[PATCH v5 16/16] Documentation: mali-c55: Document the mali-c55 parameter setting

[Daniel Scally]

Document the mali-c55 parameter setting by expanding the relevant
pages in both admin-guide/ and userspace-api/.

Acked-by: Nayden Kanchev  <nayden.kanchev at arm.com>
Co-developed-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally at ideasonboard.com>
---
Changes in v5:

	- New patch

 Documentation/admin-guide/media/mali-c55.rst  | 19 +++++-
 .../media/v4l/metafmt-arm-mali-c55.rst        | 65 ++++++++++++++++++-
 2 files changed, 79 insertions(+), 5 deletions(-)

diff --git a/Documentation/admin-guide/media/mali-c55.rst b/Documentation/admin-guide/media/mali-c55.rst
index b75437f6e96a..c5e6ac826c99 100644
--- a/Documentation/admin-guide/media/mali-c55.rst
+++ b/Documentation/admin-guide/media/mali-c55.rst
@@ -380,9 +380,24 @@ 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
 ==========
diff --git a/Documentation/userspace-api/media/v4l/metafmt-arm-mali-c55.rst b/Documentation/userspace-api/media/v4l/metafmt-arm-mali-c55.rst
index 219a5dd42d70..c359d2c83858 100644
--- a/Documentation/userspace-api/media/v4l/metafmt-arm-mali-c55.rst
+++ b/Documentation/userspace-api/media/v4l/metafmt-arm-mali-c55.rst
@@ -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_3A_STATS ('C55S')
-****************************************
+********************************************************************************
+V4L2_META_FMT_MALI_C55_3A_STATS ('C55S'), V4L2_META_FMT_MALI_C55_PARAMS ('C55P')
+********************************************************************************
 
 3A Statistics
 =============
@@ -22,6 +23,64 @@ 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 struct 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 should embed
+struct mali_c55_params_block_header as its first member and userspace must
+populate the type member with a value from enum mali_c55_param_block_type. Once
+the blocks have been populated into the data buffer, the combined size of all
+populated blocks should be set in the total_size member of
+struct 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_V0;
+
+	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)
+
+	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_awb_gains) +
+			     sizeof(struct mali_c55_params_sensor_off_preshading);
+
 Arm Mali-C55 uAPI data types
 ============================
 
-- 
2.34.1