Re: [PATCH 5/5] media: tvp5150: add support to limit tv norms on connector

[Mauro Carvalho Chehab <mchehab@kernel.org>]

Em Wed, 20 Mar 2019 17:36:50 +0100
Marco Felsch <m.felsch@pengutronix.de> escreveu:

> Hi Mauro,
> 
> On 19-03-20 11:18, Mauro Carvalho Chehab wrote:
> > Em Sat,  2 Feb 2019 13:10:04 +0100
> > Marco Felsch <m.felsch@pengutronix.de> escreveu:
> >   
> > > 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.   
> > 
> > Hmm... I'm afraid of this change. As far as I remember, I tested some
> > weird format variants like V4L2_STD_PAL_60 a long time ago, but there's
> > no way to force video to use those. The format selection logic simply
> > places the device on auto-detect mode for those weirdos, and that
> > works fine at the devices I know.  
> 
> Sorry I didn't get this. The format is set to autodetect during probe().

Yes, but apps will change based on G_FMT, TRY_FMT and S_FMT.

See, my main concern here is with existing tvp5150 non-platform
drivers, as a change there would be a regression.

> If there is no format limitation this won't be changed during
> media.link_setup(). You're right I forgot to check if the cur_connector
> is available during tvp5150_s_std(), in case of pdata related devices.

Yeah, that's what I'm talking about.

> In such a case we should set supported_norms to V4L2_STD_ALL as it is
> done by v4l2_fwnode_parse_connector() if no limitations are given.
> 
> Btw, how does it look with the other patchset?

I asked Hans to take a look at the patch series, as he's sub-maintaining
the v4l2 stuff. 

I'm intending to take
a deeper look at patch 2/7 v4 from the past series.

> 
> Regards,
> Marco
> 
> > 
> > A change like that may break things. So I would actually have a quirk
> > to optionally disable auto-detection on devices that this is not know
> > to work.
> >   
> > > 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 tv norms according to the actual selected connector
> > > to avoid a misconfiguration.
> > > 
> > > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> > > ---
> > >  drivers/media/i2c/tvp5150.c | 42 ++++++++++++++++++++++++++++++++++++-
> > >  1 file changed, 41 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
> > > index f3a2ad00a40d..7619793dee67 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)
> > >  
> > >  MODULE_DESCRIPTION("Texas Instruments TVP5150A/TVP5150AM1/TVP5151 video decoder driver");
> > >  MODULE_AUTHOR("Mauro Carvalho Chehab");
> > > @@ -74,6 +81,7 @@ struct tvp5150 {
> > >  	struct media_pad pads[TVP5150_NUM_PADS];
> > >  	int pads_state[TVP5150_NUM_PADS];
> > >  	struct tvp5150_connector *connectors;
> > > +	struct tvp5150_connector *cur_connector;
> > >  	int connectors_num;
> > >  	bool modify_second_link;
> > >  #endif
> > > @@ -794,17 +802,27 @@ 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);
> > > +	v4l2_std_id supported_norms =
> > > +		decoder->cur_connector->base.connector.analog.supported_tvnorms;
> > >  
> > >  	if (decoder->norm == std)
> > >  		return 0;
> > >  
> > > +	/*
> > > +	 * check if requested std or group of std's is/are supported by the
> > > +	 * connector
> > > +	 */
> > > +	if ((supported_norms & 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_norms & std;
> > >  
> > >  	return tvp5150_set_std(sd, std);
> > >  }
> > > @@ -1298,6 +1316,7 @@ static int tvp5150_link_setup(struct media_entity *entity,
> > >  	int *pad_state = &decoder->pads_state[0];
> > >  	int i, active_pad, ret = 0;
> > >  	bool is_svideo = false;
> > > +	bool update_cur_connector = false;
> > >  
> > >  	/*
> > >  	 * The tvp state is determined by the enabled sink pad link.
> > > @@ -1344,10 +1363,12 @@ static int tvp5150_link_setup(struct media_entity *entity,
> > >  				decoder->modify_second_link = false;
> > >  				tvp5150_s_routing(sd, TVP5150_SVIDEO,
> > >  						  TVP5150_NORMAL, 0);
> > > +				update_cur_connector = true;
> > >  			}
> > >  		} else {
> > >  			tvp5150_s_routing(sd, tvp5150_pad->index,
> > >  					  TVP5150_NORMAL, 0);
> > > +			update_cur_connector = true;
> > >  		}
> > >  	} else {
> > >  		/*
> > > @@ -1376,6 +1397,14 @@ static int tvp5150_link_setup(struct media_entity *entity,
> > >  					  active_pad, TVP5150_BLACK_SCREEN, 0);
> > >  		decoder->modify_second_link = false;
> > >  	}
> > > +
> > > +	if (update_cur_connector) {
> > > +		/* Update tvnorm according to connector */
> > > +		decoder->cur_connector =
> > > +			container_of(remote, struct tvp5150_connector, pad);
> > > +		tvp5150_s_std(sd,
> > > +			decoder->cur_connector->base.connector.analog.supported_tvnorms);
> > > +	}
> > >  out:
> > >  	return ret;
> > >  }
> > > @@ -1605,6 +1634,9 @@ static int tvp5150_registered(struct v4l2_subdev *sd)
> > >  			}
> > >  			tvp5150_selmux(sd);
> > >  			decoder->modify_second_link = false;
> > > +			decoder->cur_connector = &decoder->connectors[i];
> > > +			tvp5150_s_std(sd,
> > > +				decoder->connectors[i].base.connector.analog.supported_tvnorms);
> > >  		}
> > >  	}
> > >  #endif
> > > @@ -1925,6 +1957,14 @@ static int tvp5150_parse_dt(struct tvp5150 *decoder, struct device_node *np)
> > >  				ret = -EINVAL;
> > >  				goto err;
> > >  			}
> > > +			if (!(c.connector.analog.supported_tvnorms &
> > > +			    TVP5150_STD_MASK)) {
> > > +				dev_err(dev,
> > > +					"Invalid tv norm(s) on connector %s.\n",
> > > +					c.label);
> > > +				ret = -EINVAL;
> > > +				goto err;
> > > +			}
> > >  			in++;
> > >  			break;
> > >  		case TVP5150_PAD_VID_OUT:  
> > 
> > 
> > 
> > Thanks,
> > Mauro
> >   
> 



Thanks,
Mauro
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