drm/radeon: add new AMD ACPI header and update relevant code (v2)

Add a new header that defines the AMD ACPI interface used
for laptops, PowerXpress, and chipset specific functionality
and update the current code to use it.

Todo:
- properly verify the ACPI interfaces
- hook up and handle ACPI notifications
- make PX code more robust
- implement PCIe Gen and width switching using ACPI

v2: fix typo in header

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 455 insertions, 22 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 3516a6081dcf..5b32e499903b 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -9,6 +9,7 @@
 #include "drm_sarea.h"
 #include "drm_crtc_helper.h"
 #include "radeon.h"
+#include "radeon_acpi.h"
 
 #include <linux/vga_switcheroo.h>
 
@@ -27,7 +28,7 @@ static int radeon_atif_call(acpi_handle handle)
 	atif_arg.pointer = &atif_arg_elements[0];
 
 	atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
-	atif_arg_elements[0].integer.value = 0;
+	atif_arg_elements[0].integer.value = ATIF_FUNCTION_VERIFY_INTERFACE;
 	atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
 	atif_arg_elements[1].integer.value = 0;
 
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.h b/drivers/gpu/drm/radeon/radeon_acpi.h
new file mode 100644
index 000000000000..642aa4719454
--- /dev/null
+++ b/drivers/gpu/drm/radeon/radeon_acpi.h
@@ -0,0 +1,439 @@
+/*
+ * Copyright 2012 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef RADEON_ACPI_H
+#define RADEON_ACPI_H
+
+/* AMD hw uses four ACPI control methods:
+ * 1. ATIF
+ * ARG0: (ACPI_INTEGER) function code
+ * ARG1: (ACPI_BUFFER) parameter buffer, 256 bytes
+ * OUTPUT: (ACPI_BUFFER) output buffer, 256 bytes
+ * ATIF provides an entry point for the gfx driver to interact with the sbios.
+ * The AMD ACPI notification mechanism uses Notify (VGA, 0x81) or a custom
+ * notification. Which notification is used as indicated by the ATIF Control
+ * Method GET_SYSTEM_PARAMETERS. When the driver receives Notify (VGA, 0x81) or
+ * a custom notification it invokes ATIF Control Method GET_SYSTEM_BIOS_REQUESTS
+ * to identify pending System BIOS requests and associated parameters. For
+ * example, if one of the pending requests is DISPLAY_SWITCH_REQUEST, the driver
+ * will perform display device detection and invoke ATIF Control Method
+ * SELECT_ACTIVE_DISPLAYS.
+ *
+ * 2. ATPX
+ * ARG0: (ACPI_INTEGER) function code
+ * ARG1: (ACPI_BUFFER) parameter buffer, 256 bytes
+ * OUTPUT: (ACPI_BUFFER) output buffer, 256 bytes
+ * ATPX methods are used on PowerXpress systems to handle mux switching and
+ * discrete GPU power control.
+ *
+ * 3. ATRM
+ * ARG0: (ACPI_INTEGER) offset of vbios rom data
+ * ARG1: (ACPI_BUFFER) size of the buffer to fill (up to 4K).
+ * OUTPUT: (ACPI_BUFFER) output buffer
+ * ATRM provides an interfacess to access the discrete GPU vbios image on
+ * PowerXpress systems with multiple GPUs.
+ *
+ * 4. ATCS
+ * ARG0: (ACPI_INTEGER) function code
+ * ARG1: (ACPI_BUFFER) parameter buffer, 256 bytes
+ * OUTPUT: (ACPI_BUFFER) output buffer, 256 bytes
+ * ATCS provides an interface to AMD chipset specific functionality.
+ *
+ */
+/* ATIF */
+#define ATIF_FUNCTION_VERIFY_INTERFACE                             0x0
+/* ARG0: ATIF_FUNCTION_VERIFY_INTERFACE
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - version
+ * DWORD - supported notifications mask
+ * DWORD - supported functions bit vector
+ */
+/* Notifications mask */
+#       define ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED               (1 << 0)
+#       define ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED        (1 << 1)
+#       define ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED         (1 << 2)
+#       define ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED    (1 << 3)
+#       define ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED   (1 << 4)
+#       define ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED          (1 << 5)
+#       define ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED                (1 << 6)
+#       define ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED      (1 << 7)
+#       define ATIF_DGPU_DISPLAY_EVENT_SUPPORTED                   (1 << 8)
+/* supported functions vector */
+#       define ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED               (1 << 0)
+#       define ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED            (1 << 1)
+#       define ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED              (1 << 2)
+#       define ATIF_GET_LID_STATE_SUPPORTED                       (1 << 3)
+#       define ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED           (1 << 4)
+#       define ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED             (1 << 5)
+#       define ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED  (1 << 6)
+#       define ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED    (1 << 7)
+#       define ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED     (1 << 12)
+#       define ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED           (1 << 14)
+#define ATIF_FUNCTION_GET_SYSTEM_PARAMETERS                        0x1
+/* ARG0: ATIF_FUNCTION_GET_SYSTEM_PARAMETERS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * DWORD - valid flags mask
+ * DWORD - flags
+ *
+ * OR
+ *
+ * WORD  - structure size in bytes (includes size field)
+ * DWORD - valid flags mask
+ * DWORD - flags
+ * BYTE  - notify command code
+ *
+ * flags
+ * bits 1:0:
+ * 0 - Notify(VGA, 0x81) is not used for notification
+ * 1 - Notify(VGA, 0x81) is used for notification
+ * 2 - Notify(VGA, n) is used for notification where
+ * n (0xd0-0xd9) is specified in notify command code.
+ * bit 2:
+ * 1 - lid changes not reported though int10
+ */
+#define ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS                     0x2
+/* ARG0: ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * DWORD - pending sbios requests
+ * BYTE  - panel expansion mode
+ * BYTE  - thermal state: target gfx controller
+ * BYTE  - thermal state: state id (0: exit state, non-0: state)
+ * BYTE  - forced power state: target gfx controller
+ * BYTE  - forced power state: state id
+ * BYTE  - system power source
+ * BYTE  - panel backlight level (0-255)
+ */
+/* pending sbios requests */
+#       define ATIF_DISPLAY_SWITCH_REQUEST                         (1 << 0)
+#       define ATIF_EXPANSION_MODE_CHANGE_REQUEST                  (1 << 1)
+#       define ATIF_THERMAL_STATE_CHANGE_REQUEST                   (1 << 2)
+#       define ATIF_FORCED_POWER_STATE_CHANGE_REQUEST              (1 << 3)
+#       define ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST             (1 << 4)
+#       define ATIF_DISPLAY_CONF_CHANGE_REQUEST                    (1 << 5)
+#       define ATIF_PX_GFX_SWITCH_REQUEST                          (1 << 6)
+#       define ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST                (1 << 7)
+#       define ATIF_DGPU_DISPLAY_EVENT                             (1 << 8)
+/* panel expansion mode */
+#       define ATIF_PANEL_EXPANSION_DISABLE                        0
+#       define ATIF_PANEL_EXPANSION_FULL                           1
+#       define ATIF_PANEL_EXPANSION_ASPECT                         2
+/* target gfx controller */
+#       define ATIF_TARGET_GFX_SINGLE                              0
+#       define ATIF_TARGET_GFX_PX_IGPU                             1
+#       define ATIF_TARGET_GFX_PX_DGPU                             2
+/* system power source */
+#       define ATIF_POWER_SOURCE_AC                                1
+#       define ATIF_POWER_SOURCE_DC                                2
+#       define ATIF_POWER_SOURCE_RESTRICTED_AC_1                   3
+#       define ATIF_POWER_SOURCE_RESTRICTED_AC_2                   4
+#define ATIF_FUNCTION_SELECT_ACTIVE_DISPLAYS                       0x3
+/* ARG0: ATIF_FUNCTION_SELECT_ACTIVE_DISPLAYS
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - selected displays
+ * WORD  - connected displays
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - selected displays
+ */
+#       define ATIF_LCD1                                           (1 << 0)
+#       define ATIF_CRT1                                           (1 << 1)
+#       define ATIF_TV                                             (1 << 2)
+#       define ATIF_DFP1                                           (1 << 3)
+#       define ATIF_CRT2                                           (1 << 4)
+#       define ATIF_LCD2                                           (1 << 5)
+#       define ATIF_DFP2                                           (1 << 7)
+#       define ATIF_CV                                             (1 << 8)
+#       define ATIF_DFP3                                           (1 << 9)
+#       define ATIF_DFP4                                           (1 << 10)
+#       define ATIF_DFP5                                           (1 << 11)
+#       define ATIF_DFP6                                           (1 << 12)
+#define ATIF_FUNCTION_GET_LID_STATE                                0x4
+/* ARG0: ATIF_FUNCTION_GET_LID_STATE
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - lid state (0: open, 1: closed)
+ *
+ * GET_LID_STATE only works at boot and resume, for general lid
+ * status, use the kernel provided status
+ */
+#define ATIF_FUNCTION_GET_TV_STANDARD_FROM_CMOS                    0x5
+/* ARG0: ATIF_FUNCTION_GET_TV_STANDARD_FROM_CMOS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - 0
+ * BYTE  - TV standard
+ */
+#       define ATIF_TV_STD_NTSC                                    0
+#       define ATIF_TV_STD_PAL                                     1
+#       define ATIF_TV_STD_PALM                                    2
+#       define ATIF_TV_STD_PAL60                                   3
+#       define ATIF_TV_STD_NTSCJ                                   4
+#       define ATIF_TV_STD_PALCN                                   5
+#       define ATIF_TV_STD_PALN                                    6
+#       define ATIF_TV_STD_SCART_RGB                               9
+#define ATIF_FUNCTION_SET_TV_STANDARD_IN_CMOS                      0x6
+/* ARG0: ATIF_FUNCTION_SET_TV_STANDARD_IN_CMOS
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - 0
+ * BYTE  - TV standard
+ * OUTPUT: none
+ */
+#define ATIF_FUNCTION_GET_PANEL_EXPANSION_MODE_FROM_CMOS           0x7
+/* ARG0: ATIF_FUNCTION_GET_PANEL_EXPANSION_MODE_FROM_CMOS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - panel expansion mode
+ */
+#define ATIF_FUNCTION_SET_PANEL_EXPANSION_MODE_IN_CMOS             0x8
+/* ARG0: ATIF_FUNCTION_SET_PANEL_EXPANSION_MODE_IN_CMOS
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - panel expansion mode
+ * OUTPUT: none
+ */
+#define ATIF_FUNCTION_TEMPERATURE_CHANGE_NOTIFICATION              0xD
+/* ARG0: ATIF_FUNCTION_TEMPERATURE_CHANGE_NOTIFICATION
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - gfx controller id
+ * BYTE  - current temperature (degress Celsius)
+ * OUTPUT: none
+ */
+#define ATIF_FUNCTION_GET_GRAPHICS_DEVICE_TYPES                    0xF
+/* ARG0: ATIF_FUNCTION_GET_GRAPHICS_DEVICE_TYPES
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - number of gfx devices
+ * WORD  - device structure size in bytes (excludes device size field)
+ * DWORD - flags         \
+ * WORD  - bus number     } repeated structure
+ * WORD  - device number /
+ */
+/* flags */
+#       define ATIF_PX_REMOVABLE_GRAPHICS_DEVICE                   (1 << 0)
+#       define ATIF_XGP_PORT                                       (1 << 1)
+#       define ATIF_VGA_ENABLED_GRAPHICS_DEVICE                    (1 << 2)
+#       define ATIF_XGP_PORT_IN_DOCK                               (1 << 3)
+
+/* ATPX */
+#define ATPX_FUNCTION_VERIFY_INTERFACE                             0x0
+/* ARG0: ATPX_FUNCTION_VERIFY_INTERFACE
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - version
+ * DWORD - supported functions bit vector
+ */
+/* supported functions vector */
+#       define ATPX_GET_PX_PARAMETERS_SUPPORTED                    (1 << 0)
+#       define ATPX_POWER_CONTROL_SUPPORTED                        (1 << 1)
+#       define ATPX_DISPLAY_MUX_CONTROL_SUPPORTED                  (1 << 2)
+#       define ATPX_I2C_MUX_CONTROL_SUPPORTED                      (1 << 3)
+#       define ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED (1 << 4)
+#       define ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED   (1 << 5)
+#       define ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED       (1 << 7)
+#       define ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED          (1 << 8)
+#define ATPX_FUNCTION_GET_PX_PARAMETERS                            0x1
+/* ARG0: ATPX_FUNCTION_GET_PX_PARAMETERS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * DWORD - valid flags mask
+ * DWORD - flags
+ */
+/* flags */
+#       define ATPX_LVDS_I2C_AVAILABLE_TO_BOTH_GPUS                (1 << 0)
+#       define ATPX_CRT1_I2C_AVAILABLE_TO_BOTH_GPUS                (1 << 1)
+#       define ATPX_DVI1_I2C_AVAILABLE_TO_BOTH_GPUS                (1 << 2)
+#       define ATPX_CRT1_RGB_SIGNAL_MUXED                          (1 << 3)
+#       define ATPX_TV_SIGNAL_MUXED                                (1 << 4)
+#       define ATPX_DFP_SIGNAL_MUXED                               (1 << 5)
+#       define ATPX_SEPARATE_MUX_FOR_I2C                           (1 << 6)
+#       define ATPX_DYNAMIC_PX_SUPPORTED                           (1 << 7)
+#       define ATPX_ACF_NOT_SUPPORTED                              (1 << 8)
+#       define ATPX_FIXED_NOT_SUPPORTED                            (1 << 9)
+#       define ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED               (1 << 10)
+#       define ATPX_DGPU_REQ_POWER_FOR_DISPLAYS                    (1 << 11)
+#define ATPX_FUNCTION_POWER_CONTROL                                0x2
+/* ARG0: ATPX_FUNCTION_POWER_CONTROL
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - dGPU power state (0: power off, 1: power on)
+ * OUTPUT: none
+ */
+#define ATPX_FUNCTION_DISPLAY_MUX_CONTROL                          0x3
+/* ARG0: ATPX_FUNCTION_DISPLAY_MUX_CONTROL
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - display mux control (0: iGPU, 1: dGPU)
+ * OUTPUT: none
+ */
+#       define ATPX_INTEGRATED_GPU                                 0
+#       define ATPX_DISCRETE_GPU                                   1
+#define ATPX_FUNCTION_I2C_MUX_CONTROL                              0x4
+/* ARG0: ATPX_FUNCTION_I2C_MUX_CONTROL
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - i2c/aux/hpd mux control (0: iGPU, 1: dGPU)
+ * OUTPUT: none
+ */
+#define ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION    0x5
+/* ARG0: ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - target gpu (0: iGPU, 1: dGPU)
+ * OUTPUT: none
+ */
+#define ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION      0x6
+/* ARG0: ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - target gpu (0: iGPU, 1: dGPU)
+ * OUTPUT: none
+ */
+#define ATPX_FUNCTION_GET_DISPLAY_CONNECTORS_MAPPING               0x8
+/* ARG0: ATPX_FUNCTION_GET_DISPLAY_CONNECTORS_MAPPING
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - number of display connectors
+ * WORD  - connector structure size in bytes (excludes connector size field)
+ * BYTE  - flags                                                     \
+ * BYTE  - ATIF display vector bit position                           } repeated
+ * BYTE  - adapter id (0: iGPU, 1-n: dGPU ordered by pcie bus number) } structure
+ * WORD  - connector ACPI id                                         /
+ */
+/* flags */
+#       define ATPX_DISPLAY_OUTPUT_SUPPORTED_BY_ADAPTER_ID_DEVICE  (1 << 0)
+#       define ATPX_DISPLAY_HPD_SUPPORTED_BY_ADAPTER_ID_DEVICE     (1 << 1)
+#       define ATPX_DISPLAY_I2C_SUPPORTED_BY_ADAPTER_ID_DEVICE     (1 << 2)
+#define ATPX_FUNCTION_GET_DISPLAY_DETECTION_PORTS                  0x9
+/* ARG0: ATPX_FUNCTION_GET_DISPLAY_DETECTION_PORTS
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - number of HPD/DDC ports
+ * WORD  - port structure size in bytes (excludes port size field)
+ * BYTE  - ATIF display vector bit position \
+ * BYTE  - hpd id                            } reapeated structure
+ * BYTE  - ddc id                           /
+ *
+ * available on A+A systems only
+ */
+/* hpd id */
+#       define ATPX_HPD_NONE                                       0
+#       define ATPX_HPD1                                           1
+#       define ATPX_HPD2                                           2
+#       define ATPX_HPD3                                           3
+#       define ATPX_HPD4                                           4
+#       define ATPX_HPD5                                           5
+#       define ATPX_HPD6                                           6
+/* ddc id */
+#       define ATPX_DDC_NONE                                       0
+#       define ATPX_DDC1                                           1
+#       define ATPX_DDC2                                           2
+#       define ATPX_DDC3                                           3
+#       define ATPX_DDC4                                           4
+#       define ATPX_DDC5                                           5
+#       define ATPX_DDC6                                           6
+#       define ATPX_DDC7                                           7
+#       define ATPX_DDC8                                           8
+
+/* ATCS */
+#define ATCS_FUNCTION_VERIFY_INTERFACE                             0x0
+/* ARG0: ATCS_FUNCTION_VERIFY_INTERFACE
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - version
+ * DWORD - supported functions bit vector
+ */
+/* supported functions vector */
+#       define ATCS_GET_EXTERNAL_STATE_SUPPORTED                   (1 << 0)
+#       define ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED             (1 << 1)
+#       define ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED       (1 << 2)
+#       define ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED                   (1 << 3)
+#define ATCS_FUNCTION_GET_EXTERNAL_STATE                           0x1
+/* ARG0: ATCS_FUNCTION_GET_EXTERNAL_STATE
+ * ARG1: none
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * DWORD - valid flags mask
+ * DWORD - flags (0: undocked, 1: docked)
+ */
+/* flags */
+#       define ATCS_DOCKED                                         (1 << 0)
+#define ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST                     0x2
+/* ARG0: ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num)
+ * WORD  - valid flags mask
+ * WORD  - flags
+ * BYTE  - request type
+ * BYTE  - performance request
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - return value
+ */
+/* flags */
+#       define ATCS_ADVERTISE_CAPS                                 (1 << 0)
+#       define ATCS_WAIT_FOR_COMPLETION                            (1 << 1)
+/* request type */
+#       define ATCS_PCIE_LINK_SPEED                                1
+/* performance request */
+#       define ATCS_REMOVE                                         0
+#       define ATCS_FORCE_LOW_POWER                                1
+#       define ATCS_PERF_LEVEL_1                                   2 /* PCIE Gen 1 */
+#       define ATCS_PERF_LEVEL_2                                   3 /* PCIE Gen 2 */
+#       define ATCS_PERF_LEVEL_3                                   4 /* PCIE Gen 3 */
+/* return value */
+#       define ATCS_REQUEST_REFUSED                                1
+#       define ATCS_REQUEST_COMPLETE                               2
+#       define ATCS_REQUEST_IN_PROGRESS                            3
+#define ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION               0x3
+/* ARG0: ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION
+ * ARG1: none
+ * OUTPUT: none
+ */
+#define ATCS_FUNCTION_SET_PCIE_BUS_WIDTH                           0x4
+/* ARG0: ATCS_FUNCTION_SET_PCIE_BUS_WIDTH
+ * ARG1:
+ * WORD  - structure size in bytes (includes size field)
+ * WORD  - client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num)
+ * BYTE  - number of active lanes
+ * OUTPUT:
+ * WORD  - structure size in bytes (includes size field)
+ * BYTE  - number of active lanes
+ */
+
+#endif
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 2a2cf0b88a28..950a1ac95d6a 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -12,18 +12,7 @@
 #include <acpi/acpi_bus.h>
 #include <linux/pci.h>
 
-#define ATPX_VERSION 0
-#define ATPX_GPU_PWR 2
-#define ATPX_MUX_SELECT 3
-#define ATPX_I2C_MUX_SELECT 4
-#define ATPX_SWITCH_START 5
-#define ATPX_SWITCH_END 6
-
-#define ATPX_INTEGRATED 0
-#define ATPX_DISCRETE 1
-
-#define ATPX_MUX_IGD 0
-#define ATPX_MUX_DISCRETE 1
+#include "radeon_acpi.h"
 
 static struct radeon_atpx_priv {
 	bool atpx_detected;
@@ -43,10 +32,10 @@ static int radeon_atpx_get_version(acpi_handle handle)
 	atpx_arg.pointer = &atpx_arg_elements[0];
 
 	atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
-	atpx_arg_elements[0].integer.value = ATPX_VERSION;
+	atpx_arg_elements[0].integer.value = ATPX_FUNCTION_VERIFY_INTERFACE;
 
 	atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
-	atpx_arg_elements[1].integer.value = ATPX_VERSION;
+	atpx_arg_elements[1].integer.value = 0;
 
 	status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
 	if (ACPI_FAILURE(status)) {
@@ -96,27 +85,31 @@ static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
 
 static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
 {
-	return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
+	return radeon_atpx_execute(handle, ATPX_FUNCTION_POWER_CONTROL, state);
 }
 
 static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
 {
-	return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
+	return radeon_atpx_execute(handle, ATPX_FUNCTION_DISPLAY_MUX_CONTROL, mux_id);
 }
 
 static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
 {
-	return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
+	return radeon_atpx_execute(handle, ATPX_FUNCTION_I2C_MUX_CONTROL, mux_id);
 }
 
 static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
 {
-	return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
+	return radeon_atpx_execute(handle,
+				   ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
+				   gpu_id);
 }
 
 static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
 {
-	return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
+	return radeon_atpx_execute(handle,
+				   ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
+				   gpu_id);
 }
 
 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
@@ -124,9 +117,9 @@ static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
 	int gpu_id;
 
 	if (id == VGA_SWITCHEROO_IGD)
-		gpu_id = ATPX_INTEGRATED;
+		gpu_id = ATPX_INTEGRATED_GPU;
 	else
-		gpu_id = ATPX_DISCRETE;
+		gpu_id = ATPX_DISCRETE_GPU;
 
 	radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
 	radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);