Systems and methods for overriding hardwired responses in an HDA codec

A codec comprising:

• an HDA interface configured to couple the codec to an HDA bus;
• a command decoder coupled to the HDA interface and configured to decode a first HDA verb received by the decoder from the HDA bus;
• an interrupt generator configured to generate an interrupt in response to the first HDA verb;
• a first memory configured to store one or more hardwired responses, each of which is associated with a corresponding HDA verb;
• a second memory configured to store the one or more overriding responses, each of which is associated with a corresponding HDA verb;
• a multiplexer configured to select, as an output to the HDA interface, one of a hardwired response associated with the first HDA verb from the first memory and an overriding response associated with the first HDA verb from the second memory;
• and
• a processor configured to receive the interrupt and the first HDA verb, to determine whether the first HDA verb is associated with one of the stored overriding responses, and to control the multiplexer to select either the hardwired response associated with the first HDA verb or the overriding response associated with the first HDA verb.

A method implemented in a High Definition Audio (HDA) codec, the method comprising:

• storing one or more override responses in memory, wherein each of the one or more override responses is associated with a corresponding HDA verb;
• receiving an HDA verb that is associated with a hardwired response;
• determining whether an override response associated with the received HDA verb is stored in the memory;
• if an override response associated with the received HDA verb is stored in the memory, then returning the override response to the received HDA verb that is stored in the memory;
• and
• otherwise, if an override response associated with the received HDA verb is not stored in the memory, then returning the hardwired response to the received HDA verb.

A method implemented in an HDA codec, the method comprising:

• retrieving and decoding an HDA verb from time-multiplexed data;
• identifying a hardwired response associated the HDA verb;
• identifying an override response associated the HDA verb;
• controlling a multiplexer to select either the identified hardwired response or the identified override response;
• and
• returning the selected one of the identified hardwired response and the identified override response.

A system comprising:

• a High Definition Audio (HDA) controller;
• an HDA bus coupled to the HDA controller;
• and
• an HDA codec configured to be coupled to the HDA bus;
• wherein the HDA controller is configured to convey HDA verbs to the HDA codec via the HDA bus;
• and
• wherein the HDA codec includes
• a memory configured to store one or more overriding responses, each of which is associated with a corresponding HDA verb;
• and
• a programmable processor configured to determine, for each HDA verb received from the HDA controller, whether the received HDA verb is associated with one of the overriding responses stored in the memory;
• wherein if the programmable processor determines that the received HDA verb is associated with one of the overriding responses stored in the memory, then the programmable processor causes the associated one of the stored overriding responses to be provided to the HDA bus;
• and
• where if the programmable processor determines that the received HDA verb is not associated with one of the overriding responses stored in the memory, then a hardwired response associated with the received HDA verb is provided to the HDA bus.