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_drm.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;
49 acpi_handle rom_handle;
52 bool nouveau_is_optimus(void) {
53 return nouveau_dsm_priv.optimus_detected;
56 bool nouveau_is_v1_dsm(void) {
57 return nouveau_dsm_priv.dsm_detected;
60 #define NOUVEAU_DSM_HAS_MUX 0x1
61 #define NOUVEAU_DSM_HAS_OPT 0x2
63 #ifdef CONFIG_VGA_SWITCHEROO
64 static const char nouveau_dsm_muid[] = {
65 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
66 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
69 static const char nouveau_op_dsm_muid[] = {
70 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
71 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
74 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
77 union acpi_object *obj;
79 union acpi_object argv4 = {
80 .buffer.type = ACPI_TYPE_BUFFER,
82 .buffer.pointer = args_buff
85 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
86 for (i = 0; i < 4; i++)
87 args_buff[i] = (arg >> i * 8) & 0xFF;
90 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
91 func, &argv4, ACPI_TYPE_BUFFER);
93 acpi_handle_info(handle, "failed to evaluate _DSM\n");
96 if (obj->buffer.length == 4) {
97 *result |= obj->buffer.pointer[0];
98 *result |= (obj->buffer.pointer[1] << 8);
99 *result |= (obj->buffer.pointer[2] << 16);
100 *result |= (obj->buffer.pointer[3] << 24);
109 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
110 * requirements on the fourth parameter, so a private implementation
111 * instead of using acpi_check_dsm().
113 static int nouveau_check_optimus_dsm(acpi_handle handle)
118 * Function 0 returns a Buffer containing available functions.
119 * The args parameter is ignored for function 0, so just put 0 in it
121 if (nouveau_optimus_dsm(handle, 0, 0, &result))
125 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
126 * If the n-th bit is enabled, function n is supported
128 return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
131 static int nouveau_dsm(acpi_handle handle, int func, int arg)
134 union acpi_object *obj;
135 union acpi_object argv4 = {
136 .integer.type = ACPI_TYPE_INTEGER,
137 .integer.value = arg,
140 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
141 func, &argv4, ACPI_TYPE_INTEGER);
143 acpi_handle_info(handle, "failed to evaluate _DSM\n");
146 if (obj->integer.value == 0x80000002)
154 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
156 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
157 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
158 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
161 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
164 if (state == VGA_SWITCHEROO_ON)
165 arg = NOUVEAU_DSM_POWER_SPEED;
167 arg = NOUVEAU_DSM_POWER_STAMINA;
168 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
172 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
174 if (!nouveau_dsm_priv.dsm_detected)
176 if (id == VGA_SWITCHEROO_IGD)
177 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
179 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
182 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
183 enum vga_switcheroo_state state)
185 if (id == VGA_SWITCHEROO_IGD)
188 /* Optimus laptops have the card already disabled in
189 * nouveau_switcheroo_set_state */
190 if (!nouveau_dsm_priv.dsm_detected)
193 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
196 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
198 /* easy option one - intel vendor ID means Integrated */
199 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
200 return VGA_SWITCHEROO_IGD;
202 /* is this device on Bus 0? - this may need improving */
203 if (pdev->bus->number == 0)
204 return VGA_SWITCHEROO_IGD;
206 return VGA_SWITCHEROO_DIS;
209 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
210 .switchto = nouveau_dsm_switchto,
211 .power_state = nouveau_dsm_power_state,
212 .get_client_id = nouveau_dsm_get_client_id,
215 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
220 dhandle = ACPI_HANDLE(&pdev->dev);
224 if (!acpi_has_method(dhandle, "_DSM"))
227 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
228 1 << NOUVEAU_DSM_POWER))
229 retval |= NOUVEAU_DSM_HAS_MUX;
231 if (nouveau_check_optimus_dsm(dhandle))
232 retval |= NOUVEAU_DSM_HAS_OPT;
234 if (retval & NOUVEAU_DSM_HAS_OPT) {
236 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
238 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
239 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
240 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
241 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
244 nouveau_dsm_priv.dhandle = dhandle;
249 static bool nouveau_dsm_detect(void)
251 char acpi_method_name[255] = { 0 };
252 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
253 struct pci_dev *pdev = NULL;
261 /* lookup the MXM GUID */
262 guid_valid = mxm_wmi_supported();
265 printk("MXM: GUID detected in BIOS\n");
267 /* now do DSM detection */
268 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
271 retval = nouveau_dsm_pci_probe(pdev);
272 if (retval & NOUVEAU_DSM_HAS_MUX)
274 if (retval & NOUVEAU_DSM_HAS_OPT)
278 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
281 retval = nouveau_dsm_pci_probe(pdev);
282 if (retval & NOUVEAU_DSM_HAS_MUX)
284 if (retval & NOUVEAU_DSM_HAS_OPT)
288 /* find the optimus DSM or the old v1 DSM */
289 if (has_optimus == 1) {
290 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
292 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
294 nouveau_dsm_priv.optimus_detected = true;
296 } else if (vga_count == 2 && has_dsm && guid_valid) {
297 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
299 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
301 nouveau_dsm_priv.dsm_detected = true;
309 void nouveau_register_dsm_handler(void)
313 r = nouveau_dsm_detect();
317 vga_switcheroo_register_handler(&nouveau_dsm_handler);
320 /* Must be called for Optimus models before the card can be turned off */
321 void nouveau_switcheroo_optimus_dsm(void)
324 if (!nouveau_dsm_priv.optimus_detected)
327 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
330 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
331 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &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 void nouveau_register_dsm_handler(void) {}
342 void nouveau_unregister_dsm_handler(void) {}
343 void nouveau_switcheroo_optimus_dsm(void) {}
346 /* retrieve the ROM in 4k blocks */
347 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
351 union acpi_object rom_arg_elements[2], *obj;
352 struct acpi_object_list rom_arg;
353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
356 rom_arg.pointer = &rom_arg_elements[0];
358 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
359 rom_arg_elements[0].integer.value = offset;
361 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
362 rom_arg_elements[1].integer.value = len;
364 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
365 if (ACPI_FAILURE(status)) {
366 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
369 obj = (union acpi_object *)buffer.pointer;
370 memcpy(bios+offset, obj->buffer.pointer, len);
371 kfree(buffer.pointer);
375 bool nouveau_acpi_rom_supported(struct device *dev)
378 acpi_handle dhandle, rom_handle;
380 dhandle = ACPI_HANDLE(dev);
384 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
385 if (ACPI_FAILURE(status))
388 nouveau_dsm_priv.rom_handle = rom_handle;
392 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
394 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
398 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
400 struct acpi_device *acpidev;
405 switch (connector->connector_type) {
406 case DRM_MODE_CONNECTOR_LVDS:
407 case DRM_MODE_CONNECTOR_eDP:
408 type = ACPI_VIDEO_DISPLAY_LCD;
414 handle = ACPI_HANDLE(&dev->pdev->dev);
418 ret = acpi_bus_get_device(handle, &acpidev);
422 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
426 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);