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  */
40 void calc_rc_params(struct rc_params *rc, const struct drm_dsc_config *pps)
41 {
42 	enum colour_mode mode;
43 	enum bits_per_comp bpc;
44 	bool is_navite_422_or_420;
45 	u16 drm_bpp = pps->bits_per_pixel;
46 	int slice_width  = pps->slice_width;
47 	int slice_height = pps->slice_height;
48 
49 	mode = pps->convert_rgb ? CM_RGB : (pps->simple_422  ? CM_444 :
50 					   (pps->native_422  ? CM_422 :
51 					    pps->native_420  ? CM_420 : CM_444));
52 	bpc = (pps->bits_per_component == 8) ? BPC_8 : (pps->bits_per_component == 10)
53 					     ? BPC_10 : BPC_12;
54 
55 	is_navite_422_or_420 = pps->native_422 || pps->native_420;
56 
57 	DC_FP_START();
58 	_do_calc_rc_params(rc, mode, bpc, drm_bpp, is_navite_422_or_420,
59 			   slice_width, slice_height,
60 			   pps->dsc_version_minor);
61 	DC_FP_END();
62 }
63 
64 /**
65  * calc_dsc_bytes_per_pixel - calculate bytes per pixel
66  * @pps: DRM struct with all required DSC values
67  *
68  * Based on the information inside drm_dsc_config, this function calculates the
69  * total of bytes per pixel.
70  *
71  * @note This calculation requires float point operation, most of it executes
72  * under kernel_fpu_{begin,end}.
73  *
74  * Return:
75  * Return the number of bytes per pixel
76  */
77 u32 calc_dsc_bytes_per_pixel(const struct drm_dsc_config *pps)
78 
79 {
80 	u32 ret;
81 	u16 drm_bpp = pps->bits_per_pixel;
82 	int slice_width  = pps->slice_width;
83 	bool is_navite_422_or_420 = pps->native_422 || pps->native_420;
84 
85 	DC_FP_START();
86 	ret = _do_bytes_per_pixel_calc(slice_width, drm_bpp,
87 				       is_navite_422_or_420);
88 	DC_FP_END();
89 	return ret;
90 }
91