src/add-ons/accelerants/common/dp.cpp

   1 /*
   2  * Copyright 2012-2016, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *      Alexander von Gluck, kallisti5@unixzen.com
   7  */
   8
   9
  10 #include "dp.h"
  11
  12
  13 #define TRACE_DISPLAY
  14 #ifdef TRACE_DISPLAY
  15 extern "C" void _sPrintf(const char* format, ...);
  16 #   define TRACE(x...) _sPrintf("dp_common: " x)
  17 #else
  18 #   define TRACE(x...) ;
  19 #endif
  20
  21 #define ERROR(x...) _sPrintf("dp_common: " x)
  22
  23
  24 uint32
  25 dp_encode_link_rate(uint32 linkRate)
  26 {
  27         switch (linkRate) {
  28                 case 162000:
  29                         // 1.62 Ghz
  30                         return DP_LINK_RATE_162;
  31                 case 270000:
  32                         // 2.7 Ghz
  33                         return DP_LINK_RATE_270;
  34                 case 540000:
  35                         // 5.4 Ghz
  36                         return DP_LINK_RATE_540;
  37         }
  38
  39         ERROR("%s: Unknown DisplayPort Link Rate! (0x%" B_PRIX32 ")\n",
  40                 __func__, linkRate);
  41         return DP_LINK_RATE_162;
  42 }
  43
  44
  45 uint32
  46 dp_decode_link_rate(uint32 rawLinkRate)
  47 {
  48         switch (rawLinkRate) {
  49                 case DP_LINK_RATE_162:
  50                         return 162000;
  51                 case DP_LINK_RATE_270:
  52                         return 270000;
  53                 case DP_LINK_RATE_540:
  54                         return 540000;
  55         }
  56         ERROR("%s: Unknown DisplayPort Link Rate! (0x%" B_PRIX32 ")\n",
  57                 __func__, rawLinkRate);
  58         return 162000;
  59 }
  60
  61
  62 uint32
  63 dp_get_pixel_clock_max(int linkRate, int laneCount, int bpp)
  64 {
  65         return (linkRate * laneCount * 8) / bpp;
  66 }