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 #define NOUVEAU_DSM_HAS_MUX 0x1
39 #define NOUVEAU_DSM_HAS_OPT 0x2
41 static const char nouveau_dsm_muid[] = {
42 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
43 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
46 static const char nouveau_op_dsm_muid[] = {
47 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
48 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
51 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
53 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
54 struct acpi_object_list input;
55 union acpi_object params[4];
56 union acpi_object *obj;
61 input.pointer = params;
62 params[0].type = ACPI_TYPE_BUFFER;
63 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
64 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
65 params[1].type = ACPI_TYPE_INTEGER;
66 params[1].integer.value = 0x00000100;
67 params[2].type = ACPI_TYPE_INTEGER;
68 params[2].integer.value = func;
69 params[3].type = ACPI_TYPE_BUFFER;
70 params[3].buffer.length = 4;
71 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
72 for (i = 0; i < 4; i++)
73 args_buff[i] = (arg >> i * 8) & 0xFF;
74 params[3].buffer.pointer = args_buff;
76 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
78 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
82 obj = (union acpi_object *)output.pointer;
84 if (obj->type == ACPI_TYPE_INTEGER)
85 if (obj->integer.value == 0x80000002) {
89 if (obj->type == ACPI_TYPE_BUFFER) {
90 if (obj->buffer.length == 4 && result) {
92 *result |= obj->buffer.pointer[0];
93 *result |= (obj->buffer.pointer[1] << 8);
94 *result |= (obj->buffer.pointer[2] << 16);
95 *result |= (obj->buffer.pointer[3] << 24);
99 kfree(output.pointer);
103 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
105 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
106 struct acpi_object_list input;
107 union acpi_object params[4];
108 union acpi_object *obj;
112 input.pointer = params;
113 params[0].type = ACPI_TYPE_BUFFER;
114 params[0].buffer.length = sizeof(nouveau_dsm_muid);
115 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
116 params[1].type = ACPI_TYPE_INTEGER;
117 params[1].integer.value = 0x00000102;
118 params[2].type = ACPI_TYPE_INTEGER;
119 params[2].integer.value = func;
120 params[3].type = ACPI_TYPE_INTEGER;
121 params[3].integer.value = arg;
123 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
125 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
129 obj = (union acpi_object *)output.pointer;
131 if (obj->type == ACPI_TYPE_INTEGER)
132 if (obj->integer.value == 0x80000002)
135 if (obj->type == ACPI_TYPE_BUFFER) {
136 if (obj->buffer.length == 4 && result) {
138 *result |= obj->buffer.pointer[0];
139 *result |= (obj->buffer.pointer[1] << 8);
140 *result |= (obj->buffer.pointer[2] << 16);
141 *result |= (obj->buffer.pointer[3] << 24);
145 kfree(output.pointer);
149 /* Returns 1 if a DSM function is usable and 0 otherwise */
150 static int nouveau_test_dsm(acpi_handle test_handle,
151 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
156 /* Function 0 returns a Buffer containing available functions. The args
157 * parameter is ignored for function 0, so just put 0 in it */
158 if (dsm_func(test_handle, 0, 0, &result))
161 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
162 * the n-th bit is enabled, function n is supported */
163 return result & 1 && result & (1 << sfnc);
166 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
168 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
169 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
170 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
173 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
176 if (state == VGA_SWITCHEROO_ON)
177 arg = NOUVEAU_DSM_POWER_SPEED;
179 arg = NOUVEAU_DSM_POWER_STAMINA;
180 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
184 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
186 /* perhaps the _DSM functions are mutually exclusive, but prepare for
188 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
190 if (id == VGA_SWITCHEROO_IGD)
191 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
193 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
196 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
197 enum vga_switcheroo_state state)
199 if (id == VGA_SWITCHEROO_IGD)
202 /* Optimus laptops have the card already disabled in
203 * nouveau_switcheroo_set_state */
204 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
207 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
210 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
212 /* easy option one - intel vendor ID means Integrated */
213 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
214 return VGA_SWITCHEROO_IGD;
216 /* is this device on Bus 0? - this may need improving */
217 if (pdev->bus->number == 0)
218 return VGA_SWITCHEROO_IGD;
220 return VGA_SWITCHEROO_DIS;
223 static struct vga_switcheroo_handler nouveau_dsm_handler = {
224 .switchto = nouveau_dsm_switchto,
225 .power_state = nouveau_dsm_power_state,
226 .get_client_id = nouveau_dsm_get_client_id,
229 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
231 acpi_handle dhandle, nvidia_handle;
235 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
239 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
240 if (ACPI_FAILURE(status)) {
244 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
245 retval |= NOUVEAU_DSM_HAS_MUX;
247 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
248 NOUVEAU_DSM_OPTIMUS_FN))
249 retval |= NOUVEAU_DSM_HAS_OPT;
252 nouveau_dsm_priv.dhandle = dhandle;
257 static bool nouveau_dsm_detect(void)
259 char acpi_method_name[255] = { 0 };
260 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
261 struct pci_dev *pdev = NULL;
269 /* lookup the MXM GUID */
270 guid_valid = mxm_wmi_supported();
273 printk("MXM: GUID detected in BIOS\n");
275 /* now do DSM detection */
276 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
279 retval = nouveau_dsm_pci_probe(pdev);
280 if (retval & NOUVEAU_DSM_HAS_MUX)
282 if (retval & NOUVEAU_DSM_HAS_OPT)
286 if (vga_count == 2 && has_dsm && guid_valid) {
287 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
289 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
291 nouveau_dsm_priv.dsm_detected = true;
295 if (has_optimus == 1) {
296 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
298 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
300 nouveau_dsm_priv.optimus_detected = true;
307 void nouveau_register_dsm_handler(void)
311 r = nouveau_dsm_detect();
315 vga_switcheroo_register_handler(&nouveau_dsm_handler);
318 /* Must be called for Optimus models before the card can be turned off */
319 void nouveau_switcheroo_optimus_dsm(void)
322 if (!nouveau_dsm_priv.optimus_detected)
325 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
326 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
329 void nouveau_unregister_dsm_handler(void)
331 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
332 vga_switcheroo_unregister_handler();
335 /* retrieve the ROM in 4k blocks */
336 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
340 union acpi_object rom_arg_elements[2], *obj;
341 struct acpi_object_list rom_arg;
342 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
345 rom_arg.pointer = &rom_arg_elements[0];
347 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
348 rom_arg_elements[0].integer.value = offset;
350 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
351 rom_arg_elements[1].integer.value = len;
353 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
354 if (ACPI_FAILURE(status)) {
355 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
358 obj = (union acpi_object *)buffer.pointer;
359 memcpy(bios+offset, obj->buffer.pointer, len);
360 kfree(buffer.pointer);
364 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
367 acpi_handle dhandle, rom_handle;
369 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
372 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
376 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
377 if (ACPI_FAILURE(status))
380 nouveau_dsm_priv.rom_handle = rom_handle;
384 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
386 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
390 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
392 struct acpi_device *acpidev;
397 switch (connector->connector_type) {
398 case DRM_MODE_CONNECTOR_LVDS:
399 case DRM_MODE_CONNECTOR_eDP:
400 type = ACPI_VIDEO_DISPLAY_LCD;
406 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
410 ret = acpi_bus_get_device(handle, &acpidev);
414 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
418 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);