src/mainboard/lenovo/t430/early_init.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/pci_ops.h>
   4 #include <device/pci_def.h>
   5 #include <ec/lenovo/pmh7/pmh7.h>
   6 #include <drivers/lenovo/hybrid_graphics/hybrid_graphics.h>
   7 #include <northbridge/intel/sandybridge/sandybridge.h>
   8
   9 static void hybrid_graphics_init(void)
  10 {
  11         bool peg, igd;
  12         u32 reg32;
  13
  14         early_hybrid_graphics(&igd, &peg);
  15
  16         if (peg && igd)
  17                 return;
  18
  19         /* Hide disabled devices */
  20         reg32 = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN);
  21         reg32 &= ~(DEVEN_PEG10 | DEVEN_IGD);
  22
  23         if (peg)
  24                 reg32 |= DEVEN_PEG10;
  25
  26         if (igd)
  27                 reg32 |= DEVEN_IGD;
  28         else
  29                 /* Disable IGD VGA decode, no GTT or GFX stolen */
  30                 pci_write_config16(PCI_DEV(0, 0, 0), GGC, 2);
  31
  32         pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, reg32);
  33 }
  34
  35 void mainboard_early_init(int s3resume)
  36 {
  37         hybrid_graphics_init();
  38 }