[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / intel_acpi.c

/*
 * Intel ACPI functions
 *
 * _DSM related code stolen from nouveau_acpi.c.
 */
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/vga_switcheroo.h>
#include <drm/drmP.h>
#include "i915_drv.h"

#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */

#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */

static struct intel_dsm_priv {
	acpi_handle dhandle;
} intel_dsm_priv;

static const u8 intel_dsm_guid[] = {
	0xd3, 0x73, 0xd8, 0x7e,
	0xd0, 0xc2,
	0x4f, 0x4e,
	0xa8, 0x54,
	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
};

static int intel_dsm(acpi_handle handle, int func)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	u32 result;
	int ret = 0;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(intel_dsm_guid);
	params[0].buffer.pointer = (char *)intel_dsm_guid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = INTEL_DSM_REVISION_ID;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

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

	obj = (union acpi_object *)output.pointer;

	result = 0;
	switch (obj->type) {
	case ACPI_TYPE_INTEGER:
		result = obj->integer.value;
		break;

	case ACPI_TYPE_BUFFER:
		if (obj->buffer.length == 4) {
			result = (obj->buffer.pointer[0] |
				(obj->buffer.pointer[1] <<  8) |
				(obj->buffer.pointer[2] << 16) |
				(obj->buffer.pointer[3] << 24));
			break;
		}
	default:
		ret = -EINVAL;
		break;
	}
	if (result == 0x80000002)
		ret = -ENODEV;

	kfree(output.pointer);
	return ret;
}

static char *intel_dsm_port_name(u8 id)
{
	switch (id) {
	case 0:
		return "Reserved";
	case 1:
		return "Analog VGA";
	case 2:
		return "LVDS";
	case 3:
		return "Reserved";
	case 4:
		return "HDMI/DVI_B";
	case 5:
		return "HDMI/DVI_C";
	case 6:
		return "HDMI/DVI_D";
	case 7:
		return "DisplayPort_A";
	case 8:
		return "DisplayPort_B";
	case 9:
		return "DisplayPort_C";
	case 0xa:
		return "DisplayPort_D";
	case 0xb:
	case 0xc:
	case 0xd:
		return "Reserved";
	case 0xe:
		return "WiDi";
	default:
		return "bad type";
	}
}

static char *intel_dsm_mux_type(u8 type)
{
	switch (type) {
	case 0:
		return "unknown";
	case 1:
		return "No MUX, iGPU only";
	case 2:
		return "No MUX, dGPU only";
	case 3:
		return "MUXed between iGPU and dGPU";
	default:
		return "bad type";
	}
}

static void intel_dsm_platform_mux_info(void)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *pkg;
	int i, ret;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(intel_dsm_guid);
	params[0].buffer.pointer = (char *)intel_dsm_guid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = INTEL_DSM_REVISION_ID;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

	ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
				   &output);
	if (ret) {
		DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
		goto out;
	}

	pkg = (union acpi_object *)output.pointer;

	if (pkg->type == ACPI_TYPE_PACKAGE) {
		union acpi_object *connector_count = &pkg->package.elements[0];
		DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
			  (unsigned long long)connector_count->integer.value);
		for (i = 1; i < pkg->package.count; i++) {
			union acpi_object *obj = &pkg->package.elements[i];
			union acpi_object *connector_id =
				&obj->package.elements[0];
			union acpi_object *info = &obj->package.elements[1];
			DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
				  (unsigned long long)connector_id->integer.value);
			DRM_DEBUG_DRIVER("  port id: %s\n",
			       intel_dsm_port_name(info->buffer.pointer[0]));
			DRM_DEBUG_DRIVER("  display mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[1]));
			DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[2]));
			DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[3]));
		}
	}

out:
	kfree(output.pointer);
}

static bool intel_dsm_pci_probe(struct pci_dev *pdev)
{
	acpi_handle dhandle;
	int ret;

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

	if (!acpi_has_method(dhandle, "_DSM")) {
		DRM_DEBUG_KMS("no _DSM method for intel device\n");
		return false;
	}

	ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS);
	if (ret < 0) {
		DRM_DEBUG_KMS("failed to get supported _DSM functions\n");
		return false;
	}

	intel_dsm_priv.dhandle = dhandle;

	intel_dsm_platform_mux_info();
	return true;
}

static bool intel_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;
	bool has_dsm = false;
	int vga_count = 0;

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
		vga_count++;
		has_dsm |= intel_dsm_pci_probe(pdev);
	}

	if (vga_count == 2 && has_dsm) {
		acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
		DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
				 acpi_method_name);
		return true;
	}

	return false;
}

void intel_register_dsm_handler(void)
{
	if (!intel_dsm_detect())
		return;
}

void intel_unregister_dsm_handler(void)
{
}
Commit	Line	Data
723bfd70 JB	1	/*
	2	* Intel ACPI functions
	3	*
	4	* _DSM related code stolen from nouveau_acpi.c.
	5	*/
	6	#include <linux/pci.h>
	7	#include <linux/acpi.h>
	8	#include <linux/vga_switcheroo.h>
760285e7	9	#include <drm/drmP.h>
c43b5634	10	#include "i915_drv.h"
723bfd70 JB	11
	12	#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
	13
	14	#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
	15	#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
	16
	17	static struct intel_dsm_priv {
	18	acpi_handle dhandle;
	19	} intel_dsm_priv;
	20
	21	static const u8 intel_dsm_guid[] = {
	22	0xd3, 0x73, 0xd8, 0x7e,
	23	0xd0, 0xc2,
	24	0x4f, 0x4e,
	25	0xa8, 0x54,
	26	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
	27	};
	28
6d5c2d8c	29	static int intel_dsm(acpi_handle handle, int func)
723bfd70 JB	30	{
	31	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	32	struct acpi_object_list input;
	33	union acpi_object params[4];
	34	union acpi_object *obj;
	35	u32 result;
	36	int ret = 0;
	37
	38	input.count = 4;
	39	input.pointer = params;
	40	params[0].type = ACPI_TYPE_BUFFER;
	41	params[0].buffer.length = sizeof(intel_dsm_guid);
	42	params[0].buffer.pointer = (char *)intel_dsm_guid;
	43	params[1].type = ACPI_TYPE_INTEGER;
	44	params[1].integer.value = INTEL_DSM_REVISION_ID;
	45	params[2].type = ACPI_TYPE_INTEGER;
	46	params[2].integer.value = func;
6d5c2d8c PW	47	params[3].type = ACPI_TYPE_PACKAGE;
	48	params[3].package.count = 0;
	49	params[3].package.elements = NULL;
723bfd70 JB	50
	51	ret = acpi_evaluate_object(handle, "_DSM", &input, &output);
	52	if (ret) {
	53	DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
	54	return ret;
	55	}
	56
	57	obj = (union acpi_object *)output.pointer;
	58
	59	result = 0;
	60	switch (obj->type) {
	61	case ACPI_TYPE_INTEGER:
	62	result = obj->integer.value;
	63	break;
	64
	65	case ACPI_TYPE_BUFFER:
	66	if (obj->buffer.length == 4) {
0206e353	67	result = (obj->buffer.pointer[0] \|
723bfd70 JB	68	(obj->buffer.pointer[1] << 8) \|
	69	(obj->buffer.pointer[2] << 16) \|
	70	(obj->buffer.pointer[3] << 24));
	71	break;
	72	}
	73	default:
	74	ret = -EINVAL;
	75	break;
	76	}
	77	if (result == 0x80000002)
	78	ret = -ENODEV;
	79
	80	kfree(output.pointer);
	81	return ret;
	82	}
	83
	84	static char *intel_dsm_port_name(u8 id)
	85	{
	86	switch (id) {
	87	case 0:
	88	return "Reserved";
	89	case 1:
	90	return "Analog VGA";
	91	case 2:
	92	return "LVDS";
	93	case 3:
	94	return "Reserved";
	95	case 4:
	96	return "HDMI/DVI_B";
	97	case 5:
	98	return "HDMI/DVI_C";
	99	case 6:
	100	return "HDMI/DVI_D";
	101	case 7:
	102	return "DisplayPort_A";
	103	case 8:
	104	return "DisplayPort_B";
	105	case 9:
	106	return "DisplayPort_C";
	107	case 0xa:
	108	return "DisplayPort_D";
	109	case 0xb:
	110	case 0xc:
	111	case 0xd:
	112	return "Reserved";
	113	case 0xe:
	114	return "WiDi";
	115	default:
	116	return "bad type";
	117	}
	118	}
	119
	120	static char *intel_dsm_mux_type(u8 type)
	121	{
	122	switch (type) {
	123	case 0:
	124	return "unknown";
	125	case 1:
	126	return "No MUX, iGPU only";
	127	case 2:
	128	return "No MUX, dGPU only";
	129	case 3:
	130	return "MUXed between iGPU and dGPU";
	131	default:
132	return "bad type";
133	}
134	}
135
136	static void intel_dsm_platform_mux_info(void)
137	{
138	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
139	struct acpi_object_list input;
140	union acpi_object params[4];
141	union acpi_object *pkg;
142	int i, ret;
143
144	input.count = 4;
145	input.pointer = params;
146	params[0].type = ACPI_TYPE_BUFFER;
147	params[0].buffer.length = sizeof(intel_dsm_guid);
148	params[0].buffer.pointer = (char *)intel_dsm_guid;
149	params[1].type = ACPI_TYPE_INTEGER;
150	params[1].integer.value = INTEL_DSM_REVISION_ID;
151	params[2].type = ACPI_TYPE_INTEGER;
152	params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
6d5c2d8c PW	153	params[3].type = ACPI_TYPE_PACKAGE;
	154	params[3].package.count = 0;
	155	params[3].package.elements = NULL;
723bfd70 JB	156
	157	ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
	158	&output);
	159	if (ret) {
	160	DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
	161	goto out;
	162	}
	163
	164	pkg = (union acpi_object *)output.pointer;
	165
	166	if (pkg->type == ACPI_TYPE_PACKAGE) {
	167	union acpi_object *connector_count = &pkg->package.elements[0];
	168	DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
	169	(unsigned long long)connector_count->integer.value);
	170	for (i = 1; i < pkg->package.count; i++) {
	171	union acpi_object *obj = &pkg->package.elements[i];
	172	union acpi_object *connector_id =
	173	&obj->package.elements[0];
	174	union acpi_object *info = &obj->package.elements[1];
	175	DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
	176	(unsigned long long)connector_id->integer.value);
	177	DRM_DEBUG_DRIVER(" port id: %s\n",
	178	intel_dsm_port_name(info->buffer.pointer[0]));
	179	DRM_DEBUG_DRIVER(" display mux info: %s\n",
	180	intel_dsm_mux_type(info->buffer.pointer[1]));
	181	DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
	182	intel_dsm_mux_type(info->buffer.pointer[2]));
	183	DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
	184	intel_dsm_mux_type(info->buffer.pointer[3]));
	185	}
723bfd70 JB	186	}
	187
	188	out:
	189	kfree(output.pointer);
	190	}
	191
723bfd70 JB	192	static bool intel_dsm_pci_probe(struct pci_dev *pdev)
723bfd70 JB	193	{
2a3ca142	194	acpi_handle dhandle;
723bfd70 JB	195	int ret;
723bfd70 JB	196
3a83f992	197	dhandle = ACPI_HANDLE(&pdev->dev);
723bfd70 JB	198	if (!dhandle)
	199	return false;
	200
2a3ca142	201	if (!acpi_has_method(dhandle, "_DSM")) {
723bfd70 JB	202	DRM_DEBUG_KMS("no _DSM method for intel device\n");
	203	return false;
	204	}
	205
6d5c2d8c	206	ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS);
723bfd70	207	if (ret < 0) {
0b8ecdda	208	DRM_DEBUG_KMS("failed to get supported _DSM functions\n");
723bfd70 JB	209	return false;
	210	}
	211
	212	intel_dsm_priv.dhandle = dhandle;
	213
	214	intel_dsm_platform_mux_info();
	215	return true;
	216	}
	217
	218	static bool intel_dsm_detect(void)
	219	{
	220	char acpi_method_name[255] = { 0 };
	221	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	222	struct pci_dev *pdev = NULL;
	223	bool has_dsm = false;
	224	int vga_count = 0;
	225
	226	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	227	vga_count++;
	228	has_dsm \|= intel_dsm_pci_probe(pdev);
	229	}
	230
	231	if (vga_count == 2 && has_dsm) {
	232	acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
	233	DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
	234	acpi_method_name);
	235	return true;
	236	}
	237
	238	return false;
	239	}
	240
	241	void intel_register_dsm_handler(void)
	242	{
	243	if (!intel_dsm_detect())
	244	return;
723bfd70 JB	245	}
	246
	247	void intel_unregister_dsm_handler(void)
	248	{
723bfd70	249	}