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SubjectRe: [PATCH v1 00/35] drm: Analog TV Improvements
Hi,

On Sun, Aug 21, 2022 at 06:33:12PM +0200, Noralf Trønnes wrote:
> Den 29.07.2022 18.34, skrev Maxime Ripard:
> > Hi,
> >
> > Here's a series aiming at improving the command line named modes support,
> > and more importantly how we deal with all the analog TV variants.
> >
> > The named modes support were initially introduced to allow to specify the
> > analog TV mode to be used.
> >
> > However, this was causing multiple issues:
> >
> > * The mode name parsed on the command line was passed directly to the
> > driver, which had to figure out which mode it was suppose to match;
> >
> > * Figuring that out wasn't really easy, since the video= argument or what
> > the userspace might not even have a name in the first place, but
> > instead could have passed a mode with the same timings;
> >
> > * The fallback to matching on the timings was mostly working as long as
> > we were supporting one 525 lines (most likely NSTC) and one 625 lines
> > (PAL), but couldn't differentiate between two modes with the same
> > timings (NTSC vs PAL-M vs NSTC-J for example);
> >
> > * There was also some overlap with the tv mode property registered by
> > drm_mode_create_tv_properties(), but named modes weren't interacting
> > with that property at all.
> >
> > * Even though that property was generic, its possible values were
> > specific to each drivers, which made some generic support difficult.
> >
> > Thus, I chose to tackle in multiple steps:
> >
> > * A new TV norm property was introduced, with generic values, each driver
> > reporting through a bitmask what standard it supports to the userspace;
> >
> > * This option was added to the command line parsing code to be able to
> > specify it on the kernel command line, and new atomic_check and reset
> > helpers were created to integrate properly into atomic KMS;
> >
> > * The named mode parsing code is now creating a proper display mode for
> > the given named mode, and the TV standard will thus be part of the
> > connector state;
> >
> > * Two drivers were converted and tested for now (vc4 and sun4i), with
> > some backward compatibility code to translate the old TV mode to the
> > new TV mode;
> >
> > Unit tests were created along the way. Nouveau, ch7006 and gud are
> > currently broken for now since I expect that work to be reworked fairly
> > significantly. I'm also not entirely sure about how to migrate GUD to the
> > new property.
> >
> > Let me know what you think,
> > Maxime
> >
>
> I don't know if it's related to this patchset or not, but I do get this:
>
> pi@pi4t:~ $ sudo dmesg -C && sudo modprobe -r vc4 && sudo modprobe vc4
> && dmesg
> [ 430.066211] Console: switching to colour dummy device 80x30
> [ 431.294788] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
> [ 431.295115] vc4-drm gpu: bound fec13000.vec (ops vc4_vec_ops [vc4])
> [ 431.295467] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
> [ 431.295804] vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops
> [vc4])
> [ 431.298895] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
> [ 441.444250] vc4-drm gpu: [drm] *ERROR* [CRTC:68:crtc-1] flip_done
> timed out
> [ 441.446529] Console: switching to colour frame buffer device 90x30
> [ 451.684321] vc4-drm gpu: [drm] *ERROR* flip_done timed out
> [ 451.684347] vc4-drm gpu: [drm] *ERROR* [CRTC:68:crtc-1] commit wait
> timed out
> [ 461.924255] vc4-drm gpu: [drm] *ERROR* flip_done timed out
> [ 461.924281] vc4-drm gpu: [drm] *ERROR* [CONNECTOR:45:Composite-1]
> commit wait timed out
> [ 472.164006] vc4-drm gpu: [drm] *ERROR* flip_done timed out
> [ 472.164031] vc4-drm gpu: [drm] *ERROR* [PLANE:61:plane-1] commit wait
> timed out
> [ 482.403877] vc4-drm gpu: [drm] *ERROR* flip_done timed out
> [ 482.403903] vc4-drm gpu: [drm] *ERROR* Timed out waiting for commit
> [ 492.643799] vc4-drm gpu: [drm] *ERROR* [CRTC:68:crtc-1] flip_done
> timed out
> [ 492.647073] vc4-drm gpu: [drm] fb0: vc4drmfb frame buffer device

Module unloading/reloading has been janky for a while.

I've fixed it up recently but it doesn't surprise me that there's still
some situation that won't work. Is it on a Pi3?

Maxime

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