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;
48 bool optimus_flags_detected;
49 bool optimus_skip_dsm;
51 acpi_handle rom_handle;
54 bool nouveau_is_optimus(void) {
55 return nouveau_dsm_priv.optimus_detected;
58 bool nouveau_is_v1_dsm(void) {
59 return nouveau_dsm_priv.dsm_detected;
62 #ifdef CONFIG_VGA_SWITCHEROO
63 static const char nouveau_dsm_muid[] = {
64 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
68 static const char nouveau_op_dsm_muid[] = {
69 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
70 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
73 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
76 union acpi_object *obj;
78 union acpi_object argv4 = {
79 .buffer.type = ACPI_TYPE_BUFFER,
81 .buffer.pointer = args_buff
84 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
85 for (i = 0; i < 4; i++)
86 args_buff[i] = (arg >> i * 8) & 0xFF;
89 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
90 func, &argv4, ACPI_TYPE_BUFFER);
92 acpi_handle_info(handle, "failed to evaluate _DSM\n");
95 if (obj->buffer.length == 4) {
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);
108 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
109 * requirements on the fourth parameter, so a private implementation
110 * instead of using acpi_check_dsm().
112 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
117 * Function 0 returns a Buffer containing available functions.
118 * The args parameter is ignored for function 0, so just put 0 in it
120 if (nouveau_optimus_dsm(handle, 0, 0, &result))
124 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
125 * If the n-th bit is enabled, function n is supported
127 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
132 static int nouveau_dsm(acpi_handle handle, int func, int arg)
135 union acpi_object *obj;
136 union acpi_object argv4 = {
137 .integer.type = ACPI_TYPE_INTEGER,
138 .integer.value = arg,
141 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
142 func, &argv4, ACPI_TYPE_INTEGER);
144 acpi_handle_info(handle, "failed to evaluate _DSM\n");
147 if (obj->integer.value == 0x80000002)
155 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
157 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
158 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
159 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
162 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
165 if (state == VGA_SWITCHEROO_ON)
166 arg = NOUVEAU_DSM_POWER_SPEED;
168 arg = NOUVEAU_DSM_POWER_STAMINA;
169 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
173 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
175 if (!nouveau_dsm_priv.dsm_detected)
177 if (id == VGA_SWITCHEROO_IGD)
178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
180 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
183 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
184 enum vga_switcheroo_state state)
186 if (id == VGA_SWITCHEROO_IGD)
189 /* Optimus laptops have the card already disabled in
190 * nouveau_switcheroo_set_state */
191 if (!nouveau_dsm_priv.dsm_detected)
194 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
197 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
199 /* easy option one - intel vendor ID means Integrated */
200 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
201 return VGA_SWITCHEROO_IGD;
203 /* is this device on Bus 0? - this may need improving */
204 if (pdev->bus->number == 0)
205 return VGA_SWITCHEROO_IGD;
207 return VGA_SWITCHEROO_DIS;
210 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
211 .switchto = nouveau_dsm_switchto,
212 .power_state = nouveau_dsm_power_state,
213 .get_client_id = nouveau_dsm_get_client_id,
217 * Firmware supporting Windows 8 or later do not use _DSM to put the device into
218 * D3cold, they instead rely on disabling power resources on the parent.
220 static bool nouveau_pr3_present(struct pci_dev *pdev)
222 struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
223 struct acpi_device *parent_adev;
228 if (!parent_pdev->bridge_d3) {
230 * Parent PCI bridge is currently not power managed.
231 * Since userspace can change these afterwards to be on
232 * the safe side we stick with _DSM and prevent usage of
233 * _PR3 from the bridge.
235 pci_d3cold_disable(pdev);
239 parent_adev = ACPI_COMPANION(&parent_pdev->dev);
243 return parent_adev->power.flags.power_resources &&
244 acpi_has_method(parent_adev->handle, "_PR3");
247 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
248 bool *has_mux, bool *has_opt,
249 bool *has_opt_flags, bool *has_pr3)
255 dhandle = ACPI_HANDLE(&pdev->dev);
259 if (!acpi_has_method(dhandle, "_DSM"))
262 supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
263 1 << NOUVEAU_DSM_POWER);
264 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
266 /* Does not look like a Nvidia device. */
267 if (!supports_mux && !optimus_funcs)
270 *dhandle_out = dhandle;
271 *has_mux = supports_mux;
272 *has_opt = !!optimus_funcs;
273 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
278 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
280 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
281 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
282 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
283 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
285 *has_pr3 = nouveau_pr3_present(pdev);
289 static bool nouveau_dsm_detect(void)
291 char acpi_method_name[255] = { 0 };
292 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
293 struct pci_dev *pdev = NULL;
294 acpi_handle dhandle = NULL;
295 bool has_mux = false;
296 bool has_optimus = false;
297 bool has_optimus_flags = false;
298 bool has_power_resources = false;
303 /* lookup the MXM GUID */
304 guid_valid = mxm_wmi_supported();
307 printk("MXM: GUID detected in BIOS\n");
309 /* now do DSM detection */
310 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
313 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
314 &has_optimus_flags, &has_power_resources);
317 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
320 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
321 &has_optimus_flags, &has_power_resources);
324 /* find the optimus DSM or the old v1 DSM */
326 nouveau_dsm_priv.dhandle = dhandle;
327 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
329 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
331 if (has_power_resources)
332 pr_info("nouveau: detected PR support, will not use DSM\n");
333 nouveau_dsm_priv.optimus_detected = true;
334 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
335 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
337 } else if (vga_count == 2 && has_mux && guid_valid) {
338 nouveau_dsm_priv.dhandle = dhandle;
339 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
341 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
343 nouveau_dsm_priv.dsm_detected = true;
351 void nouveau_register_dsm_handler(void)
355 r = nouveau_dsm_detect();
359 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
362 /* Must be called for Optimus models before the card can be turned off */
363 void nouveau_switcheroo_optimus_dsm(void)
366 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
369 if (nouveau_dsm_priv.optimus_flags_detected)
370 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
373 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
374 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
378 void nouveau_unregister_dsm_handler(void)
380 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
381 vga_switcheroo_unregister_handler();
384 void nouveau_register_dsm_handler(void) {}
385 void nouveau_unregister_dsm_handler(void) {}
386 void nouveau_switcheroo_optimus_dsm(void) {}
389 /* retrieve the ROM in 4k blocks */
390 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
394 union acpi_object rom_arg_elements[2], *obj;
395 struct acpi_object_list rom_arg;
396 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
399 rom_arg.pointer = &rom_arg_elements[0];
401 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
402 rom_arg_elements[0].integer.value = offset;
404 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
405 rom_arg_elements[1].integer.value = len;
407 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
408 if (ACPI_FAILURE(status)) {
409 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
412 obj = (union acpi_object *)buffer.pointer;
413 len = min(len, (int)obj->buffer.length);
414 memcpy(bios+offset, obj->buffer.pointer, len);
415 kfree(buffer.pointer);
419 bool nouveau_acpi_rom_supported(struct device *dev)
422 acpi_handle dhandle, rom_handle;
424 dhandle = ACPI_HANDLE(dev);
428 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
429 if (ACPI_FAILURE(status))
432 nouveau_dsm_priv.rom_handle = rom_handle;
436 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
438 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
442 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
444 struct acpi_device *acpidev;
449 switch (connector->connector_type) {
450 case DRM_MODE_CONNECTOR_LVDS:
451 case DRM_MODE_CONNECTOR_eDP:
452 type = ACPI_VIDEO_DISPLAY_LCD;
458 handle = ACPI_HANDLE(&dev->pdev->dev);
462 ret = acpi_bus_get_device(handle, &acpidev);
466 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
470 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);