Dave Stevenson schreef op 2023-03-09 13:59:
On Wed, 8 Mar 2023 at 22:46, AL13N <alien@xxxxxxxx> wrote:
AL13N schreef op 2023-03-08 22:16:
> Maxime Ripard schreef op 2023-03-08 13:35:
>> Hi,
>>
>> On Tue, Mar 07, 2023 at 05:10:16PM +0000, Dave Stevenson wrote:
>>> On Tue, 7 Mar 2023 at 16:25, AL13N <alien@xxxxxxxx> wrote:
>>> > AL13N schreef op 2023-03-06 17:34:
>>> > > I have a RPI4B connected on 2nd HDMI port (furthest away from power)
>>> > > to a 4K TV, which works until 5.16, from 5.17 there is no X (or
>>> > > plymouth), the cause of no X is that EDID gives nothing, and in the
>>> > > journal; there is "Cannot find any crct or sizes". Only the kernel is
>>> > > changed for this.
>>> > >
>>> > > In 5.16 instead of this message there is a bunch of hex lines prefixed
>>> > > with BAD.
>>> > >
>>> > > It is still broken in 6.1 at the very least.
>>> > >
>>> > > I donno if this is related to this part, but I wanted to try a newer
>>> > > kernel, because the RPI4 seems to do all the video decoding in
>>> > > software and cannot seem to handle it.
>>> > >
>>> > >
>>> > > logs:
>>> > > vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
>>> > > vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
>>> > > vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > > vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > > vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > > vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > > vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > > checking generic (3ea81000 12c000) vs hw (0 ffffffffffffffff)
>>> > > fb0: switching to vc4 from simple
>>> > > Console: switching to colour dummy device 80x25
>>> > > [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
>>> > > vc4-drm gpu: [drm] Cannot find any crtc or sizes
>>> >
>>> > 5.16 log has:
>>> >
>>> > vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
>>> > vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
>>> > vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
>>> > [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
>>> > [00] BAD 00 ff ff ff ff ff ff 00 36 74 00 00 00 00 00 00
>>> > [00] BAD 0b 1f 01 03 00 23 01 78 0a cf 74 a3 57 4c b0 23
>>> > [00] BAD 09 48 4c 00 00 00 01 01 01 ff 01 ff ff 01 01 01
>>> > [00] BAD 01 01 01 01 01 20 08 e8 00 30 f2 70 5a 80 b0 58
>>> > [00] BAD 8a 00 c4 8e 21 00 00 1e 02 3a 80 18 71 38 2d 40
>>> > [00] BAD 58 2c 45 00 c4 8e 21 00 00 1e 00 00 00 fc 00 53
>>> > [00] BAD 41 4c 4f 52 41 0a 20 20 20 20 20 20 00 00 00 fd
>>> > [00] BAD 00 3b 46 1f 8c 3c 00 0a 20 20 20 20 20 20 01 aa
>>> > Console: switching to colour frame buffer device 240x67
>>> > vc4-drm gpu: [drm] fb0: vc4drmfb frame buffer device
>>> >
>>> >
>>> > i donno what this bad is, but it doesn't happen in 5.17... maybe these
>>> > BAD got filtered out, but they did end up working for me? or something?
>>> > i donno...
>>>
>>> Run it through edid-decode - the checksum is wrong.
>>>
>>> Block 0, Base EDID:
>>> EDID Structure Version & Revision: 1.3
>>> Vendor & Product Identification:
>>> Manufacturer: MST
>>> Model: 0
>>> Made in: week 11 of 2021
>>> Basic Display Parameters & Features:
>>> Analog display
>>> Input voltage level: 0.7/0.3 V
>>> Blank level equals black level
>>> Maximum image size: 35 cm x 1 cm
>>> Gamma: 2.20
>>> RGB color display
>>> First detailed timing is the preferred timing
>>> Color Characteristics:
>>> Red : 0.6396, 0.3398
>>> Green: 0.2998, 0.6904
>>> Blue : 0.1376, 0.0380
>>> White: 0.2822, 0.2968
>>> Established Timings I & II: none
>>> Standard Timings:
>>> GTF : 2288x1432 61.000 Hz 16:10 90.463 kHz 282.245 MHz
>>> Detailed Timing Descriptors:
>>> DTD 1: 3840x2160 60.000 Hz 16:9 135.000 kHz 594.000 MHz
>>> (708
>>> mm x 398 mm)
>>> Hfront 176 Hsync 88 Hback 296 Hpol P
>>> Vfront 8 Vsync 10 Vback 72 Vpol P
>>> DTD 2: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
>>> (708
>>> mm x 398 mm)
>>> Hfront 88 Hsync 44 Hback 148 Hpol P
>>> Vfront 4 Vsync 5 Vback 36 Vpol P
>>> Display Product Name: 'SALORA'
>>> Display Range Limits:
>>> Monitor ranges (GTF): 59-70 Hz V, 31-140 kHz H, max dotclock 600
>>> MHz
>>> Extension blocks: 1
>>> Checksum: 0xaa (should be 0xeb)
>>>
>>> Weird that it also says that it's an analog display when it's
>>> connected over HDMI. Something rather bizarre there, and I think
>>> it'll
>>> hit problems in drm_edid at [1] as we end up with a connector having
>>> no color_formats defined. I was discussing this with Maxime only last
>>> week, but in relation to VGA monitors connected through HDMI to VGA
>>> adapters without rewriting the EDID.
>>>
>>> If you have an issue between 5.16 and 5.17, then I'd guess at [2] and
>>> your monitor not asserting hotplug correctly. The raw hotplug status
>>> is reported in /sys/kernel/debug/dri/N/hdmi0_regs (N will be either 0
>>> or 1 depending on the probe order of the vc4 and v3d drivers). Grep
>>> for HDMI_HOTPLUG.
>>
>> If it's an option, bisecting between 5.16 and 5.17 which commit
>> introduced the regression would be nice.
>>
>>> Incorrect hotplug behaviour causes grief when combined with HDMI2.0
>>> and scrambling. If you don' t know the other end has been
>>> disconnected, then you never know that scrambling needs to be
>>> re-negotiated over SCDC, and the display will typically end up just
>>> being blank.
>>>
>>> [1]
>>> https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_edid.c#L6460
>>> [2]
>>> https://github.com/torvalds/linux/commit/cc5f1cbbc1e12ad5b11d594159fe793eb03c70fa
>>
>> We can easily test that: could you try booting with video=HDMI-A-1:D
>> (or
>> HDMI-A-2, depending on whether you use HDMI0 or HDMI1) and see if it
>> helps?
>
> in kernel 6.1 or kernel 5.17 ?
in 6.1 at least i booted with video=HDMI-A-2:D (i'm plugged into the
hdmi farthest from the power)
and I did see BAD stuff here too:
[drm] Initialized v3d 1.0.0 20180419 for fec00000.v3d on minor 0
vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
Registered IR keymap rc-cec
rc rc0: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0
input: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input0
vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
[drm] forcing HDMI-A-2 connector on
Registered IR keymap rc-cec
rc rc1: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1
input: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1/input1
vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
[drm] Initialized vc4 0.0.0 20140616 for gpu on minor 1
EDID block 0 (tag 0x00) checksum is invalid, remainder is 235
[00] BAD 00 ff ff ff ff ff ff 00 36 74 00 00 00 00 00 00
[00] BAD 0b 1f 01 03 00 23 01 78 0a cf 74 a3 57 4c b0 23
[00] BAD 09 48 4c 00 00 00 01 01 01 ff 01 ff ff 01 01 01
[00] BAD 01 01 01 01 01 20 08 e8 00 30 f2 70 5a 80 b0 58
[00] BAD 8a 00 c4 8e 21 00 00 1e 02 3a 80 18 71 38 2d 40
[00] BAD 58 2c 45 00 c4 8e 21 00 00 1e 00 00 00 fc 00 53
[00] BAD 41 4c 4f 52 41 0a 20 20 20 20 20 20 00 00 00 fd
[00] BAD 00 3b 46 1f 8c 3c 00 0a 20 20 20 20 20 20 01 aa
vc4-drm gpu: [drm] Cannot find any crtc or sizes
EDID block 0 (tag 0x00) checksum is invalid, remainder is 125
vc4-drm gpu: [drm] Cannot find any crtc or sizes
a bit puzzling why it does EDID block twice and it's twice checksum
invalid?
I also see forcing connector on.
earlier, i did try to make an edid file from a modeline that worked on
5.16 and pass it using drm_kms_helper.edid_firmware= ; but that didn't
work, there only was some kind of warning that i should use something
else...
It always helps to actually quote warnings or errors.
Almost certainly "drm_kms_helper.edid_firmware is deprecated, please
use drm.edid_firmware instead.", in which case do as it tells you and
use "drm.edid_firmware=<filename>".
oh, i interpreted this as "it works for now, but will be removed later"
? are you saying it really doesn't work and i should retest with
"drm.edid_firmware=" ?
reading through all your messages, does this mean, that i should be
able
to boot if we were to "fix" this edid file? and pass it? or is this
something that needs change in kernel?
At present you have 2 issues
- the monitor or cable doesn't handle the hotplug line correctly
- the monitor doesn't provide a valid EDID.
The first you can workaround with "video=HDMI-A-2:D".
I thought the video= had to be turned off for drm.edid_firmware= to work
well?
rpi4 config.txt has a disable_fw_kms_setup=1 that disables the video
tags that are auto-added to cmdline (this option is commented atm)
there is also a hdmi_force_hotplug=1 option that is turned on atm
The second you can work around by capturing the EDID, fixing it, and
then using "drm.edid_firmware=<filename>".
The first fix is to just fixup the checksum (edid-decode even tells
you the correct value as 0xEB). That doesn't solve the fact that the
EDID contains other rubbish like being an analog display which may
cause further issues. The simplest fix for reporting as an analog
display is to change byte 20 from 0x00 to 0x80, and then correct the
checksum again.
The EDID advertises 4k60, 1080p60, and GTF 2288x1432 @ 61Hz.
In order to support 4k60 it needs to support HDMI2.0 and enabling
scrambling via SCDC. That should also be signalled in the EDID Sink
Capability Data Structure block but isn't, so 4k60 support may be
compromised.
the rpi4 also has in config.txt a hdmi_enable_4kp60=1, which i have not
turned on atm; i don't know if that has any impact here...
Sorry, all of this comes back to the monitor vendor shipping rubbish.
None of this is the fault of the vc4 driver, and it only worked under
5.16 by chance.
do the config.txt directives on the rpi4 have any impact here? I always
figured these options only changed the cmdline video= parameters, it
can't really have any impact to the edid, no?
also, i assume there's lots of monitors/TVs that have rubbish EDID
files, how is this generally handled: are you guys trying to cater to
these weird EDID's or is it like: "nope, bad EDID, they should fix it,
no screen for now"?
>
>>> > I also noticed that earlier in the logs there are more bound lines:
>>> > (some are double)
>>> >
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> >
>>> > and then here for some reason systemd does modprobe@drm.service ? is
>>> > this just a delayed starting log line, or does it actually try to unload
>>> > drm and reload? i doubt it?
>>> > in any case there is more that appears before:
>>> >
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> > vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
>>> > vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
>>> > vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
>>> >
>>> >
>>> > so, the error message is weird, as it implies 2 possibilities. however,
>>> > i think it did find a crtc since all those pixelvalve things use crtc
>>> > functions?
>>> >
>>> > So then why do i have this problem on my RPI4? do most people just use
>>> > the raspberry pi kernels?
>>>
>>> Largely, yes, people use our vendor kernels.
>>
>> tbf, the downstream kernel has pretty much the same code here, so the
>> issue is very likely to affect it too.
>>
>> I would just assume that your TV has some unusual behaviour that
>> throws
>> the driver off, and most people won't.
>
> IC, the TV also has an option somewhere to choose EDID 2.0, i thought
> i chose that but if that decode says 1.3, maybe i didn't... Is it
> worth it to retry this?
actually, the TV was set to EDID 2.0 the other option was 1.4 (?)
I would guess that the HDMI 1.4 setting drops the 4k60 mode as HDMI1.4
maxes out at 4k30. It's impossible for us to say if it fixes any of
the other issues with the EDID.
So, the edid needs to be changed to:
- not be analog
- set to 2.0
- add scrambling capability on SCDC
- fix checksum
I'm wondering if the config.txt actually changes these values without
fixing checksum and that is the cause? but that seems very unlikely...
thanks a lot for the responses, maybe I should just try to fix the EDID
and then just supply it to the company in question, I was in contact
with them asking for the EDID file earlier (to see if they have an
updated file someplace).
