394 lines
10 KiB
C
394 lines
10 KiB
C
// SPDX-License-Identifier: MIT
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/slab.h>
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#include <linux/mxm-wmi.h>
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#include <linux/vga_switcheroo.h>
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#include <drm/drm_edid.h>
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#include <acpi/video.h>
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#include "nouveau_drv.h"
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#include "nouveau_acpi.h"
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#define NOUVEAU_DSM_LED 0x02
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#define NOUVEAU_DSM_LED_STATE 0x00
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#define NOUVEAU_DSM_LED_OFF 0x10
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#define NOUVEAU_DSM_LED_STAMINA 0x11
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#define NOUVEAU_DSM_LED_SPEED 0x12
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#define NOUVEAU_DSM_POWER 0x03
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#define NOUVEAU_DSM_POWER_STATE 0x00
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#define NOUVEAU_DSM_POWER_SPEED 0x01
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#define NOUVEAU_DSM_POWER_STAMINA 0x02
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#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
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#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
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#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
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#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
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#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
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#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
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/* result of the optimus caps function */
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#define OPTIMUS_ENABLED (1 << 0)
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#define OPTIMUS_STATUS_MASK (3 << 3)
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#define OPTIMUS_STATUS_OFF (0 << 3)
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#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
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#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
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#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
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#define OPTIMUS_CAPS_MASK (7 << 24)
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#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
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#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
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#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
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static struct nouveau_dsm_priv {
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bool dsm_detected;
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bool optimus_detected;
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bool optimus_flags_detected;
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bool optimus_skip_dsm;
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acpi_handle dhandle;
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} nouveau_dsm_priv;
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bool nouveau_is_optimus(void) {
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return nouveau_dsm_priv.optimus_detected;
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}
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bool nouveau_is_v1_dsm(void) {
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return nouveau_dsm_priv.dsm_detected;
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}
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#ifdef CONFIG_VGA_SWITCHEROO
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static const guid_t nouveau_dsm_muid =
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GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
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0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
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static const guid_t nouveau_op_dsm_muid =
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GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
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0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
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static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
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{
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int i;
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union acpi_object *obj;
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char args_buff[4];
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union acpi_object argv4 = {
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.buffer.type = ACPI_TYPE_BUFFER,
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.buffer.length = 4,
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.buffer.pointer = args_buff
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};
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/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
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for (i = 0; i < 4; i++)
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args_buff[i] = (arg >> i * 8) & 0xFF;
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*result = 0;
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obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
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func, &argv4, ACPI_TYPE_BUFFER);
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if (!obj) {
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acpi_handle_info(handle, "failed to evaluate _DSM\n");
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return AE_ERROR;
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} else {
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if (obj->buffer.length == 4) {
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*result |= obj->buffer.pointer[0];
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*result |= (obj->buffer.pointer[1] << 8);
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*result |= (obj->buffer.pointer[2] << 16);
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*result |= (obj->buffer.pointer[3] << 24);
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}
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ACPI_FREE(obj);
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}
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return 0;
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}
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/*
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* On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
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* requirements on the fourth parameter, so a private implementation
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* instead of using acpi_check_dsm().
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*/
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static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
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{
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int result;
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/*
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* Function 0 returns a Buffer containing available functions.
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* The args parameter is ignored for function 0, so just put 0 in it
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*/
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if (nouveau_optimus_dsm(handle, 0, 0, &result))
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return 0;
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/*
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* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
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* If the n-th bit is enabled, function n is supported
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*/
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if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
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return result;
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return 0;
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}
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static int nouveau_dsm(acpi_handle handle, int func, int arg)
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{
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int ret = 0;
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union acpi_object *obj;
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union acpi_object argv4 = {
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.integer.type = ACPI_TYPE_INTEGER,
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.integer.value = arg,
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};
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obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
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func, &argv4, ACPI_TYPE_INTEGER);
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if (!obj) {
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acpi_handle_info(handle, "failed to evaluate _DSM\n");
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return AE_ERROR;
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} else {
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if (obj->integer.value == 0x80000002)
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ret = -ENODEV;
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ACPI_FREE(obj);
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}
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return ret;
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}
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static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
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{
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mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
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mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
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return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
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}
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static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
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{
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int arg;
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if (state == VGA_SWITCHEROO_ON)
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arg = NOUVEAU_DSM_POWER_SPEED;
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else
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arg = NOUVEAU_DSM_POWER_STAMINA;
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nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
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return 0;
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}
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static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
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{
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if (!nouveau_dsm_priv.dsm_detected)
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return 0;
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if (id == VGA_SWITCHEROO_IGD)
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return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
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else
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return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
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}
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static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
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enum vga_switcheroo_state state)
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{
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if (id == VGA_SWITCHEROO_IGD)
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return 0;
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/* Optimus laptops have the card already disabled in
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* nouveau_switcheroo_set_state */
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if (!nouveau_dsm_priv.dsm_detected)
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return 0;
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return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
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}
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static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
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{
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/* easy option one - intel vendor ID means Integrated */
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if (pdev->vendor == PCI_VENDOR_ID_INTEL)
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return VGA_SWITCHEROO_IGD;
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/* is this device on Bus 0? - this may need improving */
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if (pdev->bus->number == 0)
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return VGA_SWITCHEROO_IGD;
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return VGA_SWITCHEROO_DIS;
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}
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static const struct vga_switcheroo_handler nouveau_dsm_handler = {
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.switchto = nouveau_dsm_switchto,
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.power_state = nouveau_dsm_power_state,
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.get_client_id = nouveau_dsm_get_client_id,
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};
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static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
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bool *has_mux, bool *has_opt,
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bool *has_opt_flags, bool *has_pr3)
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{
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acpi_handle dhandle;
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bool supports_mux;
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int optimus_funcs;
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struct pci_dev *parent_pdev;
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*has_pr3 = false;
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parent_pdev = pci_upstream_bridge(pdev);
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if (parent_pdev) {
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if (parent_pdev->bridge_d3)
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*has_pr3 = pci_pr3_present(parent_pdev);
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else
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pci_d3cold_disable(pdev);
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}
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dhandle = ACPI_HANDLE(&pdev->dev);
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if (!dhandle)
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return;
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if (!acpi_has_method(dhandle, "_DSM"))
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return;
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supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
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1 << NOUVEAU_DSM_POWER);
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optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
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/* Does not look like a Nvidia device. */
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if (!supports_mux && !optimus_funcs)
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return;
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*dhandle_out = dhandle;
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*has_mux = supports_mux;
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*has_opt = !!optimus_funcs;
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*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
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if (optimus_funcs) {
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uint32_t result;
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nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
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&result);
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dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
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(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
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(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
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(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
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}
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}
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static bool nouveau_dsm_detect(void)
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{
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char acpi_method_name[255] = { 0 };
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struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
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struct pci_dev *pdev = NULL;
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acpi_handle dhandle = NULL;
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bool has_mux = false;
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bool has_optimus = false;
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bool has_optimus_flags = false;
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bool has_power_resources = false;
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int vga_count = 0;
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bool guid_valid;
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bool ret = false;
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/* lookup the MXM GUID */
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guid_valid = mxm_wmi_supported();
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if (guid_valid)
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printk("MXM: GUID detected in BIOS\n");
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/* now do DSM detection */
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while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
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vga_count++;
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nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
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&has_optimus_flags, &has_power_resources);
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}
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while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
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vga_count++;
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nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
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&has_optimus_flags, &has_power_resources);
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}
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/* find the optimus DSM or the old v1 DSM */
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if (has_optimus) {
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nouveau_dsm_priv.dhandle = dhandle;
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acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
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&buffer);
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pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
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acpi_method_name);
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if (has_power_resources)
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pr_info("nouveau: detected PR support, will not use DSM\n");
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nouveau_dsm_priv.optimus_detected = true;
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nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
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nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
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ret = true;
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} else if (vga_count == 2 && has_mux && guid_valid) {
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nouveau_dsm_priv.dhandle = dhandle;
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acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
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&buffer);
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pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
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acpi_method_name);
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nouveau_dsm_priv.dsm_detected = true;
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ret = true;
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}
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return ret;
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}
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void nouveau_register_dsm_handler(void)
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{
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bool r;
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r = nouveau_dsm_detect();
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if (!r)
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return;
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vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
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}
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/* Must be called for Optimus models before the card can be turned off */
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void nouveau_switcheroo_optimus_dsm(void)
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{
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u32 result = 0;
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if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
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return;
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if (nouveau_dsm_priv.optimus_flags_detected)
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nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
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0x3, &result);
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nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
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NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
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}
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void nouveau_unregister_dsm_handler(void)
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{
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if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
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vga_switcheroo_unregister_handler();
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}
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#else
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void nouveau_register_dsm_handler(void) {}
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void nouveau_unregister_dsm_handler(void) {}
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void nouveau_switcheroo_optimus_dsm(void) {}
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#endif
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void *
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nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
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{
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struct acpi_device *acpidev;
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acpi_handle handle;
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int type, ret;
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void *edid;
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switch (connector->connector_type) {
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case DRM_MODE_CONNECTOR_LVDS:
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case DRM_MODE_CONNECTOR_eDP:
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type = ACPI_VIDEO_DISPLAY_LCD;
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break;
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default:
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return NULL;
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}
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handle = ACPI_HANDLE(&dev->pdev->dev);
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if (!handle)
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return NULL;
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ret = acpi_bus_get_device(handle, &acpidev);
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if (ret)
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return NULL;
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ret = acpi_video_get_edid(acpidev, type, -1, &edid);
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if (ret < 0)
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return NULL;
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return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
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}
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