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 "nv50_display.h"
17 #include "nouveau_connector.h"
19 #include <linux/vga_switcheroo.h>
21 #define NOUVEAU_DSM_LED 0x02
22 #define NOUVEAU_DSM_LED_STATE 0x00
23 #define NOUVEAU_DSM_LED_OFF 0x10
24 #define NOUVEAU_DSM_LED_STAMINA 0x11
25 #define NOUVEAU_DSM_LED_SPEED 0x12
27 #define NOUVEAU_DSM_POWER 0x03
28 #define NOUVEAU_DSM_POWER_STATE 0x00
29 #define NOUVEAU_DSM_POWER_SPEED 0x01
30 #define NOUVEAU_DSM_POWER_STAMINA 0x02
32 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
33 static struct nouveau_dsm_priv {
35 bool optimus_detected;
37 acpi_handle rom_handle;
40 #define NOUVEAU_DSM_HAS_MUX 0x1
41 #define NOUVEAU_DSM_HAS_OPT 0x2
43 static const char nouveau_dsm_muid[] = {
44 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
45 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
48 static const char nouveau_op_dsm_muid[] = {
49 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
50 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
53 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
55 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
56 struct acpi_object_list input;
57 union acpi_object params[4];
58 union acpi_object *obj;
62 input.pointer = params;
63 params[0].type = ACPI_TYPE_BUFFER;
64 params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
65 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
66 params[1].type = ACPI_TYPE_INTEGER;
67 params[1].integer.value = 0x00000100;
68 params[2].type = ACPI_TYPE_INTEGER;
69 params[2].integer.value = func;
70 params[3].type = ACPI_TYPE_BUFFER;
71 params[3].buffer.length = 0;
73 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
75 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
79 obj = (union acpi_object *)output.pointer;
81 if (obj->type == ACPI_TYPE_INTEGER)
82 if (obj->integer.value == 0x80000002) {
86 if (obj->type == ACPI_TYPE_BUFFER) {
87 if (obj->buffer.length == 4 && result) {
89 *result |= obj->buffer.pointer[0];
90 *result |= (obj->buffer.pointer[1] << 8);
91 *result |= (obj->buffer.pointer[2] << 16);
92 *result |= (obj->buffer.pointer[3] << 24);
96 kfree(output.pointer);
100 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
102 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
103 struct acpi_object_list input;
104 union acpi_object params[4];
105 union acpi_object *obj;
109 input.pointer = params;
110 params[0].type = ACPI_TYPE_BUFFER;
111 params[0].buffer.length = sizeof(nouveau_dsm_muid);
112 params[0].buffer.pointer = (char *)nouveau_dsm_muid;
113 params[1].type = ACPI_TYPE_INTEGER;
114 params[1].integer.value = 0x00000102;
115 params[2].type = ACPI_TYPE_INTEGER;
116 params[2].integer.value = func;
117 params[3].type = ACPI_TYPE_INTEGER;
118 params[3].integer.value = arg;
120 err = acpi_evaluate_object(handle, "_DSM", &input, &output);
122 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
126 obj = (union acpi_object *)output.pointer;
128 if (obj->type == ACPI_TYPE_INTEGER)
129 if (obj->integer.value == 0x80000002)
132 if (obj->type == ACPI_TYPE_BUFFER) {
133 if (obj->buffer.length == 4 && result) {
135 *result |= obj->buffer.pointer[0];
136 *result |= (obj->buffer.pointer[1] << 8);
137 *result |= (obj->buffer.pointer[2] << 16);
138 *result |= (obj->buffer.pointer[3] << 24);
142 kfree(output.pointer);
146 /* Returns 1 if a DSM function is usable and 0 otherwise */
147 static int nouveau_test_dsm(acpi_handle test_handle,
148 int (*dsm_func)(acpi_handle, int, int, uint32_t *),
153 /* Function 0 returns a Buffer containing available functions. The args
154 * parameter is ignored for function 0, so just put 0 in it */
155 if (dsm_func(test_handle, 0, 0, &result))
158 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
159 * the n-th bit is enabled, function n is supported */
160 return result & 1 && result & (1 << sfnc);
163 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
165 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
166 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
167 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
170 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
173 if (state == VGA_SWITCHEROO_ON)
174 arg = NOUVEAU_DSM_POWER_SPEED;
176 arg = NOUVEAU_DSM_POWER_STAMINA;
177 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
181 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
183 if (id == VGA_SWITCHEROO_IGD)
184 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
186 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
189 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
190 enum vga_switcheroo_state state)
192 if (id == VGA_SWITCHEROO_IGD)
195 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
198 static int nouveau_dsm_init(void)
203 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
205 /* easy option one - intel vendor ID means Integrated */
206 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
207 return VGA_SWITCHEROO_IGD;
209 /* is this device on Bus 0? - this may need improving */
210 if (pdev->bus->number == 0)
211 return VGA_SWITCHEROO_IGD;
213 return VGA_SWITCHEROO_DIS;
216 static struct vga_switcheroo_handler nouveau_dsm_handler = {
217 .switchto = nouveau_dsm_switchto,
218 .power_state = nouveau_dsm_power_state,
219 .init = nouveau_dsm_init,
220 .get_client_id = nouveau_dsm_get_client_id,
223 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
225 acpi_handle dhandle, nvidia_handle;
229 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
233 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
234 if (ACPI_FAILURE(status)) {
238 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
239 retval |= NOUVEAU_DSM_HAS_MUX;
241 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
242 NOUVEAU_DSM_OPTIMUS_FN))
243 retval |= NOUVEAU_DSM_HAS_OPT;
246 nouveau_dsm_priv.dhandle = dhandle;
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;
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 retval = nouveau_dsm_pci_probe(pdev);
274 if (retval & NOUVEAU_DSM_HAS_MUX)
276 if (retval & NOUVEAU_DSM_HAS_OPT)
280 if (vga_count == 2 && has_dsm && guid_valid) {
281 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
282 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
284 nouveau_dsm_priv.dsm_detected = true;
288 if (has_optimus == 1)
289 nouveau_dsm_priv.optimus_detected = true;
294 void nouveau_register_dsm_handler(void)
298 r = nouveau_dsm_detect();
302 vga_switcheroo_register_handler(&nouveau_dsm_handler);
305 void nouveau_unregister_dsm_handler(void)
307 vga_switcheroo_unregister_handler();
310 /* retrieve the ROM in 4k blocks */
311 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
315 union acpi_object rom_arg_elements[2], *obj;
316 struct acpi_object_list rom_arg;
317 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
320 rom_arg.pointer = &rom_arg_elements[0];
322 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
323 rom_arg_elements[0].integer.value = offset;
325 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
326 rom_arg_elements[1].integer.value = len;
328 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
329 if (ACPI_FAILURE(status)) {
330 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
333 obj = (union acpi_object *)buffer.pointer;
334 memcpy(bios+offset, obj->buffer.pointer, len);
335 kfree(buffer.pointer);
339 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
342 acpi_handle dhandle, rom_handle;
344 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
347 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
351 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
352 if (ACPI_FAILURE(status))
355 nouveau_dsm_priv.rom_handle = rom_handle;
359 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
361 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
365 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
367 struct nouveau_connector *nv_connector = nouveau_connector(connector);
368 struct acpi_device *acpidev;
373 switch (connector->connector_type) {
374 case DRM_MODE_CONNECTOR_LVDS:
375 case DRM_MODE_CONNECTOR_eDP:
376 type = ACPI_VIDEO_DISPLAY_LCD;
382 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
386 ret = acpi_bus_get_device(handle, &acpidev);
390 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
394 nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);