@@ -387,9 +387,24 @@ the processing flow the statistics can be drawn from::
+-------------+ | +-------------+
+--> AWB-1
-At present all statistics are drawn from the 0th tap point for each algorithm;
+By default all statistics are drawn from the 0th tap point for each algorithm;
I.E. AEXP statistics from AEXP-0 (A), AWB statistics from AWB-0 and AF
-statistics from AF-0. In the future this will be configurable.
+statistics from AF-0. This is configurable for AEXP and AWB statsistics through
+programming the ISP's parameters.
+
+.. _mali-c55-3a-params:
+
+Programming ISP Parameters
+==========================
+
+The ISP can be programmed with various parameters from userspace to apply to the
+hardware before and during video stream. This allows userspace to dynamically
+change values such as black level, white balance and lens shading gains and so
+on.
+
+The buffer format and how to populate it are described by the
+:ref:`V4L2_META_FMT_MALI_C55_PARAMS <v4l2-meta-fmt-mali-c55-params>` format,
+which should be set as the data format for the `mali-c55 3a params` video node.
References
==========
@@ -1,10 +1,11 @@
.. SPDX-License-Identifier: GPL-2.0
+.. _v4l2-meta-fmt-mali-c55-params:
.. _v4l2-meta-fmt-mali-c55-3a-stats:
-*************************************
-V4L2_META_FMT_MALI_C55_STATS ('C55S')
-*************************************
+*****************************************************************************
+V4L2_META_FMT_MALI_C55_STATS ('C55S'), V4L2_META_FMT_MALI_C55_PARAMS ('C55P')
+*****************************************************************************
3A Statistics
=============
@@ -23,6 +24,65 @@ of the C structure :c:type:`mali_c55_stats_buffer` defined in
For details of the statistics see :c:type:`mali_c55_stats_buffer`.
+Configuration Parameters
+========================
+
+The configuration parameters are passed to the
+:ref:`mali-c55 3a params <mali-c55-3a-params>` metadata output video node, using
+the :c:type:`v4l2_meta_format` interface. Rather than a single struct containing
+sub-structs for each configurable area of the ISP, parameters for the Mali-C55
+are defined as distinct structs or "blocks" which may be added to the data
+member of :c:type:`mali_c55_params_buffer`. Userspace is responsible for
+populating the data member with the blocks that need to be configured by the driver, but
+need not populate it with **all** the blocks, or indeed with any at all if there
+are no configuration changes to make. Populated blocks **must** be consecutive
+in the buffer. To assist both userspace and the driver in identifying the
+blocks each block-specific struct embeds
+:c:type:`mali_c55_params_block_header` as its first member and userspace
+must populate the type member with a value from
+:c:type:`mali_c55_param_block_type`. Once the blocks have been populated
+into the data buffer, the combined size of all populated blocks shall be set in
+the total_size member of :c:type:`mali_c55_params_buffer`. For example:
+
+.. code-block:: c
+
+ struct mali_c55_params_buffer *params =
+ (struct mali_c55_params_buffer *)buffer;
+
+ params->version = MALI_C55_PARAM_BUFFER_V1;
+ params->total_size = 0;
+
+ void *data = (void *)params->data;
+
+ struct mali_c55_params_awb_gains *gains =
+ (struct mali_c55_params_awb_gains *)data;
+
+ gains->header.type = MALI_C55_PARAM_BLOCK_AWB_GAINS;
+ gains->header.enabled = true;
+ gains->header.size = sizeof(struct mali_c55_params_awb_gains);
+
+ gains->gain00 = 256;
+ gains->gain00 = 256;
+ gains->gain00 = 256;
+ gains->gain00 = 256;
+
+ data += sizeof(struct mali_c55_params_awb_gains);
+ params->total_size += sizeof(struct mali_c55_params_awb_gains);
+
+ struct mali_c55_params_sensor_off_preshading *blc =
+ (struct mali_c55_params_sensor_off_preshading *)data;
+
+ blc->header.type = MALI_C55_PARAM_BLOCK_SENSOR_OFFS;
+ blc->header.enabled = true;
+ blc->header.size = sizeof(struct mali_c55_params_sensor_off_preshading);
+
+ blc->chan00 = 51200;
+ blc->chan01 = 51200;
+ blc->chan10 = 51200;
+ blc->chan11 = 51200;
+
+ params->total_size += sizeof(struct mali_c55_params_sensor_off_preshading);
+
Arm Mali-C55 uAPI data types
============================