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>
12 #include "drm_sarea.h"
13 #include "drm_crtc_helper.h"
14 #include "nouveau_drv.h"
15 #include <nouveau_drm.h>
16 #include "nouveau_connector.h"
18 #include <linux/vga_switcheroo.h>
20 #define NOUVEAU_DSM_LED 0x02
21 #define NOUVEAU_DSM_LED_STATE 0x00
22 #define NOUVEAU_DSM_LED_OFF 0x10
23 #define NOUVEAU_DSM_LED_STAMINA 0x11
24 #define NOUVEAU_DSM_LED_SPEED 0x12
26 #define NOUVEAU_DSM_POWER 0x03
27 #define NOUVEAU_DSM_POWER_STATE 0x00
28 #define NOUVEAU_DSM_POWER_SPEED 0x01
29 #define NOUVEAU_DSM_POWER_STAMINA 0x02
31 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
32 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
34 static struct nouveau_dsm_priv {
36 bool optimus_detected;
38 acpi_handle rom_handle;
41 #define NOUVEAU_DSM_HAS_MUX 0x1
42 #define NOUVEAU_DSM_HAS_OPT 0x2
44 static const char nouveau_dsm_muid[] = {
45 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
46 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
49 static const char nouveau_op_dsm_muid[] = {
50 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
51 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
54 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
56 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
57 struct acpi_object_list input;
58 union acpi_object params[4];
59 union acpi_object *obj;
64 input.pointer = params;
65 params[0].type = ACPI_TYPE_BUFFER;
66 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
67 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
68 params[1].type = ACPI_TYPE_INTEGER;
69 params[1].integer.value = 0x00000100;
70 params[2].type = ACPI_TYPE_INTEGER;
71 params[2].integer.value = func;
72 params[3].type = ACPI_TYPE_BUFFER;
73 params[3].buffer.length = 4;
74 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
75 for (i = 0; i < 4; i++)
76 args_buff[i] = (arg >> i * 8) & 0xFF;
77 params[3].buffer.pointer = args_buff;
79 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
81 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
85 obj = (union acpi_object *)output.pointer;
87 if (obj->type == ACPI_TYPE_INTEGER)
88 if (obj->integer.value == 0x80000002) {
92 if (obj->type == ACPI_TYPE_BUFFER) {
93 if (obj->buffer.length == 4 && result) {
95 *result |= obj->buffer.pointer[0];
96 *result |= (obj->buffer.pointer[1] << 8);
97 *result |= (obj->buffer.pointer[2] << 16);
98 *result |= (obj->buffer.pointer[3] << 24);
102 kfree(output.pointer);
106 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
108 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
109 struct acpi_object_list input;
110 union acpi_object params[4];
111 union acpi_object *obj;
115 input.pointer = params;
116 params[0].type = ACPI_TYPE_BUFFER;
117 params[0].buffer.length = sizeof(nouveau_dsm_muid);
118 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
119 params[1].type = ACPI_TYPE_INTEGER;
120 params[1].integer.value = 0x00000102;
121 params[2].type = ACPI_TYPE_INTEGER;
122 params[2].integer.value = func;
123 params[3].type = ACPI_TYPE_INTEGER;
124 params[3].integer.value = arg;
126 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
128 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
132 obj = (union acpi_object *)output.pointer;
134 if (obj->type == ACPI_TYPE_INTEGER)
135 if (obj->integer.value == 0x80000002)
138 if (obj->type == ACPI_TYPE_BUFFER) {
139 if (obj->buffer.length == 4 && result) {
141 *result |= obj->buffer.pointer[0];
142 *result |= (obj->buffer.pointer[1] << 8);
143 *result |= (obj->buffer.pointer[2] << 16);
144 *result |= (obj->buffer.pointer[3] << 24);
148 kfree(output.pointer);
152 /* Returns 1 if a DSM function is usable and 0 otherwise */
153 static int nouveau_test_dsm(acpi_handle test_handle,
154 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
159 /* Function 0 returns a Buffer containing available functions. The args
160 * parameter is ignored for function 0, so just put 0 in it */
161 if (dsm_func(test_handle, 0, 0, &result))
164 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
165 * the n-th bit is enabled, function n is supported */
166 return result & 1 && result & (1 << sfnc);
169 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
171 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
172 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
173 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
176 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
179 if (state == VGA_SWITCHEROO_ON)
180 arg = NOUVEAU_DSM_POWER_SPEED;
182 arg = NOUVEAU_DSM_POWER_STAMINA;
183 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
187 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
189 /* perhaps the _DSM functions are mutually exclusive, but prepare for
191 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
193 if (id == VGA_SWITCHEROO_IGD)
194 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
196 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
199 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
200 enum vga_switcheroo_state state)
202 if (id == VGA_SWITCHEROO_IGD)
205 /* Optimus laptops have the card already disabled in
206 * nouveau_switcheroo_set_state */
207 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
210 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
213 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
215 /* easy option one - intel vendor ID means Integrated */
216 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
217 return VGA_SWITCHEROO_IGD;
219 /* is this device on Bus 0? - this may need improving */
220 if (pdev->bus->number == 0)
221 return VGA_SWITCHEROO_IGD;
223 return VGA_SWITCHEROO_DIS;
226 static struct vga_switcheroo_handler nouveau_dsm_handler = {
227 .switchto = nouveau_dsm_switchto,
228 .power_state = nouveau_dsm_power_state,
229 .get_client_id = nouveau_dsm_get_client_id,
232 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
234 acpi_handle dhandle, nvidia_handle;
238 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
242 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
243 if (ACPI_FAILURE(status)) {
247 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
248 retval |= NOUVEAU_DSM_HAS_MUX;
250 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
251 NOUVEAU_DSM_OPTIMUS_FN))
252 retval |= NOUVEAU_DSM_HAS_OPT;
255 nouveau_dsm_priv.dhandle = dhandle;
260 static bool nouveau_dsm_detect(void)
262 char acpi_method_name[255] = { 0 };
263 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
264 struct pci_dev *pdev = NULL;
272 /* lookup the MXM GUID */
273 guid_valid = mxm_wmi_supported();
276 printk("MXM: GUID detected in BIOS\n");
278 /* now do DSM detection */
279 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
282 retval = nouveau_dsm_pci_probe(pdev);
283 if (retval & NOUVEAU_DSM_HAS_MUX)
285 if (retval & NOUVEAU_DSM_HAS_OPT)
289 if (vga_count == 2 && has_dsm && guid_valid) {
290 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
292 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
294 nouveau_dsm_priv.dsm_detected = true;
298 if (has_optimus == 1) {
299 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
301 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
303 nouveau_dsm_priv.optimus_detected = true;
310 void nouveau_register_dsm_handler(void)
314 r = nouveau_dsm_detect();
318 vga_switcheroo_register_handler(&nouveau_dsm_handler);
321 /* Must be called for Optimus models before the card can be turned off */
322 void nouveau_switcheroo_optimus_dsm(void)
325 if (!nouveau_dsm_priv.optimus_detected)
328 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
329 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
332 void nouveau_unregister_dsm_handler(void)
334 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
335 vga_switcheroo_unregister_handler();
338 /* retrieve the ROM in 4k blocks */
339 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
343 union acpi_object rom_arg_elements[2], *obj;
344 struct acpi_object_list rom_arg;
345 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
348 rom_arg.pointer = &rom_arg_elements[0];
350 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
351 rom_arg_elements[0].integer.value = offset;
353 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
354 rom_arg_elements[1].integer.value = len;
356 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
357 if (ACPI_FAILURE(status)) {
358 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
361 obj = (union acpi_object *)buffer.pointer;
362 memcpy(bios+offset, obj->buffer.pointer, len);
363 kfree(buffer.pointer);
367 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
370 acpi_handle dhandle, rom_handle;
372 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
375 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
379 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
380 if (ACPI_FAILURE(status))
383 nouveau_dsm_priv.rom_handle = rom_handle;
387 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
389 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
393 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
395 struct nouveau_connector *nv_connector = nouveau_connector(connector);
396 struct acpi_device *acpidev;
401 switch (connector->connector_type) {
402 case DRM_MODE_CONNECTOR_LVDS:
403 case DRM_MODE_CONNECTOR_eDP:
404 type = ACPI_VIDEO_DISPLAY_LCD;
410 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
414 ret = acpi_bus_get_device(handle, &acpidev);
418 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
422 nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);