Shared dynamic buffer in image signal processor

A method comprising:

• initiating an exchange with a system memory for image data to be processed in an image processing circuit of an image signal processor;
• storing, in a buffer of the image signal processor, the image data from a response of the system memory, the buffer comprising a shared section dynamically allocated among the image processing circuit and other image processing circuits in the image signal processor;
• allocating a number of data credits for the shared section to the image processing circuit;
• determining total allocated blocks for the shared section to the image processing circuit, the total allocated blocks comprising a first number of blocks allocated for pending requests made by the image processing circuit that have not received a response from the system memory, and a second number of blocks storing data received from the system memory and pending to be consumed by the image processing circuit;
• and
• reducing or preventing allocation of additional data credits separated from the number of data credits already allocated to the image processing circuit for at least a duration in which the total allocated blocks occupied by the one of the image processing circuits exceed a throttling threshold responsive to determining that the total allocated blocks exceed the throttling threshold.

A computing device, comprising:

• an image sensor configured to capture image data;
• a system memory coupled to the image sensor, the system memory configured to store the image data;
• and
• an image signal processor coupled to the system memory, the image signal processor configured to:
• initiate an exchange with the system memory for the image data to be processed in an image processing circuit in the image signal processor;
• store, in a buffer of the image signal processor, the image data from a response of the system memory, the buffer comprising a shared section dynamically allocated among the image processing circuit and other image processing circuits in the image signal processor;
• allocate a number of data credits for the shared section to the image processing circuit;
• determine total allocated blocks for the shared section to the image processing circuit, the total allocated blocks comprising a first number of blocks allocated for pending requests made by the image processing circuit that have not received a response from the system memory, and a second number of blocks storing data received from the system memory and pending to be consumed by the image processing circuit;
• and
• reduce or prevent allocation of additional data credits separated from the number of data credits already allocated to the image processing circuit for at least a duration in which the total allocated blocks occupied by the one of the image processing circuits exceed a throttling threshold responsive to determining that the total allocated blocks exceed the throttling threshold.