For quite a while I had this patch in my local tree but never made it
work. Kernel generates the following messages all the time:

fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: signal not lock, tmds_clk_ratio:0
fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: mu_st:0x2, scdc_st:0x0, dma_st10:0x10

"v4l2-ctrl --all" reports that HDMI In is detected, /dev/video[0-4]
exist.

I tried two signal sources:
- AMD Radeon WX2100 (via passive DisplayPort -> HDMI adapter)
- AMD Radeon RX6700XT (HDMI port)

Same situation with both - kernel messages as above on RK3588 system, no
connected monitor on host side.

Usually I used MPlayer or MPV to check v4l2 devices but here it fails
too:

$ mpv av://v4l2:/dev/video3
[ffmpeg/demuxer] video4linux2,v4l2: Not a video capture device.
[lavf] avformat_open_input() failed
Failed to recognize file format.
Exiting... (Errors when loading file)


Checked SBC schematics again and HDMIIRX_DET_L line is GPIO1_D5 like it
my patch.

What I go wrong?

Marcin Juszkiewicz (1):
  arm64: dts: rockchip: enable HDMI Receiver on NanoPC T6

 .../boot/dts/rockchip/rk3588-nanopc-t6.dtsi     | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

-- 
2.51.0

On 9/5/25 14:02, Marcin Juszkiewicz wrote:
> For quite a while I had this patch in my local tree but never made it
> work. Kernel generates the following messages all the time:
> 
> fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: signal not lock, tmds_clk_ratio:0
> fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: mu_st:0x2, scdc_st:0x0, dma_st10:0x10
> 
> "v4l2-ctrl --all" reports that HDMI In is detected, /dev/video[0-4]
> exist.
> 
> I tried two signal sources:
> - AMD Radeon WX2100 (via passive DisplayPort -> HDMI adapter)
> - AMD Radeon RX6700XT (HDMI port)
> 
> Same situation with both - kernel messages as above on RK3588 system, no
> connected monitor on host side.
> 
> Usually I used MPlayer or MPV to check v4l2 devices but here it fails
> too:
> 
> $ mpv av://v4l2:/dev/video3
> [ffmpeg/demuxer] video4linux2,v4l2: Not a video capture device.
> [lavf] avformat_open_input() failed
> Failed to recognize file format.
> Exiting... (Errors when loading file)
> 
> 
> Checked SBC schematics again and HDMIIRX_DET_L line is GPIO1_D5 like it
> my patch.
> 
> What I go wrong?

Hi, your trouble with HDMI capture sounds very similar to [1]. Make sure
you're using opensource ATF and check whether capture works using
v4l2-ctl tool, see replies to [1]. Post a full kernel driver log if
problem will persist.

[1]
https://lore.kernel.org/linux-media/c71a3f79-71f3-4fd2-a509-c42b24636a2f@timsurber.de/

-- 
Best regards,
Dmitry

On Fri, 05 Sep 2025 13:02:29 +0200, Marcin Juszkiewicz wrote:
> For quite a while I had this patch in my local tree but never made it
> work. Kernel generates the following messages all the time:
> 
> fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: signal not lock, tmds_clk_ratio:0
> fdee0000.hdmi_receiver: hdmirx_wait_signal_lock: mu_st:0x2, scdc_st:0x0, dma_st10:0x10
> 
> "v4l2-ctrl --all" reports that HDMI In is detected, /dev/video[0-4]
> exist.
> 
> [...]

Applied, thanks!

[1/1] arm64: dts: rockchip: enable HDMI Receiver on NanoPC T6
      commit: fdab01864390db7ef0bea28804c7a3147dc0a386

Best regards,
-- 
Heiko Stuebner <heiko@sntech.de>