[deliverable/linux.git] / drivers / gpu / drm / nouveau / nouveau_acpi.c

#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;
	acpi_handle rom_handle;
} 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 char nouveau_dsm_muid[] = {
	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
};

static const char nouveau_op_dsm_muid[] = {
	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	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 int 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,
};

/*
 * Firmware supporting Windows 8 or later do not use _DSM to put the device into
 * D3cold, they instead rely on disabling power resources on the parent.
 */
static bool nouveau_pr3_present(struct pci_dev *pdev)
{
	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
	struct acpi_device *parent_adev;

	if (!parent_pdev)
		return false;

	parent_adev = ACPI_COMPANION(&parent_pdev->dev);
	if (!parent_adev)
		return false;

	return acpi_has_method(parent_adev->handle, "_PR3");
}

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;

	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);
	*has_pr3 = false;

	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" : "");

		*has_pr3 = nouveau_pr3_present(pdev);
	}
}

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);
		printk(KERN_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);
		printk(KERN_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

/* retrieve the ROM in 4k blocks */
static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
			    int offset, int len)
{
	acpi_status status;
	union acpi_object rom_arg_elements[2], *obj;
	struct acpi_object_list rom_arg;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};

	rom_arg.count = 2;
	rom_arg.pointer = &rom_arg_elements[0];

	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	rom_arg_elements[0].integer.value = offset;

	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	rom_arg_elements[1].integer.value = len;

	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	if (ACPI_FAILURE(status)) {
		printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
		return -ENODEV;
	}
	obj = (union acpi_object *)buffer.pointer;
	len = min(len, (int)obj->buffer.length);
	memcpy(bios+offset, obj->buffer.pointer, len);
	kfree(buffer.pointer);
	return len;
}

bool nouveau_acpi_rom_supported(struct device *dev)
{
	acpi_status status;
	acpi_handle dhandle, rom_handle;

	dhandle = ACPI_HANDLE(dev);
	if (!dhandle)
		return false;

	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	if (ACPI_FAILURE(status))
		return false;

	nouveau_dsm_priv.rom_handle = rom_handle;
	return true;
}

int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
{
	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
}

void *
nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
{
	struct acpi_device *acpidev;
	acpi_handle handle;
	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;
	}

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

	ret = acpi_bus_get_device(handle, &acpidev);
	if (ret)
		return NULL;

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

	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
}
Commit	Line	Data
6ee73861 BS	1	#include <linux/pci.h>
6ee73861 BS	2	#include <linux/acpi.h>
5a0e3ad6	3	#include <linux/slab.h>
8116188f	4	#include <linux/mxm-wmi.h>
6a9ee8af	5	#include <linux/vga_switcheroo.h>
612a9aab	6	#include <drm/drm_edid.h>
8b48463f	7	#include <acpi/video.h>
c0077061	8
4dc28134	9	#include "nouveau_drv.h"
c0077061 BS	10	#include "nouveau_acpi.h"
c0077061 BS	11
6ee73861 BS	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
	17
	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
	22
5addcf0a DA	23	#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
	24	#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
	25
	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)
	29
	30	#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 \| NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
	31
	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)
	41
	42	#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
	43	#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
d099230c	44
6a9ee8af DA	45	static struct nouveau_dsm_priv {
6a9ee8af DA	46	bool dsm_detected;
f19467c5	47	bool optimus_detected;
cba97805	48	bool optimus_flags_detected;
692a17dc	49	bool optimus_skip_dsm;
6a9ee8af	50	acpi_handle dhandle;
afeb3e11	51	acpi_handle rom_handle;
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
6a9ee8af DA	63	static const char nouveau_dsm_muid[] = {
	64	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	65	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	66	};
6ee73861	67
f19467c5 DA	68	static const char nouveau_op_dsm_muid[] = {
	69	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	70	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	71	};
	72
	73	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	74	{
b072e53b	75	int i;
f19467c5	76	union acpi_object *obj;
d099230c	77	char args_buff[4];
b072e53b JL	78	union acpi_object argv4 = {
	79	.buffer.type = ACPI_TYPE_BUFFER,
	80	.buffer.length = 4,
	81	.buffer.pointer = args_buff
	82	};
f19467c5	83
d099230c PL	84	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	85	for (i = 0; i < 4; i++)
	86	args_buff[i] = (arg >> i * 8) & 0xFF;
f19467c5	87
b072e53b JL	88	*result = 0;
	89	obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
	90	func, &argv4, ACPI_TYPE_BUFFER);
	91	if (!obj) {
	92	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	93	return AE_ERROR;
	94	} else {
	95	if (obj->buffer.length == 4) {
f19467c5 DA	96	*result \|= obj->buffer.pointer[0];
	97	*result \|= (obj->buffer.pointer[1] << 8);
	98	*result \|= (obj->buffer.pointer[2] << 16);
	99	*result \|= (obj->buffer.pointer[3] << 24);
	100	}
b072e53b	101	ACPI_FREE(obj);
f19467c5 DA	102	}
f19467c5 DA	103
f19467c5 DA	104	return 0;
	105	}
	106
e284175a JL	107	/*
	108	* On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
	109	* requirements on the fourth parameter, so a private implementation
	110	* instead of using acpi_check_dsm().
	111	*/
a12e78dd	112	static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
e284175a JL	113	{
	114	int result;
	115
	116	/*
	117	* Function 0 returns a Buffer containing available functions.
	118	* The args parameter is ignored for function 0, so just put 0 in it
	119	*/
	120	if (nouveau_optimus_dsm(handle, 0, 0, &result))
	121	return 0;
	122
	123	/*
	124	* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
	125	* If the n-th bit is enabled, function n is supported
	126	*/
a12e78dd PW	127	if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
	128	return result;
	129	return 0;
e284175a JL	130	}
e284175a JL	131
b072e53b	132	static int nouveau_dsm(acpi_handle handle, int func, int arg)
6a9ee8af	133	{
b072e53b	134	int ret = 0;
6ee73861	135	union acpi_object *obj;
b072e53b JL	136	union acpi_object argv4 = {
	137	.integer.type = ACPI_TYPE_INTEGER,
	138	.integer.value = arg,
	139	};
	140
	141	obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
	142	func, &argv4, ACPI_TYPE_INTEGER);
	143	if (!obj) {
	144	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	145	return AE_ERROR;
	146	} else {
6ee73861	147	if (obj->integer.value == 0x80000002)
b072e53b JL	148	ret = -ENODEV;
b072e53b JL	149	ACPI_FREE(obj);
6ee73861 BS	150	}
6ee73861 BS	151
b072e53b	152	return ret;
9075e85f PL	153	}
9075e85f PL	154
6a9ee8af	155	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	156	{
000703f4	157	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	158	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
b072e53b	159	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
6a9ee8af DA	160	}
	161
	162	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	163	{
	164	int arg;
	165	if (state == VGA_SWITCHEROO_ON)
	166	arg = NOUVEAU_DSM_POWER_SPEED;
	167	else
	168	arg = NOUVEAU_DSM_POWER_STAMINA;
b072e53b	169	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
6a9ee8af DA	170	return 0;
	171	}
	172
	173	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	174	{
c839d748	175	if (!nouveau_dsm_priv.dsm_detected)
d099230c	176	return 0;
6a9ee8af	177	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	178	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	179	else
fc5ea29d	180	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	181	}
6ee73861	182
6a9ee8af DA	183	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	184	enum vga_switcheroo_state state)
	185	{
	186	if (id == VGA_SWITCHEROO_IGD)
	187	return 0;
	188
d099230c PL	189	/* Optimus laptops have the card already disabled in
d099230c PL	190	* nouveau_switcheroo_set_state */
c839d748	191	if (!nouveau_dsm_priv.dsm_detected)
d099230c PL	192	return 0;
d099230c PL	193
fc5ea29d	194	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	195	}
6a9ee8af DA	196
6a9ee8af	197	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	198	{
d1fbd923 DA	199	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	200	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	201	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	202
	203	/* is this device on Bus 0? - this may need improving */
	204	if (pdev->bus->number == 0)
	205	return VGA_SWITCHEROO_IGD;
	206
	207	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	208	}
6a9ee8af DA	209
5d170139	210	static const struct vga_switcheroo_handler nouveau_dsm_handler = {
6a9ee8af DA	211	.switchto = nouveau_dsm_switchto,
6a9ee8af DA	212	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	213	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	214	};
6ee73861	215
692a17dc PW	216	/*
	217	* Firmware supporting Windows 8 or later do not use _DSM to put the device into
	218	* D3cold, they instead rely on disabling power resources on the parent.
	219	*/
	220	static bool nouveau_pr3_present(struct pci_dev *pdev)
	221	{
	222	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
	223	struct acpi_device *parent_adev;
	224
	225	if (!parent_pdev)
	226	return false;
	227
	228	parent_adev = ACPI_COMPANION(&parent_pdev->dev);
	229	if (!parent_adev)
	230	return false;
	231
	232	return acpi_has_method(parent_adev->handle, "_PR3");
	233	}
	234
df42194a	235	static void nouveau_dsm_pci_probe(struct pci_dev pdev, acpi_handle dhandle_out,
cba97805	236	bool has_mux, bool has_opt,
692a17dc	237	bool has_opt_flags, bool has_pr3)
6a9ee8af	238	{
187b5b5d	239	acpi_handle dhandle;
df42194a	240	bool supports_mux;
a12e78dd	241	int optimus_funcs;
6a9ee8af	242
3a83f992	243	dhandle = ACPI_HANDLE(&pdev->dev);
6a9ee8af	244	if (!dhandle)
df42194a	245	return;
afeb3e11	246
f91ce35e	247	if (!acpi_has_method(dhandle, "_DSM"))
df42194a PW	248	return;
	249
	250	supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
	251	1 << NOUVEAU_DSM_POWER);
a12e78dd	252	optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
f91ce35e	253
df42194a	254	/* Does not look like a Nvidia device. */
a12e78dd	255	if (!supports_mux && !optimus_funcs)
df42194a	256	return;
f19467c5	257
df42194a PW	258	*dhandle_out = dhandle;
df42194a PW	259	*has_mux = supports_mux;
a12e78dd	260	*has_opt = !!optimus_funcs;
cba97805	261	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
692a17dc	262	*has_pr3 = false;
f19467c5	263
a12e78dd	264	if (optimus_funcs) {
5addcf0a DA	265	uint32_t result;
	266	nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
	267	&result);
	268	dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
	269	(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
	270	(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
	271	(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
692a17dc PW	272
692a17dc PW	273	*has_pr3 = nouveau_pr3_present(pdev);
5addcf0a	274	}
6ee73861	275	}
6a9ee8af DA	276
	277	static bool nouveau_dsm_detect(void)
	278	{
	279	char acpi_method_name[255] = { 0 };
	280	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	281	struct pci_dev *pdev = NULL;
df42194a PW	282	acpi_handle dhandle = NULL;
	283	bool has_mux = false;
	284	bool has_optimus = false;
cba97805	285	bool has_optimus_flags = false;
692a17dc	286	bool has_power_resources = false;
6a9ee8af	287	int vga_count = 0;
8116188f	288	bool guid_valid;
f19467c5	289	bool ret = false;
8116188f	290
f19467c5	291	/* lookup the MXM GUID */
8116188f	292	guid_valid = mxm_wmi_supported();
8116188f	293
f19467c5 DA	294	if (guid_valid)
f19467c5 DA	295	printk("MXM: GUID detected in BIOS\n");
afeb3e11	296
f19467c5	297	/* now do DSM detection */
6a9ee8af DA	298	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	299	vga_count++;
	300
cba97805	301	nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
692a17dc	302	&has_optimus_flags, &has_power_resources);
6a9ee8af DA	303	}
6a9ee8af DA	304
4c60fac1 EV	305	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	306	vga_count++;
	307
cba97805	308	nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
692a17dc	309	&has_optimus_flags, &has_power_resources);
4c60fac1 EV	310	}
4c60fac1 EV	311
c839d748	312	/* find the optimus DSM or the old v1 DSM */
df42194a PW	313	if (has_optimus) {
df42194a PW	314	nouveau_dsm_priv.dhandle = dhandle;
d099230c PL	315	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	316	&buffer);
c839d748	317	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
d099230c	318	acpi_method_name);
692a17dc PW	319	if (has_power_resources)
692a17dc PW	320	pr_info("nouveau: detected PR support, will not use DSM\n");
c839d748	321	nouveau_dsm_priv.optimus_detected = true;
cba97805	322	nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
692a17dc	323	nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
f19467c5	324	ret = true;
df42194a PW	325	} else if (vga_count == 2 && has_mux && guid_valid) {
df42194a PW	326	nouveau_dsm_priv.dhandle = dhandle;
d099230c PL	327	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	328	&buffer);
c839d748	329	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	330	acpi_method_name);
c839d748	331	nouveau_dsm_priv.dsm_detected = true;
d099230c PL	332	ret = true;
d099230c PL	333	}
f19467c5	334
c839d748	335
f19467c5	336	return ret;
6a9ee8af DA	337	}
	338
	339	void nouveau_register_dsm_handler(void)
	340	{
	341	bool r;
	342
	343	r = nouveau_dsm_detect();
	344	if (!r)
	345	return;
	346
156d7d41	347	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
6a9ee8af DA	348	}
6a9ee8af DA	349
d099230c PL	350	/* Must be called for Optimus models before the card can be turned off */
	351	void nouveau_switcheroo_optimus_dsm(void)
	352	{
	353	u32 result = 0;
692a17dc	354	if (!nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.optimus_skip_dsm)
d099230c PL	355	return;
d099230c PL	356
cba97805 PW	357	if (nouveau_dsm_priv.optimus_flags_detected)
	358	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
	359	0x3, &result);
5addcf0a DA	360
	361	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
	362	NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
	363
d099230c PL	364	}
d099230c PL	365
6a9ee8af DA	366	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	367	{
2f3787aa AH	368	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	369	vga_switcheroo_unregister_handler();
6a9ee8af	370	}
d0ce7b85 JM	371	#else
	372	void nouveau_register_dsm_handler(void) {}
	373	void nouveau_unregister_dsm_handler(void) {}
	374	void nouveau_switcheroo_optimus_dsm(void) {}
	375	#endif
afeb3e11 DA	376
	377	/* retrieve the ROM in 4k blocks */
	378	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	379	int offset, int len)
	380	{
	381	acpi_status status;
	382	union acpi_object rom_arg_elements[2], *obj;
	383	struct acpi_object_list rom_arg;
	384	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	385
	386	rom_arg.count = 2;
	387	rom_arg.pointer = &rom_arg_elements[0];
	388
	389	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	390	rom_arg_elements[0].integer.value = offset;
	391
	392	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	393	rom_arg_elements[1].integer.value = len;
	394
	395	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	396	if (ACPI_FAILURE(status)) {
	397	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	398	return -ENODEV;
	399	}
	400	obj = (union acpi_object *)buffer.pointer;
95432941	401	len = min(len, (int)obj->buffer.length);
afeb3e11 DA	402	memcpy(bios+offset, obj->buffer.pointer, len);
	403	kfree(buffer.pointer);
	404	return len;
	405	}
	406
26c9e8ef	407	bool nouveau_acpi_rom_supported(struct device *dev)
afeb3e11 DA	408	{
	409	acpi_status status;
	410	acpi_handle dhandle, rom_handle;
	411
26c9e8ef	412	dhandle = ACPI_HANDLE(dev);
afeb3e11 DA	413	if (!dhandle)
	414	return false;
	415
	416	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	417	if (ACPI_FAILURE(status))
	418	return false;
	419
	420	nouveau_dsm_priv.rom_handle = rom_handle;
	421	return true;
	422	}
	423
	424	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	425	{
	426	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	427	}
a6ed76d7	428
c0077061	429	void *
a6ed76d7 BS	430	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	431	{
a6ed76d7 BS	432	struct acpi_device *acpidev;
	433	acpi_handle handle;
	434	int type, ret;
	435	void *edid;
	436
	437	switch (connector->connector_type) {
	438	case DRM_MODE_CONNECTOR_LVDS:
	439	case DRM_MODE_CONNECTOR_eDP:
	440	type = ACPI_VIDEO_DISPLAY_LCD;
	441	break;
	442	default:
c0077061	443	return NULL;
a6ed76d7 BS	444	}
a6ed76d7 BS	445
3a83f992	446	handle = ACPI_HANDLE(&dev->pdev->dev);
a6ed76d7	447	if (!handle)
c0077061	448	return NULL;
a6ed76d7 BS	449
	450	ret = acpi_bus_get_device(handle, &acpidev);
	451	if (ret)
c0077061	452	return NULL;
a6ed76d7 BS	453
	454	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	455	if (ret < 0)
c0077061	456	return NULL;
a6ed76d7	457
c0077061	458	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	459	}