Re: [PATCH v10 13/14] media: tvp5150: add support to limit sdtv standards

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Hi Marco,

On 8/30/19 12:16 PM, Marco Felsch wrote:
> The tvp5150 accepts NTSC(M,J,4.43), PAL (B,D,G,H,I,M,N) and SECAM video
> data and is able to auto-detect the input signal. The auto-detection
> does not work if the connector does not receive an input signal and the
> tvp5150 might not be configured correctly. This misconfiguration leads
> into wrong decoded video streams if the tvp5150 gets powered on before
> the video signal is present.
> 
> Limit the supported sdtv standards according to the actual selected
> connector to avoid a misconfiguration.
> 
> Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>

checkpatch gave a bunch of warnings:

WARNING: line over 80 characters
#97: FILE: drivers/media/i2c/tvp5150.c:1393:
+                       decoder->cur_connector->base.connector.analog.sdtv_stds);

WARNING: line over 80 characters
#107: FILE: drivers/media/i2c/tvp5150.c:1613:
+                               decoder->connectors[i].base.connector.analog.sdtv_stds);

CHECK: Alignment should match open parenthesis
#107: FILE: drivers/media/i2c/tvp5150.c:1613:
+                       tvp5150_s_std(sd,
+                               decoder->connectors[i].base.connector.analog.sdtv_stds);

I think it would be best to introduce a local pointer to
decoder->connectors[i].base.connector.analog.

Regards,

	Hans

> ---
> [1] https://patchwork.kernel.org/cover/10794703/
> 
> v8:
> - adapt commit message
> - fix rebasing issue
> - apdapt to new v4l2_fwnode_connector_analog naming
> - fix cur_connector update during tvp5150_link_setup()
>   -> Only update if we have of-connectors.
> - fix supported_stds detection during tvp5150_s_std()
>   -> use connectors_num to detect of-connectors presence
> 
> v5:
> - probe() initialize supported tv-norms according the given connectors
>   if they are available.
> - check if media-controller is used. Don't limit the norm if it isn't
>   used.
> - add more logic to be smarter during connector changing so it is
>   intuitiver for the user space.
> 
> v2-v4:
> - nothing since the patch was squashed from series [1] into this
>   series.
> 
>  drivers/media/i2c/tvp5150.c | 78 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 76 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
> index d7079809f33f..da7e7fe16f89 100644
> --- a/drivers/media/i2c/tvp5150.c
> +++ b/drivers/media/i2c/tvp5150.c
> @@ -32,6 +32,13 @@
>  #define TVP5150_MBUS_FMT	MEDIA_BUS_FMT_UYVY8_2X8
>  #define TVP5150_FIELD		V4L2_FIELD_ALTERNATE
>  #define TVP5150_COLORSPACE	V4L2_COLORSPACE_SMPTE170M
> +#define TVP5150_STD_MASK	(V4L2_STD_NTSC     | \
> +				 V4L2_STD_NTSC_443 | \
> +				 V4L2_STD_PAL      | \
> +				 V4L2_STD_PAL_M    | \
> +				 V4L2_STD_PAL_N    | \
> +				 V4L2_STD_PAL_Nc   | \
> +				 V4L2_STD_SECAM)
>  
>  #define TVP5150_MAX_CONNECTORS	3 /* Check dt-bindings for more information */
>  
> @@ -64,6 +71,7 @@ struct tvp5150 {
>  
>  	struct media_pad pads[TVP5150_NUM_PADS];
>  	struct tvp5150_connector connectors[TVP5150_MAX_CONNECTORS];
> +	struct tvp5150_connector *cur_connector;
>  	unsigned int connectors_num;
>  
>  	struct v4l2_ctrl_handler hdl;
> @@ -783,17 +791,33 @@ static int tvp5150_g_std(struct v4l2_subdev *sd, v4l2_std_id *std)
>  static int tvp5150_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
>  {
>  	struct tvp5150 *decoder = to_tvp5150(sd);
> +	struct tvp5150_connector *cur_con = decoder->cur_connector;
> +	v4l2_std_id supported_stds;
>  
>  	if (decoder->norm == std)
>  		return 0;
>  
> +	/* In case of no of-connectors are available no limitations are made */
> +	if (!decoder->connectors_num)
> +		supported_stds = V4L2_STD_ALL;
> +	else
> +		supported_stds = cur_con->base.connector.analog.sdtv_stds;
> +
> +	/*
> +	 * Check if requested std or group of std's is/are supported by the
> +	 * connector.
> +	 */
> +	if ((supported_stds & std) == 0)
> +		return -EINVAL;
> +
>  	/* Change cropping height limits */
>  	if (std & V4L2_STD_525_60)
>  		decoder->rect.height = TVP5150_V_MAX_525_60;
>  	else
>  		decoder->rect.height = TVP5150_V_MAX_OTHERS;
>  
> -	decoder->norm = std;
> +	/* Set only the specific supported std in case of group of std's. */
> +	decoder->norm = supported_stds & std;
>  
>  	return tvp5150_set_std(sd, std);
>  }
> @@ -1331,6 +1355,8 @@ static int tvp5150_link_setup(struct media_entity *entity,
>  			  TVP5150_BLACK_SCREEN, 0);
>  
>  	if (flags & MEDIA_LNK_FL_ENABLED) {
> +		u32 new_norm;
> +
>  		/*
>  		 * S-Video connector is conneted to both ports AIP1A and AIP1B.
>  		 * Both links must be enabled in one-shot regardless which link
> @@ -1342,6 +1368,29 @@ static int tvp5150_link_setup(struct media_entity *entity,
>  			if (err)
>  				return err;
>  		}
> +
> +		if (!decoder->connectors_num)
> +			return 0;
> +
> +		/* Update the current connector */
> +		decoder->cur_connector =
> +			container_of(remote, struct tvp5150_connector, pad);
> +
> +		/*
> +		 * Do nothing if the new connector supports the same tv-norms as
> +		 * the old one.
> +		 */
> +		new_norm = decoder->norm &
> +			decoder->cur_connector->base.connector.analog.sdtv_stds;
> +		if (decoder->norm == new_norm)
> +			return 0;
> +
> +		/*
> +		 * Fallback to the new connector tv-norms if we can't find any
> +		 * common between the current tv-norm and the new one.
> +		 */
> +		tvp5150_s_std(sd, new_norm ? new_norm :
> +			decoder->cur_connector->base.connector.analog.sdtv_stds);
>  	}
>  
>  	return 0;
> @@ -1559,6 +1608,9 @@ static int tvp5150_registered(struct v4l2_subdev *sd)
>  				TVP5150_COMPOSITE1;
>  
>  			tvp5150_selmux(sd);
> +			decoder->cur_connector = &decoder->connectors[i];
> +			tvp5150_s_std(sd,
> +				decoder->connectors[i].base.connector.analog.sdtv_stds);
>  		}
>  	}
>  
> @@ -1848,6 +1900,13 @@ tvp5150_add_connector(struct tvp5150 *decoder, struct device_node *np,
>  		goto err;
>  	}
>  
> +	if (!(vc->connector.analog.sdtv_stds & TVP5150_STD_MASK)) {
> +		dev_err(dev, "Unsupported tv-norm on connector %s\n",
> +			remote_np->name);
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
>  	c->ent.flags = MEDIA_ENT_FL_CONNECTOR;
>  	c->ent.name = vc->label;
>  	c->ent.name = kasprintf(GFP_KERNEL, "%s %s", remote_np->name,
> @@ -1945,6 +2004,7 @@ static int tvp5150_probe(struct i2c_client *c)
>  	struct v4l2_subdev *sd;
>  	struct device_node *np = c->dev.of_node;
>  	struct regmap *map;
> +	unsigned int i;
>  	int res;
>  
>  	/* Check if the adapter supports the needed features */
> @@ -1989,7 +2049,21 @@ static int tvp5150_probe(struct i2c_client *c)
>  	if (res < 0)
>  		return res;
>  
> -	core->norm = V4L2_STD_ALL;	/* Default is autodetect */
> +	/*
> +	 * Iterate over all available connectors in case they are supported and
> +	 * successfully parsed. Fallback to default autodetect in case they
> +	 * aren't supported.
> +	 */
> +	for (i = 0; i < core->connectors_num; i++) {
> +		struct v4l2_fwnode_connector *vc;
> +
> +		vc = &core->connectors[i].base;
> +		core->norm |= vc->connector.analog.sdtv_stds;
> +	}
> +
> +	if (!core->connectors_num)
> +		core->norm = V4L2_STD_ALL;
> +
>  	core->detected_norm = V4L2_STD_UNKNOWN;
>  	core->input = TVP5150_COMPOSITE1;
>  	core->enable = true;
> 




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