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Viewing changes to drivers/gpu/drm/i915/intel_acpi.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/gpu/drm/i915/intel_acpi.c
 
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>
 
9
#include <acpi/acpi_drivers.h>
 
10
 
 
11
#include "drmP.h"
 
12
 
 
13
#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
 
14
 
 
15
#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
 
16
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
 
17
 
 
18
static struct intel_dsm_priv {
 
19
        acpi_handle dhandle;
 
20
} intel_dsm_priv;
 
21
 
 
22
static const u8 intel_dsm_guid[] = {
 
23
        0xd3, 0x73, 0xd8, 0x7e,
 
24
        0xd0, 0xc2,
 
25
        0x4f, 0x4e,
 
26
        0xa8, 0x54,
 
27
        0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
 
28
};
 
29
 
 
30
static int intel_dsm(acpi_handle handle, int func, int arg)
 
31
{
 
32
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 
33
        struct acpi_object_list input;
 
34
        union acpi_object params[4];
 
35
        union acpi_object *obj;
 
36
        u32 result;
 
37
        int ret = 0;
 
38
 
 
39
        input.count = 4;
 
40
        input.pointer = params;
 
41
        params[0].type = ACPI_TYPE_BUFFER;
 
42
        params[0].buffer.length = sizeof(intel_dsm_guid);
 
43
        params[0].buffer.pointer = (char *)intel_dsm_guid;
 
44
        params[1].type = ACPI_TYPE_INTEGER;
 
45
        params[1].integer.value = INTEL_DSM_REVISION_ID;
 
46
        params[2].type = ACPI_TYPE_INTEGER;
 
47
        params[2].integer.value = func;
 
48
        params[3].type = ACPI_TYPE_INTEGER;
 
49
        params[3].integer.value = arg;
 
50
 
 
51
        ret = acpi_evaluate_object(handle, "_DSM", &input, &output);
 
52
        if (ret) {
 
53
                DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
 
54
                return ret;
 
55
        }
 
56
 
 
57
        obj = (union acpi_object *)output.pointer;
 
58
 
 
59
        result = 0;
 
60
        switch (obj->type) {
 
61
        case ACPI_TYPE_INTEGER:
 
62
                result = obj->integer.value;
 
63
                break;
 
64
 
 
65
        case ACPI_TYPE_BUFFER:
 
66
                if (obj->buffer.length == 4) {
 
67
                        result = (obj->buffer.pointer[0] |
 
68
                                (obj->buffer.pointer[1] <<  8) |
 
69
                                (obj->buffer.pointer[2] << 16) |
 
70
                                (obj->buffer.pointer[3] << 24));
 
71
                        break;
 
72
                }
 
73
        default:
 
74
                ret = -EINVAL;
 
75
                break;
 
76
        }
 
77
        if (result == 0x80000002)
 
78
                ret = -ENODEV;
 
79
 
 
80
        kfree(output.pointer);
 
81
        return ret;
 
82
}
 
83
 
 
84
static char *intel_dsm_port_name(u8 id)
 
85
{
 
86
        switch (id) {
 
87
        case 0:
 
88
                return "Reserved";
 
89
        case 1:
 
90
                return "Analog VGA";
 
91
        case 2:
 
92
                return "LVDS";
 
93
        case 3:
 
94
                return "Reserved";
 
95
        case 4:
 
96
                return "HDMI/DVI_B";
 
97
        case 5:
 
98
                return "HDMI/DVI_C";
 
99
        case 6:
 
100
                return "HDMI/DVI_D";
 
101
        case 7:
 
102
                return "DisplayPort_A";
 
103
        case 8:
 
104
                return "DisplayPort_B";
 
105
        case 9:
 
106
                return "DisplayPort_C";
 
107
        case 0xa:
 
108
                return "DisplayPort_D";
 
109
        case 0xb:
 
110
        case 0xc:
 
111
        case 0xd:
 
112
                return "Reserved";
 
113
        case 0xe:
 
114
                return "WiDi";
 
115
        default:
 
116
                return "bad type";
 
117
        }
 
118
}
 
119
 
 
120
static char *intel_dsm_mux_type(u8 type)
 
121
{
 
122
        switch (type) {
 
123
        case 0:
 
124
                return "unknown";
 
125
        case 1:
 
126
                return "No MUX, iGPU only";
 
127
        case 2:
 
128
                return "No MUX, dGPU only";
 
129
        case 3:
 
130
                return "MUXed between iGPU and dGPU";
 
131
        default:
 
132
                return "bad type";
 
133
        }
 
134
}
 
135
 
 
136
static void intel_dsm_platform_mux_info(void)
 
137
{
 
138
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 
139
        struct acpi_object_list input;
 
140
        union acpi_object params[4];
 
141
        union acpi_object *pkg;
 
142
        int i, ret;
 
143
 
 
144
        input.count = 4;
 
145
        input.pointer = params;
 
146
        params[0].type = ACPI_TYPE_BUFFER;
 
147
        params[0].buffer.length = sizeof(intel_dsm_guid);
 
148
        params[0].buffer.pointer = (char *)intel_dsm_guid;
 
149
        params[1].type = ACPI_TYPE_INTEGER;
 
150
        params[1].integer.value = INTEL_DSM_REVISION_ID;
 
151
        params[2].type = ACPI_TYPE_INTEGER;
 
152
        params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
 
153
        params[3].type = ACPI_TYPE_INTEGER;
 
154
        params[3].integer.value = 0;
 
155
 
 
156
        ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
 
157
                                   &output);
 
158
        if (ret) {
 
159
                DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
 
160
                goto out;
 
161
        }
 
162
 
 
163
        pkg = (union acpi_object *)output.pointer;
 
164
 
 
165
        if (pkg->type == ACPI_TYPE_PACKAGE) {
 
166
                union acpi_object *connector_count = &pkg->package.elements[0];
 
167
                DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
 
168
                          (unsigned long long)connector_count->integer.value);
 
169
                for (i = 1; i < pkg->package.count; i++) {
 
170
                        union acpi_object *obj = &pkg->package.elements[i];
 
171
                        union acpi_object *connector_id =
 
172
                                &obj->package.elements[0];
 
173
                        union acpi_object *info = &obj->package.elements[1];
 
174
                        DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
 
175
                                  (unsigned long long)connector_id->integer.value);
 
176
                        DRM_DEBUG_DRIVER("  port id: %s\n",
 
177
                               intel_dsm_port_name(info->buffer.pointer[0]));
 
178
                        DRM_DEBUG_DRIVER("  display mux info: %s\n",
 
179
                               intel_dsm_mux_type(info->buffer.pointer[1]));
 
180
                        DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
 
181
                               intel_dsm_mux_type(info->buffer.pointer[2]));
 
182
                        DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
 
183
                               intel_dsm_mux_type(info->buffer.pointer[3]));
 
184
                }
 
185
        } else {
 
186
                DRM_ERROR("MUX INFO call failed\n");
 
187
        }
 
188
 
 
189
out:
 
190
        kfree(output.pointer);
 
191
}
 
192
 
 
193
static bool intel_dsm_pci_probe(struct pci_dev *pdev)
 
194
{
 
195
        acpi_handle dhandle, intel_handle;
 
196
        acpi_status status;
 
197
        int ret;
 
198
 
 
199
        dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 
200
        if (!dhandle)
 
201
                return false;
 
202
 
 
203
        status = acpi_get_handle(dhandle, "_DSM", &intel_handle);
 
204
        if (ACPI_FAILURE(status)) {
 
205
                DRM_DEBUG_KMS("no _DSM method for intel device\n");
 
206
                return false;
 
207
        }
 
208
 
 
209
        ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS, 0);
 
210
        if (ret < 0) {
 
211
                DRM_ERROR("failed to get supported _DSM functions\n");
 
212
                return false;
 
213
        }
 
214
 
 
215
        intel_dsm_priv.dhandle = dhandle;
 
216
 
 
217
        intel_dsm_platform_mux_info();
 
218
        return true;
 
219
}
 
220
 
 
221
static bool intel_dsm_detect(void)
 
222
{
 
223
        char acpi_method_name[255] = { 0 };
 
224
        struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 
225
        struct pci_dev *pdev = NULL;
 
226
        bool has_dsm = false;
 
227
        int vga_count = 0;
 
228
 
 
229
        while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 
230
                vga_count++;
 
231
                has_dsm |= intel_dsm_pci_probe(pdev);
 
232
        }
 
233
 
 
234
        if (vga_count == 2 && has_dsm) {
 
235
                acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
 
236
                DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
 
237
                                 acpi_method_name);
 
238
                return true;
 
239
        }
 
240
 
 
241
        return false;
 
242
}
 
243
 
 
244
void intel_register_dsm_handler(void)
 
245
{
 
246
        if (!intel_dsm_detect())
 
247
                return;
 
248
}
 
249
 
 
250
void intel_unregister_dsm_handler(void)
 
251
{
 
252
}