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drm: add helper functions for YCBCR420 handling

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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)
V7: Addressed review comments from Ville
    - Remove cea_vic_valid() check.
    - Fix indentation.
    - Make input parameters to helpers, const.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1499960000-9232-9-git-send-email-shashank.sharma@intel.com
[vsyrjala: Fix sparse indentation warn]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Shashank Sharma 2017-07-13 21:03:14 +05:30 committed by Ville Syrjälä
parent e6a9a2c3dc
commit 2570fe2586
2 changed files with 64 additions and 0 deletions
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58
drivers/gpu/drm/drm_modes.c
View File

@ -1605,3 +1605,61 @@ 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(const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
u8 vic = drm_match_cea_mode(mode);
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(const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
u8 vic = drm_match_cea_mode(mode);
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(const struct drm_display_info *display,
const 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);

6
include/drm/drm_modes.h
View File

@ -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(const struct drm_display_info *display,
const struct drm_display_mode *mode);
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);
struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
int hdisplay, int vdisplay, int vrefresh,