Re: [PATCH v11 07/11] drm: Add helper functions to handle aspect-ratio flag bits

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, Apr 20, 2018 at 07:01:47PM +0530, Nautiyal, Ankit K wrote:
> From: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> 
> This patch adds helper functions for determining if aspect-ratio is
> expected in user-mode and for allowing/disallowing the aspect-ratio,
> if its not expected.
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/drm_modes.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_modes.h     |  4 ++++
>  2 files changed, 51 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index c395a24..d6133e8 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1759,3 +1759,50 @@ bool drm_mode_is_420(const struct drm_display_info *display,
>  		drm_mode_is_420_also(display, mode);
>  }
>  EXPORT_SYMBOL(drm_mode_is_420);
> +
> +/**
> + * drm_mode_aspect_ratio_allowed - checks if the aspect-ratio information
> + * is expected from the user-mode.
> + *
> + * If the user has set aspect-ratio cap, then the flag of the user-mode is
> + * allowed to contain aspect-ratio value.
> + * If the user does not set aspect-ratio cap, then the only value allowed in the
> + * flags bits is aspect-ratio NONE.
> + *
> + * @file_priv: file private structure to get the user capabilities
> + * @umode: drm_mode_modeinfo struct, whose flag carry the aspect ratio
> + * information.
> + *
> + * Returns:
> + * true if the aspect-ratio info is allowed in the user-mode flags.
> + * false, otherwise.
> + */
> +bool
> +drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv,
> +			      struct drm_mode_modeinfo *umode)
> +{
> +	return file_priv->aspect_ratio_allowed || (umode->flags &
> +		DRM_MODE_FLAG_PIC_AR_MASK) == DRM_MODE_FLAG_PIC_AR_NONE;

Odd line split here. Makes this a bit hard to read.
I would split after the ||

> +}
> +EXPORT_SYMBOL(drm_mode_aspect_ratio_allowed);

Do we actually need to export these? I don't think so.

But I might be wrong. It's a bit hard to see with the way
you split this patch with the actual users in a different patch.

> +
> +/**
> + * drm_mode_filter_aspect_ratio_flags - filters the aspect-ratio bits in the
> + * user-mode flags.
> + *
> + * Checks if the aspect-ratio information is allowed. Resets the aspect-ratio
> + * bits in the user-mode flags, if aspect-ratio info is not allowed.
> + *
> + * @file_priv: file private structure to get the user capabilities.
> + * @umode: drm_mode_modeinfo struct, whose flags' aspect-ratio bits needs to
> + * be filtered.
> + *
> + */
> +void
> +drm_mode_filter_aspect_ratio_flags(const struct drm_file *file_priv,
> +				   struct drm_mode_modeinfo *umode)
> +{
> +	if (!drm_mode_aspect_ratio_allowed(file_priv, umode))
> +		umode->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
> +}
> +EXPORT_SYMBOL(drm_mode_filter_aspect_ratio_flags);
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index 2f78b7e..e0b060d 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -461,6 +461,10 @@ bool drm_mode_is_420_also(const struct drm_display_info *display,
>  			  const struct drm_display_mode *mode);
>  bool drm_mode_is_420(const struct drm_display_info *display,
>  		     const struct drm_display_mode *mode);
> +bool drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv,
> +				   struct drm_mode_modeinfo *umode);
> +void drm_mode_filter_aspect_ratio_flags(const struct drm_file *file_priv,
> +					struct drm_mode_modeinfo *umode);
>  
>  struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
>  				      int hdisplay, int vdisplay, int vrefresh,
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel
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