mirrors/u-boot
0
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2025-01-20 09:43:53 +08:00
Code Issues Packages Projects Releases Wiki Activity

dm: acpi: Add support for the NHLT table

Browse Source 
The Intel Non-High-Definition-Audio Link Table (NHLT) table describes the
audio codecs and connections in a system. Various devices can contribute
information to produce the table.

Add core support for this, based on a structure which is built up through
calls to the driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
This commit is contained in:
Simon Glass 2020-07-07 21:32:08 -06:00 committed by Bin Meng
parent f18589576c
commit b4e8433418
2 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/core/acpi.c
View File

@ -31,6 +31,7 @@ enum method_t {
METHOD_WRITE_TABLES,
METHOD_FILL_SSDT,
METHOD_INJECT_DSDT,
METHOD_SETUP_NHLT,
};
/* Prototype for all methods */
@ -248,6 +249,8 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method)
return aops->fill_ssdt;
case METHOD_INJECT_DSDT:
return aops->inject_dsdt;
case METHOD_SETUP_NHLT:
return aops->setup_nhlt;
}
}
@ -334,3 +337,15 @@ int acpi_write_dev_tables(struct acpi_ctx *ctx)
return ret;
}
int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt)
{
int ret;
log_debug("Setup NHLT\n");
ctx->nhlt = nhlt;
ret = acpi_recurse_method(ctx, dm_root(), METHOD_SETUP_NHLT, TYPE_NONE);
log_debug("Setup finished, err=%d\n", ret);
return ret;
}

26
include/dm/acpi.h
View File

@ -27,6 +27,8 @@
#if !defined(__ACPI__)
struct nhlt;
/** enum acpi_dump_option - selects what ACPI information to dump */
enum acpi_dump_option {
ACPI_DUMP_LIST, /* Just the list of items */
@ -44,6 +46,9 @@ enum acpi_dump_option {
* adding a new table. The RSDP holds pointers to the RSDT and XSDT.
* @rsdt: Pointer to the Root System Description Table
* @xsdt: Pointer to the Extended System Description Table
* @nhlt: Intel Non-High-Definition-Audio Link Table (NHLT) pointer, used to
* build up information that audio codecs need to provide in the NHLT ACPI
* table
* @len_stack: Stack of 'length' words to fix up later
* @ltop: Points to current top of stack (0 = empty)
*/
@ -53,6 +58,7 @@ struct acpi_ctx {
struct acpi_rsdp *rsdp;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt;
struct nhlt *nhlt;
char *len_stack[ACPIGEN_LENSTACK_SIZE];
int ltop;
};
@ -113,6 +119,15 @@ struct acpi_ops {
* @return 0 if OK, -ve on error
*/
int (*inject_dsdt)(const struct udevice *dev, struct acpi_ctx *ctx);
/**
* setup_nhlt() - Set up audio information for this device
*
* The method can add information to ctx->nhlt if it likes
*
* @return 0 if OK, -ENODATA if nothing to add, -ve on error
*/
int (*setup_nhlt)(const struct udevice *dev, struct acpi_ctx *ctx);
};
#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
@ -177,6 +192,17 @@ int acpi_fill_ssdt(struct acpi_ctx *ctx);
*/
int acpi_inject_dsdt(struct acpi_ctx *ctx);
/**
* acpi_setup_nhlt() - Set up audio information
*
* This is called to set up the nhlt information for all devices.
*
* @ctx: ACPI context to use
* @nhlt: Pointer to nhlt information to add to
* @return 0 if OK, -ve on error
*/
int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt);
/**
* acpi_dump_items() - Dump out the collected ACPI items
*