Document the mali-c55 parameter setting by expanding the relevant pages in both admin-guide/ and userspace-api/. Acked-by: Nayden Kanchev <nayden.kanchev@xxxxxxx> Co-developed-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx> Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx> Signed-off-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx> --- 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