Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Intel ACPI functions |
| 3 | * |
| 4 | * _DSM related code stolen from nouveau_acpi.c. |
| 5 | */ |
| 6 | #include <linux/pci.h> |
| 7 | #include <linux/acpi.h> |
| 8 | #include <linux/vga_switcheroo.h> |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 9 | #include <drm/drmP.h> |
Ben Widawsky | c43b563 | 2012-04-16 14:07:40 -0700 | [diff] [blame] | 10 | #include "i915_drv.h" |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 11 | |
| 12 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 13 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ |
| 14 | |
| 15 | static struct intel_dsm_priv { |
| 16 | acpi_handle dhandle; |
| 17 | } intel_dsm_priv; |
| 18 | |
| 19 | static const u8 intel_dsm_guid[] = { |
| 20 | 0xd3, 0x73, 0xd8, 0x7e, |
| 21 | 0xd0, 0xc2, |
| 22 | 0x4f, 0x4e, |
| 23 | 0xa8, 0x54, |
| 24 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c |
| 25 | }; |
| 26 | |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 27 | static char *intel_dsm_port_name(u8 id) |
| 28 | { |
| 29 | switch (id) { |
| 30 | case 0: |
| 31 | return "Reserved"; |
| 32 | case 1: |
| 33 | return "Analog VGA"; |
| 34 | case 2: |
| 35 | return "LVDS"; |
| 36 | case 3: |
| 37 | return "Reserved"; |
| 38 | case 4: |
| 39 | return "HDMI/DVI_B"; |
| 40 | case 5: |
| 41 | return "HDMI/DVI_C"; |
| 42 | case 6: |
| 43 | return "HDMI/DVI_D"; |
| 44 | case 7: |
| 45 | return "DisplayPort_A"; |
| 46 | case 8: |
| 47 | return "DisplayPort_B"; |
| 48 | case 9: |
| 49 | return "DisplayPort_C"; |
| 50 | case 0xa: |
| 51 | return "DisplayPort_D"; |
| 52 | case 0xb: |
| 53 | case 0xc: |
| 54 | case 0xd: |
| 55 | return "Reserved"; |
| 56 | case 0xe: |
| 57 | return "WiDi"; |
| 58 | default: |
| 59 | return "bad type"; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | static char *intel_dsm_mux_type(u8 type) |
| 64 | { |
| 65 | switch (type) { |
| 66 | case 0: |
| 67 | return "unknown"; |
| 68 | case 1: |
| 69 | return "No MUX, iGPU only"; |
| 70 | case 2: |
| 71 | return "No MUX, dGPU only"; |
| 72 | case 3: |
| 73 | return "MUXed between iGPU and dGPU"; |
| 74 | default: |
| 75 | return "bad type"; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | static void intel_dsm_platform_mux_info(void) |
| 80 | { |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 81 | int i; |
| 82 | union acpi_object *pkg, *connector_count; |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 83 | |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 84 | pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, |
| 85 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, |
| 86 | NULL, ACPI_TYPE_PACKAGE); |
| 87 | if (!pkg) { |
| 88 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); |
| 89 | return; |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 92 | connector_count = &pkg->package.elements[0]; |
| 93 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", |
| 94 | (unsigned long long)connector_count->integer.value); |
| 95 | for (i = 1; i < pkg->package.count; i++) { |
| 96 | union acpi_object *obj = &pkg->package.elements[i]; |
| 97 | union acpi_object *connector_id = &obj->package.elements[0]; |
| 98 | union acpi_object *info = &obj->package.elements[1]; |
| 99 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", |
| 100 | (unsigned long long)connector_id->integer.value); |
| 101 | DRM_DEBUG_DRIVER(" port id: %s\n", |
| 102 | intel_dsm_port_name(info->buffer.pointer[0])); |
| 103 | DRM_DEBUG_DRIVER(" display mux info: %s\n", |
| 104 | intel_dsm_mux_type(info->buffer.pointer[1])); |
| 105 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", |
| 106 | intel_dsm_mux_type(info->buffer.pointer[2])); |
| 107 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", |
| 108 | intel_dsm_mux_type(info->buffer.pointer[3])); |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 111 | ACPI_FREE(pkg); |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 114 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
| 115 | { |
Zhang Rui | 2a3ca14 | 2013-09-03 08:31:59 +0800 | [diff] [blame] | 116 | acpi_handle dhandle; |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 117 | |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame] | 118 | dhandle = ACPI_HANDLE(&pdev->dev); |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 119 | if (!dhandle) |
| 120 | return false; |
| 121 | |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 122 | if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, |
| 123 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 124 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); |
| 125 | return false; |
| 126 | } |
| 127 | |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 128 | intel_dsm_priv.dhandle = dhandle; |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 129 | intel_dsm_platform_mux_info(); |
Jiang Liu | d5c3d79 | 2013-12-19 20:38:20 +0800 | [diff] [blame] | 130 | |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 131 | return true; |
| 132 | } |
| 133 | |
| 134 | static bool intel_dsm_detect(void) |
| 135 | { |
| 136 | char acpi_method_name[255] = { 0 }; |
| 137 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; |
| 138 | struct pci_dev *pdev = NULL; |
| 139 | bool has_dsm = false; |
| 140 | int vga_count = 0; |
| 141 | |
| 142 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { |
| 143 | vga_count++; |
| 144 | has_dsm |= intel_dsm_pci_probe(pdev); |
| 145 | } |
| 146 | |
| 147 | if (vga_count == 2 && has_dsm) { |
| 148 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); |
Lukas Wunner | 5389e91 | 2015-09-04 21:06:15 +0200 | [diff] [blame] | 149 | DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 150 | acpi_method_name); |
| 151 | return true; |
| 152 | } |
| 153 | |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | void intel_register_dsm_handler(void) |
| 158 | { |
| 159 | if (!intel_dsm_detect()) |
| 160 | return; |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | void intel_unregister_dsm_handler(void) |
| 164 | { |
Jesse Barnes | 723bfd7 | 2010-10-07 16:01:13 -0700 | [diff] [blame] | 165 | } |