09:07 <cengiz_io> hello again marex, card0 is etnaviv, card1 is display-subsystem-card

11:01 <cengiz_io> what could actually cause "modetest -c" to show zero connectors?

11:01 <cengiz_io> kmstest says "All OK"

11:01 <cengiz_io> where do we define connectors for drm?

11:02 <cengiz_io> There are no useful docs for this, sorry for keeping on asking desperately

11:02 <daniels> is modetest actually looking at the right card?

11:03 <daniels> I would suggest using https://github.com/ascent12/drm_info instead of modetest

11:03 <daniels> modetest is ... not very good

11:03 <cengiz_io> daniels I'm trying both cards card0 and card1

11:05 <cengiz_io> will try to compile drm_info now. thanks. the worst part is I've tried every example devicetree definition I could ever find over the last two weeks

11:05 <cengiz_io> none of them helped

11:06 <cengiz_io> can panel-simple work with drm?

11:09 <pcercuei> yes

11:10 <pcercuei> I believe you use a custom (non-upstream) device tree?

11:13 <cengiz_io> pcercuei yes I do

11:13 <cengiz_io> https://github.com/Freescale/linux-fslc/blob/5.4.x%2Bfslc/Documentation/devicetree/bindings/display/imx/fsl-imx-drm.txt I'm trying to follow this (as it's my kernel tree)

11:14 <pcercuei> make sure your panel and display are correctly connected together with ports

11:28 <cengiz_io> pcercuei that's the part I'm struggling most. totally cargo cult programming that..

11:28 <cengiz_io> daniels can you take a quick look at this drm_info.json ? anything irregular? other than no connectors... https://gist.github.com/cengizIO/3bb36a8e4e3f0ae0629f5d70bd590268

11:32 <pcercuei> can you share your devicetree?

11:41 <daniels> yeah, no connectors and no encoders makes me think that you're either missing some modules (bridge, power regulator, panel, etc) or missing the device tree

11:43 <pcercuei> it could be that the panel driver does not probe. Did you check dmesg?

12:21 <cengiz_io> pcercuei here you go: https://gist.github.com/cengizIO/03eeba571b824c27273675f9eb91db3b

12:21 <cengiz_io> I've checked dmesg, panel-simple is nowhere to be seen but imx-drm seems to initialize perfectly

12:22 <pcercuei> rgrep "tianma,tm050rdzg03" drivers/gpu/drm/panel/

12:22 <pcercuei> returns nothing

12:22 <cengiz_io> that's in a patch on my tree

12:22 <pcercuei> ok

12:23 <pcercuei> ok, I see the problem

12:23 <pcercuei> lines 37 to 52 should be inside a ports { } node

12:24 <cengiz_io> https://gist.github.com/cengizIO/f719a5432680cc515e58ebf9bbd8a96d

12:24 <cengiz_io> let me take a look

12:25 <cengiz_io> I've wrapped them now. how did you figure that out?

12:25 <pcercuei> experience :)

12:25 <cengiz_io> because I've copied this from some example and they didn't add that... :/

13:12 <cengiz_io> well pcercuei I got bad news and good news

13:12 <cengiz_io> good news: now dtc is complaining about port definitions. it didn't parse them before. thanks for that

13:12 <cengiz_io> bad news: still no simple panel getting probed or any connectors listed

13:13 <pcercuei> well it's not normal that it complains

13:13 <cengiz_io> pcercuei I should be able to see something related to ipu1_ds0 in dmesg right? there are only capture devices listed in dmesg

13:13 <cengiz_io> just warnings

13:13 <pcercuei> you can't have warnings and expect stuff to work ;)

13:14 <cengiz_io> Warning (reg_format): /display/ports/port@0:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)

13:15 <pcercuei> you need to have the #address-cells and #size-cells properly set, like this: https://github.com/torvalds/linux/blob/master/arch/mips/boot/dts/ingenic/jz4725b.dtsi#L318-L329

13:16 <cengiz_io> where do those numbers come from?

13:16 <pcercuei> devicetree documentation

13:18 <pcercuei> this is for another SoC and another driver btw, which expects the IPU to be at port 8

13:18 <pcercuei> in your case it's port 0

13:20 <cengiz_io> oh ok

20:23 <cengiz_io> is there any other requirement to probe panel-simple other than using a matching compatible string in devicetree and enabling CONFIG_DRM_PANEL_SIMPLE?