src/mainboard/lenovo/t530/early_init.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <stdint.h>
   4 #include <device/pci_ops.h>
   5 #include <device/pci_def.h>
   6 #include <northbridge/intel/sandybridge/raminit_native.h>
   7 #include <southbridge/intel/bd82x6x/pch.h>
   8 #include <northbridge/intel/sandybridge/sandybridge.h>
   9 #include <drivers/lenovo/hybrid_graphics/hybrid_graphics.h>
  10 #include <device/device.h>
  11
  12 static void hybrid_graphics_init(void)
  13 {
  14         bool peg, igd;
  15         u32 reg32;
  16
  17         early_hybrid_graphics(&igd, &peg);
  18
  19         if (peg && igd)
  20                 return;
  21
  22         /* Hide disabled devices */
  23         reg32 = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN);
  24         reg32 &= ~(DEVEN_PEG10 | DEVEN_IGD);
  25
  26         if (peg)
  27                 reg32 |= DEVEN_PEG10;
  28
  29         if (igd)
  30                 reg32 |= DEVEN_IGD;
  31         else
  32                 /* Disable IGD VGA decode, no GTT or GFX stolen */
  33                 pci_write_config16(PCI_DEV(0, 0, 0), GGC, 2);
  34
  35         pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, reg32);
  36 }
  37
  38 void mainboard_early_init(int s3resume)
  39 {
  40         hybrid_graphics_init();
  41 }