04:17 <manawyrm> Hi, I'm searching for the best way (in terms of performance) of rotating the output to a MIPI-DSI display on a RK3326 platform, using Panfrost.

04:17 <manawyrm> Currently using xrandr/Xorg rotate, which seems to be done in software and is pretty slow. Is there a better/generalized way to do GPU rotation?

22:53 <punit> manawyrm: Does the display controller on RK3326 support rotation? You can look at the output of `modetest` to see if it is - I reckon that'd be the most efficient way to do rotation as it's done during scanout IIUC

22:55 <manawyrm> punit: hm, I've found a datasheet for the MIPI display controller in the meantime and have found a way to get the display to rotate it's memory content directly. Still having issues with parts of the screen content missing, though.

22:56 <manawyrm> Will need to investigate that further, later.

22:56 <macc24> manawyrm: android guys on odroid forums have investigated that

22:56 <manawyrm> macc24: oh, really? Some more hints/links?

22:57 <macc24> i don't have any

22:59 <punit> "rotate memory content = done during scanout" - we might be talking about the same thing

22:59 <macc24> punit: not same thing, your idea was to rotate on soc itself and manawyrm was talking about making display do the rotation

22:59 <manawyrm> ... mh, not sure. The panel driver has no notion of orientation until now

23:00 <manawyrm> there's a MIPI command which can flip rows/columns of the panel

23:00 <punit> Ah I see - I was definitely talking about rotation on SoC

23:00 <macc24> panel rotation in kernel's drm subsystem ONLY tells userspace to rotate

23:00 <macc24> and doesn't do anything by itself

23:01 <manawyrm> Yeah, it looks like in-panel/MIPI rotation isn't really supported by anything.

23:01 <manawyrm> But that wouldn't be an issue if it would work like I think it should :D

23:01 <punit> I hadn't realised something like in-panel rotation exists... TIL

23:01 <macc24> manawyrm: oh

23:02 <manawyrm> -> https://www.elecrow.com/download/ILI9488%20Data%20Sheet_100.pdf

23:02 <macc24> just remembered

23:02 <manawyrm> Page 192

23:02 <manawyrm> Memory Access Control Operation 0x36

23:02 <macc24> i use a rotated display on my desktop

23:02 <macc24> and it has literally no performance loss

23:02 <manawyrm> macc24: yeah, but with what GPU?

23:02 <macc24> on sway at least

23:02 <macc24> manawyrm: rx460

23:02 <macc24> it hardly ever spins up

23:02 <macc24> its fans up*

23:02 <manawyrm> yep, that's AMDGPU, completly different story. amdgpu is pretty awesome.

23:03 <macc24> well, my laptop has a rotated screen to, and on sway no performance loss either

23:03 <manawyrm> try it on something with an old i915 card, like 3rd or 4th generation Intel HW

23:03 <manawyrm> flip the screen (on HDMI) 90°

23:04 <manawyrm> I did that on a Intel NUC for work, super slow, horrible frame tearing, yuck!

23:04 <macc24> i was testing performance of sway rotation on my rk3288 laptop with gpu performance near ironlake intel gpu

23:05 <macc24> manawyrm: https://github.com/tonyjih/RG351P-linux/commit/57d459b5f4d90f275d314e340ffbb582198144ec

23:18 <manawyrm> 15 36 F8

23:18 <manawyrm> 05 01

23:18 <manawyrm> Ouch, that's a soft reset directly after the memory access setting. Hope that's not the issue.

23:18 <macc24> you might want to talk to macromorgan about that

23:19 <manawyrm> But the Blanking Porch Control field sounds really interesting.

23:19 <macc24> he's done something about this iirc

23:29 <diederik> is SND_SOC_ROCKCHIP_MAX98090 relevant for the rock64 (RK3328)?

23:31 <diederik> on both Debian's 5.10 arm64 kernel and also one build with arm64 defconfig, /proc/asound/cards reports no sound cards and I'm trying to figure out what's needed to change/fix that

23:48 <macc24> diederik: you need simple audio card, rockchip i2s, rk3328 codec and rk3328 dw hdmi drivers

23:52 <diederik> thx. wrt the latest I do see CONFIG_ROCKCHIP_DW_HDMI=y. Do you mean that one? (not sure whether there's a specific rk3328 one)

23:53 <diederik> hmm, CONFIG_SND_SOC_RK3328 is not set in both defconfig and Debian's config ....

23:53 <diederik> then I guess it's no surprise I don't see any sound cards ;P