diff options
Diffstat (limited to 'src/device')
| -rw-r--r-- | src/device/azalia_device.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/device/azalia_device.c b/src/device/azalia_device.c index 283d2f0fa0..e46c27f7b0 100644 --- a/src/device/azalia_device.c +++ b/src/device/azalia_device.c @@ -85,6 +85,31 @@ no_codec: return 0; } +/* + * Find a specific entry within a verb table + * + * @param verb_table: verb table data + * @param verb_table_bytes: verb table size in bytes + * @param viddid: vendor/device to search for + * @param verb: pointer to entry within table + * + * Returns size of the entry within the verb table, + * Returns 0 if the entry is not found + * + * The HDA verb table is composed of dwords. A set of 4 dwords is + * grouped together to form a "jack" descriptor. + * Bits 31:28 - Codec Address + * Bits 27:20 - NID + * Bits 19:8 - Verb ID + * Bits 7:0 - Payload + * + * coreboot groups different codec verb tables into a single table + * and prefixes each with a specific header consisting of 3 + * dword entries: + * 1 - Codec Vendor/Device ID + * 2 - Subsystem ID + * 3 - Number of jacks (groups of 4 dwords) for this codec + */ u32 azalia_find_verb(const u32 *verb_table, u32 verb_table_bytes, u32 viddid, const u32 **verb) { int idx = 0; |