1 /* 2 * Copyright (c) 2016 Intel Corporation 3 * 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. 13 * 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 20 * OF THIS SOFTWARE. 21 */ 22 23 #ifndef __DRM_COLOR_MGMT_H__ 24 #define __DRM_COLOR_MGMT_H__ 25 26 #include <linux/ctype.h> 27 28 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc, 29 uint degamma_lut_size, 30 bool has_ctm, 31 uint gamma_lut_size); 32 33 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc, 34 int gamma_size); 35 36 /** 37 * drm_color_lut_extract - clamp&round LUT entries 38 * @user_input: input value 39 * @bit_precision: number of bits the hw LUT supports 40 * 41 * Extract a degamma/gamma LUT value provided by user (in the form of 42 * &drm_color_lut entries) and round it to the precision supported by the 43 * hardware. 44 */ 45 static inline uint32_t drm_color_lut_extract(uint32_t user_input, 46 uint32_t bit_precision) 47 { 48 uint32_t val = user_input; 49 uint32_t max = 0xffff >> (16 - bit_precision); 50 51 /* Round only if we're not using full precision. */ 52 if (bit_precision < 16) { 53 val += 1UL << (16 - bit_precision - 1); 54 val >>= 16 - bit_precision; 55 } 56 57 return clamp_val(val, 0, max); 58 } 59 60 61 #endif 62