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

[Shashank Sharma <shashank.sharma@intel.com>]

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@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,
-- 
2.7.4

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