2 #include <linux/acpi.h>
3 #include <linux/slab.h>
4 #include <acpi/acpi_drivers.h>
5 #include <acpi/acpi_bus.h>
6 #include <acpi/video.h>
8 #include <linux/mxm-wmi.h>
12 #include "drm_sarea.h"
13 #include "drm_crtc_helper.h"
14 #include "nouveau_drv.h"
15 #include "nouveau_drm.h"
16 #include "nv50_display.h"
17 #include "nouveau_connector.h"
19 #include <linux/vga_switcheroo.h>
21 #define NOUVEAU_DSM_LED 0x02
22 #define NOUVEAU_DSM_LED_STATE 0x00
23 #define NOUVEAU_DSM_LED_OFF 0x10
24 #define NOUVEAU_DSM_LED_STAMINA 0x11
25 #define NOUVEAU_DSM_LED_SPEED 0x12
27 #define NOUVEAU_DSM_POWER 0x03
28 #define NOUVEAU_DSM_POWER_STATE 0x00
29 #define NOUVEAU_DSM_POWER_SPEED 0x01
30 #define NOUVEAU_DSM_POWER_STAMINA 0x02
32 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
33 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
35 static struct nouveau_dsm_priv {
37 bool optimus_detected;
39 acpi_handle rom_handle;
42 #define NOUVEAU_DSM_HAS_MUX 0x1
43 #define NOUVEAU_DSM_HAS_OPT 0x2
45 static const char nouveau_dsm_muid[] = {
46 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
47 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
50 static const char nouveau_op_dsm_muid[] = {
51 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
52 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
55 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
57 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
58 struct acpi_object_list input;
59 union acpi_object params[4];
60 union acpi_object *obj;
65 input.pointer = params;
66 params[0].type = ACPI_TYPE_BUFFER;
67 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
68 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
69 params[1].type = ACPI_TYPE_INTEGER;
70 params[1].integer.value = 0x00000100;
71 params[2].type = ACPI_TYPE_INTEGER;
72 params[2].integer.value = func;
73 params[3].type = ACPI_TYPE_BUFFER;
74 params[3].buffer.length = 4;
75 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
76 for (i = 0; i < 4; i++)
77 args_buff[i] = (arg >> i * 8) & 0xFF;
78 params[3].buffer.pointer = args_buff;
80 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
82 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
86 obj = (union acpi_object *)output.pointer;
88 if (obj->type == ACPI_TYPE_INTEGER)
89 if (obj->integer.value == 0x80000002) {
93 if (obj->type == ACPI_TYPE_BUFFER) {
94 if (obj->buffer.length == 4 && result) {
96 *result |= obj->buffer.pointer[0];
97 *result |= (obj->buffer.pointer[1] << 8);
98 *result |= (obj->buffer.pointer[2] << 16);
99 *result |= (obj->buffer.pointer[3] << 24);
103 kfree(output.pointer);
107 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
109 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
110 struct acpi_object_list input;
111 union acpi_object params[4];
112 union acpi_object *obj;
116 input.pointer = params;
117 params[0].type = ACPI_TYPE_BUFFER;
118 params[0].buffer.length = sizeof(nouveau_dsm_muid);
119 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
120 params[1].type = ACPI_TYPE_INTEGER;
121 params[1].integer.value = 0x00000102;
122 params[2].type = ACPI_TYPE_INTEGER;
123 params[2].integer.value = func;
124 params[3].type = ACPI_TYPE_INTEGER;
125 params[3].integer.value = arg;
127 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
129 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
133 obj = (union acpi_object *)output.pointer;
135 if (obj->type == ACPI_TYPE_INTEGER)
136 if (obj->integer.value == 0x80000002)
139 if (obj->type == ACPI_TYPE_BUFFER) {
140 if (obj->buffer.length == 4 && result) {
142 *result |= obj->buffer.pointer[0];
143 *result |= (obj->buffer.pointer[1] << 8);
144 *result |= (obj->buffer.pointer[2] << 16);
145 *result |= (obj->buffer.pointer[3] << 24);
149 kfree(output.pointer);
153 /* Returns 1 if a DSM function is usable and 0 otherwise */
154 static int nouveau_test_dsm(acpi_handle test_handle,
155 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
160 /* Function 0 returns a Buffer containing available functions. The args
161 * parameter is ignored for function 0, so just put 0 in it */
162 if (dsm_func(test_handle, 0, 0, &result))
165 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
166 * the n-th bit is enabled, function n is supported */
167 return result & 1 && result & (1 << sfnc);
170 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
172 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
173 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
174 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
177 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
180 if (state == VGA_SWITCHEROO_ON)
181 arg = NOUVEAU_DSM_POWER_SPEED;
183 arg = NOUVEAU_DSM_POWER_STAMINA;
184 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
188 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
190 /* perhaps the _DSM functions are mutually exclusive, but prepare for
192 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
194 if (id == VGA_SWITCHEROO_IGD)
195 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
197 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
200 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
201 enum vga_switcheroo_state state)
203 if (id == VGA_SWITCHEROO_IGD)
206 /* Optimus laptops have the card already disabled in
207 * nouveau_switcheroo_set_state */
208 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
211 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
214 static int nouveau_dsm_init(void)
219 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
221 /* easy option one - intel vendor ID means Integrated */
222 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
223 return VGA_SWITCHEROO_IGD;
225 /* is this device on Bus 0? - this may need improving */
226 if (pdev->bus->number == 0)
227 return VGA_SWITCHEROO_IGD;
229 return VGA_SWITCHEROO_DIS;
232 static struct vga_switcheroo_handler nouveau_dsm_handler = {
233 .switchto = nouveau_dsm_switchto,
234 .power_state = nouveau_dsm_power_state,
235 .init = nouveau_dsm_init,
236 .get_client_id = nouveau_dsm_get_client_id,
239 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
241 acpi_handle dhandle, nvidia_handle;
245 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
249 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
250 if (ACPI_FAILURE(status)) {
254 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
255 retval |= NOUVEAU_DSM_HAS_MUX;
257 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
258 NOUVEAU_DSM_OPTIMUS_FN))
259 retval |= NOUVEAU_DSM_HAS_OPT;
262 nouveau_dsm_priv.dhandle = dhandle;
267 static bool nouveau_dsm_detect(void)
269 char acpi_method_name[255] = { 0 };
270 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
271 struct pci_dev *pdev = NULL;
279 /* lookup the MXM GUID */
280 guid_valid = mxm_wmi_supported();
283 printk("MXM: GUID detected in BIOS\n");
285 /* now do DSM detection */
286 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
289 retval = nouveau_dsm_pci_probe(pdev);
290 if (retval & NOUVEAU_DSM_HAS_MUX)
292 if (retval & NOUVEAU_DSM_HAS_OPT)
296 if (vga_count == 2 && has_dsm && guid_valid) {
297 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
299 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
301 nouveau_dsm_priv.dsm_detected = true;
305 if (has_optimus == 1) {
306 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
308 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
310 nouveau_dsm_priv.optimus_detected = true;
317 void nouveau_register_dsm_handler(void)
321 r = nouveau_dsm_detect();
325 vga_switcheroo_register_handler(&nouveau_dsm_handler);
328 /* Must be called for Optimus models before the card can be turned off */
329 void nouveau_switcheroo_optimus_dsm(void)
332 if (!nouveau_dsm_priv.optimus_detected)
335 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
336 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
339 void nouveau_unregister_dsm_handler(void)
341 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
342 vga_switcheroo_unregister_handler();
345 /* retrieve the ROM in 4k blocks */
346 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
350 union acpi_object rom_arg_elements[2], *obj;
351 struct acpi_object_list rom_arg;
352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
355 rom_arg.pointer = &rom_arg_elements[0];
357 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
358 rom_arg_elements[0].integer.value = offset;
360 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
361 rom_arg_elements[1].integer.value = len;
363 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
364 if (ACPI_FAILURE(status)) {
365 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
368 obj = (union acpi_object *)buffer.pointer;
369 memcpy(bios+offset, obj->buffer.pointer, len);
370 kfree(buffer.pointer);
374 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
377 acpi_handle dhandle, rom_handle;
379 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
382 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
386 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
387 if (ACPI_FAILURE(status))
390 nouveau_dsm_priv.rom_handle = rom_handle;
394 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
396 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
400 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
402 struct nouveau_connector *nv_connector = nouveau_connector(connector);
403 struct acpi_device *acpidev;
408 switch (connector->connector_type) {
409 case DRM_MODE_CONNECTOR_LVDS:
410 case DRM_MODE_CONNECTOR_eDP:
411 type = ACPI_VIDEO_DISPLAY_LCD;
417 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
421 ret = acpi_bus_get_device(handle, &acpidev);
425 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
429 nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);