linux-kernel - Re: [PATCH v4 0/4] Add Synopsys DesignWare HDMI RX Controller

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Message-ID: <929d2f50-6b0e-4d1e-a6d3-482d615bd06a@collabora.com>
Date: Tue, 6 Aug 2024 14:58:08 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Tim Surber <me@...surber.de>, Shreeya Patel
 <shreeya.patel@...labora.com>, heiko@...ech.de, mchehab@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 mturquette@...libre.com, sboyd@...nel.org, p.zabel@...gutronix.de,
 jose.abreu@...opsys.com, nelson.costa@...opsys.com,
 shawn.wen@...k-chips.com, nicolas.dufresne@...labora.com,
 hverkuil@...all.nl, hverkuil-cisco@...all.nl
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 0/4] Add Synopsys DesignWare HDMI RX Controller

On 8/4/24 02:57, Tim Surber wrote:
> Hi Shreeya,
> 
> I tested your patch and noticed problems when using 3840x2160 resolution
> at  60fps.
> 
> For my testing I connected an HDMI source and set it to 4k60fps. I
> verified that this source and the cables work on a screen at this
> resolution.
> 
> Using
> 'v4l2-ctl --verbose -d /dev/video1
> --set-fmt-video=width=3840,height=2160,pixelformat='NV12'
> --stream-mmap=4 --stream-skip=3 --stream-count=100 --stream-poll'
> I get the video format output, but not the periodic output which shows
> the fps.
> 
> Using
> 'GST_DEBUG=4 gst-launch-1.0 -v v4l2src device=/dev/video1 !
> fpsdisplaysink text-overlay=false video-sink="fakevideosink"'
> I get the following error message:
> 
> (gst-launch-1.0:3231): GStreamer-CRITICAL **: 01:34:39.137:
> gst_memory_resize: assertion 'size + mem->offset + offset <=
> mem->maxsize' failed
> 0:00:03.489382529  3231 0xffffa0000b90 WARN  v4l2bufferpool
> gstv4l2bufferpool.c:2209:gst_v4l2_buffer_pool_process:<v4l2src0:pool0:src> Dropping truncated buffer, this is likely a driver bug.
> 0:00:03.489421906  3231 0xffffa0000b90 WARN  bufferpool
> gstbufferpool.c:1252:default_reset_buffer:<v4l2src0:pool0:src> Buffer
> 0xffff98008e80 without the memory tag has maxsize (8294400) that is
> smaller than the configured buffer pool size (12441600). The buffer will
> be not be reused. This is most likely a bug in this GstBufferPool subclass
> 
> 
> Everything works with 4k30fps or 1080p 60fps. The hardware should
> support 4k60fps.

Please do `echo 3 > /sys/module/synopsys_hdmirx/parameters/debug` and
show the kernel log of capturing 4k@60 with v4l2-ctl.

-- 
Best regards,
Dmitry