1
2/*
3 * Copyright 2017 Advanced Micro Devices, Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors: AMD
24 *
25 */
26#include "rc_calc.h"
27
28/**
29 * calc_rc_params - reads the user's cmdline mode
30 * @rc: DC internal DSC parameters
31 * @pps: DRM struct with all required DSC values
32 *
33 * This function expects a drm_dsc_config data struct with all the required DSC
34 * values previously filled out by our driver and based on this information it
35 * computes some of the DSC values.
36 *
37 * @note This calculation requires float point operation, most of it executes
38 * under kernel_fpu_{begin,end}.
39 */
40void calc_rc_params(struct rc_params *rc, const struct drm_dsc_config *pps)
41{
42#if defined(CONFIG_DRM_AMD_DC_FP)
43 enum colour_mode mode;
44 enum bits_per_comp bpc;
45 bool is_navite_422_or_420;
46 u16 drm_bpp = pps->bits_per_pixel;
47 int slice_width = pps->slice_width;
48 int slice_height = pps->slice_height;
49
50 mode = pps->convert_rgb ? CM_RGB : (pps->simple_422 ? CM_444 :
51 (pps->native_422 ? CM_422 :
52 pps->native_420 ? CM_420 : CM_444));
53 bpc = (pps->bits_per_component == 8) ? BPC_8 : (pps->bits_per_component == 10)
54 ? BPC_10 : BPC_12;
55
56 is_navite_422_or_420 = pps->native_422 || pps->native_420;
57
58 DC_FP_START();
59 _do_calc_rc_params(rc, cm: mode, bpc, drm_bpp, is_navite_422_or_420,
60 slice_width, slice_height,
61 minor_version: pps->dsc_version_minor);
62 DC_FP_END();
63#endif
64}
65

source code of linux/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c