#linux-amlogic on 2020-11-05 — irc logs at freenode.irclog.whitequark.org

2018-08-07 06:55 narmstrong changed the topic of #linux-amlogic to: Amlogic mainline kernel development discussion - our wiki http://linux-meson.com/ - ml linux-amlogic@lists.infradead.org - Publicly Logged on https://irclog.whitequark.org/linux-amlogic

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01:34 <chewitt> jbrunet: I'm not really able to bisect the aiu issue, but I was able to go backwards to 5.8-rc6 and saw this in dmesg https://pastebin.com/raw/8ud9hp3N

01:55 <chewitt> I'm now working backwards with LePotato .. I see the same ^ error on 5.8.0

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02:03 <chewitt> from LePotato .. https://pastebin.com/raw/0F0N8Ayy

02:03 <chewitt> first paste above is from a GXM device (WeTek Core2)

02:11 <chewitt> in both cases there are no patches applied to the kernel, i.e. none of my usual patchset

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06:29 <chewitt> jbrunet found this in google http://lists.infradead.org/pipermail/linux-amlogic/2020-July/007558.html

06:36 <chewitt> also https://patchwork.kernel.org/project/linux-amlogic/patch/20200731120603.2243261-1-jbrunet@baylibre.com/

06:37 <chewitt> I also have CONFIG_LOCKDEP_SUPPORT=y active, as I've been trying to capture output on the mmc lockup issue on beelink boxes

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15:18 <asdf28> has anyone had any luck getting the proprietary mali driver and blob to work on an S905 box and a mainline kernel?

15:23 <narmstrong> asdf28: yes, but you should use Lima instead now since it's usable now

15:26 <asdf28> thanks, i have tried it and i like it

15:26 <asdf28> the problem is, it makes the system crash from time to time

15:27 <asdf28> and i can't get opengl 3d to work with it, it glitches out

15:27 <asdf28> the mali driver doesn't crash but it's extremely slow for some reason

15:27 <narmstrong> this is unfortunate

15:28 <asdf28> the 2d stuff works great at least

15:30 <asdf28> i'm just asking if anyone got it to work i'd be interested, just to see how it might perform in comparison

15:31 <asdf28> i have tried compiling the old mali driver from the 3.14 kernel for a recent kernel, but it's extremely difficult because there is so much platform specific code wired into it

15:32 <asdf28> narmstrong if you got mali to work, what was the driver and blob variant that you uses if i may ask?

15:32 <asdf28> used*

15:48 <narmstrong> asdf28: https://github.com/superna9999/meson_gx_mali_450

15:49 <narmstrong> For the blob, the X11 works very badly, fbdev with a specific kernel config but gbm works fine

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15:50 <narmstrong> https://github.com/superna9999/amlogic-meson-mali/tree/buildroot-openlinux-20180502-fixup/lib/arm64

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17:18 <asdf28> thanks!

17:22 <asdf28> wow, that's a lot of blobs

17:22 <asdf28> do you know which one of these supports gbm? it doesn't say in the file name as far as i can see

17:24 <asdf28> i had no luck getting a fbdev blob to work so far

17:24 <asdf28> they all crashed with a message EGL_BAD_ALLOC

17:25 <asdf28> x11 worked but as you said, very slowly

17:25 <asdf28> wayland i have not tried yet, maybe it is worth a shot

17:35 <asdf28> may i ask what was the kernel config option that you used to get fbdev to work?

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18:02 <narmstrong> asdf28: fbdev needs special tweaks in sdl2 to work because the fbdev gl extension is non standard

18:03 <narmstrong> CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM will make it work

18:21 <asdf28> oh

18:21 <asdf28> thanks, noted

18:25 <asdf28> AddressSanitizer: heap-use-after-free on address 0xffff98403e98 at pc 0x00000091dc64 bp 0xffff98dfdee0 sp 0xffff98dfdef8

18:25 <asdf28> this is one message i got using fbdev

18:25 <asdf28> i will now recompile my kernel with that option

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19:28 <narmstrong> asdf28: you’ll also need the drm_leak_fbdev_smem drm module param

19:28 <narmstrong> https://github.com/torvalds/linux/blob/4ef8451b332662d004df269d4cdeb7d9f31419b5/drivers/gpu/drm/drm_fb_helper.c#L77

19:28 <narmstrong> And set fbdev overalloc to 300

19:28 <narmstrong> https://github.com/torvalds/linux/blob/4ef8451b332662d004df269d4cdeb7d9f31419b5/drivers/gpu/drm/Kconfig#L125

19:46 <asdf28> thanks

19:50 <asdf28> how do you set this module parameter? i found a forum post that adds "drm_leak_fbdev_smem=1" to the kernel command line

19:52 <asdf28> but on kernel.org it says "via the kernel command line with a module name prefix" such as "usbcore.blinkenlights=1"

19:53 <asdf28> so "drm_fb_helper.drm_leak_fbdev_smem=1" ?

20:12 <asdf28> never mind, i found it

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20:13 <asdf28> drm_kms_helper.drm_fbdev_overalloc=100 drm_kms_helper.drm_leak_fbdev_smem=1

20:13 <asdf28> it did not solve the crash but i'll try another fbdev blob

20:13 <asdf28> what's interesting is that setting the overalloc to 300 gives me a black screen

20:13 <asdf28> 200 works

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22:11 <asdf28> still couldn't get it to work, eglInitialize failed

22:13 <asdf28> anyway, thanks a lot for your help so far, i appreciate it

22:14 <asdf28> i'll test the same driver and blob on another board tomorrow

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