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

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Date:   Thu, 29 Aug 2019 13:43:49 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Matthew Michilot <matthew.michilot@...il.com>, lars@...afoo.de
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Niklas Söderlund <niklas.soderlund@...natech.se>
Subject: Re: [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

Adding Niklas.

Niklas, can you take a look at this?

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,
>