Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Mateusz Kwiatkowski <kfyatek@gmail.com>
Message-ID: <9a15b1cf-692c-1b0d-02a6-316cbd954525@gmail.com>
Date:   Mon, 22 Aug 2022 10:57:26 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.11.0
Subject: Re: [PATCH v1 00/35] drm: Analog TV Improvements
Content-Language: en-US
To:     Maxime Ripard <maxime@cerno.tech>,
        =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
Cc:     Jernej Skrabec <jernej.skrabec@gmail.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Chen-Yu Tsai <wens@csie.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Samuel Holland <samuel@sholland.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Daniel Vetter <daniel@ffwll.ch>, Emma Anholt <emma@anholt.net>,
        David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
        Phil Elwell <phil@raspberrypi.com>,
        linux-arm-kernel@lists.infradead.org,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        linux-amlogic@lists.infradead.org, dri-devel@lists.freedesktop.org,
        Dom Cobley <dom@raspberrypi.com>
References: <20220728-rpi-analog-tv-properties-v1-0-3d53ae722097@cerno.tech>
 <987d6114-5fcb-d668-3b0d-ad6d8723dfdb@tronnes.org>
 <20220822074800.qzyctchqn5usr55g@houat>
In-Reply-To: <20220822074800.qzyctchqn5usr55g@houat>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi Maxime,

I tried testing and reviewing your changes properly over the last weekend, but
ultimately ran into this ("flip_done timed out" etc.) issue and was unable to
mitigate it, at least so far. This seems to pop up every time I try to change
modes in any way (either change the TV norm, or just try doing
"xrandr --output Composite-1 --off" followed by bringing it back on; it also
means that the Pi goes unusable when the DE's screen saving routine kicks in).

I'm using a Pi 4, and it works with the rpi-5.13.y branch
https://github.com/raspberrypi/linux, but seemingly nothing newer.
I specifically tried rpi-5.14.y, rpi-5.15.y and rpi-5.19.y - rpi-5.15.y,
which is the current main branch in Raspberry Pi OS, seems to be broken since
forever; at least since my patches (originally written for 5.10) landed there.

I'll try identifying the issue further, possibly later today, and maybe check
the rpi-6.0.y branch as well.

Best regards,
Mateusz Kwiatkowski

W dniu 22.08.2022 o 09:48, Maxime Ripard pisze:
> 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