[PATCH v5 02/17] drm: add YCBCR 420 capability identifier

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

This patch adds 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 YCBCR 420 outputs or not, so that
a lot of work can be done/bypassed based on this information. One such
example is adding YCBCR420 only modes.

If the driver knows that this source is not HDMI 2.0 capable, it will
not add YCBCR420-only modes while adding EDID modes, and will prevent
any runtime modeset failures.

This variable will be initialized from I915 driver in the next patch
and will be used in the EDID handling for HDMI 2.0 specific features,
in this same series.

V3: introduced the new variable
V4: changed variable name from is_hdmi2_src to ycbcr_420_allowed (Ville)
V4: adding r-b from Neil.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
---
 include/drm/drm_connector.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index ae5b7dc..8a78aaa 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -726,6 +726,15 @@ 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.
-- 
2.7.4

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