2 * Copyright (c) 2016 Intel Corporation
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 #ifndef __DRM_COLOR_MGMT_H__
24 #define __DRM_COLOR_MGMT_H__
26 #include <linux/ctype.h>
28 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
29 uint degamma_lut_size,
33 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
37 * Extract a degamma/gamma LUT value provided by user and round it to the
38 * precision supported by the hardware.
40 static inline uint32_t drm_color_lut_extract(uint32_t user_input,
41 uint32_t bit_precision)
43 uint32_t val = user_input;
44 uint32_t max = 0xffff >> (16 - bit_precision);
46 /* Round only if we're not using full precision. */
47 if (bit_precision < 16) {
48 val += 1UL << (16 - bit_precision - 1);
49 val >>= 16 - bit_precision;
52 return clamp_val(val, 0, max);