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

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Message-ID: <20190829142931.GZ28351@bigcity.dyn.berto.se>
Date:   Thu, 29 Aug 2019 16:29:31 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Matthew Michilot <matthew.michilot@...il.com>, lars@...afoo.de,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

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.

> 
> 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