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