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>
10 #include <linux/vga_switcheroo.h>
12 #include <drm/drm_edid.h>
14 #include "nouveau_drm.h"
15 #include "nouveau_acpi.h"
17 #define NOUVEAU_DSM_LED 0x02
18 #define NOUVEAU_DSM_LED_STATE 0x00
19 #define NOUVEAU_DSM_LED_OFF 0x10
20 #define NOUVEAU_DSM_LED_STAMINA 0x11
21 #define NOUVEAU_DSM_LED_SPEED 0x12
23 #define NOUVEAU_DSM_POWER 0x03
24 #define NOUVEAU_DSM_POWER_STATE 0x00
25 #define NOUVEAU_DSM_POWER_SPEED 0x01
26 #define NOUVEAU_DSM_POWER_STAMINA 0x02
28 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
29 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
31 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
32 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
33 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
35 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
37 /* result of the optimus caps function */
38 #define OPTIMUS_ENABLED (1 << 0)
39 #define OPTIMUS_STATUS_MASK (3 << 3)
40 #define OPTIMUS_STATUS_OFF (0 << 3)
41 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
42 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
43 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
44 #define OPTIMUS_CAPS_MASK (7 << 24)
45 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
47 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
48 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
50 static struct nouveau_dsm_priv {
52 bool optimus_detected;
54 acpi_handle rom_handle;
57 bool nouveau_is_optimus(void) {
58 return nouveau_dsm_priv.optimus_detected;
61 bool nouveau_is_v1_dsm(void) {
62 return nouveau_dsm_priv.dsm_detected;
65 #define NOUVEAU_DSM_HAS_MUX 0x1
66 #define NOUVEAU_DSM_HAS_OPT 0x2
68 static const char nouveau_dsm_muid[] = {
69 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
70 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
73 static const char nouveau_op_dsm_muid[] = {
74 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
75 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
78 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
80 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
81 struct acpi_object_list input;
82 union acpi_object params[4];
83 union acpi_object *obj;
88 input.pointer = params;
89 params[0].type = ACPI_TYPE_BUFFER;
90 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
91 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
92 params[1].type = ACPI_TYPE_INTEGER;
93 params[1].integer.value = 0x00000100;
94 params[2].type = ACPI_TYPE_INTEGER;
95 params[2].integer.value = func;
96 params[3].type = ACPI_TYPE_BUFFER;
97 params[3].buffer.length = 4;
98 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
99 for (i = 0; i < 4; i++)
100 args_buff[i] = (arg >> i * 8) & 0xFF;
101 params[3].buffer.pointer = args_buff;
103 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
105 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
109 obj = (union acpi_object *)output.pointer;
111 if (obj->type == ACPI_TYPE_INTEGER)
112 if (obj->integer.value == 0x80000002) {
116 if (obj->type == ACPI_TYPE_BUFFER) {
117 if (obj->buffer.length == 4 && result) {
119 *result |= obj->buffer.pointer[0];
120 *result |= (obj->buffer.pointer[1] << 8);
121 *result |= (obj->buffer.pointer[2] << 16);
122 *result |= (obj->buffer.pointer[3] << 24);
126 kfree(output.pointer);
130 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
132 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
133 struct acpi_object_list input;
134 union acpi_object params[4];
135 union acpi_object *obj;
139 input.pointer = params;
140 params[0].type = ACPI_TYPE_BUFFER;
141 params[0].buffer.length = sizeof(nouveau_dsm_muid);
142 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
143 params[1].type = ACPI_TYPE_INTEGER;
144 params[1].integer.value = 0x00000102;
145 params[2].type = ACPI_TYPE_INTEGER;
146 params[2].integer.value = func;
147 params[3].type = ACPI_TYPE_INTEGER;
148 params[3].integer.value = arg;
150 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
152 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
156 obj = (union acpi_object *)output.pointer;
158 if (obj->type == ACPI_TYPE_INTEGER)
159 if (obj->integer.value == 0x80000002)
162 if (obj->type == ACPI_TYPE_BUFFER) {
163 if (obj->buffer.length == 4 && result) {
165 *result |= obj->buffer.pointer[0];
166 *result |= (obj->buffer.pointer[1] << 8);
167 *result |= (obj->buffer.pointer[2] << 16);
168 *result |= (obj->buffer.pointer[3] << 24);
172 kfree(output.pointer);
176 /* Returns 1 if a DSM function is usable and 0 otherwise */
177 static int nouveau_test_dsm(acpi_handle test_handle,
178 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
183 /* Function 0 returns a Buffer containing available functions. The args
184 * parameter is ignored for function 0, so just put 0 in it */
185 if (dsm_func(test_handle, 0, 0, &result))
188 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
189 * the n-th bit is enabled, function n is supported */
190 return result & 1 && result & (1 << sfnc);
193 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
195 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
196 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
197 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
200 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
203 if (state == VGA_SWITCHEROO_ON)
204 arg = NOUVEAU_DSM_POWER_SPEED;
206 arg = NOUVEAU_DSM_POWER_STAMINA;
207 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
211 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
213 if (!nouveau_dsm_priv.dsm_detected)
215 if (id == VGA_SWITCHEROO_IGD)
216 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
218 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
221 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
222 enum vga_switcheroo_state state)
224 if (id == VGA_SWITCHEROO_IGD)
227 /* Optimus laptops have the card already disabled in
228 * nouveau_switcheroo_set_state */
229 if (!nouveau_dsm_priv.dsm_detected)
232 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
235 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
237 /* easy option one - intel vendor ID means Integrated */
238 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
239 return VGA_SWITCHEROO_IGD;
241 /* is this device on Bus 0? - this may need improving */
242 if (pdev->bus->number == 0)
243 return VGA_SWITCHEROO_IGD;
245 return VGA_SWITCHEROO_DIS;
248 static struct vga_switcheroo_handler nouveau_dsm_handler = {
249 .switchto = nouveau_dsm_switchto,
250 .power_state = nouveau_dsm_power_state,
251 .get_client_id = nouveau_dsm_get_client_id,
254 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
259 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
263 if (!acpi_has_method(dhandle, "_DSM"))
266 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
267 retval |= NOUVEAU_DSM_HAS_MUX;
269 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
270 NOUVEAU_DSM_OPTIMUS_CAPS))
271 retval |= NOUVEAU_DSM_HAS_OPT;
273 if (retval & NOUVEAU_DSM_HAS_OPT) {
275 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
277 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
278 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
279 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
280 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
283 nouveau_dsm_priv.dhandle = dhandle;
288 static bool nouveau_dsm_detect(void)
290 char acpi_method_name[255] = { 0 };
291 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
292 struct pci_dev *pdev = NULL;
300 /* lookup the MXM GUID */
301 guid_valid = mxm_wmi_supported();
304 printk("MXM: GUID detected in BIOS\n");
306 /* now do DSM detection */
307 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
310 retval = nouveau_dsm_pci_probe(pdev);
311 if (retval & NOUVEAU_DSM_HAS_MUX)
313 if (retval & NOUVEAU_DSM_HAS_OPT)
317 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
320 retval = nouveau_dsm_pci_probe(pdev);
321 if (retval & NOUVEAU_DSM_HAS_MUX)
323 if (retval & NOUVEAU_DSM_HAS_OPT)
327 /* find the optimus DSM or the old v1 DSM */
328 if (has_optimus == 1) {
329 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
331 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
333 nouveau_dsm_priv.optimus_detected = true;
335 } else if (vga_count == 2 && has_dsm && guid_valid) {
336 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
338 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
340 nouveau_dsm_priv.dsm_detected = true;
348 void nouveau_register_dsm_handler(void)
352 r = nouveau_dsm_detect();
356 vga_switcheroo_register_handler(&nouveau_dsm_handler);
359 /* Must be called for Optimus models before the card can be turned off */
360 void nouveau_switcheroo_optimus_dsm(void)
363 if (!nouveau_dsm_priv.optimus_detected)
366 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
369 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
370 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
374 void nouveau_unregister_dsm_handler(void)
376 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
377 vga_switcheroo_unregister_handler();
380 /* retrieve the ROM in 4k blocks */
381 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
385 union acpi_object rom_arg_elements[2], *obj;
386 struct acpi_object_list rom_arg;
387 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
390 rom_arg.pointer = &rom_arg_elements[0];
392 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
393 rom_arg_elements[0].integer.value = offset;
395 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
396 rom_arg_elements[1].integer.value = len;
398 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
399 if (ACPI_FAILURE(status)) {
400 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
403 obj = (union acpi_object *)buffer.pointer;
404 memcpy(bios+offset, obj->buffer.pointer, len);
405 kfree(buffer.pointer);
409 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
412 acpi_handle dhandle, rom_handle;
414 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
417 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
421 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
422 if (ACPI_FAILURE(status))
425 nouveau_dsm_priv.rom_handle = rom_handle;
429 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
431 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
435 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
437 struct acpi_device *acpidev;
442 switch (connector->connector_type) {
443 case DRM_MODE_CONNECTOR_LVDS:
444 case DRM_MODE_CONNECTOR_eDP:
445 type = ACPI_VIDEO_DISPLAY_LCD;
451 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
455 ret = acpi_bus_get_device(handle, &acpidev);
459 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
463 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);