[PATCH 09/20] drm: add helper functions for YCBCR420 handling

[Ville Syrjälä]

On Mon, Jul 10, 2017 at 04:48:37PM +0530, Shashank Sharma wrote:
> This patch adds helper functions for YCBCR 420 handling.
> These functions do:
> - check if a given video mode is YCBCR 420 only mode.
> - check if a given video mode is YCBCR 420 also mode.
> 
> V2: Added YCBCR functions as helpers in DRM layer, instead of
>     keeping it in I915 layer.
> V3: Added handling for YCBCR-420 only modes too.
> V4: EXPORT_SYMBOL(drm_find_hdmi_output_type)
> V5: Addressed review comments from Danvet:
>     - %s/drm_find_hdmi_output_type/drm_display_info_hdmi_output_type
>     - %s/drm_can_support_ycbcr_output/drm_display_supports_ycbcr_output
>     - %s/drm_can_support_this_ycbcr_output/
> 		drm_display_supports_this_ycbcr_output
>     - pass drm_display_info instead of drm_connector for consistency
>     - For drm_get_highest_quality_ycbcr_supported doc, move the variable
>       description above, and then the function description.
> V6: Add only YCBCR420 helpers (Ville)
> 
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> ---
>  drivers/gpu/drm/drm_modes.c | 74 +++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_modes.h     |  6 ++++
>  2 files changed, 80 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 3b53c8e3..61c82a38 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1604,3 +1604,77 @@ int drm_mode_convert_umode(struct drm_display_mode *out,
>  out:
>  	return ret;
>  }
> +
> +/**
> + * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
> + * output format
> + *
> + * @connector: drm connector under action.
> + * @mode: video mode to be tested.
> + *
> + * Returns:
> + * true if the mode can be supported in YCBCR420 format
> + * false if not.
> + */
> +bool drm_mode_is_420_only(struct drm_display_info *display,
> +			struct drm_display_mode *mode)

Both should be const. Indentation looks busted.

> +{
> +	u8 vic = drm_match_cea_mode(mode);
> +
> +	/*
> +	 * Requirements of a 420_only mode:
> +	 * must be a valid cea mode
> +	 * entry in 420_only bitmap
> +	 */
> +	if (!drm_valid_cea_vic(vic))
> +		return false;

More unnecessary checks.

> +
> +	return test_bit(vic, display->hdmi.y420_vdb_modes);
> +}
> +EXPORT_SYMBOL(drm_mode_is_420_only);
> +
> +/**
> + * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
> + * output format also (along with RGB/YCBCR444/422)
> + *
> + * @display: display under action.
> + * @mode: video mode to be tested.
> + *
> + * Returns:
> + * true if the mode can be support YCBCR420 format
> + * false if not.
> + */
> +bool drm_mode_is_420_also(struct drm_display_info *display,
> +			struct drm_display_mode *mode)
> +{
> +	u8 vic = drm_match_cea_mode(mode);
> +
> +	/*
> +	 * Requirements of a 420_also mode:
> +	 * must be a valid cea mode
> +	 * entry in 420_also bitmap
> +	 */
> +	if (!drm_valid_cea_vic(vic))
> +		return false;
> +
> +	return test_bit(vic, display->hdmi.y420_cmdb_modes);
> +}
> +EXPORT_SYMBOL(drm_mode_is_420_also);
> +/**
> + * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
> + * output format
> + *
> + * @display: display under action.
> + * @mode: video mode to be tested.
> + *
> + * Returns:
> + * true if the mode can be supported in YCBCR420 format
> + * false if not.
> + */
> +bool drm_mode_is_420(struct drm_display_info *display,
> +			struct drm_display_mode *mode)
> +{
> +	return drm_mode_is_420_only(display, mode) ||
> +		drm_mode_is_420_also(display, mode);
> +}
> +EXPORT_SYMBOL(drm_mode_is_420);
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index f8a1268..980db27 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -452,6 +452,12 @@ int drm_mode_convert_umode(struct drm_display_mode *out,
>  			   const struct drm_mode_modeinfo *in);
>  void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
>  void drm_mode_debug_printmodeline(const struct drm_display_mode *mode);
> +bool drm_mode_is_420_only(struct drm_display_info *display,
> +			struct drm_display_mode *mode);
> +bool drm_mode_is_420_also(struct drm_display_info *display,
> +			struct drm_display_mode *mode);
> +bool drm_mode_is_420(struct drm_display_info *display,
> +			struct drm_display_mode *mode);
>  
>  struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
>  				      int hdisplay, int vdisplay, int vrefresh,
> -- 
> 2.7.4
> 
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-- 
Ville Syrjälä
Intel OTC