diff options
| -rw-r--r-- | src/acpi/device.c | 16 | ||||
| -rw-r--r-- | src/include/acpi/acpi_device.h | 9 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/acpi/device.c b/src/acpi/device.c index 2b085b61a6..b732b8f36a 100644 --- a/src/acpi/device.c +++ b/src/acpi/device.c @@ -1183,3 +1183,19 @@ void acpi_device_write_pci_dev(const struct device *dev) acpigen_pop_len(); /* Device */ acpigen_pop_len(); /* Scope */ } + +/* ID for the DmaProperty _DSD */ +#define ACPI_DSD_DMA_PROPERTY_UUID "70D24161-6DD5-4C9E-8070-705531292865" + +/* _DSD with DmaProperty */ +void acpi_device_add_dma_property(struct acpi_dp *dsd) +{ + struct acpi_dp *prev_dsd = dsd, *pkg; + if (prev_dsd == NULL) + dsd = acpi_dp_new_table("_DSD"); + pkg = acpi_dp_new_table(ACPI_DSD_DMA_PROPERTY_UUID); + acpi_dp_add_integer(pkg, "DmaProperty", 1); + acpi_dp_add_package(dsd, pkg); + if (prev_dsd == NULL) + acpi_dp_write(dsd); +} diff --git a/src/include/acpi/acpi_device.h b/src/include/acpi/acpi_device.h index 71809eb6d4..1493cb4cc9 100644 --- a/src/include/acpi/acpi_device.h +++ b/src/include/acpi/acpi_device.h @@ -588,4 +588,13 @@ void acpi_dp_write(struct acpi_dp *table); */ void acpi_device_write_pci_dev(const struct device *dev); +/* + * Helper function to add DmaProperty to _DSD in the current scope. + * + * dsd - Pointer to a _DSD object. + * Append to existing _DSD object if not NULL. + * Create new _DSD object and flush it if NULL. + */ +void acpi_device_add_dma_property(struct acpi_dp *dsd); + #endif /* __ACPI_ACPI_DEVICE_H__ */ |