2 #include <linux/acpi.h>
3 #include <linux/slab.h>
4 #include <linux/mxm-wmi.h>
5 #include <linux/vga_switcheroo.h>
6 #include <drm/drm_edid.h>
7 #include <acpi/video.h>
9 #include "nouveau_drm.h"
10 #include "nouveau_acpi.h"
12 #define NOUVEAU_DSM_LED 0x02
13 #define NOUVEAU_DSM_LED_STATE 0x00
14 #define NOUVEAU_DSM_LED_OFF 0x10
15 #define NOUVEAU_DSM_LED_STAMINA 0x11
16 #define NOUVEAU_DSM_LED_SPEED 0x12
18 #define NOUVEAU_DSM_POWER 0x03
19 #define NOUVEAU_DSM_POWER_STATE 0x00
20 #define NOUVEAU_DSM_POWER_SPEED 0x01
21 #define NOUVEAU_DSM_POWER_STAMINA 0x02
23 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
24 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
26 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
27 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
28 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
30 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
32 /* result of the optimus caps function */
33 #define OPTIMUS_ENABLED (1 << 0)
34 #define OPTIMUS_STATUS_MASK (3 << 3)
35 #define OPTIMUS_STATUS_OFF (0 << 3)
36 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
37 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
38 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
39 #define OPTIMUS_CAPS_MASK (7 << 24)
40 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
42 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
43 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
45 static struct nouveau_dsm_priv {
47 bool optimus_detected;
49 acpi_handle other_handle;
50 acpi_handle rom_handle;
53 bool nouveau_is_optimus(void) {
54 return nouveau_dsm_priv.optimus_detected;
57 bool nouveau_is_v1_dsm(void) {
58 return nouveau_dsm_priv.dsm_detected;
61 #define NOUVEAU_DSM_HAS_MUX 0x1
62 #define NOUVEAU_DSM_HAS_OPT 0x2
64 #ifdef CONFIG_VGA_SWITCHEROO
65 static const char nouveau_dsm_muid[] = {
66 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
67 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
70 static const char nouveau_op_dsm_muid[] = {
71 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
72 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
75 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
78 union acpi_object *obj;
80 union acpi_object argv4 = {
81 .buffer.type = ACPI_TYPE_BUFFER,
83 .buffer.pointer = args_buff
86 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
87 for (i = 0; i < 4; i++)
88 args_buff[i] = (arg >> i * 8) & 0xFF;
91 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
92 func, &argv4, ACPI_TYPE_BUFFER);
94 acpi_handle_info(handle, "failed to evaluate _DSM\n");
97 if (obj->buffer.length == 4) {
98 *result |= obj->buffer.pointer[0];
99 *result |= (obj->buffer.pointer[1] << 8);
100 *result |= (obj->buffer.pointer[2] << 16);
101 *result |= (obj->buffer.pointer[3] << 24);
109 static int nouveau_dsm(acpi_handle handle, int func, int arg)
112 union acpi_object *obj;
113 union acpi_object argv4 = {
114 .integer.type = ACPI_TYPE_INTEGER,
115 .integer.value = arg,
118 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
119 func, &argv4, ACPI_TYPE_INTEGER);
121 acpi_handle_info(handle, "failed to evaluate _DSM\n");
124 if (obj->integer.value == 0x80000002)
132 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
134 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
135 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
136 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
139 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
142 if (state == VGA_SWITCHEROO_ON)
143 arg = NOUVEAU_DSM_POWER_SPEED;
145 arg = NOUVEAU_DSM_POWER_STAMINA;
146 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
150 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
152 if (!nouveau_dsm_priv.dsm_detected)
154 if (id == VGA_SWITCHEROO_IGD)
155 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
157 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
160 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
161 enum vga_switcheroo_state state)
163 if (id == VGA_SWITCHEROO_IGD)
166 /* Optimus laptops have the card already disabled in
167 * nouveau_switcheroo_set_state */
168 if (!nouveau_dsm_priv.dsm_detected)
171 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
174 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
176 /* easy option one - intel vendor ID means Integrated */
177 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
178 return VGA_SWITCHEROO_IGD;
180 /* is this device on Bus 0? - this may need improving */
181 if (pdev->bus->number == 0)
182 return VGA_SWITCHEROO_IGD;
184 return VGA_SWITCHEROO_DIS;
187 static struct vga_switcheroo_handler nouveau_dsm_handler = {
188 .switchto = nouveau_dsm_switchto,
189 .power_state = nouveau_dsm_power_state,
190 .get_client_id = nouveau_dsm_get_client_id,
193 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
198 dhandle = ACPI_HANDLE(&pdev->dev);
202 if (!acpi_has_method(dhandle, "_DSM")) {
203 nouveau_dsm_priv.other_handle = dhandle;
206 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
207 1 << NOUVEAU_DSM_POWER))
208 retval |= NOUVEAU_DSM_HAS_MUX;
210 if (acpi_check_dsm(dhandle, nouveau_op_dsm_muid, 0x00000100,
211 1 << NOUVEAU_DSM_OPTIMUS_CAPS))
212 retval |= NOUVEAU_DSM_HAS_OPT;
214 if (retval & NOUVEAU_DSM_HAS_OPT) {
216 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
218 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
219 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
220 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
221 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
224 nouveau_dsm_priv.dhandle = dhandle;
229 static bool nouveau_dsm_detect(void)
231 char acpi_method_name[255] = { 0 };
232 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
233 struct pci_dev *pdev = NULL;
241 /* lookup the MXM GUID */
242 guid_valid = mxm_wmi_supported();
245 printk("MXM: GUID detected in BIOS\n");
247 /* now do DSM detection */
248 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
251 retval = nouveau_dsm_pci_probe(pdev);
252 if (retval & NOUVEAU_DSM_HAS_MUX)
254 if (retval & NOUVEAU_DSM_HAS_OPT)
258 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
261 retval = nouveau_dsm_pci_probe(pdev);
262 if (retval & NOUVEAU_DSM_HAS_MUX)
264 if (retval & NOUVEAU_DSM_HAS_OPT)
268 /* find the optimus DSM or the old v1 DSM */
269 if (has_optimus == 1) {
270 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
272 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
274 nouveau_dsm_priv.optimus_detected = true;
276 } else if (vga_count == 2 && has_dsm && guid_valid) {
277 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
279 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
281 nouveau_dsm_priv.dsm_detected = true;
283 * On some systems hotplug events are generated for the device
284 * being switched off when _DSM is executed. They cause ACPI
285 * hotplug to trigger and attempt to remove the device from
286 * the system, which causes it to break down. Prevent that from
287 * happening by setting the no_hotplug flag for the involved
288 * ACPI device objects.
290 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
291 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
299 void nouveau_register_dsm_handler(void)
303 r = nouveau_dsm_detect();
307 vga_switcheroo_register_handler(&nouveau_dsm_handler);
310 /* Must be called for Optimus models before the card can be turned off */
311 void nouveau_switcheroo_optimus_dsm(void)
314 if (!nouveau_dsm_priv.optimus_detected)
317 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
320 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
321 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
325 void nouveau_unregister_dsm_handler(void)
327 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
328 vga_switcheroo_unregister_handler();
331 void nouveau_register_dsm_handler(void) {}
332 void nouveau_unregister_dsm_handler(void) {}
333 void nouveau_switcheroo_optimus_dsm(void) {}
336 /* retrieve the ROM in 4k blocks */
337 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
341 union acpi_object rom_arg_elements[2], *obj;
342 struct acpi_object_list rom_arg;
343 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
346 rom_arg.pointer = &rom_arg_elements[0];
348 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
349 rom_arg_elements[0].integer.value = offset;
351 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
352 rom_arg_elements[1].integer.value = len;
354 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
355 if (ACPI_FAILURE(status)) {
356 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
359 obj = (union acpi_object *)buffer.pointer;
360 memcpy(bios+offset, obj->buffer.pointer, len);
361 kfree(buffer.pointer);
365 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
368 acpi_handle dhandle, rom_handle;
370 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
373 dhandle = ACPI_HANDLE(&pdev->dev);
377 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
378 if (ACPI_FAILURE(status))
381 nouveau_dsm_priv.rom_handle = rom_handle;
385 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
387 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
391 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
393 struct acpi_device *acpidev;
398 switch (connector->connector_type) {
399 case DRM_MODE_CONNECTOR_LVDS:
400 case DRM_MODE_CONNECTOR_eDP:
401 type = ACPI_VIDEO_DISPLAY_LCD;
407 handle = ACPI_HANDLE(&dev->pdev->dev);
411 ret = acpi_bus_get_device(handle, &acpidev);
415 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
419 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);