Re: [PATCH v2 5/6] media: adv748x: Store the TX sink in HDMI/AFE

[Kieran Bingham <kieran.bingham@ideasonboard.com>]

Hi Jacopo,

On 06/01/2019 15:54, Jacopo Mondi wrote:
> Both the AFE and HDMI s_stream routines (adv748x_afe_s_stream() and
> adv748x_hdmi_s_stream()) have to enable the CSI-2 TX they are streaming video
> data to.
> 
> With the introduction of dynamic routing between HDMI and AFE entities to
> TXA, the video stream sink needs to be set at run time, and not statically
> selected as the s_stream functions are currently doing.
> 
> To fix this, store a reference to the active CSI-2 TX sink for both HDMI and
> AFE sources, and operate on it when starting/stopping the stream.
> 

Great - decouples the AFE/HDMI from a specific TX.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/media/i2c/adv748x/adv748x-afe.c  |  2 +-
>  drivers/media/i2c/adv748x/adv748x-csi2.c | 15 +++++++++++++--
>  drivers/media/i2c/adv748x/adv748x-hdmi.c |  2 +-
>  drivers/media/i2c/adv748x/adv748x.h      |  4 ++++
>  4 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x-afe.c b/drivers/media/i2c/adv748x/adv748x-afe.c
> index 71714634efb0..dbbb1e4d6363 100644
> --- a/drivers/media/i2c/adv748x/adv748x-afe.c
> +++ b/drivers/media/i2c/adv748x/adv748x-afe.c
> @@ -282,7 +282,7 @@ static int adv748x_afe_s_stream(struct v4l2_subdev *sd, int enable)
>  			goto unlock;
>  	}
>  
> -	ret = adv748x_tx_power(&state->txb, enable);
> +	ret = adv748x_tx_power(afe->tx, enable);
>  	if (ret)
>  		goto unlock;
>  
> diff --git a/drivers/media/i2c/adv748x/adv748x-csi2.c b/drivers/media/i2c/adv748x/adv748x-csi2.c
> index de3944615e64..c835f6379337 100644
> --- a/drivers/media/i2c/adv748x/adv748x-csi2.c
> +++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
> @@ -88,14 +88,25 @@ static int adv748x_csi2_registered(struct v4l2_subdev *sd)
>  						 is_txb(tx));
>  		if (ret)
>  			return ret;
> +
> +		/* TXB can output AFE signals only. */
> +		if (is_txb(tx))
> +			state->afe.tx = tx;
>  	}
>  
>  	/* Register link to HDMI for TXA only. */
>  	if (is_txb(tx) || !is_hdmi_enabled(state))
>  		return 0;
>  
> -	return adv748x_csi2_register_link(tx, sd->v4l2_dev, &state->hdmi.sd,
> -					  ADV748X_HDMI_SOURCE, true);
> +	ret = adv748x_csi2_register_link(tx, sd->v4l2_dev, &state->hdmi.sd,
> +					 ADV748X_HDMI_SOURCE, true);
> +	if (ret)
> +		return ret;
> +
> +	/* The default HDMI output is TXA. */
> +	state->hdmi.tx = tx;
> +
> +	return 0;
>  }
>  
>  static const struct v4l2_subdev_internal_ops adv748x_csi2_internal_ops = {
> diff --git a/drivers/media/i2c/adv748x/adv748x-hdmi.c b/drivers/media/i2c/adv748x/adv748x-hdmi.c
> index 35d027941482..c557f8fdf11a 100644
> --- a/drivers/media/i2c/adv748x/adv748x-hdmi.c
> +++ b/drivers/media/i2c/adv748x/adv748x-hdmi.c
> @@ -358,7 +358,7 @@ static int adv748x_hdmi_s_stream(struct v4l2_subdev *sd, int enable)
>  
>  	mutex_lock(&state->mutex);
>  
> -	ret = adv748x_tx_power(&state->txa, enable);
> +	ret = adv748x_tx_power(hdmi->tx, enable);
>  	if (ret)
>  		goto done;
>  
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index d8d94053301b..6eb2e4a95eed 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -122,6 +122,8 @@ struct adv748x_hdmi {
>  	struct v4l2_dv_timings timings;
>  	struct v4l2_fract aspect_ratio;
>  
> +	struct adv748x_csi2 *tx;
> +
>  	struct {
>  		u8 edid[512];
>  		u32 present;
> @@ -152,6 +154,8 @@ struct adv748x_afe {
>  	struct v4l2_subdev sd;
>  	struct v4l2_mbus_framefmt format;
>  
> +	struct adv748x_csi2 *tx;
> +
>  	bool streaming;
>  	v4l2_std_id curr_norm;
>  	unsigned int input;
> 

-- 
Regards
--
Kieran