src/mainboard/lenovo/t530/early_init.c

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