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 ?
> 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?
