static bool nouveau_dsm_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
int has_dsm = 0;
int has_optimus;
int vga_count = 0;
bool guid_valid;
int retval;
bool ret = false;
/* lookup the MXM GUID */
guid_valid = mxm_wmi_supported();
if (guid_valid)
printk("MXM: GUID detected in BIOS\n");
/* now do DSM detection */
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
retval = nouveau_dsm_pci_probe(pdev);
if (retval & NOUVEAU_DSM_HAS_MUX)
has_dsm |= 1;
if (retval & NOUVEAU_DSM_HAS_OPT)
has_optimus = 1;
}
if (vga_count == 2 && has_dsm && guid_valid) {
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
ret = true;
}
if (has_optimus == 1)
nouveau_dsm_priv.optimus_detected = true;
return ret;
}
static bool nouveau_dsm_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
int has_dsm = 0;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_dsm |= (nouveau_dsm_pci_probe(pdev) == true);
}
if (vga_count == 2 && has_dsm) {
acpi_get_name(nouveau_dsm_priv.dsm_handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
return true;
}
return false;
}
