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// SPDX-License-Identifier: GPL-2.0
/*
* Intel ACPI functions
*
* _DSM related code stolen from nouveau_acpi.c.
*/
#include <linux/pci.h>
#include <linux/acpi.h>
#include "i915_drv.h"
#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
static const guid_t intel_dsm_guid =
GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
static char *intel_dsm_port_name(u8 id)
{
switch (id) {
case 0:
return "Reserved";
case 1:
return "Analog VGA";
case 2:
return "LVDS";
case 3:
return "Reserved";
case 4:
return "HDMI/DVI_B";
case 5:
return "HDMI/DVI_C";
case 6:
return "HDMI/DVI_D";
case 7:
return "DisplayPort_A";
case 8:
return "DisplayPort_B";
case 9:
return "DisplayPort_C";
case 0xa:
return "DisplayPort_D";
case 0xb:
case 0xc:
case 0xd:
return "Reserved";
case 0xe:
return "WiDi";
default:
return "bad type";
}
}
static char *intel_dsm_mux_type(u8 type)
{
switch (type) {
case 0:
return "unknown";
case 1:
return "No MUX, iGPU only";
case 2:
return "No MUX, dGPU only";
case 3:
return "MUXed between iGPU and dGPU";
default:
return "bad type";
}
}
static void intel_dsm_platform_mux_info(acpi_handle dhandle)
{
int i;
union acpi_object *pkg, *connector_count;
pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
NULL, ACPI_TYPE_PACKAGE);
if (!pkg) {
DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
return;
}
connector_count = &pkg->package.elements[0];
DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
(unsigned long long)connector_count->integer.value);
for (i = 1; i < pkg->package.count; i++) {
union acpi_object *obj = &pkg->package.elements[i];
union acpi_object *connector_id = &obj->package.elements[0];
union acpi_object *info = &obj->package.elements[1];
DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
(unsigned long long)connector_id->integer.value);
DRM_DEBUG_DRIVER(" port id: %s\n",
intel_dsm_port_name(info->buffer.pointer[0]));
DRM_DEBUG_DRIVER(" display mux info: %s\n",
intel_dsm_mux_type(info->buffer.pointer[1]));
DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
intel_dsm_mux_type(info->buffer.pointer[2]));
DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
intel_dsm_mux_type(info->buffer.pointer[3]));
}
ACPI_FREE(pkg);
}
static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
{
acpi_handle dhandle;
dhandle = ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return NULL;
if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
DRM_DEBUG_KMS("no _DSM method for intel device\n");
return NULL;
}
intel_dsm_platform_mux_info(dhandle);
return dhandle;
}
static bool intel_dsm_detect(void)
{
acpi_handle dhandle = NULL;
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
}
if (vga_count == 2 && dhandle) {
acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
return true;
}
return false;
}
void intel_register_dsm_handler(void)
{
if (!intel_dsm_detect())
return;
}
void intel_unregister_dsm_handler(void)
{
}
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