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_drv.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
;
48 bool optimus_flags_detected
;
49 bool optimus_skip_dsm
;
51 acpi_handle rom_handle
;
54 bool nouveau_is_optimus(void) {
55 return nouveau_dsm_priv
.optimus_detected
;
58 bool nouveau_is_v1_dsm(void) {
59 return nouveau_dsm_priv
.dsm_detected
;
62 #ifdef CONFIG_VGA_SWITCHEROO
63 static const guid_t nouveau_dsm_muid
=
64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
67 static const guid_t nouveau_op_dsm_muid
=
68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
71 static int nouveau_optimus_dsm(acpi_handle handle
, int func
, int arg
, uint32_t *result
)
74 union acpi_object
*obj
;
76 union acpi_object argv4
= {
77 .buffer
.type
= ACPI_TYPE_BUFFER
,
79 .buffer
.pointer
= args_buff
82 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
83 for (i
= 0; i
< 4; i
++)
84 args_buff
[i
] = (arg
>> i
* 8) & 0xFF;
87 obj
= acpi_evaluate_dsm_typed(handle
, &nouveau_op_dsm_muid
, 0x00000100,
88 func
, &argv4
, ACPI_TYPE_BUFFER
);
90 acpi_handle_info(handle
, "failed to evaluate _DSM\n");
93 if (obj
->buffer
.length
== 4) {
94 *result
|= obj
->buffer
.pointer
[0];
95 *result
|= (obj
->buffer
.pointer
[1] << 8);
96 *result
|= (obj
->buffer
.pointer
[2] << 16);
97 *result
|= (obj
->buffer
.pointer
[3] << 24);
106 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
107 * requirements on the fourth parameter, so a private implementation
108 * instead of using acpi_check_dsm().
110 static int nouveau_dsm_get_optimus_functions(acpi_handle handle
)
115 * Function 0 returns a Buffer containing available functions.
116 * The args parameter is ignored for function 0, so just put 0 in it
118 if (nouveau_optimus_dsm(handle
, 0, 0, &result
))
122 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
123 * If the n-th bit is enabled, function n is supported
125 if (result
& 1 && result
& (1 << NOUVEAU_DSM_OPTIMUS_CAPS
))
130 static int nouveau_dsm(acpi_handle handle
, int func
, int arg
)
133 union acpi_object
*obj
;
134 union acpi_object argv4
= {
135 .integer
.type
= ACPI_TYPE_INTEGER
,
136 .integer
.value
= arg
,
139 obj
= acpi_evaluate_dsm_typed(handle
, &nouveau_dsm_muid
, 0x00000102,
140 func
, &argv4
, ACPI_TYPE_INTEGER
);
142 acpi_handle_info(handle
, "failed to evaluate _DSM\n");
145 if (obj
->integer
.value
== 0x80000002)
153 static int nouveau_dsm_switch_mux(acpi_handle handle
, int mux_id
)
155 mxm_wmi_call_mxmx(mux_id
== NOUVEAU_DSM_LED_STAMINA
? MXM_MXDS_ADAPTER_IGD
: MXM_MXDS_ADAPTER_0
);
156 mxm_wmi_call_mxds(mux_id
== NOUVEAU_DSM_LED_STAMINA
? MXM_MXDS_ADAPTER_IGD
: MXM_MXDS_ADAPTER_0
);
157 return nouveau_dsm(handle
, NOUVEAU_DSM_LED
, mux_id
);
160 static int nouveau_dsm_set_discrete_state(acpi_handle handle
, enum vga_switcheroo_state state
)
163 if (state
== VGA_SWITCHEROO_ON
)
164 arg
= NOUVEAU_DSM_POWER_SPEED
;
166 arg
= NOUVEAU_DSM_POWER_STAMINA
;
167 nouveau_dsm(handle
, NOUVEAU_DSM_POWER
, arg
);
171 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id
)
173 if (!nouveau_dsm_priv
.dsm_detected
)
175 if (id
== VGA_SWITCHEROO_IGD
)
176 return nouveau_dsm_switch_mux(nouveau_dsm_priv
.dhandle
, NOUVEAU_DSM_LED_STAMINA
);
178 return nouveau_dsm_switch_mux(nouveau_dsm_priv
.dhandle
, NOUVEAU_DSM_LED_SPEED
);
181 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id
,
182 enum vga_switcheroo_state state
)
184 if (id
== VGA_SWITCHEROO_IGD
)
187 /* Optimus laptops have the card already disabled in
188 * nouveau_switcheroo_set_state */
189 if (!nouveau_dsm_priv
.dsm_detected
)
192 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv
.dhandle
, state
);
195 static int nouveau_dsm_get_client_id(struct pci_dev
*pdev
)
197 /* easy option one - intel vendor ID means Integrated */
198 if (pdev
->vendor
== PCI_VENDOR_ID_INTEL
)
199 return VGA_SWITCHEROO_IGD
;
201 /* is this device on Bus 0? - this may need improving */
202 if (pdev
->bus
->number
== 0)
203 return VGA_SWITCHEROO_IGD
;
205 return VGA_SWITCHEROO_DIS
;
208 static const struct vga_switcheroo_handler nouveau_dsm_handler
= {
209 .switchto
= nouveau_dsm_switchto
,
210 .power_state
= nouveau_dsm_power_state
,
211 .get_client_id
= nouveau_dsm_get_client_id
,
215 * Firmware supporting Windows 8 or later do not use _DSM to put the device into
216 * D3cold, they instead rely on disabling power resources on the parent.
218 static bool nouveau_pr3_present(struct pci_dev
*pdev
)
220 struct pci_dev
*parent_pdev
= pci_upstream_bridge(pdev
);
221 struct acpi_device
*parent_adev
;
226 if (!parent_pdev
->bridge_d3
) {
228 * Parent PCI bridge is currently not power managed.
229 * Since userspace can change these afterwards to be on
230 * the safe side we stick with _DSM and prevent usage of
231 * _PR3 from the bridge.
233 pci_d3cold_disable(pdev
);
237 parent_adev
= ACPI_COMPANION(&parent_pdev
->dev
);
241 return parent_adev
->power
.flags
.power_resources
&&
242 acpi_has_method(parent_adev
->handle
, "_PR3");
245 static void nouveau_dsm_pci_probe(struct pci_dev
*pdev
, acpi_handle
*dhandle_out
,
246 bool *has_mux
, bool *has_opt
,
247 bool *has_opt_flags
, bool *has_pr3
)
253 dhandle
= ACPI_HANDLE(&pdev
->dev
);
257 if (!acpi_has_method(dhandle
, "_DSM"))
260 supports_mux
= acpi_check_dsm(dhandle
, &nouveau_dsm_muid
, 0x00000102,
261 1 << NOUVEAU_DSM_POWER
);
262 optimus_funcs
= nouveau_dsm_get_optimus_functions(dhandle
);
264 /* Does not look like a Nvidia device. */
265 if (!supports_mux
&& !optimus_funcs
)
268 *dhandle_out
= dhandle
;
269 *has_mux
= supports_mux
;
270 *has_opt
= !!optimus_funcs
;
271 *has_opt_flags
= optimus_funcs
& (1 << NOUVEAU_DSM_OPTIMUS_FLAGS
);
276 nouveau_optimus_dsm(dhandle
, NOUVEAU_DSM_OPTIMUS_CAPS
, 0,
278 dev_info(&pdev
->dev
, "optimus capabilities: %s, status %s%s\n",
279 (result
& OPTIMUS_ENABLED
) ? "enabled" : "disabled",
280 (result
& OPTIMUS_DYNAMIC_PWR_CAP
) ? "dynamic power, " : "",
281 (result
& OPTIMUS_HDA_CODEC_MASK
) ? "hda bios codec supported" : "");
283 *has_pr3
= nouveau_pr3_present(pdev
);
287 static bool nouveau_dsm_detect(void)
289 char acpi_method_name
[255] = { 0 };
290 struct acpi_buffer buffer
= {sizeof(acpi_method_name
), acpi_method_name
};
291 struct pci_dev
*pdev
= NULL
;
292 acpi_handle dhandle
= NULL
;
293 bool has_mux
= false;
294 bool has_optimus
= false;
295 bool has_optimus_flags
= false;
296 bool has_power_resources
= false;
301 /* lookup the MXM GUID */
302 guid_valid
= mxm_wmi_supported();
305 printk("MXM: GUID detected in BIOS\n");
307 /* now do DSM detection */
308 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, pdev
)) != NULL
) {
311 nouveau_dsm_pci_probe(pdev
, &dhandle
, &has_mux
, &has_optimus
,
312 &has_optimus_flags
, &has_power_resources
);
315 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_3D
<< 8, pdev
)) != NULL
) {
318 nouveau_dsm_pci_probe(pdev
, &dhandle
, &has_mux
, &has_optimus
,
319 &has_optimus_flags
, &has_power_resources
);
322 /* find the optimus DSM or the old v1 DSM */
324 nouveau_dsm_priv
.dhandle
= dhandle
;
325 acpi_get_name(nouveau_dsm_priv
.dhandle
, ACPI_FULL_PATHNAME
,
327 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
329 if (has_power_resources
)
330 pr_info("nouveau: detected PR support, will not use DSM\n");
331 nouveau_dsm_priv
.optimus_detected
= true;
332 nouveau_dsm_priv
.optimus_flags_detected
= has_optimus_flags
;
333 nouveau_dsm_priv
.optimus_skip_dsm
= has_power_resources
;
335 } else if (vga_count
== 2 && has_mux
&& guid_valid
) {
336 nouveau_dsm_priv
.dhandle
= dhandle
;
337 acpi_get_name(nouveau_dsm_priv
.dhandle
, ACPI_FULL_PATHNAME
,
339 pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
341 nouveau_dsm_priv
.dsm_detected
= true;
349 void nouveau_register_dsm_handler(void)
353 r
= nouveau_dsm_detect();
357 vga_switcheroo_register_handler(&nouveau_dsm_handler
, 0);
360 /* Must be called for Optimus models before the card can be turned off */
361 void nouveau_switcheroo_optimus_dsm(void)
364 if (!nouveau_dsm_priv
.optimus_detected
|| nouveau_dsm_priv
.optimus_skip_dsm
)
367 if (nouveau_dsm_priv
.optimus_flags_detected
)
368 nouveau_optimus_dsm(nouveau_dsm_priv
.dhandle
, NOUVEAU_DSM_OPTIMUS_FLAGS
,
371 nouveau_optimus_dsm(nouveau_dsm_priv
.dhandle
, NOUVEAU_DSM_OPTIMUS_CAPS
,
372 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN
, &result
);
376 void nouveau_unregister_dsm_handler(void)
378 if (nouveau_dsm_priv
.optimus_detected
|| nouveau_dsm_priv
.dsm_detected
)
379 vga_switcheroo_unregister_handler();
382 void nouveau_register_dsm_handler(void) {}
383 void nouveau_unregister_dsm_handler(void) {}
384 void nouveau_switcheroo_optimus_dsm(void) {}
387 /* retrieve the ROM in 4k blocks */
388 static int nouveau_rom_call(acpi_handle rom_handle
, uint8_t *bios
,
392 union acpi_object rom_arg_elements
[2], *obj
;
393 struct acpi_object_list rom_arg
;
394 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
397 rom_arg
.pointer
= &rom_arg_elements
[0];
399 rom_arg_elements
[0].type
= ACPI_TYPE_INTEGER
;
400 rom_arg_elements
[0].integer
.value
= offset
;
402 rom_arg_elements
[1].type
= ACPI_TYPE_INTEGER
;
403 rom_arg_elements
[1].integer
.value
= len
;
405 status
= acpi_evaluate_object(rom_handle
, NULL
, &rom_arg
, &buffer
);
406 if (ACPI_FAILURE(status
)) {
407 pr_info("failed to evaluate ROM got %s\n",
408 acpi_format_exception(status
));
411 obj
= (union acpi_object
*)buffer
.pointer
;
412 len
= min(len
, (int)obj
->buffer
.length
);
413 memcpy(bios
+offset
, obj
->buffer
.pointer
, len
);
414 kfree(buffer
.pointer
);
418 bool nouveau_acpi_rom_supported(struct device
*dev
)
421 acpi_handle dhandle
, rom_handle
;
423 dhandle
= ACPI_HANDLE(dev
);
427 status
= acpi_get_handle(dhandle
, "_ROM", &rom_handle
);
428 if (ACPI_FAILURE(status
))
431 nouveau_dsm_priv
.rom_handle
= rom_handle
;
435 int nouveau_acpi_get_bios_chunk(uint8_t *bios
, int offset
, int len
)
437 return nouveau_rom_call(nouveau_dsm_priv
.rom_handle
, bios
, offset
, len
);
441 nouveau_acpi_edid(struct drm_device
*dev
, struct drm_connector
*connector
)
443 struct acpi_device
*acpidev
;
448 switch (connector
->connector_type
) {
449 case DRM_MODE_CONNECTOR_LVDS
:
450 case DRM_MODE_CONNECTOR_eDP
:
451 type
= ACPI_VIDEO_DISPLAY_LCD
;
457 handle
= ACPI_HANDLE(&dev
->pdev
->dev
);
461 ret
= acpi_bus_get_device(handle
, &acpidev
);
465 ret
= acpi_video_get_edid(acpidev
, type
, -1, &edid
);
469 return kmemdup(edid
, EDID_LENGTH
, GFP_KERNEL
);