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Subject: Re: IMX6 ADV7180 no /dev/media
To: Tim Harvey <tharvey@gateworks.com>,
        linux-media <linux-media@vger.kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>
Cc: Stephan Bauroth <der_steffi@gmx.de>
References: <CAJ+vNU3DPFEc6YnEfcYAv1=beJ96W5PSt=eBfoxCXqKnbNqfMg@mail.gmail.com>
From: Steve Longerbeam <slongerbeam@gmail.com>
Message-ID: <67ab090e-955d-9399-e182-cca049a66f1a@gmail.com>
Date: Fri, 15 Sep 2017 15:26:43 -0700
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Hi Tim,

On 09/15/2017 02:26 PM, Tim Harvey wrote:
> Greetings,
>
> I'm testing Linux master built with imx_v6_v7_defconfig on a GW51xx 
> which has an ADV7180 analog video decoder and am not seeing the imx6 
> /dev/media node get created:
>
> [    0.000000] OF: fdt: Machine model: Gateworks Ventana i.MX6 
> Dual/Quad GW51XX
> ...
> [    6.089039] imx-media: Registered subdev ipu1_vdic
> [    6.094505] imx-media: Registered subdev ipu2_vdic
> [    6.099851] imx-media: Registered subdev ipu1_ic_prp
> [    6.105074] imx-media: Registered subdev ipu1_ic_prpenc
> [    6.111346] ipu1_ic_prpenc: Registered ipu1_ic_prpenc capture as 
> /dev/video0
> [    6.119007] imx-media: Registered subdev ipu1_ic_prpvf
> [    6.124733] ipu1_ic_prpvf: Registered ipu1_ic_prpvf capture as 
> /dev/video1
> [    6.131867] imx-media: Registered subdev ipu2_ic_prp
> [    6.137125] imx-media: Registered subdev ipu2_ic_prpenc
> [    6.142921] ipu2_ic_prpenc: Registered ipu2_ic_prpenc capture as 
> /dev/video2
> [    6.150226] imx-media: Registered subdev ipu2_ic_prpvf
> [    6.155934] ipu2_ic_prpvf: Registered ipu2_ic_prpvf capture as 
> /dev/video3
> [    6.164011] imx-media: Registered subdev ipu1_csi0
> [    6.169768] ipu1_csi0: Registered ipu1_csi0 capture as /dev/video4
> [    6.176281] imx-media: Registered subdev ipu1_csi1
> [    6.181681] ipu1_csi1: Registered ipu1_csi1 capture as /dev/video5
> [    6.188189] imx-media: Registered subdev ipu2_csi0
> [    6.193680] ipu2_csi0: Registered ipu2_csi0 capture as /dev/video6
> [    6.200108] imx-media: Registered subdev ipu2_csi1
> [    6.205577] ipu2_csi1: Registered ipu2_csi1 capture as /dev/video7
> ...
> [   96.981117] adv7180 2-0020: chip found @ 0x20 (21a8000.i2c)
> [   97.019674] imx-media: Registered subdev adv7180 2-0020
> [   97.019712] imx-media capture-subsystem: Entity type for entity 
> adv7180 2-0020 was not initialized!
>
> I suspect the failure of the adv7180 is causing the issue. Steve 
> mentioned some time ago that this was an error that needed to be fixed 
> upstream but I'm not clear if that is still the case.
>

That does need fixing but is not the cause.

> I haven't looked at IMX media drivers since they were accepted to 
> mainline a few months back. Perhaps I'm simply forgetting to enable 
> something in the kernel that imx_v6_v7_defconfig doesn't turn on?

Yes, it looks like you are missing the video-mux. Enable CONFIG_VIDEO_MUX
and CONFIG_MUX_MMIO.

Steve