13:49 <loki6660> Hi, I'm trying to get an unknown panel working on a sm8550. I'm pretty sure I have the timings, init seq correct and various regulator correct, but it still doesn't display anything... I can see some dsi_err_worker: status=5 and dsi_err_worker: status=4 in the logs

13:50 <loki6660> looking at the Android DTS this panel seems to require some panel register read for ESD checking... could that be the reason why it's not working ?

13:50 <loki6660> also: the panel seems to flash for a split second during probe

13:54 <krzk> loki666: reset gpios? or their polarity? any errors from MDSS DRM (with drm.debug)?

13:54 <krzk> and which kernel...

13:57 <loki666> I think my reset-gpios are aslo correct, and I tried to swap the polarity and the reset sequence... doesn't change... I'm on 6.15.2, but tried 6.16-rc4 also

13:57 <loki666> which flag for drm.debug ?

13:57 <loki666> 0x3 ?

13:59 <loki666> this is the android dts node https://gist.github.com/loki666/2d0c299e9f537c979bec769ea78c7a10

13:59 <loki666> the only difference I see from other working panels is the qcom,esd-check-enabled; and qcom,mdss-dsi-panel-status-check-mode = "reg_read";

14:16 <sgerhold> loki666: have you used the panel driver generator?

14:24 <loki666> sgerhold: yes

14:25 <loki666> here is what I have https://gist.github.com/loki666/cd3784a82b851f2a9b15562d236b07f3

14:25 <loki666> some gpio should be exposed as regulators... but that's for when it will be working

14:26 <sgerhold> I've seen plenty of panels with ESD stuff in downstream, but not a single one needed that to be working on mainline

14:26 <sgerhold> So I doubt that's it

14:26 <loki666> so there is still hopes...

14:29 <sgerhold> There is some funkyness with display handover from the bootloader sometimes, you might need to experiment a bit with making DRM MSM a module and/or builtin and/or clk_ignore_unused

14:29 <sgerhold> I've seen all of these cause dsi errors in some situations

14:30 <loki666> I'll try that

14:35 <loki666> drm.debug=0x3 is flooding my dmesg... I can't get the top

14:36 <sgerhold> log_buf_len=?

15:08 <loki666> sgerhold: ok, what am I looking for ?

15:09 <sgerhold> I don't know, you wanted to run with drm.debug 😅

15:10 <loki666> arf... krzk asked me... here is the log https://gist.github.com/loki666/4dc2f22083dc6f0974fcd7cc27cef583

16:50 <loki666> sgerhold: with/without clk_ignore built-in or module doesn't change anything

22:13 <loki666> sgerhold: got it! the vfp was too small bumped from 8 to 18. and voila !