drivers/gpu/drm/ast/ast_dp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2021, ASPEED Technology Inc.
   3 // Authors: KuoHsiang Chou <[email protected]>
   4
   5 #include <linux/firmware.h>
   6 #include <linux/delay.h>
   7 #include <drm/drm_print.h>
   8 #include "ast_drv.h"
   9
  10 int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata)
  11 {
  12         struct ast_private *ast = to_ast_private(dev);
  13         u8 i = 0, j = 0;
  14
  15         /*
  16          * CRD1[b5]: DP MCU FW is executing
  17          * CRDC[b0]: DP link success
  18          * CRDF[b0]: DP HPD
  19          * CRE5[b0]: Host reading EDID process is done
  20          */
  21         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, ASTDP_MCU_FW_EXECUTING) &&
  22                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS) &&
  23                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD) &&
  24                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
  25                                                                 ASTDP_HOST_EDID_READ_DONE_MASK))) {
  26                 goto err_astdp_edid_not_ready;
  27         }
  28
  29         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
  30                                                         0x00);
  31
  32         for (i = 0; i < 32; i++) {
  33                 /*
  34                  * CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
  35                  */
  36                 ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE4,
  37                                        ASTDP_AND_CLEAR_MASK, (u8)i);
  38                 j = 0;
  39
  40                 /*
  41                  * CRD7[b0]: valid flag for EDID
  42                  * CRD6[b0]: mirror read pointer for EDID
  43                  */
  44                 while ((ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD7,
  45                                 ASTDP_EDID_VALID_FLAG_MASK) != 0x01) ||
  46                         (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD6,
  47                                                 ASTDP_EDID_READ_POINTER_MASK) != i)) {
  48                         /*
  49                          * Delay are getting longer with each retry.
  50                          * 1. The Delays are often 2 loops when users request "Display Settings"
  51                          *        of right-click of mouse.
  52                          * 2. The Delays are often longer a lot when system resume from S3/S4.
  53                          */
  54                         mdelay(j+1);
  55
  56                         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1,
  57                                                         ASTDP_MCU_FW_EXECUTING) &&
  58                                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC,
  59                                                         ASTDP_LINK_SUCCESS) &&
  60                                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD))) {
  61                                 goto err_astdp_jump_out_loop_of_edid;
  62                         }
  63
  64                         j++;
  65                         if (j > 200)
  66                                 goto err_astdp_jump_out_loop_of_edid;
  67                 }
  68
  69                 *(ediddata) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT,
  70                                                         0xD8, ASTDP_EDID_READ_DATA_MASK);
  71                 *(ediddata + 1) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD9,
  72                                                                 ASTDP_EDID_READ_DATA_MASK);
  73                 *(ediddata + 2) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDA,
  74                                                                 ASTDP_EDID_READ_DATA_MASK);
  75                 *(ediddata + 3) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDB,
  76                                                                 ASTDP_EDID_READ_DATA_MASK);
  77
  78                 if (i == 31) {
  79                         /*
  80                          * For 128-bytes EDID_1.3,
  81                          * 1. Add the value of Bytes-126 to Bytes-127.
  82                          *              The Bytes-127 is Checksum. Sum of all 128bytes should
  83                          *              equal 0 (mod 256).
  84                          * 2. Modify Bytes-126 to be 0.
  85                          *              The Bytes-126 indicates the Number of extensions to
  86                          *              follow. 0 represents noextensions.
  87                          */
  88                         *(ediddata + 3) = *(ediddata + 3) + *(ediddata + 2);
  89                         *(ediddata + 2) = 0;
  90                 }
  91
  92                 ediddata += 4;
  93         }
  94
  95         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
  96                                                         ASTDP_HOST_EDID_READ_DONE);
  97
  98         return 0;
  99
 100 err_astdp_jump_out_loop_of_edid:
 101         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
 102                                                         (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
 103                                                         ASTDP_HOST_EDID_READ_DONE);
 104         return (~(j+256) + 1);
 105
 106 err_astdp_edid_not_ready:
 107         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, ASTDP_MCU_FW_EXECUTING)))
 108                 return (~0xD1 + 1);
 109         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS)))
 110                 return (~0xDC + 1);
 111         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD)))
 112                 return (~0xDF + 1);
 113         if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, ASTDP_HOST_EDID_READ_DONE_MASK)))
 114                 return (~0xE5 + 1);
 115
 116         return  0;
 117 }
 118
 119 /*
 120  * Launch Aspeed DP
 121  */
 122 void ast_dp_launch(struct drm_device *dev, u8 bPower)
 123 {
 124         u32 i = 0, j = 0, WaitCount = 1;
 125         u8 bDPTX = 0;
 126         u8 bDPExecute = 1;
 127
 128         struct ast_private *ast = to_ast_private(dev);
 129         // S3 come back, need more time to wait BMC ready.
 130         if (bPower)
 131                 WaitCount = 300;
 132
 133
 134         // Wait total count by different condition.
 135         for (j = 0; j < WaitCount; j++) {
 136                 bDPTX = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, TX_TYPE_MASK);
 137
 138                 if (bDPTX)
 139                         break;
 140
 141                 msleep(100);
 142         }
 143
 144         // 0xE : ASTDP with DPMCU FW handling
 145         if (bDPTX == ASTDP_DPMCU_TX) {
 146                 // Wait one second then timeout.
 147                 i = 0;
 148
 149                 while (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, COPROCESSOR_LAUNCH) !=
 150                         COPROCESSOR_LAUNCH) {
 151                         i++;
 152                         // wait 100 ms
 153                         msleep(100);
 154
 155                         if (i >= 10) {
 156                                 // DP would not be ready.
 157                                 bDPExecute = 0;
 158                                 break;
 159                         }
 160                 }
 161
 162                 if (bDPExecute)
 163                         ast->tx_chip_types |= BIT(AST_TX_ASTDP);
 164
 165                 ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
 166                                                         (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
 167                                                         ASTDP_HOST_EDID_READ_DONE);
 168         }
 169 }
 170
 171
 172
 173 void ast_dp_power_on_off(struct drm_device *dev, bool on)
 174 {
 175         struct ast_private *ast = to_ast_private(dev);
 176         // Read and Turn off DP PHY sleep
 177         u8 bE3 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, AST_DP_VIDEO_ENABLE);
 178
 179         // Turn on DP PHY sleep
 180         if (!on)
 181                 bE3 |= AST_DP_PHY_SLEEP;
 182
 183         // DP Power on/off
 184         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, (u8) ~AST_DP_PHY_SLEEP, bE3);
 185 }
 186
 187
 188
 189 void ast_dp_set_on_off(struct drm_device *dev, bool on)
 190 {
 191         struct ast_private *ast = to_ast_private(dev);
 192         u8 video_on_off = on;
 193
 194         // Video On/Off
 195         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, (u8) ~AST_DP_VIDEO_ENABLE, on);
 196
 197         // If DP plug in and link successful then check video on / off status
 198         if (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS) &&
 199                 ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD)) {
 200                 video_on_off <<= 4;
 201                 while (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF,
 202                                                 ASTDP_MIRROR_VIDEO_ENABLE) != video_on_off) {
 203                         // wait 1 ms
 204                         mdelay(1);
 205                 }
 206         }
 207 }
 208
 209 void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode)
 210 {
 211         struct ast_private *ast = to_ast_private(crtc->dev);
 212
 213         u32 ulRefreshRateIndex;
 214         u8 ModeIdx;
 215
 216         ulRefreshRateIndex = vbios_mode->enh_table->refresh_rate_index - 1;
 217
 218         switch (crtc->mode.crtc_hdisplay) {
 219         case 320:
 220                 ModeIdx = ASTDP_320x240_60;
 221                 break;
 222         case 400:
 223                 ModeIdx = ASTDP_400x300_60;
 224                 break;
 225         case 512:
 226                 ModeIdx = ASTDP_512x384_60;
 227                 break;
 228         case 640:
 229                 ModeIdx = (ASTDP_640x480_60 + (u8) ulRefreshRateIndex);
 230                 break;
 231         case 800:
 232                 ModeIdx = (ASTDP_800x600_56 + (u8) ulRefreshRateIndex);
 233                 break;
 234         case 1024:
 235                 ModeIdx = (ASTDP_1024x768_60 + (u8) ulRefreshRateIndex);
 236                 break;
 237         case 1152:
 238                 ModeIdx = ASTDP_1152x864_75;
 239                 break;
 240         case 1280:
 241                 if (crtc->mode.crtc_vdisplay == 800)
 242                         ModeIdx = (ASTDP_1280x800_60_RB - (u8) ulRefreshRateIndex);
 243                 else            // 1024
 244                         ModeIdx = (ASTDP_1280x1024_60 + (u8) ulRefreshRateIndex);
 245                 break;
 246         case 1360:
 247         case 1366:
 248                 ModeIdx = ASTDP_1366x768_60;
 249                 break;
 250         case 1440:
 251                 ModeIdx = (ASTDP_1440x900_60_RB - (u8) ulRefreshRateIndex);
 252                 break;
 253         case 1600:
 254                 if (crtc->mode.crtc_vdisplay == 900)
 255                         ModeIdx = (ASTDP_1600x900_60_RB - (u8) ulRefreshRateIndex);
 256                 else            //1200
 257                         ModeIdx = ASTDP_1600x1200_60;
 258                 break;
 259         case 1680:
 260                 ModeIdx = (ASTDP_1680x1050_60_RB - (u8) ulRefreshRateIndex);
 261                 break;
 262         case 1920:
 263                 if (crtc->mode.crtc_vdisplay == 1080)
 264                         ModeIdx = ASTDP_1920x1080_60;
 265                 else            //1200
 266                         ModeIdx = ASTDP_1920x1200_60;
 267                 break;
 268         default:
 269                 return;
 270         }
 271
 272         /*
 273          * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
 274          * CRE1[7:0]: MISC1 (default: 0x00)
 275          * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
 276          */
 277         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE0, ASTDP_AND_CLEAR_MASK,
 278                                ASTDP_MISC0_24bpp);
 279         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE1, ASTDP_AND_CLEAR_MASK, ASTDP_MISC1);
 280         ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE2, ASTDP_AND_CLEAR_MASK, ModeIdx);
 281 }