linux-kernel - Re: [PATCH v1 00/35] drm: Analog TV Improvements

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Message-ID: <20220822074800.qzyctchqn5usr55g@houat>
Date:   Mon, 22 Aug 2022 09:48:00 +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

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?

Maxime