Message-ID: <20220825162140.oaob4szbssf6cuvq@houat>
Date:   Thu, 25 Aug 2022 18:21:40 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Noralf Trønnes <noralf@...nnes.org>
Cc:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v1 00/35] drm: Analog TV Improvements

On Mon, Aug 22, 2022 at 03:21:29PM +0200, Noralf Trønnes wrote:
> 
> 
> Den 22.08.2022 09.48, skrev Maxime Ripard:
> > 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@...t:~ $ 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?
> > 
> 
> It's a Pi4.

With which kernel? I just tested it on last next and it seems to work ok
there. I've fixed it recently though, so it's only in drm-misc-next and
linux-next at the moment.

Maxime

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