[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / nouveau / nouveau_acpi.c

#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <acpi/video.h>
#include <acpi/acpi.h>
#include <linux/mxm-wmi.h>

#include <linux/vga_switcheroo.h>

#include <drm/drm_edid.h>

#include "nouveau_drm.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;
	acpi_handle dhandle;
	acpi_handle other_handle;
	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;
}

#define NOUVEAU_DSM_HAS_MUX 0x1
#define NOUVEAU_DSM_HAS_OPT 0x2

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)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	int i, err;
	char args_buff[4];

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = 0x00000100;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_BUFFER;
	params[3].buffer.length = 4;
	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	for (i = 0; i < 4; i++)
		args_buff[i] = (arg >> i * 8) & 0xFF;
	params[3].buffer.pointer = args_buff;

	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	if (err) {
		printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
		return err;
	}

	obj = (union acpi_object *)output.pointer;

	if (obj->type == ACPI_TYPE_INTEGER)
		if (obj->integer.value == 0x80000002) {
			return -ENODEV;
		}

	if (obj->type == ACPI_TYPE_BUFFER) {
		if (obj->buffer.length == 4 && result) {
			*result = 0;
			*result |= obj->buffer.pointer[0];
			*result |= (obj->buffer.pointer[1] << 8);
			*result |= (obj->buffer.pointer[2] << 16);
			*result |= (obj->buffer.pointer[3] << 24);
		}
	}

	kfree(output.pointer);
	return 0;
}

static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	int err;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(nouveau_dsm_muid);
	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = 0x00000102;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_INTEGER;
	params[3].integer.value = arg;

	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	if (err) {
		printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
		return err;
	}

	obj = (union acpi_object *)output.pointer;

	if (obj->type == ACPI_TYPE_INTEGER)
		if (obj->integer.value == 0x80000002)
			return -ENODEV;

	if (obj->type == ACPI_TYPE_BUFFER) {
		if (obj->buffer.length == 4 && result) {
			*result = 0;
			*result |= obj->buffer.pointer[0];
			*result |= (obj->buffer.pointer[1] << 8);
			*result |= (obj->buffer.pointer[2] << 16);
			*result |= (obj->buffer.pointer[3] << 24);
		}
	}

	kfree(output.pointer);
	return 0;
}

/* Returns 1 if a DSM function is usable and 0 otherwise */
static int nouveau_test_dsm(acpi_handle test_handle,
	int (*dsm_func)(acpi_handle, int, int, uint32_t *),
	int sfnc)
{
	u32 result = 0;

	/* Function 0 returns a Buffer containing available functions. The args
	 * parameter is ignored for function 0, so just put 0 in it */
	if (dsm_func(test_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 */
	return result & 1 && result & (1 << sfnc);
}

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, NULL);
}

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, NULL);
	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 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 int nouveau_dsm_pci_probe(struct pci_dev *pdev)
{
	acpi_handle dhandle;
	int retval = 0;

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

	if (!acpi_has_method(dhandle, "_DSM")) {
		nouveau_dsm_priv.other_handle = dhandle;
		return false;
	}
	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
		retval |= NOUVEAU_DSM_HAS_MUX;

	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
		NOUVEAU_DSM_OPTIMUS_CAPS))
		retval |= NOUVEAU_DSM_HAS_OPT;

	if (retval & NOUVEAU_DSM_HAS_OPT) {
		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" : "");
	}
	if (retval)
		nouveau_dsm_priv.dhandle = dhandle;

	return retval;
}

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;
	int has_dsm = 0;
	int has_optimus = 0;
	int vga_count = 0;
	bool guid_valid;
	int retval;
	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++;

		retval = nouveau_dsm_pci_probe(pdev);
		if (retval & NOUVEAU_DSM_HAS_MUX)
			has_dsm |= 1;
		if (retval & NOUVEAU_DSM_HAS_OPT)
			has_optimus = 1;
	}

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

		retval = nouveau_dsm_pci_probe(pdev);
		if (retval & NOUVEAU_DSM_HAS_MUX)
			has_dsm |= 1;
		if (retval & NOUVEAU_DSM_HAS_OPT)
			has_optimus = 1;
	}

	/* find the optimus DSM or the old v1 DSM */
	if (has_optimus == 1) {
		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);
		nouveau_dsm_priv.optimus_detected = true;
		ret = true;
	} else if (vga_count == 2 && has_dsm && guid_valid) {
		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;
		/*
		 * On some systems hotplug events are generated for the device
		 * being switched off when _DSM is executed.  They cause ACPI
		 * hotplug to trigger and attempt to remove the device from
		 * the system, which causes it to break down.  Prevent that from
		 * happening by setting the no_hotplug flag for the involved
		 * ACPI device objects.
		 */
		acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
		acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
		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);
}

/* 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)
		return;

	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();
}

/* 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;
	memcpy(bios+offset, obj->buffer.pointer, len);
	kfree(buffer.pointer);
	return len;
}

bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
{
	acpi_status status;
	acpi_handle dhandle, rom_handle;

	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
		return false;

	dhandle = ACPI_HANDLE(&pdev->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>
6ee73861 BS	4	#include <acpi/acpi_drivers.h>
6ee73861 BS	5	#include <acpi/acpi_bus.h>
a6ed76d7	6	#include <acpi/video.h>
8116188f DA	7	#include <acpi/acpi.h>
8116188f DA	8	#include <linux/mxm-wmi.h>
6ee73861	9
6a9ee8af DA	10	#include <linux/vga_switcheroo.h>
6a9ee8af DA	11
612a9aab	12	#include <drm/drm_edid.h>
c0077061 BS	13
	14	#include "nouveau_drm.h"
	15	#include "nouveau_acpi.h"
	16
6ee73861 BS	17	#define NOUVEAU_DSM_LED 0x02
	18	#define NOUVEAU_DSM_LED_STATE 0x00
	19	#define NOUVEAU_DSM_LED_OFF 0x10
	20	#define NOUVEAU_DSM_LED_STAMINA 0x11
	21	#define NOUVEAU_DSM_LED_SPEED 0x12
	22
	23	#define NOUVEAU_DSM_POWER 0x03
	24	#define NOUVEAU_DSM_POWER_STATE 0x00
	25	#define NOUVEAU_DSM_POWER_SPEED 0x01
	26	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	27
5addcf0a DA	28	#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
	29	#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
	30
	31	#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
	32	#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
	33	#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
	34
	35	#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 \| NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
	36
	37	/* result of the optimus caps function */
	38	#define OPTIMUS_ENABLED (1 << 0)
	39	#define OPTIMUS_STATUS_MASK (3 << 3)
	40	#define OPTIMUS_STATUS_OFF (0 << 3)
	41	#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
	42	#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
	43	#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
	44	#define OPTIMUS_CAPS_MASK (7 << 24)
	45	#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
	46
	47	#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
	48	#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
d099230c	49
6a9ee8af DA	50	static struct nouveau_dsm_priv {
6a9ee8af DA	51	bool dsm_detected;
f19467c5	52	bool optimus_detected;
6a9ee8af	53	acpi_handle dhandle;
f244d8b6	54	acpi_handle other_handle;
afeb3e11	55	acpi_handle rom_handle;
6a9ee8af DA	56	} nouveau_dsm_priv;
6a9ee8af DA	57
c839d748 DA	58	bool nouveau_is_optimus(void) {
	59	return nouveau_dsm_priv.optimus_detected;
	60	}
	61
	62	bool nouveau_is_v1_dsm(void) {
	63	return nouveau_dsm_priv.dsm_detected;
	64	}
	65
f19467c5 DA	66	#define NOUVEAU_DSM_HAS_MUX 0x1
	67	#define NOUVEAU_DSM_HAS_OPT 0x2
	68
6a9ee8af DA	69	static const char nouveau_dsm_muid[] = {
	70	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	71	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	72	};
6ee73861	73
f19467c5 DA	74	static const char nouveau_op_dsm_muid[] = {
	75	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	76	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	77	};
	78
	79	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	80	{
	81	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	82	struct acpi_object_list input;
	83	union acpi_object params[4];
	84	union acpi_object *obj;
d099230c PL	85	int i, err;
d099230c PL	86	char args_buff[4];
f19467c5 DA	87
	88	input.count = 4;
	89	input.pointer = params;
	90	params[0].type = ACPI_TYPE_BUFFER;
	91	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	92	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	93	params[1].type = ACPI_TYPE_INTEGER;
	94	params[1].integer.value = 0x00000100;
	95	params[2].type = ACPI_TYPE_INTEGER;
	96	params[2].integer.value = func;
	97	params[3].type = ACPI_TYPE_BUFFER;
d099230c PL	98	params[3].buffer.length = 4;
	99	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	100	for (i = 0; i < 4; i++)
	101	args_buff[i] = (arg >> i * 8) & 0xFF;
	102	params[3].buffer.pointer = args_buff;
f19467c5 DA	103
	104	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	105	if (err) {
	106	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
	107	return err;
	108	}
	109
	110	obj = (union acpi_object *)output.pointer;
	111
	112	if (obj->type == ACPI_TYPE_INTEGER)
	113	if (obj->integer.value == 0x80000002) {
	114	return -ENODEV;
	115	}
	116
	117	if (obj->type == ACPI_TYPE_BUFFER) {
	118	if (obj->buffer.length == 4 && result) {
	119	*result = 0;
	120	*result \|= obj->buffer.pointer[0];
	121	*result \|= (obj->buffer.pointer[1] << 8);
	122	*result \|= (obj->buffer.pointer[2] << 16);
	123	*result \|= (obj->buffer.pointer[3] << 24);
	124	}
	125	}
	126
	127	kfree(output.pointer);
	128	return 0;
	129	}
	130
6e86e041	131	static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
6a9ee8af	132	{
6ee73861 BS	133	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	134	struct acpi_object_list input;
	135	union acpi_object params[4];
	136	union acpi_object *obj;
	137	int err;
	138
6ee73861 BS	139	input.count = 4;
	140	input.pointer = params;
	141	params[0].type = ACPI_TYPE_BUFFER;
6a9ee8af DA	142	params[0].buffer.length = sizeof(nouveau_dsm_muid);
6a9ee8af DA	143	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
6ee73861 BS	144	params[1].type = ACPI_TYPE_INTEGER;
	145	params[1].integer.value = 0x00000102;
	146	params[2].type = ACPI_TYPE_INTEGER;
	147	params[2].integer.value = func;
	148	params[3].type = ACPI_TYPE_INTEGER;
	149	params[3].integer.value = arg;
	150
	151	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	152	if (err) {
6a9ee8af	153	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
6ee73861 BS	154	return err;
	155	}
	156
	157	obj = (union acpi_object *)output.pointer;
	158
	159	if (obj->type == ACPI_TYPE_INTEGER)
	160	if (obj->integer.value == 0x80000002)
	161	return -ENODEV;
	162
	163	if (obj->type == ACPI_TYPE_BUFFER) {
	164	if (obj->buffer.length == 4 && result) {
	165	*result = 0;
	166	*result \|= obj->buffer.pointer[0];
	167	*result \|= (obj->buffer.pointer[1] << 8);
	168	*result \|= (obj->buffer.pointer[2] << 16);
	169	*result \|= (obj->buffer.pointer[3] << 24);
	170	}
	171	}
	172
	173	kfree(output.pointer);
	174	return 0;
	175	}
	176
9075e85f PL	177	/* Returns 1 if a DSM function is usable and 0 otherwise */
	178	static int nouveau_test_dsm(acpi_handle test_handle,
	179	int (dsm_func)(acpi_handle, int, int, uint32_t ),
	180	int sfnc)
	181	{
	182	u32 result = 0;
	183
	184	/* Function 0 returns a Buffer containing available functions. The args
	185	* parameter is ignored for function 0, so just put 0 in it */
	186	if (dsm_func(test_handle, 0, 0, &result))
	187	return 0;
	188
	189	/* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
	190	* the n-th bit is enabled, function n is supported */
	191	return result & 1 && result & (1 << sfnc);
	192	}
	193
6a9ee8af	194	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	195	{
000703f4	196	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	197	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
6a9ee8af DA	198	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
	199	}
	200
	201	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	202	{
	203	int arg;
	204	if (state == VGA_SWITCHEROO_ON)
	205	arg = NOUVEAU_DSM_POWER_SPEED;
	206	else
	207	arg = NOUVEAU_DSM_POWER_STAMINA;
	208	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
	209	return 0;
	210	}
	211
	212	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	213	{
c839d748	214	if (!nouveau_dsm_priv.dsm_detected)
d099230c	215	return 0;
6a9ee8af	216	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	217	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	218	else
fc5ea29d	219	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	220	}
6ee73861	221
6a9ee8af DA	222	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	223	enum vga_switcheroo_state state)
	224	{
	225	if (id == VGA_SWITCHEROO_IGD)
	226	return 0;
	227
d099230c PL	228	/* Optimus laptops have the card already disabled in
d099230c PL	229	* nouveau_switcheroo_set_state */
c839d748	230	if (!nouveau_dsm_priv.dsm_detected)
d099230c PL	231	return 0;
d099230c PL	232
fc5ea29d	233	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	234	}
6a9ee8af DA	235
6a9ee8af	236	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	237	{
d1fbd923 DA	238	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	239	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	240	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	241
	242	/* is this device on Bus 0? - this may need improving */
	243	if (pdev->bus->number == 0)
	244	return VGA_SWITCHEROO_IGD;
	245
	246	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	247	}
	248
	249	static struct vga_switcheroo_handler nouveau_dsm_handler = {
	250	.switchto = nouveau_dsm_switchto,
	251	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	252	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	253	};
6ee73861	254
f19467c5	255	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af	256	{
187b5b5d	257	acpi_handle dhandle;
9075e85f	258	int retval = 0;
6a9ee8af	259
3a83f992	260	dhandle = ACPI_HANDLE(&pdev->dev);
6a9ee8af DA	261	if (!dhandle)
6a9ee8af DA	262	return false;
afeb3e11	263
f244d8b6 RW	264	if (!acpi_has_method(dhandle, "_DSM")) {
f244d8b6 RW	265	nouveau_dsm_priv.other_handle = dhandle;
6ee73861	266	return false;
f244d8b6	267	}
9075e85f	268	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
f19467c5 DA	269	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	270
9075e85f	271	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
5addcf0a	272	NOUVEAU_DSM_OPTIMUS_CAPS))
f19467c5 DA	273	retval \|= NOUVEAU_DSM_HAS_OPT;
f19467c5 DA	274
5addcf0a DA	275	if (retval & NOUVEAU_DSM_HAS_OPT) {
	276	uint32_t result;
	277	nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
	278	&result);
	279	dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
	280	(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
	281	(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
	282	(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
	283	}
f19467c5 DA	284	if (retval)
f19467c5 DA	285	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	286
f19467c5	287	return retval;
6ee73861	288	}
6a9ee8af DA	289
	290	static bool nouveau_dsm_detect(void)
	291	{
	292	char acpi_method_name[255] = { 0 };
	293	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	294	struct pci_dev *pdev = NULL;
	295	int has_dsm = 0;
addde4ec	296	int has_optimus = 0;
6a9ee8af	297	int vga_count = 0;
8116188f	298	bool guid_valid;
f19467c5 DA	299	int retval;
f19467c5 DA	300	bool ret = false;
8116188f	301
f19467c5	302	/* lookup the MXM GUID */
8116188f	303	guid_valid = mxm_wmi_supported();
8116188f	304
f19467c5 DA	305	if (guid_valid)
f19467c5 DA	306	printk("MXM: GUID detected in BIOS\n");
afeb3e11	307
f19467c5	308	/* now do DSM detection */
6a9ee8af DA	309	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	310	vga_count++;
	311
f19467c5	312	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	313	if (retval & NOUVEAU_DSM_HAS_MUX)
	314	has_dsm \|= 1;
	315	if (retval & NOUVEAU_DSM_HAS_OPT)
	316	has_optimus = 1;
6a9ee8af DA	317	}
6a9ee8af DA	318
4c60fac1 EV	319	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	320	vga_count++;
	321
	322	retval = nouveau_dsm_pci_probe(pdev);
	323	if (retval & NOUVEAU_DSM_HAS_MUX)
	324	has_dsm \|= 1;
	325	if (retval & NOUVEAU_DSM_HAS_OPT)
	326	has_optimus = 1;
	327	}
	328
c839d748 DA	329	/* find the optimus DSM or the old v1 DSM */
c839d748 DA	330	if (has_optimus == 1) {
d099230c PL	331	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	332	&buffer);
c839d748	333	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
d099230c	334	acpi_method_name);
c839d748	335	nouveau_dsm_priv.optimus_detected = true;
f19467c5	336	ret = true;
c839d748	337	} else if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	338	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	339	&buffer);
c839d748	340	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	341	acpi_method_name);
c839d748	342	nouveau_dsm_priv.dsm_detected = true;
f244d8b6 RW	343	/*
	344	* On some systems hotplug events are generated for the device
	345	* being switched off when _DSM is executed. They cause ACPI
	346	* hotplug to trigger and attempt to remove the device from
	347	* the system, which causes it to break down. Prevent that from
	348	* happening by setting the no_hotplug flag for the involved
	349	* ACPI device objects.
	350	*/
	351	acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
	352	acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
d099230c PL	353	ret = true;
d099230c PL	354	}
f19467c5	355
c839d748	356
f19467c5	357	return ret;
6a9ee8af DA	358	}
	359
	360	void nouveau_register_dsm_handler(void)
	361	{
	362	bool r;
	363
	364	r = nouveau_dsm_detect();
	365	if (!r)
	366	return;
	367
	368	vga_switcheroo_register_handler(&nouveau_dsm_handler);
	369	}
	370
d099230c PL	371	/* Must be called for Optimus models before the card can be turned off */
	372	void nouveau_switcheroo_optimus_dsm(void)
	373	{
	374	u32 result = 0;
	375	if (!nouveau_dsm_priv.optimus_detected)
	376	return;
	377
5addcf0a DA	378	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
	379	0x3, &result);
	380
	381	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
	382	NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
	383
d099230c PL	384	}
d099230c PL	385
6a9ee8af DA	386	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	387	{
2f3787aa AH	388	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	389	vga_switcheroo_unregister_handler();
6a9ee8af	390	}
afeb3e11 DA	391
	392	/* retrieve the ROM in 4k blocks */
	393	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	394	int offset, int len)
	395	{
	396	acpi_status status;
	397	union acpi_object rom_arg_elements[2], *obj;
	398	struct acpi_object_list rom_arg;
	399	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	400
	401	rom_arg.count = 2;
	402	rom_arg.pointer = &rom_arg_elements[0];
	403
	404	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	405	rom_arg_elements[0].integer.value = offset;
	406
	407	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	408	rom_arg_elements[1].integer.value = len;
	409
	410	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	411	if (ACPI_FAILURE(status)) {
	412	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	413	return -ENODEV;
	414	}
	415	obj = (union acpi_object *)buffer.pointer;
	416	memcpy(bios+offset, obj->buffer.pointer, len);
	417	kfree(buffer.pointer);
	418	return len;
	419	}
	420
	421	bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
	422	{
	423	acpi_status status;
	424	acpi_handle dhandle, rom_handle;
	425
f19467c5	426	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
afeb3e11 DA	427	return false;
afeb3e11 DA	428
3a83f992	429	dhandle = ACPI_HANDLE(&pdev->dev);
afeb3e11 DA	430	if (!dhandle)
	431	return false;
	432
	433	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	434	if (ACPI_FAILURE(status))
	435	return false;
	436
	437	nouveau_dsm_priv.rom_handle = rom_handle;
	438	return true;
	439	}
	440
	441	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	442	{
	443	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	444	}
a6ed76d7	445
c0077061	446	void *
a6ed76d7 BS	447	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	448	{
a6ed76d7 BS	449	struct acpi_device *acpidev;
	450	acpi_handle handle;
	451	int type, ret;
	452	void *edid;
	453
	454	switch (connector->connector_type) {
	455	case DRM_MODE_CONNECTOR_LVDS:
	456	case DRM_MODE_CONNECTOR_eDP:
	457	type = ACPI_VIDEO_DISPLAY_LCD;
	458	break;
	459	default:
c0077061	460	return NULL;
a6ed76d7 BS	461	}
a6ed76d7 BS	462
3a83f992	463	handle = ACPI_HANDLE(&dev->pdev->dev);
a6ed76d7	464	if (!handle)
c0077061	465	return NULL;
a6ed76d7 BS	466
	467	ret = acpi_bus_get_device(handle, &acpidev);
	468	if (ret)
c0077061	469	return NULL;
a6ed76d7 BS	470
	471	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	472	if (ret < 0)
c0077061	473	return NULL;
a6ed76d7	474
c0077061	475	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	476	}