Re: [PATCH v3 6/6] media: adv748x: Implement TX link_setup callback

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

Hi Jacopo,

Thank you for the update,

On 10/01/2019 14:02, Jacopo Mondi wrote:
> When the adv748x driver is informed about a link being created from HDMI or
> AFE to a CSI-2 TX output, the 'link_setup()' callback is invoked. Make
> sure to implement proper routing management at link setup time, to route
> the selected video stream to the desired TX output.

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

> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/media/i2c/adv748x/adv748x-core.c | 48 +++++++++++++++++++++++-
>  drivers/media/i2c/adv748x/adv748x.h      |  2 +
>  2 files changed, 49 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
> index 200e00f93546..ea7e5ca48f1a 100644
> --- a/drivers/media/i2c/adv748x/adv748x-core.c
> +++ b/drivers/media/i2c/adv748x/adv748x-core.c
> @@ -335,6 +335,51 @@ int adv748x_tx_power(struct adv748x_csi2 *tx, bool on)
>  /* -----------------------------------------------------------------------------
>   * Media Operations
>   */
> +static int adv748x_link_setup(struct media_entity *entity,
> +			      const struct media_pad *local,
> +			      const struct media_pad *remote, u32 flags)
> +{
> +	struct v4l2_subdev *rsd = media_entity_to_v4l2_subdev(remote->entity);
> +	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
> +	struct adv748x_state *state = v4l2_get_subdevdata(sd);
> +	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
> +	bool enable = flags & MEDIA_LNK_FL_ENABLED;
> +	u8 io10_mask = ADV748X_IO_10_CSI1_EN |
> +		       ADV748X_IO_10_CSI4_EN |
> +		       ADV748X_IO_10_CSI4_IN_SEL_AFE;
> +	u8 io10 = 0;
> +
> +	/* Refuse to enable multiple links to the same TX at the same time. */
> +	if (enable && tx->src)
> +		return -EINVAL;
> +
> +	/* Set or clear the source (HDMI or AFE) and the current TX. */
> +	if (rsd == &state->afe.sd)
> +		state->afe.tx = enable ? tx : NULL;
> +	else
> +		state->hdmi.tx = enable ? tx : NULL;
> +
> +	tx->src = enable ? rsd : NULL;
> +
> +	if (state->afe.tx) {
> +		/* AFE Requires TXA enabled, even when output to TXB */
> +		io10 |= ADV748X_IO_10_CSI4_EN;
> +		if (is_txa(tx))
> +			io10 |= ADV748X_IO_10_CSI4_IN_SEL_AFE;
> +		else
> +			io10 |= ADV748X_IO_10_CSI1_EN;
> +	}
> +
> +	if (state->hdmi.tx)
> +		io10 |= ADV748X_IO_10_CSI4_EN;
> +
> +	return io_clrset(state, ADV748X_IO_10, io10_mask, io10);
> +}
> +
> +static const struct media_entity_operations adv748x_tx_media_ops = {
> +	.link_setup	= adv748x_link_setup,
> +	.link_validate	= v4l2_subdev_link_validate,
> +};
>  
>  static const struct media_entity_operations adv748x_media_ops = {
>  	.link_validate = v4l2_subdev_link_validate,
> @@ -516,7 +561,8 @@ void adv748x_subdev_init(struct v4l2_subdev *sd, struct adv748x_state *state,
>  		state->client->addr, ident);
>  
>  	sd->entity.function = function;
> -	sd->entity.ops = &adv748x_media_ops;
> +	sd->entity.ops = is_tx(adv748x_sd_to_csi2(sd)) ?
> +			 &adv748x_tx_media_ops : &adv748x_media_ops;
>  }
>  
>  static int adv748x_parse_csi2_lanes(struct adv748x_state *state,
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index 934a9d9a75c8..b00c1995efb0 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -94,6 +94,7 @@ struct adv748x_csi2 {
>  #define is_tx_enabled(_tx) ((_tx)->state->endpoints[(_tx)->port] != NULL)
>  #define is_txa(_tx) ((_tx) == &(_tx)->state->txa)
>  #define is_txb(_tx) ((_tx) == &(_tx)->state->txb)
> +#define is_tx(_tx) (is_txa(_tx) || is_txb(_tx))
>  
>  #define is_afe_enabled(_state)					\
>  	((_state)->endpoints[ADV748X_PORT_AIN0] != NULL ||	\
> @@ -223,6 +224,7 @@ struct adv748x_state {
>  #define ADV748X_IO_10_CSI4_EN		BIT(7)
>  #define ADV748X_IO_10_CSI1_EN		BIT(6)
>  #define ADV748X_IO_10_PIX_OUT_EN	BIT(5)
> +#define ADV748X_IO_10_CSI4_IN_SEL_AFE	BIT(3)
>  
>  #define ADV748X_IO_CHIP_REV_ID_1	0xdf
>  #define ADV748X_IO_CHIP_REV_ID_2	0xe0
> 

-- 
Regards
--
Kieran