linux-kernel - Re: [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

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Message-ID: <CAJ+vNU11HTcP8L5J2Xg+Rmhvb8JDYemhJxt-GaGG5Myk3n38Tw@mail.gmail.com>
Date:   Mon, 23 Sep 2019 15:04:47 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Niklas Söderlund <niklas.soderlund@...natech.se>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Matthew Michilot <matthew.michilot@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

On Thu, Aug 29, 2019 at 7:29 AM Niklas Söderlund
<niklas.soderlund@...natech.se> wrote:
>
> Hi,
>
> On 2019-08-29 13:43:49 +0200, Hans Verkuil wrote:
> > Adding Niklas.
> >
> > Niklas, can you take a look at this?
>
> I'm happy to have a look at this. I'm currently moving so all my boards
> are in a box somewhere. I hope to have my lab up and running next week,
> so if this is not urgent I will look at it then.
>

Niklas,

Have you looked at this yet? Without this patch the ADV7280A does not
output proper BT.656. We tested this on a Gateworks Ventana GW5404-G
which uses the ADV7280A connected to the IMX6 CSI parallel bus. I'm
hoping to see this get merged and perhaps backported to older kernels.

Regards,

Tim

> >
> > Regards,
> >
> >       Hans
> >
> > On 8/27/19 11:55 PM, Matthew Michilot wrote:
> > > From: Matthew Michilot <matthew.michilot@...il.com>
> > >
> > > Captured video would be out of sync when using the adv7280 with
> > > the BT.656-4 protocol. Certain registers (0x04, 0x31, 0xE6) had to
> > > be configured properly to ensure BT.656-4 compatibility.
> > >
> > > An error in the adv7280 reference manual suggested that EAV/SAV mode
> > > was enabled by default, however upon inspecting register 0x31, it was
> > > determined to be disabled by default.
> > >
> > > Signed-off-by: Matthew Michilot <matthew.michilot@...il.com>
> > > Reviewed-by: Tim Harvey <tharvey@...eworks.com>
> > > ---
> > >  drivers/media/i2c/adv7180.c | 15 +++++++++++++--
> > >  1 file changed, 13 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
> > > index 99697baad2ea..27da424dce76 100644
> > > --- a/drivers/media/i2c/adv7180.c
> > > +++ b/drivers/media/i2c/adv7180.c
> > > @@ -94,6 +94,7 @@
> > >  #define ADV7180_REG_SHAP_FILTER_CTL_1      0x0017
> > >  #define ADV7180_REG_CTRL_2         0x001d
> > >  #define ADV7180_REG_VSYNC_FIELD_CTL_1      0x0031
> > > +#define ADV7180_VSYNC_FIELD_CTL_1_NEWAV 0x12
> > >  #define ADV7180_REG_MANUAL_WIN_CTL_1       0x003d
> > >  #define ADV7180_REG_MANUAL_WIN_CTL_2       0x003e
> > >  #define ADV7180_REG_MANUAL_WIN_CTL_3       0x003f
> > > @@ -935,10 +936,20 @@ static int adv7182_init(struct adv7180_state *state)
> > >             adv7180_write(state, ADV7180_REG_EXTENDED_OUTPUT_CONTROL, 0x57);
> > >             adv7180_write(state, ADV7180_REG_CTRL_2, 0xc0);
> > >     } else {
> > > -           if (state->chip_info->flags & ADV7180_FLAG_V2)
> > > +           if (state->chip_info->flags & ADV7180_FLAG_V2) {
> > > +                   /* ITU-R BT.656-4 compatible */
> > >                     adv7180_write(state,
> > >                                   ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
> > > -                                 0x17);
> > > +                                 ADV7180_EXTENDED_OUTPUT_CONTROL_NTSCDIS);
> > > +                   /* Manually set NEWAVMODE */
> > > +                   adv7180_write(state,
> > > +                                 ADV7180_REG_VSYNC_FIELD_CTL_1,
> > > +                                 ADV7180_VSYNC_FIELD_CTL_1_NEWAV);
> > > +                   /* Manually set V bit end position in NTSC mode */
> > > +                   adv7180_write(state,
> > > +                                 ADV7180_REG_NTSC_V_BIT_END,
> > > +                                 ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
> > > +           }
> > >             else
> > >                     adv7180_write(state,
> > >                                   ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
> > >
> >
>
> --
> Regards,
> Niklas Söderlund