From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 15 Mar 2018 17:23:38 +0200
Subject: drm: Introduce drm_color_lut_size()
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Git-commit: 41204dfeed93f2c7668cf8aa5086bcd96eccaa35
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Provide a small helper to convert the blob length in bytes
to the number of LUT entries.

v2: Add kerneldoc (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180315152338.7248-1-ville.syrjala@linux.intel.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 include/drm/drm_color_mgmt.h |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -38,6 +38,18 @@ void drm_crtc_enable_color_mgmt(struct d
 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
 				 int gamma_size);
 
+/**
+ * drm_color_lut_size - calculate the number of entries in the LUT
+ * @blob: blob containing the LUT
+ *
+ * Returns:
+ * The number of entries in the color LUT stored in @blob.
+ */
+static inline int drm_color_lut_size(const struct drm_property_blob *blob)
+{
+	return blob->length / sizeof(struct drm_color_lut);
+}
+
 enum drm_color_encoding {
 	DRM_COLOR_YCBCR_BT601,
 	DRM_COLOR_YCBCR_BT709,