drm: add helper to validate YCBCR420 modes

YCBCR420 modes are supported only on HDMI 2.0 capable sources.
This patch adds:
- A drm helper to validate YCBCR420-only mode on a particular
  connector. This function will help pruning the YCBCR420-only
  modes from the connector's modelist.
- A bool variable (ycbcr_420_allowed) in the drm connector structure.
  While handling the EDID from HDMI 2.0 sinks, its important to know
  if the source is capable of handling YCBCR420 output, so that no
  YCBCR 420 modes will be listed for sources which can't handle it.
  A driver should set this variable if it wants to see YCBCR420 modes
  in the modedb.

V5: Introduced the patch in series.
V6: Squashed two patches (validate YCBCR420 and add YCBCR420
	   identifier)
V7: Addressed review comments from Vile:
    - Move this patch before we add 420 modes from EDID.
    - No need for drm_valid_cea_vic() check, function back to non-static.
    - Update MODE_STATUS with NO_420 condition.
    - Introduce y420_vdb_modes variable in this patch

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1499960000-9232-6-git-send-email-shashank.sharma@intel.com
[vsyrjala: Drop the now bogus EXPORT_SYMBOL(drm_valid_cea_vic)]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index ae5b7dc316c8..26dd3eb9767d 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -135,6 +135,14 @@ struct drm_scdc {
 struct drm_hdmi_info {
 	/** @scdc: sink's scdc support and capabilities */
 	struct drm_scdc scdc;
+
+	/**
+	 * @y420_vdb_modes: bitmap of modes which can support ycbcr420
+	 * output only (not normal RGB/YCBCR444/422 outputs). There are total
+	 * 107 VICs defined by CEA-861-F spec, so the size is 128 bits to map
+	 * upto 128 VICs;
+	 */
+	unsigned long y420_vdb_modes[BITS_TO_LONGS(128)];
 };
 
 /**
@@ -726,6 +734,15 @@ struct drm_connector {
 	bool interlace_allowed;
 	bool doublescan_allowed;
 	bool stereo_allowed;
+
+	/**
+	 * @ycbcr_420_allowed : This bool indicates if this connector is
+	 * capable of handling YCBCR 420 output. While parsing the EDID
+	 * blocks, its very helpful to know, if the source is capable of
+	 * handling YCBCR 420 outputs.
+	 */
+	bool ycbcr_420_allowed;
+
 	/**
 	 * @registered: Is this connector exposed (registered) with userspace?
 	 * Protected by @mutex.