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)
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 --- 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) +{ + 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; + + 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,