[PATCH 05/10] media: v4l: Add Keem Bay Camera meta buffer formats

[Martina Krasteva <martinax.krasteva@linux.intel.com>]

From: Gjorgji Rosikopulos <gjorgjix.rosikopulos@intel.com>

Add Keem Bay Camera specific meta formats for processing
parameters and statistics:

    V4L2_META_FMT_KMB_PARAMS
    V4L2_META_FMT_KMB_STATS

Signed-off-by: Gjorgji Rosikopulos <gjorgjix.rosikopulos@intel.com>
Co-developed-by: Ivan Dimitrov <ivanx.dimitrov@intel.com>
Signed-off-by: Ivan Dimitrov <ivanx.dimitrov@intel.com>
Co-developed-by: Martina Krasteva <martinax.krasteva@intel.com>
Signed-off-by: Martina Krasteva <martinax.krasteva@intel.com>
Acked-by: Paul J. Murphy <paul.j.murphy@intel.com>
Acked-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
---
 .../userspace-api/media/v4l/meta-formats.rst       |  1 +
 .../media/v4l/pixfmt-meta-intel-kmb.rst            | 98 ++++++++++++++++++++++
 MAINTAINERS                                        |  2 +
 include/uapi/linux/videodev2.h                     |  4 +
 4 files changed, 105 insertions(+)
 create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-meta-intel-kmb.rst

diff --git a/Documentation/userspace-api/media/v4l/meta-formats.rst b/Documentation/userspace-api/media/v4l/meta-formats.rst
index fff25357fe86..cb85161dc1ae 100644
--- a/Documentation/userspace-api/media/v4l/meta-formats.rst
+++ b/Documentation/userspace-api/media/v4l/meta-formats.rst
@@ -14,6 +14,7 @@ These formats are used for the :ref:`metadata` interface only.
 
     pixfmt-meta-d4xx
     pixfmt-meta-intel-ipu3
+    pixfmt-meta-intel-kmb
     pixfmt-meta-rkisp1
     pixfmt-meta-uvc
     pixfmt-meta-vsp1-hgo
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-meta-intel-kmb.rst b/Documentation/userspace-api/media/v4l/pixfmt-meta-intel-kmb.rst
new file mode 100644
index 000000000000..99615bbed106
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/pixfmt-meta-intel-kmb.rst
@@ -0,0 +1,98 @@
+.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
+
+.. _v4l2-meta-fmt-params:
+.. _v4l2-meta-fmt-stats:
+
+*******************************************************************
+V4L2_META_FMT_KMB_PARAMS ('kmbp'), V4L2_META_FMT_KMB_STATS ('kmbs')
+*******************************************************************
+
+.. kmb_isp_stats
+
+ISP statistics
+==============
+
+The Keembay ISP statistics blocks collect different statistics over
+an input Bayer frame in non-HDR mode, or up to three input Bayer frames
+in HDR mode. Those statistics are obtained from the "keembay-metadata-stats"
+metadata capture video node, using the :c:type:`v4l2_meta_format` interface.
+They are formatted as described by the :c:type:`kmb_isp_stats` structure.
+
+The statistics collected are AE/AWB (Auto-exposure/Auto-white balance),
+AF (Auto-focus) filter response, luma histogram, rgb histograms and dehaze statistics.
+Dehaze statistic are collected after HDR fusion in HDR mode.
+
+The struct :c:type:`kmb_isp_params` contain all configurable parameters for the
+statistics:
+
+- The struct :c:type:`kmb_raw_params` contain enable flags for all
+  statistics except dehaze (always enabled) and configuration for flicker rows
+  statistics.
+- The struct :c:type:`kmb_ae_awb_params` contain configuration parameters for AE/AWB
+  statistics.
+- The struct :c:type:`kmb_af_params` contain configuration for AF (Auto-focus) filter
+  response statistics.
+- The struct :c:type:`kmb_hist_params` contain configuration for luma and rgb histograms.
+- The struct :c:type:`kmb_hist_params` contain configuration for luma and rgb histograms.
+- The struct :c:type:`kmb_dehaze_params` contain configuration for dehaze statistics.
+
+.. code-block:: c
+
+	struct kmb_isp_stats {
+		struct {
+			__u8 ae_awb_stats[KMB_CAM_AE_AWB_STATS_SIZE];
+			__u8 af_stats[KMB_CAM_AF_STATS_SIZE];
+			__u8 hist_luma[KMB_CAM_HIST_LUMA_SIZE];
+			__u8 hist_rgb[KMB_CAM_HIST_RGB_SIZE];
+			__u8 flicker_rows[KMB_CAM_FLICKER_ROWS_SIZE];
+		} exposure[KMB_CAM_MAX_EXPOSURES];
+		__u8 dehaze[MAX_DHZ_AIRLIGHT_STATS_SIZE];
+		struct kmb_isp_stats_flags update;
+	};
+
+.. kmb_isp_stats
+
+ISP parameters
+==============
+
+The ISP parameters are passed to the "keembay-metadata-params" metadata
+output video node, using the :c:type:`v4l2_meta_format` interface. They are
+formatted as described by the :c:type:`kmb_isp_params` structure.
+
+Both ISP statistics and ISP parameters described here are closely tied to
+the underlying camera sub-system (VPU Camera) APIs. They are usually consumed
+and produced by dedicated user space libraries that comprise the important
+tuning tools, thus freeing the developers from being bothered with the low
+level hardware and algorithm details.
+
+.. code-block:: c
+
+	struct kmb_isp_params {
+		struct kmb_isp_params_flags update;
+		struct kmb_blc_params blc[KMB_CAM_MAX_EXPOSURES];
+		struct kmb_sigma_dns_params sigma_dns[KMB_CAM_MAX_EXPOSURES];
+		struct kmb_lsc_params lsc;
+		struct kmb_raw_params raw;
+		struct kmb_ae_awb_params ae_awb;
+		struct kmb_af_params af;
+		struct kmb_hist_params histogram;
+		struct kmb_lca_params lca;
+		struct kmb_debayer_params debayer;
+		struct kmb_dog_dns_params dog_dns;
+		struct kmb_luma_dns_params luma_dns;
+		struct kmb_sharpen_params sharpen;
+		struct kmb_chroma_gen_params chroma_gen;
+		struct kmb_median_params median;
+		struct kmb_chroma_dns_params chroma_dns;
+		struct kmb_color_comb_params color_comb;
+		struct kmb_hdr_params hdr;
+		struct kmb_lut_params lut;
+		struct kmb_tnf_params tnf;
+		struct kmb_dehaze_params dehaze;
+		struct kmb_warp_params warp;
+	};
+
+Keembay ISP uAPI data types
+===============================
+
+.. kernel-doc:: include/uapi/linux/keembay-isp-ctl.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 955f9f6a195d..d90eaf453012 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1972,6 +1972,8 @@ L:	linux-media@vger.kernel.org
 S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
 F:	Documentation/devicetree/bindings/media/intel,keembay-camera.yaml
+F:	Documentation/media/uapi/v4l/meta-formats.rst
+F:	Documentation/media/uapi/v4l/pixfmt-meta-intel-kmb.rst
 F:	drivers/media/platform/keembay-camera/
 F:	include/uapi/linux/keembay-isp-ctl.h
 
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 79dbde3bcf8d..0d32269638f6 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -769,6 +769,10 @@ struct v4l2_pix_format {
 #define V4L2_META_FMT_RK_ISP1_PARAMS	v4l2_fourcc('R', 'K', '1', 'P') /* Rockchip ISP1 3A Parameters */
 #define V4L2_META_FMT_RK_ISP1_STAT_3A	v4l2_fourcc('R', 'K', '1', 'S') /* Rockchip ISP1 3A Statistics */
 
+/* Vendor specific - used for Keem Bay camera sub-system */
+#define V4L2_META_FMT_KMB_PARAMS v4l2_fourcc('K', 'M', 'B', 'P') /* Keem Bay parameters */
+#define V4L2_META_FMT_KMB_STATS  v4l2_fourcc('K', 'M', 'B', 'S') /* Keem Bay statistics */
+
 /* priv field value to indicates that subsequent fields are valid. */
 #define V4L2_PIX_FMT_PRIV_MAGIC		0xfeedcafe
 
-- 
2.11.0