[PATCH 04/18] drm: Add structure for querying palette color capabilities

Shashank Sharma shashank.sharma at intel.com
Thu Aug 6 09:38:13 PDT 2015

From: Kausal Malladi <kausalmalladi at gmail.com>

The DRM color management framework is targeting various hardware
platforms and drivers. Different platforms can have different color
correction and enhancement capabilities.

A commom user space application can query these capabilities using the
DRM property interface. Each driver can fill this property with its
platform's palette color capabilities.

This patch adds new structure in DRM layer for querying palette color
capabilities. This structure will be used by all user space
agents to configure appropriate color configurations.

Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi at gmail.com>
 include/uapi/drm/drm.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 3801584..e3c642f 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -829,6 +829,17 @@ struct drm_event_vblank {
 	__u32 reserved;
+struct drm_palette_caps {
+	/* Structure version. Should be 1 currently */
+	__u32 version;
+	/* For padding and future use */
+	__u32 reserved;
+	/* This may be 0 if not supported. e.g. plane palette or VLV pipe */
+	__u32 num_samples_before_ctm;
+	/* This will be non-zero for pipe. May be zero for planes on some HW */
+	__u32 num_samples_after_ctm;
 /* typedef area */
 #ifndef __KERNEL__
 typedef struct drm_clip_rect drm_clip_rect_t;

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