[linux-2.6-block.git] / drivers / gpu / drm / nouveau / nouveau_acpi.c

// SPDX-License-Identifier: MIT
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/mxm-wmi.h>
#include <linux/vga_switcheroo.h>
#include <drm/drm_edid.h>
#include <acpi/video.h>

#include "nouveau_drv.h"
#include "nouveau_acpi.h"

#define NOUVEAU_DSM_LED 0x02
#define NOUVEAU_DSM_LED_STATE 0x00
#define NOUVEAU_DSM_LED_OFF 0x10
#define NOUVEAU_DSM_LED_STAMINA 0x11
#define NOUVEAU_DSM_LED_SPEED 0x12

#define NOUVEAU_DSM_POWER 0x03
#define NOUVEAU_DSM_POWER_STATE 0x00
#define NOUVEAU_DSM_POWER_SPEED 0x01
#define NOUVEAU_DSM_POWER_STAMINA 0x02

#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B

#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)

#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)

/* result of the optimus caps function */
#define OPTIMUS_ENABLED (1 << 0)
#define OPTIMUS_STATUS_MASK (3 << 3)
#define OPTIMUS_STATUS_OFF  (0 << 3)
#define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
#define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
#define OPTIMUS_CAPS_MASK (7 << 24)
#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)

#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */

static struct nouveau_dsm_priv {
	bool dsm_detected;
	bool optimus_detected;
	bool optimus_flags_detected;
	bool optimus_skip_dsm;
	acpi_handle dhandle;
} nouveau_dsm_priv;

bool nouveau_is_optimus(void) {
	return nouveau_dsm_priv.optimus_detected;
}

bool nouveau_is_v1_dsm(void) {
	return nouveau_dsm_priv.dsm_detected;
}

#ifdef CONFIG_VGA_SWITCHEROO
static const guid_t nouveau_dsm_muid =
	GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
		  0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);

static const guid_t nouveau_op_dsm_muid =
	GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
		  0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);

static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
{
	int i;
	union acpi_object *obj;
	char args_buff[4];
	union acpi_object argv4 = {
		.buffer.type = ACPI_TYPE_BUFFER,
		.buffer.length = 4,
		.buffer.pointer = args_buff
	};

	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	for (i = 0; i < 4; i++)
		args_buff[i] = (arg >> i * 8) & 0xFF;

	*result = 0;
	obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
				      func, &argv4, ACPI_TYPE_BUFFER);
	if (!obj) {
		acpi_handle_info(handle, "failed to evaluate _DSM\n");
		return AE_ERROR;
	} else {
		if (obj->buffer.length == 4) {
			*result |= obj->buffer.pointer[0];
			*result |= (obj->buffer.pointer[1] << 8);
			*result |= (obj->buffer.pointer[2] << 16);
			*result |= (obj->buffer.pointer[3] << 24);
		}
		ACPI_FREE(obj);
	}

	return 0;
}

/*
 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 * requirements on the fourth parameter, so a private implementation
 * instead of using acpi_check_dsm().
 */
static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
{
	int result;

	/*
	 * Function 0 returns a Buffer containing available functions.
	 * The args parameter is ignored for function 0, so just put 0 in it
	 */
	if (nouveau_optimus_dsm(handle, 0, 0, &result))
		return 0;

	/*
	 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
	 * If the n-th bit is enabled, function n is supported
	 */
	if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
		return result;
	return 0;
}

static int nouveau_dsm(acpi_handle handle, int func, int arg)
{
	int ret = 0;
	union acpi_object *obj;
	union acpi_object argv4 = {
		.integer.type = ACPI_TYPE_INTEGER,
		.integer.value = arg,
	};

	obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
				      func, &argv4, ACPI_TYPE_INTEGER);
	if (!obj) {
		acpi_handle_info(handle, "failed to evaluate _DSM\n");
		return AE_ERROR;
	} else {
		if (obj->integer.value == 0x80000002)
			ret = -ENODEV;
		ACPI_FREE(obj);
	}

	return ret;
}

static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
{
	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
}

static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
{
	int arg;
	if (state == VGA_SWITCHEROO_ON)
		arg = NOUVEAU_DSM_POWER_SPEED;
	else
		arg = NOUVEAU_DSM_POWER_STAMINA;
	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
	return 0;
}

static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
	if (!nouveau_dsm_priv.dsm_detected)
		return 0;
	if (id == VGA_SWITCHEROO_IGD)
		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
	else
		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
}

static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
				   enum vga_switcheroo_state state)
{
	if (id == VGA_SWITCHEROO_IGD)
		return 0;

	/* Optimus laptops have the card already disabled in
	 * nouveau_switcheroo_set_state */
	if (!nouveau_dsm_priv.dsm_detected)
		return 0;

	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
}

static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
{
	/* easy option one - intel vendor ID means Integrated */
	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
		return VGA_SWITCHEROO_IGD;

	/* is this device on Bus 0? - this may need improving */
	if (pdev->bus->number == 0)
		return VGA_SWITCHEROO_IGD;

	return VGA_SWITCHEROO_DIS;
}

static const struct vga_switcheroo_handler nouveau_dsm_handler = {
	.switchto = nouveau_dsm_switchto,
	.power_state = nouveau_dsm_power_state,
	.get_client_id = nouveau_dsm_get_client_id,
};

static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
				  bool *has_mux, bool *has_opt,
				  bool *has_opt_flags, bool *has_pr3)
{
	acpi_handle dhandle;
	bool supports_mux;
	int optimus_funcs;
	struct pci_dev *parent_pdev;

	*has_pr3 = false;
	parent_pdev = pci_upstream_bridge(pdev);
	if (parent_pdev) {
		if (parent_pdev->bridge_d3)
			*has_pr3 = pci_pr3_present(parent_pdev);
		else
			pci_d3cold_disable(pdev);
	}

	dhandle = ACPI_HANDLE(&pdev->dev);
	if (!dhandle)
		return;

	if (!acpi_has_method(dhandle, "_DSM"))
		return;

	supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
				      1 << NOUVEAU_DSM_POWER);
	optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);

	/* Does not look like a Nvidia device. */
	if (!supports_mux && !optimus_funcs)
		return;

	*dhandle_out = dhandle;
	*has_mux = supports_mux;
	*has_opt = !!optimus_funcs;
	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);

	if (optimus_funcs) {
		uint32_t result;
		nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
				    &result);
		dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
			 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
			 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
			 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
	}
}

static bool nouveau_dsm_detect(void)
{
	char acpi_method_name[255] = { 0 };
	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	struct pci_dev *pdev = NULL;
	acpi_handle dhandle = NULL;
	bool has_mux = false;
	bool has_optimus = false;
	bool has_optimus_flags = false;
	bool has_power_resources = false;
	int vga_count = 0;
	bool guid_valid;
	bool ret = false;

	/* lookup the MXM GUID */
	guid_valid = mxm_wmi_supported();

	if (guid_valid)
		printk("MXM: GUID detected in BIOS\n");

	/* now do DSM detection */
	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
		vga_count++;

		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
				      &has_optimus_flags, &has_power_resources);
	}

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
		vga_count++;

		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
				      &has_optimus_flags, &has_power_resources);
	}

	/* find the optimus DSM or the old v1 DSM */
	if (has_optimus) {
		nouveau_dsm_priv.dhandle = dhandle;
		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
			&buffer);
		pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
			acpi_method_name);
		if (has_power_resources)
			pr_info("nouveau: detected PR support, will not use DSM\n");
		nouveau_dsm_priv.optimus_detected = true;
		nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
		nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
		ret = true;
	} else if (vga_count == 2 && has_mux && guid_valid) {
		nouveau_dsm_priv.dhandle = dhandle;
		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
			&buffer);
		pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
			acpi_method_name);
		nouveau_dsm_priv.dsm_detected = true;
		ret = true;
	}


	return ret;
}

void nouveau_register_dsm_handler(void)
{
	bool r;

	r = nouveau_dsm_detect();
	if (!r)
		return;

	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
}

/* Must be called for Optimus models before the card can be turned off */
void nouveau_switcheroo_optimus_dsm(void)
{
	u32 result = 0;
	if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
		return;

	if (nouveau_dsm_priv.optimus_flags_detected)
		nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
				    0x3, &result);

	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
		NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);

}

void nouveau_unregister_dsm_handler(void)
{
	if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
		vga_switcheroo_unregister_handler();
}
#else
void nouveau_register_dsm_handler(void) {}
void nouveau_unregister_dsm_handler(void) {}
void nouveau_switcheroo_optimus_dsm(void) {}
#endif

void *
nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
{
	struct acpi_device *acpidev;
	int type, ret;
	void *edid;

	switch (connector->connector_type) {
	case DRM_MODE_CONNECTOR_LVDS:
	case DRM_MODE_CONNECTOR_eDP:
		type = ACPI_VIDEO_DISPLAY_LCD;
		break;
	default:
		return NULL;
	}

	acpidev = ACPI_COMPANION(dev->dev);
	if (!acpidev)
		return NULL;

	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	if (ret < 0)
		return NULL;

	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
}

bool nouveau_acpi_video_backlight_use_native(void)
{
	return acpi_video_backlight_use_native();
}
Commit	Line	Data
b7019ac5	1	// SPDX-License-Identifier: MIT
6ee73861 BS	2	#include <linux/pci.h>
6ee73861 BS	3	#include <linux/acpi.h>
5a0e3ad6	4	#include <linux/slab.h>
8116188f	5	#include <linux/mxm-wmi.h>
6a9ee8af	6	#include <linux/vga_switcheroo.h>
612a9aab	7	#include <drm/drm_edid.h>
8b48463f	8	#include <acpi/video.h>
c0077061	9
4dc28134	10	#include "nouveau_drv.h"
c0077061 BS	11	#include "nouveau_acpi.h"
c0077061 BS	12
6ee73861 BS	13	#define NOUVEAU_DSM_LED 0x02
	14	#define NOUVEAU_DSM_LED_STATE 0x00
	15	#define NOUVEAU_DSM_LED_OFF 0x10
	16	#define NOUVEAU_DSM_LED_STAMINA 0x11
	17	#define NOUVEAU_DSM_LED_SPEED 0x12
	18
	19	#define NOUVEAU_DSM_POWER 0x03
	20	#define NOUVEAU_DSM_POWER_STATE 0x00
	21	#define NOUVEAU_DSM_POWER_SPEED 0x01
	22	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	23
5addcf0a DA	24	#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
	25	#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
	26
	27	#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
	28	#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
	29	#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
	30
	31	#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 \| NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
	32
	33	/* result of the optimus caps function */
	34	#define OPTIMUS_ENABLED (1 << 0)
	35	#define OPTIMUS_STATUS_MASK (3 << 3)
	36	#define OPTIMUS_STATUS_OFF (0 << 3)
	37	#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
	38	#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
	39	#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
	40	#define OPTIMUS_CAPS_MASK (7 << 24)
	41	#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
	42
	43	#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
	44	#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
d099230c	45
6a9ee8af DA	46	static struct nouveau_dsm_priv {
6a9ee8af DA	47	bool dsm_detected;
f19467c5	48	bool optimus_detected;
cba97805	49	bool optimus_flags_detected;
692a17dc	50	bool optimus_skip_dsm;
6a9ee8af	51	acpi_handle dhandle;
6a9ee8af DA	52	} nouveau_dsm_priv;
6a9ee8af DA	53
c839d748 DA	54	bool nouveau_is_optimus(void) {
	55	return nouveau_dsm_priv.optimus_detected;
	56	}
	57
	58	bool nouveau_is_v1_dsm(void) {
	59	return nouveau_dsm_priv.dsm_detected;
	60	}
	61
d0ce7b85	62	#ifdef CONFIG_VGA_SWITCHEROO
94116f81 AS	63	static const guid_t nouveau_dsm_muid =
	64	GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
	65	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
6ee73861	66
94116f81 AS	67	static const guid_t nouveau_op_dsm_muid =
	68	GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
	69	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
f19467c5 DA	70
	71	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	72	{
b072e53b	73	int i;
f19467c5	74	union acpi_object *obj;
d099230c	75	char args_buff[4];
b072e53b JL	76	union acpi_object argv4 = {
	77	.buffer.type = ACPI_TYPE_BUFFER,
	78	.buffer.length = 4,
	79	.buffer.pointer = args_buff
	80	};
f19467c5	81
d099230c PL	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;
f19467c5	85
b072e53b	86	*result = 0;
94116f81	87	obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
b072e53b JL	88	func, &argv4, ACPI_TYPE_BUFFER);
	89	if (!obj) {
	90	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	91	return AE_ERROR;
	92	} else {
	93	if (obj->buffer.length == 4) {
f19467c5 DA	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);
	98	}
b072e53b	99	ACPI_FREE(obj);
f19467c5 DA	100	}
f19467c5 DA	101
f19467c5 DA	102	return 0;
	103	}
	104
e284175a JL	105	/*
	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().
	109	*/
a12e78dd	110	static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
e284175a JL	111	{
	112	int result;
	113
	114	/*
	115	* Function 0 returns a Buffer containing available functions.
	116	* The args parameter is ignored for function 0, so just put 0 in it
	117	*/
	118	if (nouveau_optimus_dsm(handle, 0, 0, &result))
	119	return 0;
	120
	121	/*
	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
	124	*/
a12e78dd PW	125	if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
	126	return result;
	127	return 0;
e284175a JL	128	}
e284175a JL	129
b072e53b	130	static int nouveau_dsm(acpi_handle handle, int func, int arg)
6a9ee8af	131	{
b072e53b	132	int ret = 0;
6ee73861	133	union acpi_object *obj;
b072e53b JL	134	union acpi_object argv4 = {
	135	.integer.type = ACPI_TYPE_INTEGER,
	136	.integer.value = arg,
	137	};
	138
94116f81	139	obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
b072e53b JL	140	func, &argv4, ACPI_TYPE_INTEGER);
	141	if (!obj) {
	142	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	143	return AE_ERROR;
	144	} else {
6ee73861	145	if (obj->integer.value == 0x80000002)
b072e53b JL	146	ret = -ENODEV;
b072e53b JL	147	ACPI_FREE(obj);
6ee73861 BS	148	}
6ee73861 BS	149
b072e53b	150	return ret;
9075e85f PL	151	}
9075e85f PL	152
6a9ee8af	153	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	154	{
000703f4	155	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	156	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
b072e53b	157	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
6a9ee8af DA	158	}
	159
	160	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	161	{
	162	int arg;
	163	if (state == VGA_SWITCHEROO_ON)
	164	arg = NOUVEAU_DSM_POWER_SPEED;
	165	else
	166	arg = NOUVEAU_DSM_POWER_STAMINA;
b072e53b	167	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
6a9ee8af DA	168	return 0;
	169	}
	170
	171	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	172	{
c839d748	173	if (!nouveau_dsm_priv.dsm_detected)
d099230c	174	return 0;
6a9ee8af	175	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	176	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	177	else
fc5ea29d	178	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	179	}
6ee73861	180
6a9ee8af DA	181	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	182	enum vga_switcheroo_state state)
	183	{
	184	if (id == VGA_SWITCHEROO_IGD)
	185	return 0;
	186
d099230c PL	187	/* Optimus laptops have the card already disabled in
d099230c PL	188	* nouveau_switcheroo_set_state */
c839d748	189	if (!nouveau_dsm_priv.dsm_detected)
d099230c PL	190	return 0;
d099230c PL	191
fc5ea29d	192	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	193	}
6a9ee8af DA	194
f43cda5c	195	static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	196	{
d1fbd923 DA	197	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	198	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	199	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	200
	201	/* is this device on Bus 0? - this may need improving */
	202	if (pdev->bus->number == 0)
	203	return VGA_SWITCHEROO_IGD;
	204
	205	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	206	}
6a9ee8af DA	207
5d170139	208	static const struct vga_switcheroo_handler nouveau_dsm_handler = {
6a9ee8af DA	209	.switchto = nouveau_dsm_switchto,
6a9ee8af DA	210	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	211	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	212	};
6ee73861	213
df42194a	214	static void nouveau_dsm_pci_probe(struct pci_dev pdev, acpi_handle dhandle_out,
cba97805	215	bool has_mux, bool has_opt,
692a17dc	216	bool has_opt_flags, bool has_pr3)
6a9ee8af	217	{
187b5b5d	218	acpi_handle dhandle;
df42194a	219	bool supports_mux;
a12e78dd	220	int optimus_funcs;
ccfc2d5c KHF	221	struct pci_dev *parent_pdev;
	222
	223	*has_pr3 = false;
	224	parent_pdev = pci_upstream_bridge(pdev);
	225	if (parent_pdev) {
	226	if (parent_pdev->bridge_d3)
	227	*has_pr3 = pci_pr3_present(parent_pdev);
	228	else
	229	pci_d3cold_disable(pdev);
	230	}
6a9ee8af	231
3a83f992	232	dhandle = ACPI_HANDLE(&pdev->dev);
6a9ee8af	233	if (!dhandle)
df42194a	234	return;
afeb3e11	235
f91ce35e	236	if (!acpi_has_method(dhandle, "_DSM"))
df42194a PW	237	return;
df42194a PW	238
94116f81	239	supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
df42194a	240	1 << NOUVEAU_DSM_POWER);
a12e78dd	241	optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
f91ce35e	242
df42194a	243	/* Does not look like a Nvidia device. */
a12e78dd	244	if (!supports_mux && !optimus_funcs)
df42194a	245	return;
f19467c5	246
df42194a PW	247	*dhandle_out = dhandle;
df42194a PW	248	*has_mux = supports_mux;
a12e78dd	249	*has_opt = !!optimus_funcs;
cba97805	250	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
f19467c5	251
a12e78dd	252	if (optimus_funcs) {
5addcf0a DA	253	uint32_t result;
	254	nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
	255	&result);
	256	dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
	257	(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
	258	(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
	259	(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
	260	}
6ee73861	261	}
6a9ee8af DA	262
	263	static bool nouveau_dsm_detect(void)
	264	{
	265	char acpi_method_name[255] = { 0 };
	266	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	267	struct pci_dev *pdev = NULL;
df42194a PW	268	acpi_handle dhandle = NULL;
	269	bool has_mux = false;
	270	bool has_optimus = false;
cba97805	271	bool has_optimus_flags = false;
692a17dc	272	bool has_power_resources = false;
6a9ee8af	273	int vga_count = 0;
8116188f	274	bool guid_valid;
f19467c5	275	bool ret = false;
8116188f	276
f19467c5	277	/* lookup the MXM GUID */
8116188f	278	guid_valid = mxm_wmi_supported();
8116188f	279
f19467c5 DA	280	if (guid_valid)
f19467c5 DA	281	printk("MXM: GUID detected in BIOS\n");
afeb3e11	282
f19467c5	283	/* now do DSM detection */
6a9ee8af DA	284	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	285	vga_count++;
	286
cba97805	287	nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
692a17dc	288	&has_optimus_flags, &has_power_resources);
6a9ee8af DA	289	}
6a9ee8af DA	290
4c60fac1 EV	291	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	292	vga_count++;
	293
cba97805	294	nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
692a17dc	295	&has_optimus_flags, &has_power_resources);
4c60fac1 EV	296	}
4c60fac1 EV	297
c839d748	298	/* find the optimus DSM or the old v1 DSM */
df42194a PW	299	if (has_optimus) {
df42194a PW	300	nouveau_dsm_priv.dhandle = dhandle;
d099230c PL	301	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	302	&buffer);
8dfe162a	303	pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
d099230c	304	acpi_method_name);
692a17dc PW	305	if (has_power_resources)
692a17dc PW	306	pr_info("nouveau: detected PR support, will not use DSM\n");
c839d748	307	nouveau_dsm_priv.optimus_detected = true;
cba97805	308	nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
692a17dc	309	nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
f19467c5	310	ret = true;
df42194a PW	311	} else if (vga_count == 2 && has_mux && guid_valid) {
df42194a PW	312	nouveau_dsm_priv.dhandle = dhandle;
d099230c PL	313	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	314	&buffer);
8dfe162a	315	pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	316	acpi_method_name);
c839d748	317	nouveau_dsm_priv.dsm_detected = true;
d099230c PL	318	ret = true;
d099230c PL	319	}
f19467c5	320
c839d748	321
f19467c5	322	return ret;
6a9ee8af DA	323	}
	324
	325	void nouveau_register_dsm_handler(void)
	326	{
	327	bool r;
	328
	329	r = nouveau_dsm_detect();
	330	if (!r)
	331	return;
	332
156d7d41	333	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
6a9ee8af DA	334	}
6a9ee8af DA	335
d099230c PL	336	/* Must be called for Optimus models before the card can be turned off */
	337	void nouveau_switcheroo_optimus_dsm(void)
	338	{
	339	u32 result = 0;
692a17dc	340	if (!nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.optimus_skip_dsm)
d099230c PL	341	return;
d099230c PL	342
cba97805 PW	343	if (nouveau_dsm_priv.optimus_flags_detected)
	344	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
	345	0x3, &result);
5addcf0a DA	346
	347	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
	348	NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
	349
d099230c PL	350	}
d099230c PL	351
6a9ee8af DA	352	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	353	{
2f3787aa AH	354	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	355	vga_switcheroo_unregister_handler();
6a9ee8af	356	}
d0ce7b85 JM	357	#else
	358	void nouveau_register_dsm_handler(void) {}
	359	void nouveau_unregister_dsm_handler(void) {}
	360	void nouveau_switcheroo_optimus_dsm(void) {}
	361	#endif
afeb3e11	362
c0077061	363	void *
a6ed76d7 BS	364	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	365	{
a6ed76d7	366	struct acpi_device *acpidev;
a6ed76d7 BS	367	int type, ret;
	368	void *edid;
	369
	370	switch (connector->connector_type) {
	371	case DRM_MODE_CONNECTOR_LVDS:
	372	case DRM_MODE_CONNECTOR_eDP:
	373	type = ACPI_VIDEO_DISPLAY_LCD;
	374	break;
	375	default:
c0077061	376	return NULL;
a6ed76d7 BS	377	}
a6ed76d7 BS	378
ae364fd9 RW	379	acpidev = ACPI_COMPANION(dev->dev);
ae364fd9 RW	380	if (!acpidev)
c0077061	381	return NULL;
a6ed76d7 BS	382
	383	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	384	if (ret < 0)
c0077061	385	return NULL;
a6ed76d7	386
c0077061	387	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	388	}
7f908d33 HG	389
	390	bool nouveau_acpi_video_backlight_use_native(void)
	391	{
	392	return acpi_video_backlight_use_native();
	393	}