drivers/gpu/drm/tidss/tidss_scale_coefs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
   4  * Author: Jyri Sarha <jsarha@ti.com>
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/kernel.h>
   9
  10 #include "tidss_scale_coefs.h"
  11
  12 /*
  13  * These are interpolated with a custom python script from DSS5
  14  * (drivers/gpu/drm/omapdrm/dss/dispc_coef.c) coefficients.
  15  */
  16 static const struct tidss_scale_coefs coef5_m32 = {
  17         .c2 = { 28, 34, 40, 46, 52, 58, 64, 70, 0, 2, 4, 8, 12, 16, 20, 24, },
  18         .c1 = { 132, 138, 144, 150, 156, 162, 168, 174, 76, 84, 92, 98, 104, 110, 116, 124, },
  19         .c0 = { 192, 192, 192, 190, 188, 186, 184, 182, 180, },
  20 };
  21
  22 static const struct tidss_scale_coefs coef5_m26 = {
  23         .c2 = { 24, 28, 32, 38, 44, 50, 56, 64, 0, 2, 4, 6, 8, 12, 16, 20, },
  24         .c1 = { 132, 138, 144, 152, 160, 166, 172, 178, 72, 80, 88, 94, 100, 108, 116, 124, },
  25         .c0 = { 200, 202, 204, 202, 200, 196, 192, 188, 184, },
  26 };
  27
  28 static const struct tidss_scale_coefs coef5_m22 = {
  29         .c2 = { 16, 20, 24, 30, 36, 42, 48, 56, 0, 0, 0, 2, 4, 8, 12, 14, },
  30         .c1 = { 132, 140, 148, 156, 164, 172, 180, 186, 64, 72, 80, 88, 96, 104, 112, 122, },
  31         .c0 = { 216, 216, 216, 214, 212, 208, 204, 198, 192, },
  32 };
  33
  34 static const struct tidss_scale_coefs coef5_m19 = {
  35         .c2 = { 12, 14, 16, 22, 28, 34, 40, 48, 0, 0, 0, 2, 4, 4, 4, 8, },
  36         .c1 = { 128, 140, 152, 160, 168, 176, 184, 192, 56, 64, 72, 82, 92, 100, 108, 118, },
  37         .c0 = { 232, 232, 232, 226, 220, 218, 216, 208, 200, },
  38 };
  39
  40 static const struct tidss_scale_coefs coef5_m16 = {
  41         .c2 = { 0, 2, 4, 8, 12, 18, 24, 32, 0, 0, 0, -2, -4, -4, -4, -2, },
  42         .c1 = { 124, 138, 152, 164, 176, 186, 196, 206, 40, 48, 56, 68, 80, 90, 100, 112, },
  43         .c0 = { 264, 262, 260, 254, 248, 242, 236, 226, 216, },
  44 };
  45
  46 static const struct tidss_scale_coefs coef5_m14 = {
  47         .c2 = { -8, -6, -4, -2, 0, 6, 12, 18, 0, -2, -4, -6, -8, -8, -8, -8, },
  48         .c1 = { 120, 134, 148, 164, 180, 194, 208, 220, 24, 32, 40, 52, 64, 78, 92, 106, },
  49         .c0 = { 288, 286, 284, 280, 276, 266, 256, 244, 232, },
  50 };
  51
  52 static const struct tidss_scale_coefs coef5_m13 = {
  53         .c2 = { -12, -12, -12, -10, -8, -4, 0, 6, 0, -2, -4, -6, -8, -10, -12, -12, },
  54         .c1 = { 112, 130, 148, 164, 180, 196, 212, 228, 12, 22, 32, 44, 56, 70, 84, 98, },
  55         .c0 = { 312, 308, 304, 298, 292, 282, 272, 258, 244, },
  56 };
  57
  58 static const struct tidss_scale_coefs coef5_m12 = {
  59         .c2 = { -16, -18, -20, -18, -16, -14, -12, -6, 0, -2, -4, -6, -8, -10, -12, -14, },
  60         .c1 = { 104, 124, 144, 164, 184, 202, 220, 238, 0, 10, 20, 30, 40, 56, 72, 88, },
  61         .c0 = { 336, 332, 328, 320, 312, 300, 288, 272, 256, },
  62 };
  63
  64 static const struct tidss_scale_coefs coef5_m11 = {
  65         .c2 = { -20, -22, -24, -24, -24, -24, -24, -20, 0, -2, -4, -6, -8, -10, -12, -16, },
  66         .c1 = { 92, 114, 136, 158, 180, 204, 228, 250, -16, -8, 0, 12, 24, 38, 52, 72, },
  67         .c0 = { 368, 364, 360, 350, 340, 326, 312, 292, 272, },
  68 };
  69
  70 static const struct tidss_scale_coefs coef5_m10 = {
  71         .c2 = { -16, -20, -24, -28, -32, -34, -36, -34, 0, 0, 0, -2, -4, -8, -12, -14, },
  72         .c1 = { 72, 96, 120, 148, 176, 204, 232, 260, -32, -26, -20, -10, 0, 16, 32, 52, },
  73         .c0 = { 400, 398, 396, 384, 372, 354, 336, 312, 288, },
  74 };
  75
  76 static const struct tidss_scale_coefs coef5_m9 = {
  77         .c2 = { -12, -18, -24, -28, -32, -38, -44, -46, 0, 2, 4, 2, 0, -2, -4, -8, },
  78         .c1 = { 40, 68, 96, 128, 160, 196, 232, 268, -48, -46, -44, -36, -28, -14, 0, 20, },
  79         .c0 = { 456, 450, 444, 428, 412, 388, 364, 334, 304, },
  80 };
  81
  82 static const struct tidss_scale_coefs coef5_m8 = {
  83         .c2 = { 0, -4, -8, -16, -24, -32, -40, -48, 0, 2, 4, 6, 8, 6, 4, 2, },
  84         .c1 = { 0, 28, 56, 94, 132, 176, 220, 266, -56, -60, -64, -62, -60, -50, -40, -20, },
  85         .c0 = { 512, 506, 500, 478, 456, 424, 392, 352, 312, },
  86 };
  87
  88 static const struct tidss_scale_coefs coef3_m32 = {
  89         .c1 = { 108, 92, 76, 62, 48, 36, 24, 140, 256, 236, 216, 198, 180, 162, 144, 126, },
  90         .c0 = { 296, 294, 292, 288, 284, 278, 272, 136, 256, },
  91 };
  92
  93 static const struct tidss_scale_coefs coef3_m26 = {
  94         .c1 = { 104, 90, 76, 60, 44, 32, 20, 138, 256, 236, 216, 198, 180, 160, 140, 122, },
  95         .c0 = { 304, 300, 296, 292, 288, 282, 276, 138, 256, },
  96 };
  97
  98 static const struct tidss_scale_coefs coef3_m22 = {
  99         .c1 = { 100, 84, 68, 54, 40, 30, 20, 138, 256, 236, 216, 196, 176, 156, 136, 118, },
 100         .c0 = { 312, 310, 308, 302, 296, 286, 276, 138, 256, },
 101 };
 102
 103 static const struct tidss_scale_coefs coef3_m19 = {
 104         .c1 = { 96, 80, 64, 50, 36, 26, 16, 136, 256, 236, 216, 194, 172, 152, 132, 114, },
 105         .c0 = { 320, 318, 316, 310, 304, 292, 280, 140, 256, },
 106 };
 107
 108 static const struct tidss_scale_coefs coef3_m16 = {
 109         .c1 = { 88, 72, 56, 44, 32, 22, 12, 134, 256, 234, 212, 190, 168, 148, 128, 108, },
 110         .c0 = { 336, 332, 328, 320, 312, 300, 288, 144, 256, },
 111 };
 112
 113 static const struct tidss_scale_coefs coef3_m14 = {
 114         .c1 = { 80, 64, 48, 36, 24, 16, 8, 132, 256, 232, 208, 186, 164, 142, 120, 100, },
 115         .c0 = { 352, 348, 344, 334, 324, 310, 296, 148, 256, },
 116 };
 117
 118 static const struct tidss_scale_coefs coef3_m13 = {
 119         .c1 = { 72, 56, 40, 30, 20, 12, 4, 130, 256, 232, 208, 184, 160, 136, 112, 92, },
 120         .c0 = { 368, 364, 360, 346, 332, 316, 300, 150, 256, },
 121 };
 122
 123 static const struct tidss_scale_coefs coef3_m12 = {
 124         .c1 = { 64, 50, 36, 26, 16, 10, 4, 130, 256, 230, 204, 178, 152, 128, 104, 84, },
 125         .c0 = { 384, 378, 372, 358, 344, 324, 304, 152, 256, },
 126 };
 127
 128 static const struct tidss_scale_coefs coef3_m11 = {
 129         .c1 = { 56, 40, 24, 16, 8, 4, 0, 128, 256, 228, 200, 172, 144, 120, 96, 76, },
 130         .c0 = { 400, 396, 392, 376, 360, 336, 312, 156, 256, },
 131 };
 132
 133 static const struct tidss_scale_coefs coef3_m10 = {
 134         .c1 = { 40, 26, 12, 6, 0, -2, -4, 126, 256, 226, 196, 166, 136, 110, 84, 62, },
 135         .c0 = { 432, 424, 416, 396, 376, 348, 320, 160, 256, },
 136 };
 137
 138 static const struct tidss_scale_coefs coef3_m9 = {
 139         .c1 = { 24, 12, 0, -4, -8, -8, -8, 124, 256, 222, 188, 154, 120, 92, 64, 44, },
 140         .c0 = { 464, 456, 448, 424, 400, 366, 332, 166, 256, },
 141 };
 142
 143 static const struct tidss_scale_coefs coef3_m8 = {
 144         .c1 = { 0, -8, -16, -16, -16, -12, -8, 124, 256, 214, 172, 134, 96, 66, 36, 18, },
 145         .c0 = { 512, 502, 492, 462, 432, 390, 348, 174, 256, },
 146 };
 147
 148 const struct tidss_scale_coefs *tidss_get_scale_coefs(struct device *dev,
 149                                                       u32 firinc,
 150                                                       bool five_taps)
 151 {
 152         int i;
 153         int inc;
 154         static const struct {
 155                 int mmin;
 156                 int mmax;
 157                 const struct tidss_scale_coefs *coef3;
 158                 const struct tidss_scale_coefs *coef5;
 159                 const char *name;
 160         } coefs[] = {
 161                 { 27, 32, &coef3_m32, &coef5_m32, "M32" },
 162                 { 23, 26, &coef3_m26, &coef5_m26, "M26" },
 163                 { 20, 22, &coef3_m22, &coef5_m22, "M22" },
 164                 { 17, 19, &coef3_m19, &coef5_m19, "M19" },
 165                 { 15, 16, &coef3_m16, &coef5_m16, "M16" },
 166                 { 14, 14, &coef3_m14, &coef5_m14, "M14" },
 167                 { 13, 13, &coef3_m13, &coef5_m13, "M13" },
 168                 { 12, 12, &coef3_m12, &coef5_m12, "M12" },
 169                 { 11, 11, &coef3_m11, &coef5_m11, "M11" },
 170                 { 10, 10, &coef3_m10, &coef5_m10, "M10" },
 171                 {  9,  9, &coef3_m9, &coef5_m9, "M9" },
 172                 {  4,  8, &coef3_m8, &coef5_m8, "M8" },
 173                 /*
 174                  * When upscaling more than two times, blockiness and outlines
 175                  * around the image are observed when M8 tables are used. M11,
 176                  * M16 and M19 tables are used to prevent this.
 177                  */
 178                 {  3,  3, &coef3_m11, &coef5_m11, "M11" },
 179                 {  2,  2, &coef3_m16, &coef5_m16, "M16" },
 180                 {  0,  1, &coef3_m19, &coef5_m19, "M19" },
 181         };
 182
 183         /*
 184          * inc is result of 0x200000 * in_size / out_size. This dividing
 185          * by 0x40000 scales it down to 8 * in_size / out_size. After
 186          * division the actual scaling factor is 8/inc.
 187          */
 188         inc = firinc / 0x40000;
 189         for (i = 0; i < ARRAY_SIZE(coefs); ++i) {
 190                 if (inc >= coefs[i].mmin && inc <= coefs[i].mmax) {
 191                         if (five_taps)
 192                                 return coefs[i].coef5;
 193                         else
 194                                 return coefs[i].coef3;
 195                 }
 196         }
 197
 198         dev_err(dev, "%s: Coefficients not found for firinc 0x%08x, inc %d\n",
 199                 __func__, firinc, inc);
 200
 201         return NULL;
 202 }