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media: rkisp1: Add support for CAC

The CAC block implements chromatic aberration correction. Expose it to userspace using the extensible parameters format. This was tested on the i.MX8MP platform, but based on available documentation it is also present in the RK3399 variant (V10). Thus presumably also in later versions, so no feature flag is introduced.

Barnabás Pőcze committed 6 months ago

Commit 27caa941 parent c4c01c43 files · +187 −3Browse files

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include/uapi/linux/rkisp1-config.h+106−1
@@ -967,6 +967,92 @@ struct rkisp1_cif_isp_wdr_config { · 966 unmodified lines
967967 __u8 use_iref;
968968 };
969969
970+/*
971+ * enum rkisp1_cif_isp_cac_h_clip_mode - horizontal clipping mode
972+ *
973+ * @RKISP1_CIF_ISP_CAC_H_CLIP_MODE_4PX: +/- 4 pixels
974+ * @RKISP1_CIF_ISP_CAC_H_CLIP_MODE_4_5PX: +/- 4/5 pixels depending on bayer position
975+ */
976+enum rkisp1_cif_isp_cac_h_clip_mode {
977+ RKISP1_CIF_ISP_CAC_H_CLIP_MODE_4PX = 0,
978+ RKISP1_CIF_ISP_CAC_H_CLIP_MODE_4_5PX = 1,
979+};
980+
981+/**
982+ * enum rkisp1_cif_isp_cac_v_clip_mode - vertical clipping mode
983+ *
984+ * @RKISP1_CIF_ISP_CAC_V_CLIP_MODE_2PX: +/- 2 pixels
985+ * @RKISP1_CIF_ISP_CAC_V_CLIP_MODE_3PX: +/- 3 pixels
986+ * @RKISP1_CIF_ISP_CAC_V_CLIP_MODE_3_4PX: +/- 3/4 pixels depending on bayer position
987+ */
988+enum rkisp1_cif_isp_cac_v_clip_mode {
989+ RKISP1_CIF_ISP_CAC_V_CLIP_MODE_2PX = 0,
990+ RKISP1_CIF_ISP_CAC_V_CLIP_MODE_3PX = 1,
991+ RKISP1_CIF_ISP_CAC_V_CLIP_MODE_3_4PX = 2,
992+};
993+
994+/**
995+ * struct rkisp1_cif_isp_cac_config - chromatic aberration correction configuration
996+ *
997+ * The correction is carried out by shifting the red and blue pixels relative
998+ * to the green ones, depending on the distance from the optical center:
999+ *
1000+ * @h_count_start: horizontal coordinate of the optical center (13-bit unsigned integer; [1,8191])
1001+ * @v_count_start: vertical coordinate of the optical center (13-bit unsigned integer; [1,8191])
1002+ *
1003+ * For each pixel, the x/y distances from the optical center are calculated and
1004+ * then transformed into the [0,255] range based on the following formula:
1005+ *
1006+ * (((d << 4) >> ns) * nf) >> 5
1007+ *
1008+ * where `d` is the distance, `ns` and `nf` are the normalization parameters:
1009+ *
1010+ * @x_nf: horizontal normalization scale parameter (5-bit unsigned integer; [0,31])
1011+ * @x_ns: horizontal normalization shift parameter (4-bit unsigned integer; [0,15])
1012+ *
1013+ * @y_nf: vertical normalization scale parameter (5-bit unsigned integer; [0,31])
1014+ * @y_ns: vertical normalization shift parameter (4-bit unsigned integer; [0,15])
1015+ *
1016+ * These parameters should be chosen based on the image resolution, the position
1017+ * of the optical center, and the shape of pixels, so that no normalized distance
1018+ * is larger than 255. If the pixels have square shape, the two sets of parameters
1019+ * should be equal.
1020+ *
1021+ * The actual amount of correction is calculated with a third degree polynomial:
1022+ *
1023+ * c[0] * r + c[1] * r^2 + c[2] * r^3
1024+ *
1025+ * where `c` is the set of coefficients for the given color, and `r` is distance:
1026+ *
1027+ * @red: red coefficients (5.4 two's complement; [-16,15.9375])
1028+ * @blue: blue coefficients (5.4 two's complement; [-16,15.9375])
1029+ *
1030+ * Finally, the amount is clipped as requested:
1031+ *
1032+ * @h_clip_mode: maximum horizontal shift (from enum rkisp1_cif_isp_cac_h_clip_mode)
1033+ * @v_clip_mode: maximum vertical shift (from enum rkisp1_cif_isp_cac_v_clip_mode)
1034+ *
1035+ * A positive result will shift away from the optical center, while a negative
1036+ * one will shift towards the optical center. In the latter case, the pixel
1037+ * values at the edges are duplicated.
1038+ */
1039+struct rkisp1_cif_isp_cac_config {
1040+ __u8 h_clip_mode;
1041+ __u8 v_clip_mode;
1042+
1043+ __u16 h_count_start;
1044+ __u16 v_count_start;
1045+
1046+ __u16 red[3];
1047+ __u16 blue[3];
1048+
1049+ __u8 x_nf;
1050+ __u8 x_ns;
1051+
1052+ __u8 y_nf;
1053+ __u8 y_ns;
1054+};
1055+
9701056 /*---------- PART2: Measurement Statistics ------------*/
9711057
9721058 /**
@@ -1138,6 +1224,7 @@ struct rkisp1_stat_buffer { · 165 unmodified lines
11381224 * @RKISP1_EXT_PARAMS_BLOCK_TYPE_COMPAND_EXPAND: Companding expand curve
11391225 * @RKISP1_EXT_PARAMS_BLOCK_TYPE_COMPAND_COMPRESS: Companding compress curve
11401226 * @RKISP1_EXT_PARAMS_BLOCK_TYPE_WDR: Wide dynamic range
1227+ * @RKISP1_EXT_PARAMS_BLOCK_TYPE_CAC: Chromatic aberration correction
11411228 */
11421229 enum rkisp1_ext_params_block_type {
11431230 RKISP1_EXT_PARAMS_BLOCK_TYPE_BLS,
@@ -1161,6 +1248,7 @@ enum rkisp1_ext_params_block_type { · 17 unmodified lines
11611248 RKISP1_EXT_PARAMS_BLOCK_TYPE_COMPAND_EXPAND,
11621249 RKISP1_EXT_PARAMS_BLOCK_TYPE_COMPAND_COMPRESS,
11631250 RKISP1_EXT_PARAMS_BLOCK_TYPE_WDR,
1251+ RKISP1_EXT_PARAMS_BLOCK_TYPE_CAC,
11641252 };
11651253
11661254 /* For backward compatibility */
@@ -1507,6 +1595,22 @@ struct rkisp1_ext_params_wdr_config { · 340 unmodified lines
15071595 struct rkisp1_cif_isp_wdr_config config;
15081596 } __attribute__((aligned(8)));
15091597
1598+/**
1599+ * struct rkisp1_ext_params_cac_config - RkISP1 extensible params CAC config
1600+ *
1601+ * RkISP1 extensible parameters CAC block.
1602+ * Identified by :c:type:`RKISP1_EXT_PARAMS_BLOCK_TYPE_CAC`.
1603+ *
1604+ * @header: The RkISP1 extensible parameters header, see
1605+ * :c:type:`rkisp1_ext_params_block_header`
1606+ * @config: CAC configuration, see
1607+ * :c:type:`rkisp1_cif_isp_cac_config`
1608+ */
1609+struct rkisp1_ext_params_cac_config {
1610+ struct rkisp1_ext_params_block_header header;
1611+ struct rkisp1_cif_isp_cac_config config;
1612+} __attribute__((aligned(8)));
1613+
15101614 /*
15111615 * The rkisp1_ext_params_compand_curve_config structure is counted twice as it
15121616 * is used for both the COMPAND_EXPAND and COMPAND_COMPRESS block types.
@@ -1532,7 +1636,8 @@ struct rkisp1_ext_params_wdr_config { · 19 unmodified lines
15321636 sizeof(struct rkisp1_ext_params_compand_bls_config) +\
15331637 sizeof(struct rkisp1_ext_params_compand_curve_config) +\
15341638 sizeof(struct rkisp1_ext_params_compand_curve_config) +\
1535− sizeof(struct rkisp1_ext_params_wdr_config))
1639+ sizeof(struct rkisp1_ext_params_wdr_config) +\
1640+ sizeof(struct rkisp1_ext_params_cac_config))
15361641
15371642 /**
15381643 * enum rkisp1_ext_param_buffer_version - RkISP1 extensible parameters version