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_drv.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 rom_handle;
52 bool nouveau_is_optimus(void) {
53 return nouveau_dsm_priv.optimus_detected;
56 bool nouveau_is_v1_dsm(void) {
57 return nouveau_dsm_priv.dsm_detected;
60 #ifdef CONFIG_VGA_SWITCHEROO
61 static const char nouveau_dsm_muid[] = {
62 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
63 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
66 static const char nouveau_op_dsm_muid[] = {
67 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
68 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
71 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
74 union acpi_object *obj;
76 union acpi_object argv4 = {
77 .buffer.type = ACPI_TYPE_BUFFER,
79 .buffer.pointer = args_buff
82 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
83 for (i = 0; i < 4; i++)
84 args_buff[i] = (arg >> i * 8) & 0xFF;
87 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
88 func, &argv4, ACPI_TYPE_BUFFER);
90 acpi_handle_info(handle, "failed to evaluate _DSM\n");
93 if (obj->buffer.length == 4) {
94 *result |= obj->buffer.pointer[0];
95 *result |= (obj->buffer.pointer[1] << 8);
96 *result |= (obj->buffer.pointer[2] << 16);
97 *result |= (obj->buffer.pointer[3] << 24);
106 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
107 * requirements on the fourth parameter, so a private implementation
108 * instead of using acpi_check_dsm().
110 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
115 * Function 0 returns a Buffer containing available functions.
116 * The args parameter is ignored for function 0, so just put 0 in it
118 if (nouveau_optimus_dsm(handle, 0, 0, &result))
122 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
123 * If the n-th bit is enabled, function n is supported
125 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
130 static int nouveau_dsm(acpi_handle handle, int func, int arg)
133 union acpi_object *obj;
134 union acpi_object argv4 = {
135 .integer.type = ACPI_TYPE_INTEGER,
136 .integer.value = arg,
139 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
140 func, &argv4, ACPI_TYPE_INTEGER);
142 acpi_handle_info(handle, "failed to evaluate _DSM\n");
145 if (obj->integer.value == 0x80000002)
153 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
155 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
156 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
157 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
160 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
163 if (state == VGA_SWITCHEROO_ON)
164 arg = NOUVEAU_DSM_POWER_SPEED;
166 arg = NOUVEAU_DSM_POWER_STAMINA;
167 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
171 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
173 if (!nouveau_dsm_priv.dsm_detected)
175 if (id == VGA_SWITCHEROO_IGD)
176 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
181 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
182 enum vga_switcheroo_state state)
184 if (id == VGA_SWITCHEROO_IGD)
187 /* Optimus laptops have the card already disabled in
188 * nouveau_switcheroo_set_state */
189 if (!nouveau_dsm_priv.dsm_detected)
192 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
195 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
197 /* easy option one - intel vendor ID means Integrated */
198 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
199 return VGA_SWITCHEROO_IGD;
201 /* is this device on Bus 0? - this may need improving */
202 if (pdev->bus->number == 0)
203 return VGA_SWITCHEROO_IGD;
205 return VGA_SWITCHEROO_DIS;
208 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
209 .switchto = nouveau_dsm_switchto,
210 .power_state = nouveau_dsm_power_state,
211 .get_client_id = nouveau_dsm_get_client_id,
214 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
215 bool *has_mux, bool *has_opt)
221 dhandle = ACPI_HANDLE(&pdev->dev);
225 if (!acpi_has_method(dhandle, "_DSM"))
228 supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
229 1 << NOUVEAU_DSM_POWER);
230 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
232 /* Does not look like a Nvidia device. */
233 if (!supports_mux && !optimus_funcs)
236 *dhandle_out = dhandle;
237 *has_mux = supports_mux;
238 *has_opt = !!optimus_funcs;
242 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
244 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
245 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
246 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
247 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
251 static bool nouveau_dsm_detect(void)
253 char acpi_method_name[255] = { 0 };
254 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
255 struct pci_dev *pdev = NULL;
256 acpi_handle dhandle = NULL;
257 bool has_mux = false;
258 bool has_optimus = false;
263 /* lookup the MXM GUID */
264 guid_valid = mxm_wmi_supported();
267 printk("MXM: GUID detected in BIOS\n");
269 /* now do DSM detection */
270 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
273 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
276 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
279 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
282 /* find the optimus DSM or the old v1 DSM */
284 nouveau_dsm_priv.dhandle = dhandle;
285 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
287 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
289 nouveau_dsm_priv.optimus_detected = true;
291 } else if (vga_count == 2 && has_mux && guid_valid) {
292 nouveau_dsm_priv.dhandle = dhandle;
293 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
295 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
297 nouveau_dsm_priv.dsm_detected = true;
305 void nouveau_register_dsm_handler(void)
309 r = nouveau_dsm_detect();
313 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
316 /* Must be called for Optimus models before the card can be turned off */
317 void nouveau_switcheroo_optimus_dsm(void)
320 if (!nouveau_dsm_priv.optimus_detected)
323 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
326 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
327 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
331 void nouveau_unregister_dsm_handler(void)
333 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
334 vga_switcheroo_unregister_handler();
337 void nouveau_register_dsm_handler(void) {}
338 void nouveau_unregister_dsm_handler(void) {}
339 void nouveau_switcheroo_optimus_dsm(void) {}
342 /* retrieve the ROM in 4k blocks */
343 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
347 union acpi_object rom_arg_elements[2], *obj;
348 struct acpi_object_list rom_arg;
349 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
352 rom_arg.pointer = &rom_arg_elements[0];
354 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
355 rom_arg_elements[0].integer.value = offset;
357 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
358 rom_arg_elements[1].integer.value = len;
360 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
361 if (ACPI_FAILURE(status)) {
362 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
365 obj = (union acpi_object *)buffer.pointer;
366 len = min(len, (int)obj->buffer.length);
367 memcpy(bios+offset, obj->buffer.pointer, len);
368 kfree(buffer.pointer);
372 bool nouveau_acpi_rom_supported(struct device *dev)
375 acpi_handle dhandle, rom_handle;
377 dhandle = ACPI_HANDLE(dev);
381 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
382 if (ACPI_FAILURE(status))
385 nouveau_dsm_priv.rom_handle = rom_handle;
389 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
391 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
395 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
397 struct acpi_device *acpidev;
402 switch (connector->connector_type) {
403 case DRM_MODE_CONNECTOR_LVDS:
404 case DRM_MODE_CONNECTOR_eDP:
405 type = ACPI_VIDEO_DISPLAY_LCD;
411 handle = ACPI_HANDLE(&dev->pdev->dev);
415 ret = acpi_bus_get_device(handle, &acpidev);
419 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
423 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);