/**
* radeon_atpx_detect - detect whether we have PX
*
* Check if we have a PX system (all asics).
* Returns true if we have a PX system, false if not.
*/
static bool radeon_atpx_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
bool has_atpx = false;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
/* some newer PX laptops mark the dGPU as a non-VGA display device */
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
acpi_method_name);
radeon_atpx_priv.atpx_detected = true;
return true;
}
return false;
}
/**
* radeon_atpx_detect - detect whether we have PX
*
* Check if we have a PX system (all asics).
* Returns true if we have a PX system, false if not.
*/
static bool radeon_atpx_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
bool has_atpx = false;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
acpi_method_name);
radeon_atpx_priv.atpx_detected = true;
/*
* On some systems hotplug events are generated for the device
* being switched off when ATPX is executed. They cause ACPI
* hotplug to trigger and attempt to remove the device from
* the system, which causes it to break down. Prevent that from
* happening by setting the no_hotplug flag for the involved
* ACPI device objects.
*/
acpi_bus_no_hotplug(radeon_atpx_priv.dhandle);
acpi_bus_no_hotplug(radeon_atpx_priv.other_handle);
return true;
}
return false;
}
/**
* radeon_atpx_detect - detect whether we have PX
*
* Check if we have a PX system (all asics).
* Returns true if we have a PX system, false if not.
*/
static bool radeon_atpx_detect(void)
{
char acpi_method_name[255] = { 0 };
ACPI_BUFFER buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
bool has_atpx = false;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
AcpiGetName(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
DRM_INFO("VGA switcheroo: detected switching method %s handle\n",
acpi_method_name);
radeon_atpx_priv.atpx_detected = true;
return true;
}
return false;
}
