<jernej>
output you provided is a bit unexpected
<gamiee>
jernej: nope, it's not there in /dev/ :/ And yes, it's very weird
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<gamiee>
jernej: I disabled hdmi in u-boot, still the Linux HDMI doesn't work at all... :/
<gamiee>
I have feeling that something went wrong in Kernel, as on v5.12 (my kernel) and v5.15 (armbian) HDMI works, but v5.17 and v6.00 doesn't work
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<gamiee>
Just theoretically, can this happen because of using uclibc toolchain? Since I built v5.12 kernel, and even here it doesn't work... And I now have 0 ideas why previous buildroot configuration worked just fine, and this new one doesn't...
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<gamiee>
nope, glibc also nothing... well this is weird as hell...
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<jernej>
apritzel: alternatively, you could do the same as smsc and micrel driver do, and enable clock there? it seems acceptable approach and easily doable