media: verisilicon: Add film grain feature to AV1 driver

Film grain feature add "old style" grain noise on decoded streams.
Grain noise is applied after decoding by the postprocessor.
The level of grain is based on gaussian sequence.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/media/platform/verisilicon/Makefile

@@ -19,6 +19,7 @@ hantro-vpu-y += \
 		rockchip_vpu2_hw_mpeg2_dec.o \
 		rockchip_vpu2_hw_vp8_dec.o \
 		rockchip_vpu981_hw_av1_dec.o \
+		rockchip_av1_filmgrain.o \
 		rockchip_av1_entropymode.o \
 		hantro_jpeg.o \
 		hantro_h264.o \

drivers/media/platform/verisilicon/hantro_hw.h

@@ -16,6 +16,7 @@
 #include <media/videobuf2-core.h>
 
 #include "rockchip_av1_entropymode.h"
+#include "rockchip_av1_filmgrain.h"
 
 #define DEC_8190_ALIGN_MASK	0x07U
 
@@ -288,6 +289,7 @@ struct hantro_av1_frame_ref {
  * @global_model:	global model buffer
  * @tile_info:		tile info buffer
  * @segment:		segmentation info buffer
+ * @film_grain:		film grain buffer
  * @prob_tbl:		probability table
  * @prob_tbl_out:	probability table output
  * @tile_buf:		tile buffer
@@ -312,6 +314,7 @@ struct hantro_av1_dec_hw_ctx {
 	struct hantro_aux_buf global_model;
 	struct hantro_aux_buf tile_info;
 	struct hantro_aux_buf segment;
+	struct hantro_aux_buf film_grain;
 	struct hantro_aux_buf prob_tbl;
 	struct hantro_aux_buf prob_tbl_out;
 	struct hantro_aux_buf tile_buf;

drivers/media/platform/verisilicon/rockchip_av1_filmgrain.c

+// SPDX-License-Identifier: GPL-2.0-only or Apache-2.0
+
+#include "rockchip_av1_filmgrain.h"
+
+static const s32 gaussian_sequence[2048] = {
+	56, 568, -180, 172, 124, -84, 172, -64, -900, 24, 820,
+	224, 1248, 996, 272, -8, -916, -388, -732, -104, -188, 800,
+	112, -652, -320, -376, 140, -252, 492, -168, 44, -788, 588,
+	-584, 500, -228, 12, 680, 272, -476, 972, -100, 652, 368,
+	432, -196, -720, -192, 1000, -332, 652, -136, -552, -604, -4,
+	192, -220, -136, 1000, -52, 372, -96, -624, 124, -24, 396,
+	540, -12, -104, 640, 464, 244, -208, -84, 368, -528, -740,
+	248, -968, -848, 608, 376, -60, -292, -40, -156, 252, -292,
+	248, 224, -280, 400, -244, 244, -60, 76, -80, 212, 532,
+	340, 128, -36, 824, -352, -60, -264, -96, -612, 416, -704,
+	220, -204, 640, -160, 1220, -408, 900, 336, 20, -336, -96,
+	-792, 304, 48, -28, -1232, -1172, -448, 104, -292, -520, 244,
+	60, -948, 0, -708, 268, 108, 356, -548, 488, -344, -136,
+	488, -196, -224, 656, -236, -1128, 60, 4, 140, 276, -676,
+	-376, 168, -108, 464, 8, 564, 64, 240, 308, -300, -400,
+	-456, -136, 56, 120, -408, -116, 436, 504, -232, 328, 844,
+	-164, -84, 784, -168, 232, -224, 348, -376, 128, 568, 96,
+	-1244, -288, 276, 848, 832, -360, 656, 464, -384, -332, -356,
+	728, -388, 160, -192, 468, 296, 224, 140, -776, -100, 280,
+	4, 196, 44, -36, -648, 932, 16, 1428, 28, 528, 808,
+	772, 20, 268, 88, -332, -284, 124, -384, -448, 208, -228,
+	-1044, -328, 660, 380, -148, -300, 588, 240, 540, 28, 136,
+	-88, -436, 256, 296, -1000, 1400, 0, -48, 1056, -136, 264,
+	-528, -1108, 632, -484, -592, -344, 796, 124, -668, -768, 388,
+	1296, -232, -188, -200, -288, -4, 308, 100, -168, 256, -500,
+	204, -508, 648, -136, 372, -272, -120, -1004, -552, -548, -384,
+	548, -296, 428, -108, -8, -912, -324, -224, -88, -112, -220,
+	-100, 996, -796, 548, 360, -216, 180, 428, -200, -212, 148,
+	96, 148, 284, 216, -412, -320, 120, -300, -384, -604, -572,
+	-332, -8, -180, -176, 696, 116, -88, 628, 76, 44, -516,
+	240, -208, -40, 100, -592, 344, -308, -452, -228, 20, 916,
+	-1752, -136, -340, -804, 140, 40, 512, 340, 248, 184, -492,
+	896, -156, 932, -628, 328, -688, -448, -616, -752, -100, 560,
+	-1020, 180, -800, -64, 76, 576, 1068, 396, 660, 552, -108,
+	-28, 320, -628, 312, -92, -92, -472, 268, 16, 560, 516,
+	-672, -52, 492, -100, 260, 384, 284, 292, 304, -148, 88,
+	-152, 1012, 1064, -228, 164, -376, -684, 592, -392, 156, 196,
+	-524, -64, -884, 160, -176, 636, 648, 404, -396, -436, 864,
+	424, -728, 988, -604, 904, -592, 296, -224, 536, -176, -920,
+	436, -48, 1176, -884, 416, -776, -824, -884, 524, -548, -564,
+	-68, -164, -96, 692, 364, -692, -1012, -68, 260, -480, 876,
+	-1116, 452, -332, -352, 892, -1088, 1220, -676, 12, -292, 244,
+	496, 372, -32, 280, 200, 112, -440, -96, 24, -644, -184,
+	56, -432, 224, -980, 272, -260, 144, -436, 420, 356, 364,
+	-528, 76, 172, -744, -368, 404, -752, -416, 684, -688, 72,
+	540, 416, 92, 444, 480, -72, -1416, 164, -1172, -68, 24,
+	424, 264, 1040, 128, -912, -524, -356, 64, 876, -12, 4,
+	-88, 532, 272, -524, 320, 276, -508, 940, 24, -400, -120,
+	756, 60, 236, -412, 100, 376, -484, 400, -100, -740, -108,
+	-260, 328, -268, 224, -200, -416, 184, -604, -564, -20, 296,
+	60, 892, -888, 60, 164, 68, -760, 216, -296, 904, -336,
+	-28, 404, -356, -568, -208, -1480, -512, 296, 328, -360, -164,
+	-1560, -776, 1156, -428, 164, -504, -112, 120, -216, -148, -264,
+	308, 32, 64, -72, 72, 116, 176, -64, -272, 460, -536,
+	-784, -280, 348, 108, -752, -132, 524, -540, -776, 116, -296,
+	-1196, -288, -560, 1040, -472, 116, -848, -1116, 116, 636, 696,
+	284, -176, 1016, 204, -864, -648, -248, 356, 972, -584, -204,
+	264, 880, 528, -24, -184, 116, 448, -144, 828, 524, 212,
+	-212, 52, 12, 200, 268, -488, -404, -880, 824, -672, -40,
+	908, -248, 500, 716, -576, 492, -576, 16, 720, -108, 384,
+	124, 344, 280, 576, -500, 252, 104, -308, 196, -188, -8,
+	1268, 296, 1032, -1196, 436, 316, 372, -432, -200, -660, 704,
+	-224, 596, -132, 268, 32, -452, 884, 104, -1008, 424, -1348,
+	-280, 4, -1168, 368, 476, 696, 300, -8, 24, 180, -592,
+	-196, 388, 304, 500, 724, -160, 244, -84, 272, -256, -420,
+	320, 208, -144, -156, 156, 364, 452, 28, 540, 316, 220,
+	-644, -248, 464, 72, 360, 32, -388, 496, -680, -48, 208,
+	-116, -408, 60, -604, -392, 548, -840, 784, -460, 656, -544,
+	-388, -264, 908, -800, -628, -612, -568, 572, -220, 164, 288,
+	-16, -308, 308, -112, -636, -760, 280, -668, 432, 364, 240,
+	-196, 604, 340, 384, 196, 592, -44, -500, 432, -580, -132,
+	636, -76, 392, 4, -412, 540, 508, 328, -356, -36, 16,
+	-220, -64, -248, -60, 24, -192, 368, 1040, 92, -24, -1044,
+	-32, 40, 104, 148, 192, -136, -520, 56, -816, -224, 732,
+	392, 356, 212, -80, -424, -1008, -324, 588, -1496, 576, 460,
+	-816, -848, 56, -580, -92, -1372, -112, -496, 200, 364, 52,
+	-140, 48, -48, -60, 84, 72, 40, 132, -356, -268, -104,
+	-284, -404, 732, -520, 164, -304, -540, 120, 328, -76, -460,
+	756, 388, 588, 236, -436, -72, -176, -404, -316, -148, 716,
+	-604, 404, -72, -88, -888, -68, 944, 88, -220, -344, 960,
+	472, 460, -232, 704, 120, 832, -228, 692, -508, 132, -476,
+	844, -748, -364, -44, 1116, -1104, -1056, 76, 428, 552, -692,
+	60, 356, 96, -384, -188, -612, -576, 736, 508, 892, 352,
+	-1132, 504, -24, -352, 324, 332, -600, -312, 292, 508, -144,
+	-8, 484, 48, 284, -260, -240, 256, -100, -292, -204, -44,
+	472, -204, 908, -188, -1000, -256, 92, 1164, -392, 564, 356,
+	652, -28, -884, 256, 484, -192, 760, -176, 376, -524, -452,
+	-436, 860, -736, 212, 124, 504, -476, 468, 76, -472, 552,
+	-692, -944, -620, 740, -240, 400, 132, 20, 192, -196, 264,
+	-668, -1012, -60, 296, -316, -828, 76, -156, 284, -768, -448,
+	-832, 148, 248, 652, 616, 1236, 288, -328, -400, -124, 588,
+	220, 520, -696, 1032, 768, -740, -92, -272, 296, 448, -464,
+	412, -200, 392, 440, -200, 264, -152, -260, 320, 1032, 216,
+	320, -8, -64, 156, -1016, 1084, 1172, 536, 484, -432, 132,
+	372, -52, -256, 84, 116, -352, 48, 116, 304, -384, 412,
+	924, -300, 528, 628, 180, 648, 44, -980, -220, 1320, 48,
+	332, 748, 524, -268, -720, 540, -276, 564, -344, -208, -196,
+	436, 896, 88, -392, 132, 80, -964, -288, 568, 56, -48,
+	-456, 888, 8, 552, -156, -292, 948, 288, 128, -716, -292,
+	1192, -152, 876, 352, -600, -260, -812, -468, -28, -120, -32,
+	-44, 1284, 496, 192, 464, 312, -76, -516, -380, -456, -1012,
+	-48, 308, -156, 36, 492, -156, -808, 188, 1652, 68, -120,
+	-116, 316, 160, -140, 352, 808, -416, 592, 316, -480, 56,
+	528, -204, -568, 372, -232, 752, -344, 744, -4, 324, -416,
+	-600, 768, 268, -248, -88, -132, -420, -432, 80, -288, 404,
+	-316, -1216, -588, 520, -108, 92, -320, 368, -480, -216, -92,
+	1688, -300, 180, 1020, -176, 820, -68, -228, -260, 436, -904,
+	20, 40, -508, 440, -736, 312, 332, 204, 760, -372, 728,
+	96, -20, -632, -520, -560, 336, 1076, -64, -532, 776, 584,
+	192, 396, -728, -520, 276, -188, 80, -52, -612, -252, -48,
+	648, 212, -688, 228, -52, -260, 428, -412, -272, -404, 180,
+	816, -796, 48, 152, 484, -88, -216, 988, 696, 188, -528,
+	648, -116, -180, 316, 476, 12, -564, 96, 476, -252, -364,
+	-376, -392, 556, -256, -576, 260, -352, 120, -16, -136, -260,
+	-492, 72, 556, 660, 580, 616, 772, 436, 424, -32, -324,
+	-1268, 416, -324, -80, 920, 160, 228, 724, 32, -516, 64,
+	384, 68, -128, 136, 240, 248, -204, -68, 252, -932, -120,
+	-480, -628, -84, 192, 852, -404, -288, -132, 204, 100, 168,
+	-68, -196, -868, 460, 1080, 380, -80, 244, 0, 484, -888,
+	64, 184, 352, 600, 460, 164, 604, -196, 320, -64, 588,
+	-184, 228, 12, 372, 48, -848, -344, 224, 208, -200, 484,
+	128, -20, 272, -468, -840, 384, 256, -720, -520, -464, -580,
+	112, -120, 644, -356, -208, -608, -528, 704, 560, -424, 392,
+	828, 40, 84, 200, -152, 0, -144, 584, 280, -120, 80,
+	-556, -972, -196, -472, 724, 80, 168, -32, 88, 160, -688,
+	0, 160, 356, 372, -776, 740, -128, 676, -248, -480, 4,
+	-364, 96, 544, 232, -1032, 956, 236, 356, 20, -40, 300,
+	24, -676, -596, 132, 1120, -104, 532, -1096, 568, 648, 444,
+	508, 380, 188, -376, -604, 1488, 424, 24, 756, -220, -192,
+	716, 120, 920, 688, 168, 44, -460, 568, 284, 1144, 1160,
+	600, 424, 888, 656, -356, -320, 220, 316, -176, -724, -188,
+	-816, -628, -348, -228, -380, 1012, -452, -660, 736, 928, 404,
+	-696, -72, -268, -892, 128, 184, -344, -780, 360, 336, 400,
+	344, 428, 548, -112, 136, -228, -216, -820, -516, 340, 92,
+	-136, 116, -300, 376, -244, 100, -316, -520, -284, -12, 824,
+	164, -548, -180, -128, 116, -924, -828, 268, -368, -580, 620,
+	192, 160, 0, -1676, 1068, 424, -56, -360, 468, -156, 720,
+	288, -528, 556, -364, 548, -148, 504, 316, 152, -648, -620,
+	-684, -24, -376, -384, -108, -920, -1032, 768, 180, -264, -508,
+	-1268, -260, -60, 300, -240, 988, 724, -376, -576, -212, -736,
+	556, 192, 1092, -620, -880, 376, -56, -4, -216, -32, 836,
+	268, 396, 1332, 864, -600, 100, 56, -412, -92, 356, 180,
+	884, -468, -436, 292, -388, -804, -704, -840, 368, -348, 140,
+	-724, 1536, 940, 372, 112, -372, 436, -480, 1136, 296, -32,
+	-228, 132, -48, -220, 868, -1016, -60, -1044, -464, 328, 916,
+	244, 12, -736, -296, 360, 468, -376, -108, -92, 788, 368,
+	-56, 544, 400, -672, -420, 728, 16, 320, 44, -284, -380,
+	-796, 488, 132, 204, -596, -372, 88, -152, -908, -636, -572,
+	-624, -116, -692, -200, -56, 276, -88, 484, -324, 948, 864,
+	1000, -456, -184, -276, 292, -296, 156, 676, 320, 160, 908,
+	-84, -1236, -288, -116, 260, -372, -644, 732, -756, -96, 84,
+	344, -520, 348, -688, 240, -84, 216, -1044, -136, -676, -396,
+	-1500, 960, -40, 176, 168, 1516, 420, -504, -344, -364, -360,
+	1216, -940, -380, -212, 252, -660, -708, 484, -444, -152, 928,
+	-120, 1112, 476, -260, 560, -148, -344, 108, -196, 228, -288,
+	504, 560, -328, -88, 288, -1008, 460, -228, 468, -836, -196,
+	76, 388, 232, 412, -1168, -716, -644, 756, -172, -356, -504,
+	116, 432, 528, 48, 476, -168, -608, 448, 160, -532, -272,
+	28, -676, -12, 828, 980, 456, 520, 104, -104, 256, -344,
+	-4, -28, -368, -52, -524, -572, -556, -200, 768, 1124, -208,
+	-512, 176, 232, 248, -148, -888, 604, -600, -304, 804, -156,
+	-212, 488, -192, -804, -256, 368, -360, -916, -328, 228, -240,
+	-448, -472, 856, -556, -364, 572, -12, -156, -368, -340, 432,
+	252, -752, -152, 288, 268, -580, -848, -592, 108, -76, 244,
+	312, -716, 592, -80, 436, 360, 4, -248, 160, 516, 584,
+	732, 44, -468, -280, -292, -156, -588, 28, 308, 912, 24,
+	124, 156, 180, -252, 944, -924, -772, -520, -428, -624, 300,
+	-212, -1144, 32, -724, 800, -1128, -212, -1288, -848, 180, -416,
+	440, 192, -576, -792, -76, -1080, 80, -532, -352, -132, 380,
+	-820, 148, 1112, 128, 164, 456, 700, -924, 144, -668, -384,
+	648, -832, 508, 552, -52, -100, -656, 208, -568, 748, -88,
+	680, 232, 300, 192, -408, -1012, -152, -252, -268, 272, -876,
+	-664, -648, -332, -136, 16, 12, 1152, -28, 332, -536, 320,
+	-672, -460, -316, 532, -260, 228, -40, 1052, -816, 180, 88,
+	-496, -556, -672, -368, 428, 92, 356, 404, -408, 252, 196,
+	-176, -556, 792, 268, 32, 372, 40, 96, -332, 328, 120,
+	372, -900, -40, 472, -264, -592, 952, 128, 656, 112, 664,
+	-232, 420, 4, -344, -464, 556, 244, -416, -32, 252, 0,
+	-412, 188, -696, 508, -476, 324, -1096, 656, -312, 560, 264,
+	-136, 304, 160, -64, -580, 248, 336, -720, 560, -348, -288,
+	-276, -196, -500, 852, -544, -236, -1128, -992, -776, 116, 56,
+	52, 860, 884, 212, -12, 168, 1020, 512, -552, 924, -148,
+	716, 188, 164, -340, -520, -184, 880, -152, -680, -208, -1156,
+	-300, -528, -472, 364, 100, -744, -1056, -32, 540, 280, 144,
+	-676, -32, -232, -280, -224, 96, 568, -76, 172, 148, 148,
+	104, 32, -296, -32, 788, -80, 32, -16, 280, 288, 944,
+	428, -484
+};
+
+static inline s32 clamp(s32 value, s32 low, s32 high)
+{
+	return value < low ? low : (value > high ? high : value);
+}
+
+static inline s32 round_power_of_two(const s32 val, s32 n)
+{
+	const s32 a = (s32)1 << (n - 1);
+
+	return (val + a) >> n;
+}
+
+static void rockchip_av1_init_random_generator(u8 luma_num, u16 seed,
+					       u16 *random_register)
+{
+	u16 random_reg = seed;
+
+	random_reg ^= ((luma_num * 37 + 178) & 255) << 8;
+	random_reg ^= ((luma_num * 173 + 105) & 255);
+	*random_register = random_reg;
+}
+
+static inline void rockchip_av1_update_random_register(u16 *random_register)
+{
+	u16 bit;
+	u16 random_reg = *random_register;
+
+	bit = ((random_reg >> 0) ^ (random_reg >> 1) ^ (random_reg >> 3) ^
+	       (random_reg >> 12)) & 1;
+	*random_register = (random_reg >> 1) | (bit << 15);
+}
+
+static inline s32 rockchip_av1_get_random_number(u16 random_register)
+{
+	return (random_register >> 5) & ((1 << 11) - 1);
+}
+
+void rockchip_av1_generate_luma_grain_block(s32 (*luma_grain_block)[73][82],
+					    s32 bitdepth,
+					    u8 num_y_points,
+					    s32 grain_scale_shift,
+					    s32 ar_coeff_lag,
+					    s32 (*ar_coeffs_y)[24],
+					    s32 ar_coeff_shift,
+					    s32 grain_min,
+					    s32 grain_max,
+					    u16 random_seed)
+{
+	s32 gauss_sec_shift = 12 - bitdepth + grain_scale_shift;
+	u16 grain_random_register = random_seed;
+	s32 i, j;
+
+	for (i = 0; i < 73; i++) {
+		for (j = 0; j < 82; j++) {
+			if (num_y_points > 0) {
+				rockchip_av1_update_random_register
+				    (&grain_random_register);
+				(*luma_grain_block)[i][j] =
+				    round_power_of_two(gaussian_sequence
+					     [rockchip_av1_get_random_number
+					      (grain_random_register)],
+					     gauss_sec_shift);
+			} else {
+				(*luma_grain_block)[i][j] = 0;
+			}
+		}
+	}
+
+	for (i = 3; i < 73; i++)
+		for (j = 3; j < 82 - 3; j++) {
+			s32 pos = 0;
+			s32 wsum = 0;
+			s32 deltarow, deltacol;
+
+			for (deltarow = -ar_coeff_lag; deltarow <= 0;
+			     deltarow++) {
+				for (deltacol = -ar_coeff_lag;
+				     deltacol <= ar_coeff_lag; deltacol++) {
+					if (deltarow == 0 && deltacol == 0)
+						break;
+					wsum = wsum + (*ar_coeffs_y)[pos] *
+					    (*luma_grain_block)[i + deltarow][j + deltacol];
+					++pos;
+				}
+			}
+			(*luma_grain_block)[i][j] =
+				clamp((*luma_grain_block)[i][j] +
+				      round_power_of_two(wsum, ar_coeff_shift),
+				      grain_min, grain_max);
+		}
+}
+
+// Calculate chroma grain noise once per frame
+void rockchip_av1_generate_chroma_grain_block(s32 (*luma_grain_block)[73][82],
+					      s32 (*cb_grain_block)[38][44],
+					      s32 (*cr_grain_block)[38][44],
+					      s32 bitdepth,
+					      u8 num_y_points,
+					      u8 num_cb_points,
+					      u8 num_cr_points,
+					      s32 grain_scale_shift,
+					      s32 ar_coeff_lag,
+					      s32 (*ar_coeffs_cb)[25],
+					      s32 (*ar_coeffs_cr)[25],
+					      s32 ar_coeff_shift,
+					      s32 grain_min,
+					      s32 grain_max,
+					      u8 chroma_scaling_from_luma,
+					      u16 random_seed)
+{
+	s32 gauss_sec_shift = 12 - bitdepth + grain_scale_shift;
+	u16 grain_random_register = 0;
+	s32 i, j;
+
+	rockchip_av1_init_random_generator(7, random_seed,
+					   &grain_random_register);
+	for (i = 0; i < 38; i++) {
+		for (j = 0; j < 44; j++) {
+			if (num_cb_points || chroma_scaling_from_luma) {
+				rockchip_av1_update_random_register
+				    (&grain_random_register);
+				(*cb_grain_block)[i][j] =
+				    round_power_of_two(gaussian_sequence
+					     [rockchip_av1_get_random_number
+					      (grain_random_register)],
+					     gauss_sec_shift);
+			} else {
+				(*cb_grain_block)[i][j] = 0;
+			}
+		}
+	}
+
+	rockchip_av1_init_random_generator(11, random_seed,
+					   &grain_random_register);
+	for (i = 0; i < 38; i++) {
+		for (j = 0; j < 44; j++) {
+			if (num_cr_points || chroma_scaling_from_luma) {
+				rockchip_av1_update_random_register
+				    (&grain_random_register);
+				(*cr_grain_block)[i][j] =
+				    round_power_of_two(gaussian_sequence
+					     [rockchip_av1_get_random_number
+					      (grain_random_register)],
+					     gauss_sec_shift);
+			} else {
+				(*cr_grain_block)[i][j] = 0;
+			}
+		}
+	}
+
+	for (i = 3; i < 38; i++) {
+		for (j = 3; j < 44 - 3; j++) {
+			s32 wsum_cb = 0;
+			s32 wsum_cr = 0;
+			s32 pos = 0;
+			s32 deltarow, deltacol;
+
+			for (deltarow = -ar_coeff_lag; deltarow <= 0;
+			     deltarow++) {
+				for (deltacol = -ar_coeff_lag;
+				     deltacol <= ar_coeff_lag; deltacol++) {
+					if (deltarow == 0 && deltacol == 0)
+						break;
+					wsum_cb = wsum_cb + (*ar_coeffs_cb)[pos] *
+					    (*cb_grain_block)[i + deltarow][j + deltacol];
+					wsum_cr =
+					    wsum_cr +
+					    (*ar_coeffs_cr)[pos] *
+					    (*cr_grain_block)[i + deltarow][j + deltacol];
+					++pos;
+				}
+			}
+
+			if (num_y_points > 0) {
+				s32 av_luma = 0;
+				s32 luma_coord_y = (i << 1) - 3;
+				s32 luma_coord_x = (j << 1) - 3;
+
+				av_luma +=
+				    (*luma_grain_block)[luma_coord_y][luma_coord_x];
+				av_luma +=
+				    (*luma_grain_block)[luma_coord_y][luma_coord_x + 1];
+				av_luma +=
+				    (*luma_grain_block)[luma_coord_y + 1][luma_coord_x];
+				av_luma +=
+				    (*luma_grain_block)[(luma_coord_y + 1)][luma_coord_x + 1];
+				av_luma = round_power_of_two(av_luma, 2);
+
+				wsum_cb = wsum_cb + (*ar_coeffs_cb)[pos] * av_luma;
+				wsum_cr = wsum_cr + (*ar_coeffs_cr)[pos] * av_luma;
+			}
+
+			if (num_cb_points || chroma_scaling_from_luma) {
+				(*cb_grain_block)[i][j] =
+				    clamp((*cb_grain_block)[i][j] +
+					  round_power_of_two(wsum_cb, ar_coeff_shift),
+					  grain_min, grain_max);
+			}
+			if (num_cr_points || chroma_scaling_from_luma) {
+				(*cr_grain_block)[i][j] =
+				    clamp((*cr_grain_block)[i][j] +
+					  round_power_of_two(wsum_cr, ar_coeff_shift),
+					  grain_min, grain_max);
+			}
+		}
+	}
+}

drivers/media/platform/verisilicon/rockchip_av1_filmgrain.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ROCKCHIP_AV1_FILMGRAIN_H_
+#define _ROCKCHIP_AV1_FILMGRAIN_H_
+
+#include <linux/types.h>
+
+void rockchip_av1_generate_luma_grain_block(s32 (*luma_grain_block)[73][82],
+					    s32 bitdepth,
+					    u8 num_y_points,
+					    s32 grain_scale_shift,
+					    s32 ar_coeff_lag,
+					    s32 (*ar_coeffs_y)[24],
+					    s32 ar_coeff_shift,
+					    s32 grain_min,
+					    s32 grain_max,
+					    u16 random_seed);
+
+void rockchip_av1_generate_chroma_grain_block(s32 (*luma_grain_block)[73][82],
+					      s32 (*cb_grain_block)[38][44],
+					      s32 (*cr_grain_block)[38][44],
+					      s32 bitdepth,
+					      u8 num_y_points,
+					      u8 num_cb_points,
+					      u8 num_cr_points,
+					      s32 grain_scale_shift,
+					      s32 ar_coeff_lag,
+					      s32 (*ar_coeffs_cb)[25],
+					      s32 (*ar_coeffs_cr)[25],
+					      s32 ar_coeff_shift,
+					      s32 grain_min,
+					      s32 grain_max,
+					      u8 chroma_scaling_from_luma,
+					      u16 random_seed);
+
+#endif

drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c

@@ -334,6 +334,12 @@ void rockchip_vpu981_av1_dec_exit(struct hantro_ctx *ctx)
 				  av1_dec->tile_info.dma);
 	av1_dec->tile_info.cpu = NULL;
 
+	if (av1_dec->film_grain.cpu)
+		dma_free_coherent(vpu->dev, av1_dec->film_grain.size,
+				  av1_dec->film_grain.cpu,
+				  av1_dec->film_grain.dma);
+	av1_dec->film_grain.cpu = NULL;
+
 	if (av1_dec->prob_tbl.cpu)
 		dma_free_coherent(vpu->dev, av1_dec->prob_tbl.size,
 				  av1_dec->prob_tbl.cpu, av1_dec->prob_tbl.dma);
@@ -374,6 +380,14 @@ int rockchip_vpu981_av1_dec_init(struct hantro_ctx *ctx)
 		return -ENOMEM;
 	av1_dec->tile_info.size = AV1_MAX_TILES;
 
+	av1_dec->film_grain.cpu = dma_alloc_coherent(vpu->dev,
+						     ALIGN(sizeof(struct rockchip_av1_film_grain), 2048),
+						     &av1_dec->film_grain.dma,
+						     GFP_KERNEL);
+	if (!av1_dec->film_grain.cpu)
+		return -ENOMEM;
+	av1_dec->film_grain.size = ALIGN(sizeof(struct rockchip_av1_film_grain), 2048);
+
 	av1_dec->prob_tbl.cpu = dma_alloc_coherent(vpu->dev,
 						   ALIGN(sizeof(struct av1cdfs), 2048),
 						   &av1_dec->prob_tbl.dma,
@@ -1178,6 +1192,201 @@ static void rockchip_vpu981_av1_dec_set_prob(struct hantro_ctx *ctx)
 	hantro_write_addr(vpu, AV1_PROP_TABLE, av1_dec->prob_tbl.dma);
 }
 
+static void
+rockchip_vpu981_av1_dec_init_scaling_function(const u8 *values, const u8 *scaling,
+					      u8 num_points, u8 *scaling_lut)
+{
+	int i, point;
+
+	if (num_points == 0) {
+		memset(scaling_lut, 0, 256);
+		return;
+	}
+
+	for (point = 0; point < num_points - 1; point++) {
+		int x;
+		s32 delta_y = scaling[point + 1] - scaling[point];
+		s32 delta_x = values[point + 1] - values[point];
+		s64 delta =
+		    delta_x ? delta_y * ((65536 + (delta_x >> 1)) /
+					 delta_x) : 0;
+
+		for (x = 0; x < delta_x; x++) {
+			scaling_lut[values[point] + x] =
+			    scaling[point] +
+			    (s32)((x * delta + 32768) >> 16);
+		}
+	}
+
+	for (i = values[num_points - 1]; i < 256; i++)
+		scaling_lut[i] = scaling[num_points - 1];
+}
+
+static void rockchip_vpu981_av1_dec_set_fgs(struct hantro_ctx *ctx)
+{
+	struct hantro_av1_dec_hw_ctx *av1_dec = &ctx->av1_dec;
+	struct hantro_av1_dec_ctrls *ctrls = &av1_dec->ctrls;
+	const struct v4l2_ctrl_av1_film_grain *film_grain = ctrls->film_grain;
+	struct rockchip_av1_film_grain *fgmem = av1_dec->film_grain.cpu;
+	struct hantro_dev *vpu = ctx->dev;
+	bool scaling_from_luma =
+		!!(film_grain->flags & V4L2_AV1_FILM_GRAIN_FLAG_CHROMA_SCALING_FROM_LUMA);
+	s32 (*ar_coeffs_y)[24];
+	s32 (*ar_coeffs_cb)[25];
+	s32 (*ar_coeffs_cr)[25];
+	s32 (*luma_grain_block)[73][82];
+	s32 (*cb_grain_block)[38][44];
+	s32 (*cr_grain_block)[38][44];
+	s32 ar_coeff_lag, ar_coeff_shift;
+	s32 grain_scale_shift, bitdepth;
+	s32 grain_center, grain_min, grain_max;
+	int i, j;
+
+	hantro_reg_write(vpu, &av1_apply_grain, 0);
+
+	if (!(film_grain->flags & V4L2_AV1_FILM_GRAIN_FLAG_APPLY_GRAIN)) {
+		hantro_reg_write(vpu, &av1_num_y_points_b, 0);
+		hantro_reg_write(vpu, &av1_num_cb_points_b, 0);
+		hantro_reg_write(vpu, &av1_num_cr_points_b, 0);
+		hantro_reg_write(vpu, &av1_scaling_shift, 0);
+		hantro_reg_write(vpu, &av1_cb_mult, 0);
+		hantro_reg_write(vpu, &av1_cb_luma_mult, 0);
+		hantro_reg_write(vpu, &av1_cb_offset, 0);
+		hantro_reg_write(vpu, &av1_cr_mult, 0);
+		hantro_reg_write(vpu, &av1_cr_luma_mult, 0);
+		hantro_reg_write(vpu, &av1_cr_offset, 0);
+		hantro_reg_write(vpu, &av1_overlap_flag, 0);
+		hantro_reg_write(vpu, &av1_clip_to_restricted_range, 0);
+		hantro_reg_write(vpu, &av1_chroma_scaling_from_luma, 0);
+		hantro_reg_write(vpu, &av1_random_seed, 0);
+		hantro_write_addr(vpu, AV1_FILM_GRAIN, 0);
+		return;
+	}
+
+	ar_coeffs_y = kzalloc(sizeof(int32_t) * 24, GFP_KERNEL);
+	ar_coeffs_cb = kzalloc(sizeof(int32_t) * 25, GFP_KERNEL);
+	ar_coeffs_cr = kzalloc(sizeof(int32_t) * 25, GFP_KERNEL);
+	luma_grain_block = kzalloc(sizeof(int32_t) * 73 * 82, GFP_KERNEL);
+	cb_grain_block = kzalloc(sizeof(int32_t) * 38 * 44, GFP_KERNEL);
+	cr_grain_block = kzalloc(sizeof(int32_t) * 38 * 44, GFP_KERNEL);
+
+	if (!ar_coeffs_y || !ar_coeffs_cb || !ar_coeffs_cr ||
+	    !luma_grain_block || !cb_grain_block || !cr_grain_block) {
+		pr_warn("Fail allocating memory for film grain parameters\n");
+		goto alloc_fail;
+	}
+
+	hantro_reg_write(vpu, &av1_apply_grain, 1);
+
+	hantro_reg_write(vpu, &av1_num_y_points_b,
+			 film_grain->num_y_points > 0);
+	hantro_reg_write(vpu, &av1_num_cb_points_b,
+			 film_grain->num_cb_points > 0);
+	hantro_reg_write(vpu, &av1_num_cr_points_b,
+			 film_grain->num_cr_points > 0);
+	hantro_reg_write(vpu, &av1_scaling_shift,
+			 film_grain->grain_scaling_minus_8 + 8);
+
+	if (!scaling_from_luma) {
+		hantro_reg_write(vpu, &av1_cb_mult, film_grain->cb_mult - 128);
+		hantro_reg_write(vpu, &av1_cb_luma_mult, film_grain->cb_luma_mult - 128);
+		hantro_reg_write(vpu, &av1_cb_offset, film_grain->cb_offset - 256);
+		hantro_reg_write(vpu, &av1_cr_mult, film_grain->cr_mult - 128);
+		hantro_reg_write(vpu, &av1_cr_luma_mult, film_grain->cr_luma_mult - 128);
+		hantro_reg_write(vpu, &av1_cr_offset, film_grain->cr_offset - 256);
+	} else {
+		hantro_reg_write(vpu, &av1_cb_mult, 0);
+		hantro_reg_write(vpu, &av1_cb_luma_mult, 0);
+		hantro_reg_write(vpu, &av1_cb_offset, 0);
+		hantro_reg_write(vpu, &av1_cr_mult, 0);
+		hantro_reg_write(vpu, &av1_cr_luma_mult, 0);
+		hantro_reg_write(vpu, &av1_cr_offset, 0);
+	}
+
+	hantro_reg_write(vpu, &av1_overlap_flag,
+			 !!(film_grain->flags & V4L2_AV1_FILM_GRAIN_FLAG_OVERLAP));
+	hantro_reg_write(vpu, &av1_clip_to_restricted_range,
+			 !!(film_grain->flags & V4L2_AV1_FILM_GRAIN_FLAG_CLIP_TO_RESTRICTED_RANGE));
+	hantro_reg_write(vpu, &av1_chroma_scaling_from_luma, scaling_from_luma);
+	hantro_reg_write(vpu, &av1_random_seed, film_grain->grain_seed);
+
+	rockchip_vpu981_av1_dec_init_scaling_function(film_grain->point_y_value,
+						      film_grain->point_y_scaling,
+						      film_grain->num_y_points,
+						      fgmem->scaling_lut_y);
+
+	if (film_grain->flags &
+	    V4L2_AV1_FILM_GRAIN_FLAG_CHROMA_SCALING_FROM_LUMA) {
+		memcpy(fgmem->scaling_lut_cb, fgmem->scaling_lut_y,
+		       sizeof(*fgmem->scaling_lut_y) * 256);
+		memcpy(fgmem->scaling_lut_cr, fgmem->scaling_lut_y,
+		       sizeof(*fgmem->scaling_lut_y) * 256);
+	} else {
+		rockchip_vpu981_av1_dec_init_scaling_function
+		    (film_grain->point_cb_value, film_grain->point_cb_scaling,
+		     film_grain->num_cb_points, fgmem->scaling_lut_cb);
+		rockchip_vpu981_av1_dec_init_scaling_function
+		    (film_grain->point_cr_value, film_grain->point_cr_scaling,
+		     film_grain->num_cr_points, fgmem->scaling_lut_cr);
+	}
+
+	for (i = 0; i < V4L2_AV1_AR_COEFFS_SIZE; i++) {
+		if (i < 24)
+			(*ar_coeffs_y)[i] = film_grain->ar_coeffs_y_plus_128[i] - 128;
+		(*ar_coeffs_cb)[i] = film_grain->ar_coeffs_cb_plus_128[i] - 128;
+		(*ar_coeffs_cr)[i] = film_grain->ar_coeffs_cr_plus_128[i] - 128;
+	}
+
+	ar_coeff_lag = film_grain->ar_coeff_lag;
+	ar_coeff_shift = film_grain->ar_coeff_shift_minus_6 + 6;
+	grain_scale_shift = film_grain->grain_scale_shift;
+	bitdepth = ctx->bit_depth;
+	grain_center = 128 << (bitdepth - 8);
+	grain_min = 0 - grain_center;
+	grain_max = (256 << (bitdepth - 8)) - 1 - grain_center;
+
+	rockchip_av1_generate_luma_grain_block(luma_grain_block, bitdepth,
+					       film_grain->num_y_points, grain_scale_shift,
+					       ar_coeff_lag, ar_coeffs_y, ar_coeff_shift,
+					       grain_min, grain_max, film_grain->grain_seed);
+
+	rockchip_av1_generate_chroma_grain_block(luma_grain_block, cb_grain_block,
+						 cr_grain_block, bitdepth,
+						 film_grain->num_y_points,
+						 film_grain->num_cb_points,
+						 film_grain->num_cr_points,
+						 grain_scale_shift, ar_coeff_lag, ar_coeffs_cb,
+						 ar_coeffs_cr, ar_coeff_shift, grain_min,
+						 grain_max,
+						 scaling_from_luma,
+						 film_grain->grain_seed);
+
+	for (i = 0; i < 64; i++) {
+		for (j = 0; j < 64; j++)
+			fgmem->cropped_luma_grain_block[i * 64 + j] =
+				(*luma_grain_block)[i + 9][j + 9];
+	}
+
+	for (i = 0; i < 32; i++) {
+		for (j = 0; j < 32; j++) {
+			fgmem->cropped_chroma_grain_block[i * 64 + 2 * j] =
+				(*cb_grain_block)[i + 6][j + 6];
+			fgmem->cropped_chroma_grain_block[i * 64 + 2 * j + 1] =
+				(*cr_grain_block)[i + 6][j + 6];
+		}
+	}
+
+	hantro_write_addr(vpu, AV1_FILM_GRAIN, av1_dec->film_grain.dma);
+
+alloc_fail:
+	kfree(ar_coeffs_y);
+	kfree(ar_coeffs_cb);
+	kfree(ar_coeffs_cr);
+	kfree(luma_grain_block);
+	kfree(cb_grain_block);
+	kfree(cr_grain_block);
+}
+
 static void rockchip_vpu981_av1_dec_set_cdef(struct hantro_ctx *ctx)
 {
 	struct hantro_av1_dec_hw_ctx *av1_dec = &ctx->av1_dec;
@@ -1915,6 +2124,7 @@ int rockchip_vpu981_av1_dec_run(struct hantro_ctx *ctx)
 	rockchip_vpu981_av1_dec_set_picture_dimensions(ctx);
 	rockchip_vpu981_av1_dec_set_cdef(ctx);
 	rockchip_vpu981_av1_dec_set_lr(ctx);
+	rockchip_vpu981_av1_dec_set_fgs(ctx);
 	rockchip_vpu981_av1_dec_set_prob(ctx);
 
 	hantro_reg_write(vpu, &av1_dec_mode, AV1_DEC_MODE);