Re: [PATCH v1 3/5] [media] stm32-dcmi: cleanup variable/fields namings

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On 28/07/17 12:05, Hugues Fruchet wrote:
> Uniformize "pixfmt" variables to "pix".
> Change "current_fmt" & "dcmi_fmt" variables to variables
> with "sd_" prefix to explicitly refer to subdev format.
> 
> Signed-off-by: Hugues Fruchet <hugues.fruchet@xxxxxx>
> ---
>  drivers/media/platform/stm32/stm32-dcmi.c | 103 ++++++++++++++++--------------
>  1 file changed, 54 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
> index 526e354..4733d1f 100644
> --- a/drivers/media/platform/stm32/stm32-dcmi.c
> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
> @@ -132,9 +132,9 @@ struct stm32_dcmi {
>  	struct dcmi_graph_entity	entity;
>  	struct v4l2_format		fmt;
>  
> -	const struct dcmi_format	**user_formats;
> -	unsigned int			num_user_formats;
> -	const struct dcmi_format	*current_fmt;
> +	const struct dcmi_format	**sd_formats;
> +	unsigned int			nb_of_sd_formats;

Please rename this to num_of_sd_formats. 'nb' is non-standard and non-obvious.

Other than that this patch looks good and is a nice improvement.

Regards,

	Hans

> +	const struct dcmi_format	*sd_format;
>  
>  	/* Protect this data structure */
>  	struct mutex			lock;
> @@ -684,12 +684,12 @@ static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
>  static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
>  						       unsigned int fourcc)
>  {
> -	unsigned int num_formats = dcmi->num_user_formats;
> +	unsigned int num_formats = dcmi->nb_of_sd_formats;
>  	const struct dcmi_format *fmt;
>  	unsigned int i;
>  
>  	for (i = 0; i < num_formats; i++) {
> -		fmt = dcmi->user_formats[i];
> +		fmt = dcmi->sd_formats[i];
>  		if (fmt->fourcc == fourcc)
>  			return fmt;
>  	}
> @@ -698,40 +698,42 @@ static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
>  }
>  
>  static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
> -			const struct dcmi_format **current_fmt)
> +			const struct dcmi_format **sd_format)
>  {
> -	const struct dcmi_format *dcmi_fmt;
> -	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> +	const struct dcmi_format *sd_fmt;
> +	struct v4l2_pix_format *pix = &f->fmt.pix;
>  	struct v4l2_subdev_pad_config pad_cfg;
>  	struct v4l2_subdev_format format = {
>  		.which = V4L2_SUBDEV_FORMAT_TRY,
>  	};
>  	int ret;
>  
> -	dcmi_fmt = find_format_by_fourcc(dcmi, pixfmt->pixelformat);
> -	if (!dcmi_fmt) {
> -		dcmi_fmt = dcmi->user_formats[dcmi->num_user_formats - 1];
> -		pixfmt->pixelformat = dcmi_fmt->fourcc;
> +	sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
> +	if (!sd_fmt) {
> +		sd_fmt = dcmi->sd_formats[dcmi->nb_of_sd_formats - 1];
> +		pix->pixelformat = sd_fmt->fourcc;
>  	}
>  
>  	/* Limit to hardware capabilities */
> -	pixfmt->width = clamp(pixfmt->width, MIN_WIDTH, MAX_WIDTH);
> -	pixfmt->height = clamp(pixfmt->height, MIN_HEIGHT, MAX_HEIGHT);
> +	pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
> +	pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
>  
> -	v4l2_fill_mbus_format(&format.format, pixfmt, dcmi_fmt->mbus_code);
> +	v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
>  	ret = v4l2_subdev_call(dcmi->entity.subdev, pad, set_fmt,
>  			       &pad_cfg, &format);
>  	if (ret < 0)
>  		return ret;
>  
> -	v4l2_fill_pix_format(pixfmt, &format.format);
> +	/* Update pix regarding to what sensor can do */
> +	v4l2_fill_pix_format(pix, &format.format);
>  
> -	pixfmt->field = V4L2_FIELD_NONE;
> -	pixfmt->bytesperline = pixfmt->width * dcmi_fmt->bpp;
> -	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
>  
> -	if (current_fmt)
> -		*current_fmt = dcmi_fmt;
> +	pix->field = V4L2_FIELD_NONE;
> +	pix->bytesperline = pix->width * sd_fmt->bpp;
> +	pix->sizeimage = pix->bytesperline * pix->height;
> +
> +	if (sd_format)
> +		*sd_format = sd_fmt;
>  
>  	return 0;
>  }
> @@ -741,22 +743,25 @@ static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
>  	struct v4l2_subdev_format format = {
>  		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
>  	};
> -	const struct dcmi_format *current_fmt;
> +	const struct dcmi_format *sd_format;
> +	struct v4l2_mbus_framefmt *mf = &format.format;
> +	struct v4l2_pix_format *pix = &f->fmt.pix;
>  	int ret;
>  
> -	ret = dcmi_try_fmt(dcmi, f, &current_fmt);
> +	ret = dcmi_try_fmt(dcmi, f, &sd_format);
>  	if (ret)
>  		return ret;
>  
> -	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
> -			      current_fmt->mbus_code);
> +	/* pix to mbus format */
> +	v4l2_fill_mbus_format(mf, pix,
> +			      sd_format->mbus_code);
>  	ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
>  			       set_fmt, NULL, &format);
>  	if (ret < 0)
>  		return ret;
>  
>  	dcmi->fmt = *f;
> -	dcmi->current_fmt = current_fmt;
> +	dcmi->sd_format = sd_format;
>  
>  	return 0;
>  }
> @@ -785,10 +790,10 @@ static int dcmi_enum_fmt_vid_cap(struct file *file, void  *priv,
>  {
>  	struct stm32_dcmi *dcmi = video_drvdata(file);
>  
> -	if (f->index >= dcmi->num_user_formats)
> +	if (f->index >= dcmi->nb_of_sd_formats)
>  		return -EINVAL;
>  
> -	f->pixelformat = dcmi->user_formats[f->index]->fourcc;
> +	f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
>  	return 0;
>  }
>  
> @@ -830,18 +835,18 @@ static int dcmi_enum_framesizes(struct file *file, void *fh,
>  				struct v4l2_frmsizeenum *fsize)
>  {
>  	struct stm32_dcmi *dcmi = video_drvdata(file);
> -	const struct dcmi_format *dcmi_fmt;
> +	const struct dcmi_format *sd_fmt;
>  	struct v4l2_subdev_frame_size_enum fse = {
>  		.index = fsize->index,
>  		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
>  	};
>  	int ret;
>  
> -	dcmi_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
> -	if (!dcmi_fmt)
> +	sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
> +	if (!sd_fmt)
>  		return -EINVAL;
>  
> -	fse.code = dcmi_fmt->mbus_code;
> +	fse.code = sd_fmt->mbus_code;
>  
>  	ret = v4l2_subdev_call(dcmi->entity.subdev, pad, enum_frame_size,
>  			       NULL, &fse);
> @@ -859,7 +864,7 @@ static int dcmi_enum_frameintervals(struct file *file, void *fh,
>  				    struct v4l2_frmivalenum *fival)
>  {
>  	struct stm32_dcmi *dcmi = video_drvdata(file);
> -	const struct dcmi_format *dcmi_fmt;
> +	const struct dcmi_format *sd_fmt;
>  	struct v4l2_subdev_frame_interval_enum fie = {
>  		.index = fival->index,
>  		.width = fival->width,
> @@ -868,11 +873,11 @@ static int dcmi_enum_frameintervals(struct file *file, void *fh,
>  	};
>  	int ret;
>  
> -	dcmi_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
> -	if (!dcmi_fmt)
> +	sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
> +	if (!sd_fmt)
>  		return -EINVAL;
>  
> -	fie.code = dcmi_fmt->mbus_code;
> +	fie.code = sd_fmt->mbus_code;
>  
>  	ret = v4l2_subdev_call(dcmi->entity.subdev, pad,
>  			       enum_frame_interval, NULL, &fie);
> @@ -994,7 +999,7 @@ static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
>  			.width		= CIF_WIDTH,
>  			.height		= CIF_HEIGHT,
>  			.field		= V4L2_FIELD_NONE,
> -			.pixelformat	= dcmi->user_formats[0]->fourcc,
> +			.pixelformat	= dcmi->sd_formats[0]->fourcc,
>  		},
>  	};
>  	int ret;
> @@ -1002,7 +1007,7 @@ static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
>  	ret = dcmi_try_fmt(dcmi, &f, NULL);
>  	if (ret)
>  		return ret;
> -	dcmi->current_fmt = dcmi->user_formats[0];
> +	dcmi->sd_format = dcmi->sd_formats[0];
>  	dcmi->fmt = f;
>  	return 0;
>  }
> @@ -1025,7 +1030,7 @@ static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
>  
>  static int dcmi_formats_init(struct stm32_dcmi *dcmi)
>  {
> -	const struct dcmi_format *dcmi_fmts[ARRAY_SIZE(dcmi_formats)];
> +	const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
>  	unsigned int num_fmts = 0, i, j;
>  	struct v4l2_subdev *subdev = dcmi->entity.subdev;
>  	struct v4l2_subdev_mbus_code_enum mbus_code = {
> @@ -1040,13 +1045,13 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi)
>  
>  			/* Code supported, have we got this fourcc yet? */
>  			for (j = 0; j < num_fmts; j++)
> -				if (dcmi_fmts[j]->fourcc ==
> +				if (sd_fmts[j]->fourcc ==
>  						dcmi_formats[i].fourcc)
>  					/* Already available */
>  					break;
>  			if (j == num_fmts)
>  				/* New */
> -				dcmi_fmts[num_fmts++] = dcmi_formats + i;
> +				sd_fmts[num_fmts++] = dcmi_formats + i;
>  		}
>  		mbus_code.index++;
>  	}
> @@ -1054,18 +1059,18 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi)
>  	if (!num_fmts)
>  		return -ENXIO;
>  
> -	dcmi->num_user_formats = num_fmts;
> -	dcmi->user_formats = devm_kcalloc(dcmi->dev,
> -					 num_fmts, sizeof(struct dcmi_format *),
> -					 GFP_KERNEL);
> -	if (!dcmi->user_formats) {
> -		dev_err(dcmi->dev, "could not allocate memory\n");
> +	dcmi->nb_of_sd_formats = num_fmts;
> +	dcmi->sd_formats = devm_kcalloc(dcmi->dev,
> +					num_fmts, sizeof(struct dcmi_format *),
> +					GFP_KERNEL);
> +	if (!dcmi->sd_formats) {
> +		dev_err(dcmi->dev, "Could not allocate memory\n");
>  		return -ENOMEM;
>  	}
>  
> -	memcpy(dcmi->user_formats, dcmi_fmts,
> +	memcpy(dcmi->sd_formats, sd_fmts,
>  	       num_fmts * sizeof(struct dcmi_format *));
> -	dcmi->current_fmt = dcmi->user_formats[0];
> +	dcmi->sd_format = dcmi->sd_formats[0];
>  
>  	return 0;
>  }
> 

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