[deliverable/linux.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_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>
	8	#include <linux/vga_switcheroo.h>
760285e7	9	#include <drm/drmP.h>
c43b5634	10	#include "i915_drv.h"
723bfd70 JB	11
723bfd70 JB	12	#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
723bfd70 JB	13	#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
	14
	15	static struct intel_dsm_priv {
	16	acpi_handle dhandle;
	17	} intel_dsm_priv;
	18
	19	static const u8 intel_dsm_guid[] = {
	20	0xd3, 0x73, 0xd8, 0x7e,
	21	0xd0, 0xc2,
	22	0x4f, 0x4e,
	23	0xa8, 0x54,
	24	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
	25	};
	26
723bfd70 JB	27	static char *intel_dsm_port_name(u8 id)
	28	{
	29	switch (id) {
	30	case 0:
	31	return "Reserved";
	32	case 1:
	33	return "Analog VGA";
	34	case 2:
	35	return "LVDS";
	36	case 3:
	37	return "Reserved";
	38	case 4:
	39	return "HDMI/DVI_B";
	40	case 5:
	41	return "HDMI/DVI_C";
	42	case 6:
	43	return "HDMI/DVI_D";
	44	case 7:
	45	return "DisplayPort_A";
	46	case 8:
	47	return "DisplayPort_B";
	48	case 9:
	49	return "DisplayPort_C";
	50	case 0xa:
	51	return "DisplayPort_D";
	52	case 0xb:
	53	case 0xc:
	54	case 0xd:
	55	return "Reserved";
	56	case 0xe:
	57	return "WiDi";
	58	default:
	59	return "bad type";
	60	}
	61	}
	62
	63	static char *intel_dsm_mux_type(u8 type)
	64	{
	65	switch (type) {
	66	case 0:
	67	return "unknown";
	68	case 1:
	69	return "No MUX, iGPU only";
	70	case 2:
	71	return "No MUX, dGPU only";
	72	case 3:
	73	return "MUXed between iGPU and dGPU";
	74	default:
	75	return "bad type";
	76	}
	77	}
	78
	79	static void intel_dsm_platform_mux_info(void)
	80	{
d5c3d79e JL	81	int i;
	82	union acpi_object pkg, connector_count;
	83
	84	pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid,
	85	INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
	86	NULL, ACPI_TYPE_PACKAGE);
	87	if (!pkg) {
	88	DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
	89	return;
723bfd70 JB	90	}
723bfd70 JB	91
d5c3d79e JL	92	connector_count = &pkg->package.elements[0];
	93	DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
	94	(unsigned long long)connector_count->integer.value);
	95	for (i = 1; i < pkg->package.count; i++) {
	96	union acpi_object *obj = &pkg->package.elements[i];
	97	union acpi_object *connector_id = &obj->package.elements[0];
	98	union acpi_object *info = &obj->package.elements[1];
	99	DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
	100	(unsigned long long)connector_id->integer.value);
	101	DRM_DEBUG_DRIVER(" port id: %s\n",
	102	intel_dsm_port_name(info->buffer.pointer[0]));
	103	DRM_DEBUG_DRIVER(" display mux info: %s\n",
	104	intel_dsm_mux_type(info->buffer.pointer[1]));
	105	DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
	106	intel_dsm_mux_type(info->buffer.pointer[2]));
	107	DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
	108	intel_dsm_mux_type(info->buffer.pointer[3]));
723bfd70 JB	109	}
723bfd70 JB	110
d5c3d79e	111	ACPI_FREE(pkg);
723bfd70 JB	112	}
723bfd70 JB	113
723bfd70 JB	114	static bool intel_dsm_pci_probe(struct pci_dev *pdev)
723bfd70 JB	115	{
2a3ca142	116	acpi_handle dhandle;
723bfd70	117
3a83f992	118	dhandle = ACPI_HANDLE(&pdev->dev);
723bfd70 JB	119	if (!dhandle)
	120	return false;
	121
d5c3d79e JL	122	if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID,
d5c3d79e JL	123	1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
723bfd70 JB	124	DRM_DEBUG_KMS("no _DSM method for intel device\n");
	125	return false;
	126	}
	127
723bfd70	128	intel_dsm_priv.dhandle = dhandle;
723bfd70	129	intel_dsm_platform_mux_info();
d5c3d79e	130
723bfd70 JB	131	return true;
	132	}
	133
	134	static bool intel_dsm_detect(void)
	135	{
	136	char acpi_method_name[255] = { 0 };
	137	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	138	struct pci_dev *pdev = NULL;
	139	bool has_dsm = false;
	140	int vga_count = 0;
	141
	142	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	143	vga_count++;
	144	has_dsm \|= intel_dsm_pci_probe(pdev);
	145	}
	146
	147	if (vga_count == 2 && has_dsm) {
	148	acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
	149	DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
	150	acpi_method_name);
	151	return true;
	152	}
	153
	154	return false;
	155	}
	156
	157	void intel_register_dsm_handler(void)
	158	{
	159	if (!intel_dsm_detect())
	160	return;
723bfd70 JB	161	}
	162
	163	void intel_unregister_dsm_handler(void)
	164	{
723bfd70	165	}