Re: [PATCH v10 08/14] media: tvp5150: add FORMAT_TRY support for get/set selection handlers

[Marco Felsch <m.felsch@pengutronix.de>]

Hi Hans,

On 19-09-27 11:01, Hans Verkuil wrote:
> On 8/30/19 12:16 PM, Marco Felsch wrote:
> > Since commit 10d5509c8d50 ("[media] v4l2: remove g/s_crop from video ops")
> > the 'which' field for set/get_selection must be FORMAT_ACTIVE. There is
> > no way to try different selections. The patch adds a helper function to
> > select the correct selection memory space (sub-device file handle or
> > driver state) which will be set/returned.
> > 
> > The selection rectangle is updated if the format is FORMAT_ACTIVE and
> > the rectangle position and/or size differs from the current set
> > rectangle.
> > 
> > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> 
> One checkpatch warning:
> 
> CHECK: Alignment should match open parenthesis
> #170: FILE: drivers/media/i2c/tvp5150.c:1155:
> +               crop = __tvp5150_get_pad_crop(decoder, cfg, sel->pad,
> +                                               sel->which);
> 
> I'd have fixed this myself, but since there are some changes needed
> elsewhere, you can pick this up as well for a v11.
> 
> And some more comments below:
> 
> > ---
> > Changelog:
> > 
> > v10:
> > - __tvp5150_get_pad_crop: drop confusing fall-through
> > - set_selection: fix FORMAT_TRY handling if CONFIG_VIDEO_V4L2_SUBDEV_API
> >                  is disabled. Adapt sel->r and return 0.
> > v8:
> > - adapt commit message
> > - remove wrong FORMAT_TRY handling for tvp5150_fill_fmt() handling
> > - return 0 during set_selection if FORMAT_TRY was requested and
> >   CONFIG_VIDEO_V4L2_SUBDEV_API is disabled
> > - return -EINVAL during get_selection if FORMAT_TRY was requested and
> >   CONFIG_VIDEO_V4L2_SUBDEV_API is disabled
> > v7:
> > - __tvp5150_get_pad_crop(): return error on default case
> > - simplify __tvp5150_get_pad_crop() error handling
> > - tvp5150_set_selection() squash __tvp5150_set_selection() execution
> >   conditions
> > v6:
> > nothing
> > v5:
> >  - handle stub for v4l2_subdev_get_try_crop() internal since commit
> >    ("media: v4l2-subdev: add stubs for v4l2_subdev_get_try_*")
> >    isn't anymore part of this series.
> >  - add error handling of __tvp5150_get_pad_crop()
> > v4:
> >  - fix merge conflict due to rebase on top of media-tree/master
> >  - __tvp5150_get_pad_crop(): cosmetic alignment fixes
> > 
> >  drivers/media/i2c/tvp5150.c | 113 ++++++++++++++++++++++++++----------
> >  1 file changed, 81 insertions(+), 32 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
> > index c1542a89e8c8..636e8737ac44 100644
> > --- a/drivers/media/i2c/tvp5150.c
> > +++ b/drivers/media/i2c/tvp5150.c
> > @@ -19,6 +19,7 @@
> >  #include <media/v4l2-ctrls.h>
> >  #include <media/v4l2-fwnode.h>
> >  #include <media/v4l2-mc.h>
> > +#include <media/v4l2-rect.h>
> >  
> >  #include "tvp5150_reg.h"
> >  
> > @@ -995,6 +996,25 @@ static void tvp5150_set_default(v4l2_std_id std, struct v4l2_rect *crop)
> >  		crop->height = TVP5150_V_MAX_OTHERS;
> >  }
> >  
> > +static struct v4l2_rect *
> > +__tvp5150_get_pad_crop(struct tvp5150 *decoder,
> > +		       struct v4l2_subdev_pad_config *cfg, unsigned int pad,
> > +		       enum v4l2_subdev_format_whence which)
> 
> Please don't use __ in the function name. Double underscores should never be
> used in C code since that's reserved for use by the compiler. What's wrong
> with just plain tvp5150_get_pad_crop()?

I tought it is common at least within the v4l subsystem. There are a
few other drivers following that __ pattern. Anyway I can rename it ;)

> > +{
> > +	switch (which) {
> > +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> > +		return &decoder->rect;
> > +	case V4L2_SUBDEV_FORMAT_TRY:
> > +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
> > +		return v4l2_subdev_get_try_crop(&decoder->sd, cfg, pad);
> > +#else
> > +		return ERR_PTR(-EINVAL);
> > +#endif
> > +	default:
> > +		return ERR_PTR(-EINVAL);
> > +	}
> > +}
> > +
> >  static int tvp5150_fill_fmt(struct v4l2_subdev *sd,
> >  			    struct v4l2_subdev_pad_config *cfg,
> >  			    struct v4l2_subdev_format *format)
> > @@ -1019,17 +1039,51 @@ static int tvp5150_fill_fmt(struct v4l2_subdev *sd,
> >  	return 0;
> >  }
> >  
> > +unsigned int tvp5150_get_hmax(struct v4l2_subdev *sd)
> > +{
> > +	struct tvp5150 *decoder = to_tvp5150(sd);
> > +	v4l2_std_id std;
> > +
> > +	/* Calculate height based on current standard */
> > +	if (decoder->norm == V4L2_STD_ALL)
> > +		std = tvp5150_read_std(sd);
> > +	else
> > +		std = decoder->norm;
> > +
> > +	return (std & V4L2_STD_525_60) ?
> > +		TVP5150_V_MAX_525_60 : TVP5150_V_MAX_OTHERS;
> > +}
> > +
> > +static inline void
> > +__tvp5150_set_selection(struct v4l2_subdev *sd, struct v4l2_rect *rect)
> 
> You can drop 'inline', there is no need for that.
> 
> I'd also rename the function to something more understandable. E.g.
> tvp5150_set_hw_selection().

Okay I will change that.

Regards,
  Marco 

> 
> > +{
> > +	struct tvp5150 *decoder = to_tvp5150(sd);
> > +	unsigned int hmax = tvp5150_get_hmax(sd);
> > +
> > +	regmap_write(decoder->regmap, TVP5150_VERT_BLANKING_START, rect->top);
> > +	regmap_write(decoder->regmap, TVP5150_VERT_BLANKING_STOP,
> > +		     rect->top + rect->height - hmax);
> > +	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_ST_MSB,
> > +		     rect->left >> TVP5150_CROP_SHIFT);
> > +	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_ST_LSB,
> > +		     rect->left | (1 << TVP5150_CROP_SHIFT));
> > +	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_STP_MSB,
> > +		     (rect->left + rect->width - TVP5150_MAX_CROP_LEFT) >>
> > +		     TVP5150_CROP_SHIFT);
> > +	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_STP_LSB,
> > +		     rect->left + rect->width - TVP5150_MAX_CROP_LEFT);
> > +}
> > +
> >  static int tvp5150_set_selection(struct v4l2_subdev *sd,
> >  				 struct v4l2_subdev_pad_config *cfg,
> >  				 struct v4l2_subdev_selection *sel)
> >  {
> >  	struct tvp5150 *decoder = to_tvp5150(sd);
> >  	struct v4l2_rect *rect = &sel->r;
> > -	v4l2_std_id std;
> > -	int hmax;
> > +	struct v4l2_rect *crop;
> > +	unsigned int hmax;
> >  
> > -	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
> > -	    sel->target != V4L2_SEL_TGT_CROP)
> > +	if (sel->target != V4L2_SEL_TGT_CROP)
> >  		return -EINVAL;
> >  
> >  	dev_dbg_lvl(sd->dev, 1, debug, "%s left=%d, top=%d, width=%d, height=%d\n",
> > @@ -1038,17 +1092,7 @@ static int tvp5150_set_selection(struct v4l2_subdev *sd,
> >  	/* tvp5150 has some special limits */
> >  	rect->left = clamp(rect->left, 0, TVP5150_MAX_CROP_LEFT);
> >  	rect->top = clamp(rect->top, 0, TVP5150_MAX_CROP_TOP);
> > -
> > -	/* Calculate height based on current standard */
> > -	if (decoder->norm == V4L2_STD_ALL)
> > -		std = tvp5150_read_std(sd);
> > -	else
> > -		std = decoder->norm;
> > -
> > -	if (std & V4L2_STD_525_60)
> > -		hmax = TVP5150_V_MAX_525_60;
> > -	else
> > -		hmax = TVP5150_V_MAX_OTHERS;
> > +	hmax = tvp5150_get_hmax(sd);
> >  
> >  	/*
> >  	 * alignments:
> > @@ -1061,20 +1105,23 @@ static int tvp5150_set_selection(struct v4l2_subdev *sd,
> >  			      hmax - TVP5150_MAX_CROP_TOP - rect->top,
> >  			      hmax - rect->top, 0, 0);
> >  
> > -	regmap_write(decoder->regmap, TVP5150_VERT_BLANKING_START, rect->top);
> > -	regmap_write(decoder->regmap, TVP5150_VERT_BLANKING_STOP,
> > -		     rect->top + rect->height - hmax);
> > -	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_ST_MSB,
> > -		     rect->left >> TVP5150_CROP_SHIFT);
> > -	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_ST_LSB,
> > -		     rect->left | (1 << TVP5150_CROP_SHIFT));
> > -	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_STP_MSB,
> > -		     (rect->left + rect->width - TVP5150_MAX_CROP_LEFT) >>
> > -		     TVP5150_CROP_SHIFT);
> > -	regmap_write(decoder->regmap, TVP5150_ACT_VD_CROP_STP_LSB,
> > -		     rect->left + rect->width - TVP5150_MAX_CROP_LEFT);
> > +	if (!IS_ENABLED(CONFIG_VIDEO_V4L2_SUBDEV_API) &&
> > +	    sel->which == V4L2_SUBDEV_FORMAT_TRY)
> > +		return 0;
> > +
> > +	crop = __tvp5150_get_pad_crop(decoder, cfg, sel->pad, sel->which);
> > +	if (IS_ERR(crop))
> > +		return PTR_ERR(crop);
> > +
> > +	/*
> > +	 * Update output image size if the selection (crop) rectangle size or
> > +	 * position has been modified.
> > +	 */
> > +	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
> > +	    !v4l2_rect_equal(rect, crop))
> > +		__tvp5150_set_selection(sd, rect);
> >  
> > -	decoder->rect = *rect;
> > +	*crop = *rect;
> >  
> >  	return 0;
> >  }
> > @@ -1084,11 +1131,9 @@ static int tvp5150_get_selection(struct v4l2_subdev *sd,
> >  				 struct v4l2_subdev_selection *sel)
> >  {
> >  	struct tvp5150 *decoder = container_of(sd, struct tvp5150, sd);
> > +	struct v4l2_rect *crop;
> >  	v4l2_std_id std;
> >  
> > -	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
> > -		return -EINVAL;
> > -
> >  	switch (sel->target) {
> >  	case V4L2_SEL_TGT_CROP_BOUNDS:
> >  		sel->r.left = 0;
> > @@ -1106,7 +1151,11 @@ static int tvp5150_get_selection(struct v4l2_subdev *sd,
> >  			sel->r.height = TVP5150_V_MAX_OTHERS;
> >  		return 0;
> >  	case V4L2_SEL_TGT_CROP:
> > -		sel->r = decoder->rect;
> > +		crop = __tvp5150_get_pad_crop(decoder, cfg, sel->pad,
> > +						sel->which);
> > +		if (IS_ERR(crop))
> > +			return PTR_ERR(crop);
> > +		sel->r = *crop;
> >  		return 0;
> >  	default:
> >  		return -EINVAL;
> > 
> 
> Regards,
> 
> 	Hans
> 

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