drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c

   1 #include "hdmi.h"
   2
   3 void pack_hdmi_infoframe(struct packed_hdmi_infoframe *packed_frame,
   4                          u8 *raw_frame, ssize_t len)
   5 {
   6         u32 header = 0;
   7         u32 subpack0_low = 0;
   8         u32 subpack0_high = 0;
   9         u32 subpack1_low = 0;
  10         u32 subpack1_high = 0;
  11
  12         switch (len) {
  13                 /*
  14                  * "When in doubt, use brute force."
  15                  *     -- Ken Thompson.
  16                  */
  17         default:
  18                 /*
  19                  * We presume that no valid frame is longer than 17
  20                  * octets, including header...  And truncate to that
  21                  * if it's longer.
  22                  */
  23         case 17:
  24                 subpack1_high = (raw_frame[16] << 16);
  25         case 16:
  26                 subpack1_high |= (raw_frame[15] << 8);
  27         case 15:
  28                 subpack1_high |= raw_frame[14];
  29         case 14:
  30                 subpack1_low = (raw_frame[13] << 24);
  31         case 13:
  32                 subpack1_low |= (raw_frame[12] << 16);
  33         case 12:
  34                 subpack1_low |= (raw_frame[11] << 8);
  35         case 11:
  36                 subpack1_low |= raw_frame[10];
  37         case 10:
  38                 subpack0_high = (raw_frame[9] << 16);
  39         case 9:
  40                 subpack0_high |= (raw_frame[8] << 8);
  41         case 8:
  42                 subpack0_high |= raw_frame[7];
  43         case 7:
  44                 subpack0_low = (raw_frame[6] << 24);
  45         case 6:
  46                 subpack0_low |= (raw_frame[5] << 16);
  47         case 5:
  48                 subpack0_low |= (raw_frame[4] << 8);
  49         case 4:
  50                 subpack0_low |= raw_frame[3];
  51         case 3:
  52                 header = (raw_frame[2] << 16);
  53         case 2:
  54                 header |= (raw_frame[1] << 8);
  55         case 1:
  56                 header |= raw_frame[0];
  57         case 0:
  58                 break;
  59         }
  60
  61         packed_frame->header = header;
  62         packed_frame->subpack0_low = subpack0_low;
  63         packed_frame->subpack0_high = subpack0_high;
  64         packed_frame->subpack1_low = subpack1_low;
  65         packed_frame->subpack1_high = subpack1_high;
  66 }