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_FN 0x1A
29 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
31 static struct nouveau_dsm_priv {
33 bool optimus_detected;
35 acpi_handle rom_handle;
38 bool nouveau_is_optimus(void) {
39 return nouveau_dsm_priv.optimus_detected;
42 bool nouveau_is_v1_dsm(void) {
43 return nouveau_dsm_priv.dsm_detected;
46 #define NOUVEAU_DSM_HAS_MUX 0x1
47 #define NOUVEAU_DSM_HAS_OPT 0x2
49 static const char nouveau_dsm_muid[] = {
50 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
51 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
54 static const char nouveau_op_dsm_muid[] = {
55 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
56 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
59 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
61 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
62 struct acpi_object_list input;
63 union acpi_object params[4];
64 union acpi_object *obj;
69 input.pointer = params;
70 params[0].type = ACPI_TYPE_BUFFER;
71 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
72 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
73 params[1].type = ACPI_TYPE_INTEGER;
74 params[1].integer.value = 0x00000100;
75 params[2].type = ACPI_TYPE_INTEGER;
76 params[2].integer.value = func;
77 params[3].type = ACPI_TYPE_BUFFER;
78 params[3].buffer.length = 4;
79 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
80 for (i = 0; i < 4; i++)
81 args_buff[i] = (arg >> i * 8) & 0xFF;
82 params[3].buffer.pointer = args_buff;
84 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
86 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
90 obj = (union acpi_object *)output.pointer;
92 if (obj->type == ACPI_TYPE_INTEGER)
93 if (obj->integer.value == 0x80000002) {
97 if (obj->type == ACPI_TYPE_BUFFER) {
98 if (obj->buffer.length == 4 && result) {
100 *result |= obj->buffer.pointer[0];
101 *result |= (obj->buffer.pointer[1] << 8);
102 *result |= (obj->buffer.pointer[2] << 16);
103 *result |= (obj->buffer.pointer[3] << 24);
107 kfree(output.pointer);
111 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
113 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
114 struct acpi_object_list input;
115 union acpi_object params[4];
116 union acpi_object *obj;
120 input.pointer = params;
121 params[0].type = ACPI_TYPE_BUFFER;
122 params[0].buffer.length = sizeof(nouveau_dsm_muid);
123 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
124 params[1].type = ACPI_TYPE_INTEGER;
125 params[1].integer.value = 0x00000102;
126 params[2].type = ACPI_TYPE_INTEGER;
127 params[2].integer.value = func;
128 params[3].type = ACPI_TYPE_INTEGER;
129 params[3].integer.value = arg;
131 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
133 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
137 obj = (union acpi_object *)output.pointer;
139 if (obj->type == ACPI_TYPE_INTEGER)
140 if (obj->integer.value == 0x80000002)
143 if (obj->type == ACPI_TYPE_BUFFER) {
144 if (obj->buffer.length == 4 && result) {
146 *result |= obj->buffer.pointer[0];
147 *result |= (obj->buffer.pointer[1] << 8);
148 *result |= (obj->buffer.pointer[2] << 16);
149 *result |= (obj->buffer.pointer[3] << 24);
153 kfree(output.pointer);
157 /* Returns 1 if a DSM function is usable and 0 otherwise */
158 static int nouveau_test_dsm(acpi_handle test_handle,
159 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
164 /* Function 0 returns a Buffer containing available functions. The args
165 * parameter is ignored for function 0, so just put 0 in it */
166 if (dsm_func(test_handle, 0, 0, &result))
169 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
170 * the n-th bit is enabled, function n is supported */
171 return result & 1 && result & (1 << sfnc);
174 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
176 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
177 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
178 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
181 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
184 if (state == VGA_SWITCHEROO_ON)
185 arg = NOUVEAU_DSM_POWER_SPEED;
187 arg = NOUVEAU_DSM_POWER_STAMINA;
188 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
192 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
194 if (!nouveau_dsm_priv.dsm_detected)
196 if (id == VGA_SWITCHEROO_IGD)
197 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
199 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
202 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
203 enum vga_switcheroo_state state)
205 if (id == VGA_SWITCHEROO_IGD)
208 /* Optimus laptops have the card already disabled in
209 * nouveau_switcheroo_set_state */
210 if (!nouveau_dsm_priv.dsm_detected)
213 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
216 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
218 /* easy option one - intel vendor ID means Integrated */
219 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
220 return VGA_SWITCHEROO_IGD;
222 /* is this device on Bus 0? - this may need improving */
223 if (pdev->bus->number == 0)
224 return VGA_SWITCHEROO_IGD;
226 return VGA_SWITCHEROO_DIS;
229 static struct vga_switcheroo_handler nouveau_dsm_handler = {
230 .switchto = nouveau_dsm_switchto,
231 .power_state = nouveau_dsm_power_state,
232 .get_client_id = nouveau_dsm_get_client_id,
235 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
237 acpi_handle dhandle, nvidia_handle;
241 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
245 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
246 if (ACPI_FAILURE(status)) {
250 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
251 retval |= NOUVEAU_DSM_HAS_MUX;
253 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
254 NOUVEAU_DSM_OPTIMUS_FN))
255 retval |= NOUVEAU_DSM_HAS_OPT;
258 nouveau_dsm_priv.dhandle = dhandle;
263 static bool nouveau_dsm_detect(void)
265 char acpi_method_name[255] = { 0 };
266 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
267 struct pci_dev *pdev = NULL;
275 /* lookup the MXM GUID */
276 guid_valid = mxm_wmi_supported();
279 printk("MXM: GUID detected in BIOS\n");
281 /* now do DSM detection */
282 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
285 retval = nouveau_dsm_pci_probe(pdev);
286 if (retval & NOUVEAU_DSM_HAS_MUX)
288 if (retval & NOUVEAU_DSM_HAS_OPT)
292 /* find the optimus DSM or the old v1 DSM */
293 if (has_optimus == 1) {
294 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
296 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
298 nouveau_dsm_priv.optimus_detected = true;
300 } else if (vga_count == 2 && has_dsm && guid_valid) {
301 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
303 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
305 nouveau_dsm_priv.dsm_detected = true;
313 void nouveau_register_dsm_handler(void)
317 r = nouveau_dsm_detect();
321 vga_switcheroo_register_handler(&nouveau_dsm_handler);
324 /* Must be called for Optimus models before the card can be turned off */
325 void nouveau_switcheroo_optimus_dsm(void)
328 if (!nouveau_dsm_priv.optimus_detected)
331 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
332 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
335 void nouveau_unregister_dsm_handler(void)
337 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
338 vga_switcheroo_unregister_handler();
341 /* retrieve the ROM in 4k blocks */
342 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
346 union acpi_object rom_arg_elements[2], *obj;
347 struct acpi_object_list rom_arg;
348 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
351 rom_arg.pointer = &rom_arg_elements[0];
353 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
354 rom_arg_elements[0].integer.value = offset;
356 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
357 rom_arg_elements[1].integer.value = len;
359 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
360 if (ACPI_FAILURE(status)) {
361 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
364 obj = (union acpi_object *)buffer.pointer;
365 memcpy(bios+offset, obj->buffer.pointer, len);
366 kfree(buffer.pointer);
370 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
373 acpi_handle dhandle, rom_handle;
375 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
378 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
382 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
383 if (ACPI_FAILURE(status))
386 nouveau_dsm_priv.rom_handle = rom_handle;
390 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
392 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
396 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
398 struct acpi_device *acpidev;
403 switch (connector->connector_type) {
404 case DRM_MODE_CONNECTOR_LVDS:
405 case DRM_MODE_CONNECTOR_eDP:
406 type = ACPI_VIDEO_DISPLAY_LCD;
412 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
416 ret = acpi_bus_get_device(handle, &acpidev);
420 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
424 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);