[mirror_ubuntu-artful-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 <drm/drmP.h>
#include "i915_drv.h"

#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
#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 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)
{
	int i;
	union acpi_object *pkg, *connector_count;

	pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid,
			INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
			NULL, ACPI_TYPE_PACKAGE);
	if (!pkg) {
		DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
		return;
	}

	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]));
	}

	ACPI_FREE(pkg);
}

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

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

	if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID,
			    1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
		DRM_DEBUG_KMS("no _DSM method for intel device\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>
760285e7	8	#include <drm/drmP.h>
c43b5634	9	#include "i915_drv.h"
723bfd70 JB	10
723bfd70 JB	11	#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
723bfd70 JB	12	#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
	13
	14	static struct intel_dsm_priv {
	15	acpi_handle dhandle;
	16	} intel_dsm_priv;
	17
	18	static const u8 intel_dsm_guid[] = {
	19	0xd3, 0x73, 0xd8, 0x7e,
	20	0xd0, 0xc2,
	21	0x4f, 0x4e,
	22	0xa8, 0x54,
	23	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
	24	};
	25
723bfd70 JB	26	static char *intel_dsm_port_name(u8 id)
	27	{
	28	switch (id) {
	29	case 0:
	30	return "Reserved";
	31	case 1:
	32	return "Analog VGA";
	33	case 2:
	34	return "LVDS";
	35	case 3:
	36	return "Reserved";
	37	case 4:
	38	return "HDMI/DVI_B";
	39	case 5:
	40	return "HDMI/DVI_C";
	41	case 6:
	42	return "HDMI/DVI_D";
	43	case 7:
	44	return "DisplayPort_A";
	45	case 8:
	46	return "DisplayPort_B";
	47	case 9:
	48	return "DisplayPort_C";
	49	case 0xa:
	50	return "DisplayPort_D";
	51	case 0xb:
	52	case 0xc:
	53	case 0xd:
	54	return "Reserved";
	55	case 0xe:
	56	return "WiDi";
	57	default:
	58	return "bad type";
	59	}
	60	}
	61
	62	static char *intel_dsm_mux_type(u8 type)
	63	{
	64	switch (type) {
	65	case 0:
	66	return "unknown";
	67	case 1:
	68	return "No MUX, iGPU only";
	69	case 2:
	70	return "No MUX, dGPU only";
	71	case 3:
	72	return "MUXed between iGPU and dGPU";
	73	default:
	74	return "bad type";
	75	}
	76	}
	77
	78	static void intel_dsm_platform_mux_info(void)
	79	{
d5c3d79e JL	80	int i;
	81	union acpi_object pkg, connector_count;
	82
	83	pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid,
	84	INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
	85	NULL, ACPI_TYPE_PACKAGE);
	86	if (!pkg) {
	87	DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
	88	return;
723bfd70 JB	89	}
723bfd70 JB	90
d5c3d79e JL	91	connector_count = &pkg->package.elements[0];
	92	DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
	93	(unsigned long long)connector_count->integer.value);
	94	for (i = 1; i < pkg->package.count; i++) {
	95	union acpi_object *obj = &pkg->package.elements[i];
	96	union acpi_object *connector_id = &obj->package.elements[0];
	97	union acpi_object *info = &obj->package.elements[1];
	98	DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
	99	(unsigned long long)connector_id->integer.value);
	100	DRM_DEBUG_DRIVER(" port id: %s\n",
	101	intel_dsm_port_name(info->buffer.pointer[0]));
	102	DRM_DEBUG_DRIVER(" display mux info: %s\n",
	103	intel_dsm_mux_type(info->buffer.pointer[1]));
	104	DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
	105	intel_dsm_mux_type(info->buffer.pointer[2]));
	106	DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
	107	intel_dsm_mux_type(info->buffer.pointer[3]));
723bfd70 JB	108	}
723bfd70 JB	109
d5c3d79e	110	ACPI_FREE(pkg);
723bfd70 JB	111	}
723bfd70 JB	112
723bfd70 JB	113	static bool intel_dsm_pci_probe(struct pci_dev *pdev)
723bfd70 JB	114	{
2a3ca142	115	acpi_handle dhandle;
723bfd70	116
3a83f992	117	dhandle = ACPI_HANDLE(&pdev->dev);
723bfd70 JB	118	if (!dhandle)
	119	return false;
	120
d5c3d79e JL	121	if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID,
d5c3d79e JL	122	1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
723bfd70 JB	123	DRM_DEBUG_KMS("no _DSM method for intel device\n");
	124	return false;
	125	}
	126
723bfd70	127	intel_dsm_priv.dhandle = dhandle;
723bfd70	128	intel_dsm_platform_mux_info();
d5c3d79e	129
723bfd70 JB	130	return true;
	131	}
	132
	133	static bool intel_dsm_detect(void)
	134	{
	135	char acpi_method_name[255] = { 0 };
	136	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	137	struct pci_dev *pdev = NULL;
	138	bool has_dsm = false;
	139	int vga_count = 0;
	140
	141	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	142	vga_count++;
	143	has_dsm \|= intel_dsm_pci_probe(pdev);
	144	}
	145
	146	if (vga_count == 2 && has_dsm) {
	147	acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
5389e916	148	DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
723bfd70 JB	149	acpi_method_name);
	150	return true;
	151	}
	152
	153	return false;
	154	}
	155
	156	void intel_register_dsm_handler(void)
	157	{
	158	if (!intel_dsm_detect())
	159	return;
723bfd70 JB	160	}
	161
	162	void intel_unregister_dsm_handler(void)
	163	{
723bfd70	164	}