diff options
| -rw-r--r-- | src/soc/amd/common/block/graphics/Kconfig | 8 | ||||
| -rw-r--r-- | src/soc/amd/common/block/graphics/graphics.c | 101 |
2 files changed, 109 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/graphics/Kconfig b/src/soc/amd/common/block/graphics/Kconfig index 8aa2a20a3c..4cda353c5f 100644 --- a/src/soc/amd/common/block/graphics/Kconfig +++ b/src/soc/amd/common/block/graphics/Kconfig @@ -3,3 +3,11 @@ config SOC_AMD_COMMON_BLOCK_GRAPHICS default n help Select this option to use AMD common graphics driver support. + +config SOC_AMD_COMMON_BLOCK_GRAPHICS_ATIF + bool + depends on SOC_AMD_COMMON_BLOCK_GRAPHICS + help + Select this option to provide ATIF method with display brightness querying. + Currently, the exported values only open up 0-255 as the brightness range for + the display. diff --git a/src/soc/amd/common/block/graphics/graphics.c b/src/soc/amd/common/block/graphics/graphics.c index 466a91c666..24cabfe454 100644 --- a/src/soc/amd/common/block/graphics/graphics.c +++ b/src/soc/amd/common/block/graphics/graphics.c @@ -1,13 +1,114 @@ /* SPDX-License-Identifier: GPL-2.0-or-later */ #include <acpi/acpi_device.h> +#include <acpi/acpigen.h> #include <device/pci.h> #include <device/pci_ids.h> +#define ATIF_FUNCTION_VERIFY_INTERFACE 0x0 +struct atif_verify_interface_output { + uint16_t size; /* Size of this object, including size field */ + uint16_t version; + uint32_t supported_notifications; + uint32_t supported_functions; /* Bit n set if function n+1 supported. */ +}; + +#define ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS 0x10 +# define ATIF_QBTC_REQUEST_LCD1 0 +/* error codes */ +# define ATIF_QBTC_ERROR_CODE_SUCCESS 0 +# define ATIF_QBTC_ERROR_CODE_FAILURE 1 +# define ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED 2 +struct atif_brightness_input { + uint16_t size; + /* ATIF doc indicates this field is a word, but the kernel drivers uses a byte. */ + uint8_t requested_display; +}; +struct atif_brightness_output { + uint16_t size; /* Size of this object, including size field. */ + uint16_t flags; /* Currently all reserved. */ + uint8_t error_code; + /* default brightness fields currently ignored by Linux driver. */ + uint8_t default_brightness_ac; /* Percentage brightness when connected to AC. */ + uint8_t default_brightness_dc; /* Percentage brightness when connected to DC. */ + /* The following 2 fields are the only ones honored by Linux driver currently. */ + uint8_t min_input_signal_level; /* 0-255 corresponding to 0% */ + uint8_t max_input_signal_level; /* 0-255 corresponding to 100% */ + /* Array of data points consisting of: + * { uint8_t luminance_level; (percent) + * uint8_t input_signal_level; (0-255 in value) } + * Linux ignores these fields so no support currently. */ + uint8_t count_data_points; /* Count of data points. */ +}; + +static void generate_atif(const struct device *dev) +{ + struct atif_verify_interface_output verify_output = { + .size = sizeof(verify_output), + .version = 1, + .supported_functions = + BIT(ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS - 1), + }; + struct atif_brightness_output brightness_error = { + .size = sizeof(brightness_error), + .error_code = ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED, + }; + struct atif_brightness_output brightness_out = { + .size = sizeof(brightness_out), + .error_code = ATIF_QBTC_ERROR_CODE_SUCCESS, + .min_input_signal_level = 0, + .max_input_signal_level = 255, + }; + + /* Scope (\_SB.PCI0.PBRA.IGFX) */ + acpigen_write_scope(acpi_device_path(dev)); + /* Method (ATIF, 2, NotSerialized) */ + acpigen_write_method("ATIF", 2); + /* ToInteger (Arg0, Local0) */ + acpigen_write_to_integer(ARG0_OP, LOCAL0_OP); + + /* If ((Local0 == Zero)) */ + acpigen_write_if_lequal_op_int(LOCAL0_OP, ATIF_FUNCTION_VERIFY_INTERFACE); + /* Return (Buffer (0x0C) { ... } */ + acpigen_write_return_byte_buffer((uint8_t *)(void *)&verify_output, + sizeof(verify_output)); + acpigen_pop_len(); /* if (LEqual(Local0, 0) */ + + /* ElseIf ((Local0 == 0x10)) */ + acpigen_write_else(); + acpigen_write_if_lequal_op_int(LOCAL0_OP, + ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS); + /* CreateByteField (Arg1, 0x02, DISP) */ + acpigen_write_create_byte_field(ARG1_OP, + offsetof(struct atif_brightness_input, requested_display), "DISP"); + /* ToInteger (DISP, Local1) */ + acpigen_write_to_integer_from_namestring("DISP", LOCAL1_OP); + /* If ((Local1 == Zero)) */ + acpigen_write_if_lequal_op_int(LOCAL1_OP, ATIF_QBTC_REQUEST_LCD1); + /* Return (Buffer (0x0A) { ... } */ + acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_out, + sizeof(brightness_out)); + acpigen_pop_len(); /* if (LEqual(Local2, ATIF_QBTC_REQUEST_LCD1) */ + /* Else */ + acpigen_write_else(); + /* Return (Buffer (0x0A) */ + acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_error, + sizeof(brightness_error)); + acpigen_pop_len(); /* else */ + + acpigen_pop_len(); /* if (LEqual(Local0, 0x10) */ + acpigen_pop_len(); /* else */ + + acpigen_pop_len(); /* Method */ + acpigen_pop_len(); /* Scope */ +} + static void graphics_fill_ssdt(const struct device *dev) { acpi_device_write_pci_dev(dev); pci_rom_ssdt(dev); + if (CONFIG(SOC_AMD_COMMON_BLOCK_GRAPHICS_ATIF)) + generate_atif(dev); } static const char *graphics_acpi_name(const struct device *dev) |