diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig
index 02dc1787e953..6ee75c6c820e 100644
--- a/drivers/media/v4l2-core/Kconfig
+++ b/drivers/media/v4l2-core/Kconfig
@@ -52,6 +52,10 @@ config V4L2_JPEG_HELPER
 config V4L2_H264
 	tristate
 
+# Used by drivers that need v4l2-vp9.ko
+config V4L2_VP9
+	tristate
+
 # Used by drivers that need v4l2-mem2mem.ko
 config V4L2_MEM2MEM_DEV
 	tristate
diff --git a/drivers/media/v4l2-core/Makefile b/drivers/media/v4l2-core/Makefile
index 66a78c556c98..83fac5c746f5 100644
--- a/drivers/media/v4l2-core/Makefile
+++ b/drivers/media/v4l2-core/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_VIDEO_TUNER) += tuner.o
 
 obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
 obj-$(CONFIG_V4L2_H264) += v4l2-h264.o
+obj-$(CONFIG_V4L2_VP9) += v4l2-vp9.o
 
 obj-$(CONFIG_V4L2_FLASH_LED_CLASS) += v4l2-flash-led-class.o
 
diff --git a/drivers/media/v4l2-core/v4l2-vp9.c b/drivers/media/v4l2-core/v4l2-vp9.c
new file mode 100644
index 000000000000..b08a9f076bbe
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-vp9.c
@@ -0,0 +1,1850 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * V4L2 VP9 helpers.
+ *
+ * Copyright (C) 2021 Collabora, Ltd.
+ *
+ * Author: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
+ */
+
+#include <linux/module.h>
+
+#include <media/v4l2-vp9.h>
+
+const u8 v4l2_vp9_kf_y_mode_prob[10][10][9] = {
+	{
+		/* above = dc */
+		{ 137,  30,  42, 148, 151, 207,  70,  52,  91 }, /*left = dc  */
+		{  92,  45, 102, 136, 116, 180,  74,  90, 100 }, /*left = v   */
+		{  73,  32,  19, 187, 222, 215,  46,  34, 100 }, /*left = h   */
+		{  91,  30,  32, 116, 121, 186,  93,  86,  94 }, /*left = d45 */
+		{  72,  35,  36, 149,  68, 206,  68,  63, 105 }, /*left = d135*/
+		{  73,  31,  28, 138,  57, 124,  55, 122, 151 }, /*left = d117*/
+		{  67,  23,  21, 140, 126, 197,  40,  37, 171 }, /*left = d153*/
+		{  86,  27,  28, 128, 154, 212,  45,  43,  53 }, /*left = d207*/
+		{  74,  32,  27, 107,  86, 160,  63, 134, 102 }, /*left = d63 */
+		{  59,  67,  44, 140, 161, 202,  78,  67, 119 }, /*left = tm  */
+	}, {  /* above = v */
+		{  63,  36, 126, 146, 123, 158,  60,  90,  96 }, /*left = dc  */
+		{  43,  46, 168, 134, 107, 128,  69, 142,  92 }, /*left = v   */
+		{  44,  29,  68, 159, 201, 177,  50,  57,  77 }, /*left = h   */
+		{  58,  38,  76, 114,  97, 172,  78, 133,  92 }, /*left = d45 */
+		{  46,  41,  76, 140,  63, 184,  69, 112,  57 }, /*left = d135*/
+		{  38,  32,  85, 140,  46, 112,  54, 151, 133 }, /*left = d117*/
+		{  39,  27,  61, 131, 110, 175,  44,  75, 136 }, /*left = d153*/
+		{  52,  30,  74, 113, 130, 175,  51,  64,  58 }, /*left = d207*/
+		{  47,  35,  80, 100,  74, 143,  64, 163,  74 }, /*left = d63 */
+		{  36,  61, 116, 114, 128, 162,  80, 125,  82 }, /*left = tm  */
+	}, {  /* above = h */
+		{  82,  26,  26, 171, 208, 204,  44,  32, 105 }, /*left = dc  */
+		{  55,  44,  68, 166, 179, 192,  57,  57, 108 }, /*left = v   */
+		{  42,  26,  11, 199, 241, 228,  23,  15,  85 }, /*left = h   */
+		{  68,  42,  19, 131, 160, 199,  55,  52,  83 }, /*left = d45 */
+		{  58,  50,  25, 139, 115, 232,  39,  52, 118 }, /*left = d135*/
+		{  50,  35,  33, 153, 104, 162,  64,  59, 131 }, /*left = d117*/
+		{  44,  24,  16, 150, 177, 202,  33,  19, 156 }, /*left = d153*/
+		{  55,  27,  12, 153, 203, 218,  26,  27,  49 }, /*left = d207*/
+		{  53,  49,  21, 110, 116, 168,  59,  80,  76 }, /*left = d63 */
+		{  38,  72,  19, 168, 203, 212,  50,  50, 107 }, /*left = tm  */
+	}, {  /* above = d45 */
+		{ 103,  26,  36, 129, 132, 201,  83,  80,  93 }, /*left = dc  */
+		{  59,  38,  83, 112, 103, 162,  98, 136,  90 }, /*left = v   */
+		{  62,  30,  23, 158, 200, 207,  59,  57,  50 }, /*left = h   */
+		{  67,  30,  29,  84,  86, 191, 102,  91,  59 }, /*left = d45 */
+		{  60,  32,  33, 112,  71, 220,  64,  89, 104 }, /*left = d135*/
+		{  53,  26,  34, 130,  56, 149,  84, 120, 103 }, /*left = d117*/
+		{  53,  21,  23, 133, 109, 210,  56,  77, 172 }, /*left = d153*/
+		{  77,  19,  29, 112, 142, 228,  55,  66,  36 }, /*left = d207*/
+		{  61,  29,  29,  93,  97, 165,  83, 175, 162 }, /*left = d63 */
+		{  47,  47,  43, 114, 137, 181, 100,  99,  95 }, /*left = tm  */
+	}, {  /* above = d135 */
+		{  69,  23,  29, 128,  83, 199,  46,  44, 101 }, /*left = dc  */
+		{  53,  40,  55, 139,  69, 183,  61,  80, 110 }, /*left = v   */
+		{  40,  29,  19, 161, 180, 207,  43,  24,  91 }, /*left = h   */
+		{  60,  34,  19, 105,  61, 198,  53,  64,  89 }, /*left = d45 */
+		{  52,  31,  22, 158,  40, 209,  58,  62,  89 }, /*left = d135*/
+		{  44,  31,  29, 147,  46, 158,  56, 102, 198 }, /*left = d117*/
+		{  35,  19,  12, 135,  87, 209,  41,  45, 167 }, /*left = d153*/
+		{  55,  25,  21, 118,  95, 215,  38,  39,  66 }, /*left = d207*/
+		{  51,  38,  25, 113,  58, 164,  70,  93,  97 }, /*left = d63 */
+		{  47,  54,  34, 146, 108, 203,  72, 103, 151 }, /*left = tm  */
+	}, {  /* above = d117 */
+		{  64,  19,  37, 156,  66, 138,  49,  95, 133 }, /*left = dc  */
+		{  46,  27,  80, 150,  55, 124,  55, 121, 135 }, /*left = v   */
+		{  36,  23,  27, 165, 149, 166,  54,  64, 118 }, /*left = h   */
+		{  53,  21,  36, 131,  63, 163,  60, 109,  81 }, /*left = d45 */
+		{  40,  26,  35, 154,  40, 185,  51,  97, 123 }, /*left = d135*/
+		{  35,  19,  34, 179,  19,  97,  48, 129, 124 }, /*left = d117*/
+		{  36,  20,  26, 136,  62, 164,  33,  77, 154 }, /*left = d153*/
+		{  45,  18,  32, 130,  90, 157,  40,  79,  91 }, /*left = d207*/
+		{  45,  26,  28, 129,  45, 129,  49, 147, 123 }, /*left = d63 */
+		{  38,  44,  51, 136,  74, 162,  57,  97, 121 }, /*left = tm  */
+	}, {  /* above = d153 */
+		{  75,  17,  22, 136, 138, 185,  32,  34, 166 }, /*left = dc  */
+		{  56,  39,  58, 133, 117, 173,  48,  53, 187 }, /*left = v   */
+		{  35,  21,  12, 161, 212, 207,  20,  23, 145 }, /*left = h   */
+		{  56,  29,  19, 117, 109, 181,  55,  68, 112 }, /*left = d45 */
+		{  47,  29,  17, 153,  64, 220,  59,  51, 114 }, /*left = d135*/
+		{  46,  16,  24, 136,  76, 147,  41,  64, 172 }, /*left = d117*/
+		{  34,  17,  11, 108, 152, 187,  13,  15, 209 }, /*left = d153*/
+		{  51,  24,  14, 115, 133, 209,  32,  26, 104 }, /*left = d207*/
+		{  55,  30,  18, 122,  79, 179,  44,  88, 116 }, /*left = d63 */
+		{  37,  49,  25, 129, 168, 164,  41,  54, 148 }, /*left = tm  */
+	}, {  /* above = d207 */
+		{  82,  22,  32, 127, 143, 213,  39,  41,  70 }, /*left = dc  */
+		{  62,  44,  61, 123, 105, 189,  48,  57,  64 }, /*left = v   */
+		{  47,  25,  17, 175, 222, 220,  24,  30,  86 }, /*left = h   */
+		{  68,  36,  17, 106, 102, 206,  59,  74,  74 }, /*left = d45 */
+		{  57,  39,  23, 151,  68, 216,  55,  63,  58 }, /*left = d135*/
+		{  49,  30,  35, 141,  70, 168,  82,  40, 115 }, /*left = d117*/
+		{  51,  25,  15, 136, 129, 202,  38,  35, 139 }, /*left = d153*/
+		{  68,  26,  16, 111, 141, 215,  29,  28,  28 }, /*left = d207*/
+		{  59,  39,  19, 114,  75, 180,  77, 104,  42 }, /*left = d63 */
+		{  40,  61,  26, 126, 152, 206,  61,  59,  93 }, /*left = tm  */
+	}, {  /* above = d63 */
+		{  78,  23,  39, 111, 117, 170,  74, 124,  94 }, /*left = dc  */
+		{  48,  34,  86, 101,  92, 146,  78, 179, 134 }, /*left = v   */
+		{  47,  22,  24, 138, 187, 178,  68,  69,  59 }, /*left = h   */
+		{  56,  25,  33, 105, 112, 187,  95, 177, 129 }, /*left = d45 */
+		{  48,  31,  27, 114,  63, 183,  82, 116,  56 }, /*left = d135*/
+		{  43,  28,  37, 121,  63, 123,  61, 192, 169 }, /*left = d117*/
+		{  42,  17,  24, 109,  97, 177,  56,  76, 122 }, /*left = d153*/
+		{  58,  18,  28, 105, 139, 182,  70,  92,  63 }, /*left = d207*/
+		{  46,  23,  32,  74,  86, 150,  67, 183,  88 }, /*left = d63 */
+		{  36,  38,  48,  92, 122, 165,  88, 137,  91 }, /*left = tm  */
+	}, {  /* above = tm */
+		{  65,  70,  60, 155, 159, 199,  61,  60,  81 }, /*left = dc  */
+		{  44,  78, 115, 132, 119, 173,  71, 112,  93 }, /*left = v   */
+		{  39,  38,  21, 184, 227, 206,  42,  32,  64 }, /*left = h   */
+		{  58,  47,  36, 124, 137, 193,  80,  82,  78 }, /*left = d45 */
+		{  49,  50,  35, 144,  95, 205,  63,  78,  59 }, /*left = d135*/
+		{  41,  53,  52, 148,  71, 142,  65, 128,  51 }, /*left = d117*/
+		{  40,  36,  28, 143, 143, 202,  40,  55, 137 }, /*left = d153*/
+		{  52,  34,  29, 129, 183, 227,  42,  35,  43 }, /*left = d207*/
+		{  42,  44,  44, 104, 105, 164,  64, 130,  80 }, /*left = d63 */
+		{  43,  81,  53, 140, 169, 204,  68,  84,  72 }, /*left = tm  */
+	}
+};
+EXPORT_SYMBOL_GPL(v4l2_vp9_kf_y_mode_prob);
+
+const u8 v4l2_vp9_kf_partition_probs[16][3] = {
+	/* 8x8 -> 4x4 */
+	{ 158,  97,  94 },	/* a/l both not split   */
+	{  93,  24,  99 },	/* a split, l not split */
+	{  85, 119,  44 },	/* l split, a not split */
+	{  62,  59,  67 },	/* a/l both split       */
+	/* 16x16 -> 8x8 */
+	{ 149,  53,  53 },	/* a/l both not split   */
+	{  94,  20,  48 },	/* a split, l not split */
+	{  83,  53,  24 },	/* l split, a not split */
+	{  52,  18,  18 },	/* a/l both split       */
+	/* 32x32 -> 16x16 */
+	{ 150,  40,  39 },	/* a/l both not split   */
+	{  78,  12,  26 },	/* a split, l not split */
+	{  67,  33,  11 },	/* l split, a not split */
+	{  24,   7,   5 },	/* a/l both split       */
+	/* 64x64 -> 32x32 */
+	{ 174,  35,  49 },	/* a/l both not split   */
+	{  68,  11,  27 },	/* a split, l not split */
+	{  57,  15,   9 },	/* l split, a not split */
+	{  12,   3,   3 },	/* a/l both split       */
+};
+EXPORT_SYMBOL_GPL(v4l2_vp9_kf_partition_probs);
+
+const u8 v4l2_vp9_kf_uv_mode_prob[10][9] = {
+	{ 144,  11,  54, 157, 195, 130,  46,  58, 108 },  /* y = dc   */
+	{ 118,  15, 123, 148, 131, 101,  44,  93, 131 },  /* y = v    */
+	{ 113,  12,  23, 188, 226, 142,  26,  32, 125 },  /* y = h    */
+	{ 120,  11,  50, 123, 163, 135,  64,  77, 103 },  /* y = d45  */
+	{ 113,   9,  36, 155, 111, 157,  32,  44, 161 },  /* y = d135 */
+	{ 116,   9,  55, 176,  76,  96,  37,  61, 149 },  /* y = d117 */
+	{ 115,   9,  28, 141, 161, 167,  21,  25, 193 },  /* y = d153 */
+	{ 120,  12,  32, 145, 195, 142,  32,  38,  86 },  /* y = d207 */
+	{ 116,  12,  64, 120, 140, 125,  49, 115, 121 },  /* y = d63  */
+	{ 102,  19,  66, 162, 182, 122,  35,  59, 128 }   /* y = tm   */
+};
+EXPORT_SYMBOL_GPL(v4l2_vp9_kf_uv_mode_prob);
+
+const struct v4l2_vp9_frame_context v4l2_vp9_default_probs = {
+	.tx8 = {
+		{ 100 },
+		{  66 },
+	},
+	.tx16 = {
+		{ 20, 152 },
+		{ 15, 101 },
+	},
+	.tx32 = {
+		{ 3, 136, 37 },
+		{ 5,  52, 13 },
+	},
+	.coef = {
+		{ /* tx = 4x4 */
+			{ /* block Type 0 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 195,  29, 183 },
+						{  84,  49, 136 },
+						{   8,  42,  71 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  31, 107, 169 },
+						{  35,  99, 159 },
+						{  17,  82, 140 },
+						{   8,  66, 114 },
+						{   2,  44,  76 },
+						{   1,  19,  32 },
+					},
+					{ /* Coeff Band 2 */
+						{  40, 132, 201 },
+						{  29, 114, 187 },
+						{  13,  91, 157 },
+						{   7,  75, 127 },
+						{   3,  58,  95 },
+						{   1,  28,  47 },
+					},
+					{ /* Coeff Band 3 */
+						{  69, 142, 221 },
+						{  42, 122, 201 },
+						{  15,  91, 159 },
+						{   6,  67, 121 },
+						{   1,  42,  77 },
+						{   1,  17,  31 },
+					},
+					{ /* Coeff Band 4 */
+						{ 102, 148, 228 },
+						{  67, 117, 204 },
+						{  17,  82, 154 },
+						{   6,  59, 114 },
+						{   2,  39,  75 },
+						{   1,  15,  29 },
+					},
+					{ /* Coeff Band 5 */
+						{ 156,  57, 233 },
+						{ 119,  57, 212 },
+						{  58,  48, 163 },
+						{  29,  40, 124 },
+						{  12,  30,  81 },
+						{   3,  12,  31 }
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 191, 107, 226 },
+						{ 124, 117, 204 },
+						{  25,  99, 155 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  29, 148, 210 },
+						{  37, 126, 194 },
+						{   8,  93, 157 },
+						{   2,  68, 118 },
+						{   1,  39,  69 },
+						{   1,  17,  33 },
+					},
+					{ /* Coeff Band 2 */
+						{  41, 151, 213 },
+						{  27, 123, 193 },
+						{   3,  82, 144 },
+						{   1,  58, 105 },
+						{   1,  32,  60 },
+						{   1,  13,  26 },
+					},
+					{ /* Coeff Band 3 */
+						{  59, 159, 220 },
+						{  23, 126, 198 },
+						{   4,  88, 151 },
+						{   1,  66, 114 },
+						{   1,  38,  71 },
+						{   1,  18,  34 },
+					},
+					{ /* Coeff Band 4 */
+						{ 114, 136, 232 },
+						{  51, 114, 207 },
+						{  11,  83, 155 },
+						{   3,  56, 105 },
+						{   1,  33,  65 },
+						{   1,  17,  34 },
+					},
+					{ /* Coeff Band 5 */
+						{ 149,  65, 234 },
+						{ 121,  57, 215 },
+						{  61,  49, 166 },
+						{  28,  36, 114 },
+						{  12,  25,  76 },
+						{   3,  16,  42 },
+					},
+				},
+			},
+			{ /* block Type 1 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 214,  49, 220 },
+						{ 132,  63, 188 },
+						{  42,  65, 137 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  85, 137, 221 },
+						{ 104, 131, 216 },
+						{  49, 111, 192 },
+						{  21,  87, 155 },
+						{   2,  49,  87 },
+						{   1,  16,  28 },
+					},
+					{ /* Coeff Band 2 */
+						{  89, 163, 230 },
+						{  90, 137, 220 },
+						{  29, 100, 183 },
+						{  10,  70, 135 },
+						{   2,  42,  81 },
+						{   1,  17,  33 },
+					},
+					{ /* Coeff Band 3 */
+						{ 108, 167, 237 },
+						{  55, 133, 222 },
+						{  15,  97, 179 },
+						{   4,  72, 135 },
+						{   1,  45,  85 },
+						{   1,  19,  38 },
+					},
+					{ /* Coeff Band 4 */
+						{ 124, 146, 240 },
+						{  66, 124, 224 },
+						{  17,  88, 175 },
+						{   4,  58, 122 },
+						{   1,  36,  75 },
+						{   1,  18,  37 },
+					},
+					{ /* Coeff Band 5 */
+						{ 141,  79, 241 },
+						{ 126,  70, 227 },
+						{  66,  58, 182 },
+						{  30,  44, 136 },
+						{  12,  34,  96 },
+						{   2,  20,  47 },
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 229,  99, 249 },
+						{ 143, 111, 235 },
+						{  46, 109, 192 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  82, 158, 236 },
+						{  94, 146, 224 },
+						{  25, 117, 191 },
+						{   9,  87, 149 },
+						{   3,  56,  99 },
+						{   1,  33,  57 },
+					},
+					{ /* Coeff Band 2 */
+						{  83, 167, 237 },
+						{  68, 145, 222 },
+						{  10, 103, 177 },
+						{   2,  72, 131 },
+						{   1,  41,  79 },
+						{   1,  20,  39 },
+					},
+					{ /* Coeff Band 3 */
+						{  99, 167, 239 },
+						{  47, 141, 224 },
+						{  10, 104, 178 },
+						{   2,  73, 133 },
+						{   1,  44,  85 },
+						{   1,  22,  47 },
+					},
+					{ /* Coeff Band 4 */
+						{ 127, 145, 243 },
+						{  71, 129, 228 },
+						{  17,  93, 177 },
+						{   3,  61, 124 },
+						{   1,  41,  84 },
+						{   1,  21,  52 },
+					},
+					{ /* Coeff Band 5 */
+						{ 157,  78, 244 },
+						{ 140,  72, 231 },
+						{  69,  58, 184 },
+						{  31,  44, 137 },
+						{  14,  38, 105 },
+						{   8,  23,  61 },
+					},
+				},
+			},
+		},
+		{ /* tx = 8x8 */
+			{ /* block Type 0 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 125,  34, 187 },
+						{  52,  41, 133 },
+						{   6,  31,  56 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  37, 109, 153 },
+						{  51, 102, 147 },
+						{  23,  87, 128 },
+						{   8,  67, 101 },
+						{   1,  41,  63 },
+						{   1,  19,  29 },
+					},
+					{ /* Coeff Band 2 */
+						{  31, 154, 185 },
+						{  17, 127, 175 },
+						{   6,  96, 145 },
+						{   2,  73, 114 },
+						{   1,  51,  82 },
+						{   1,  28,  45 },
+					},
+					{ /* Coeff Band 3 */
+						{  23, 163, 200 },
+						{  10, 131, 185 },
+						{   2,  93, 148 },
+						{   1,  67, 111 },
+						{   1,  41,  69 },
+						{   1,  14,  24 },
+					},
+					{ /* Coeff Band 4 */
+						{  29, 176, 217 },
+						{  12, 145, 201 },
+						{   3, 101, 156 },
+						{   1,  69, 111 },
+						{   1,  39,  63 },
+						{   1,  14,  23 },
+					},
+					{ /* Coeff Band 5 */
+						{  57, 192, 233 },
+						{  25, 154, 215 },
+						{   6, 109, 167 },
+						{   3,  78, 118 },
+						{   1,  48,  69 },
+						{   1,  21,  29 },
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 202, 105, 245 },
+						{ 108, 106, 216 },
+						{  18,  90, 144 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  33, 172, 219 },
+						{  64, 149, 206 },
+						{  14, 117, 177 },
+						{   5,  90, 141 },
+						{   2,  61,  95 },
+						{   1,  37,  57 },
+					},
+					{ /* Coeff Band 2 */
+						{  33, 179, 220 },
+						{  11, 140, 198 },
+						{   1,  89, 148 },
+						{   1,  60, 104 },
+						{   1,  33,  57 },
+						{   1,  12,  21 },
+					},
+					{ /* Coeff Band 3 */
+						{  30, 181, 221 },
+						{   8, 141, 198 },
+						{   1,  87, 145 },
+						{   1,  58, 100 },
+						{   1,  31,  55 },
+						{   1,  12,  20 },
+					},
+					{ /* Coeff Band 4 */
+						{  32, 186, 224 },
+						{   7, 142, 198 },
+						{   1,  86, 143 },
+						{   1,  58, 100 },
+						{   1,  31,  55 },
+						{   1,  12,  22 },
+					},
+					{ /* Coeff Band 5 */
+						{  57, 192, 227 },
+						{  20, 143, 204 },
+						{   3,  96, 154 },
+						{   1,  68, 112 },
+						{   1,  42,  69 },
+						{   1,  19,  32 },
+					},
+				},
+			},
+			{ /* block Type 1 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 212,  35, 215 },
+						{ 113,  47, 169 },
+						{  29,  48, 105 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  74, 129, 203 },
+						{ 106, 120, 203 },
+						{  49, 107, 178 },
+						{  19,  84, 144 },
+						{   4,  50,  84 },
+						{   1,  15,  25 },
+					},
+					{ /* Coeff Band 2 */
+						{  71, 172, 217 },
+						{  44, 141, 209 },
+						{  15, 102, 173 },
+						{   6,  76, 133 },
+						{   2,  51,  89 },
+						{   1,  24,  42 },
+					},
+					{ /* Coeff Band 3 */
+						{  64, 185, 231 },
+						{  31, 148, 216 },
+						{   8, 103, 175 },
+						{   3,  74, 131 },
+						{   1,  46,  81 },
+						{   1,  18,  30 },
+					},
+					{ /* Coeff Band 4 */
+						{  65, 196, 235 },
+						{  25, 157, 221 },
+						{   5, 105, 174 },
+						{   1,  67, 120 },
+						{   1,  38,  69 },
+						{   1,  15,  30 },
+					},
+					{ /* Coeff Band 5 */
+						{  65, 204, 238 },
+						{  30, 156, 224 },
+						{   7, 107, 177 },
+						{   2,  70, 124 },
+						{   1,  42,  73 },
+						{   1,  18,  34 },
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 225,  86, 251 },
+						{ 144, 104, 235 },
+						{  42,  99, 181 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  85, 175, 239 },
+						{ 112, 165, 229 },
+						{  29, 136, 200 },
+						{  12, 103, 162 },
+						{   6,  77, 123 },
+						{   2,  53,  84 },
+					},
+					{ /* Coeff Band 2 */
+						{  75, 183, 239 },
+						{  30, 155, 221 },
+						{   3, 106, 171 },
+						{   1,  74, 128 },
+						{   1,  44,  76 },
+						{   1,  17,  28 },
+					},
+					{ /* Coeff Band 3 */
+						{  73, 185, 240 },
+						{  27, 159, 222 },
+						{   2, 107, 172 },
+						{   1,  75, 127 },
+						{   1,  42,  73 },
+						{   1,  17,  29 },
+					},
+					{ /* Coeff Band 4 */
+						{  62, 190, 238 },
+						{  21, 159, 222 },
+						{   2, 107, 172 },
+						{   1,  72, 122 },
+						{   1,  40,  71 },
+						{   1,  18,  32 },
+					},
+					{ /* Coeff Band 5 */
+						{  61, 199, 240 },
+						{  27, 161, 226 },
+						{   4, 113, 180 },
+						{   1,  76, 129 },
+						{   1,  46,  80 },
+						{   1,  23,  41 },
+					},
+				},
+			},
+		},
+		{ /* tx = 16x16 */
+			{ /* block Type 0 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{   7,  27, 153 },
+						{   5,  30,  95 },
+						{   1,  16,  30 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  50,  75, 127 },
+						{  57,  75, 124 },
+						{  27,  67, 108 },
+						{  10,  54,  86 },
+						{   1,  33,  52 },
+						{   1,  12,  18 },
+					},
+					{ /* Coeff Band 2 */
+						{  43, 125, 151 },
+						{  26, 108, 148 },
+						{   7,  83, 122 },
+						{   2,  59,  89 },
+						{   1,  38,  60 },
+						{   1,  17,  27 },
+					},
+					{ /* Coeff Band 3 */
+						{  23, 144, 163 },
+						{  13, 112, 154 },
+						{   2,  75, 117 },
+						{   1,  50,  81 },
+						{   1,  31,  51 },
+						{   1,  14,  23 },
+					},
+					{ /* Coeff Band 4 */
+						{  18, 162, 185 },
+						{   6, 123, 171 },
+						{   1,  78, 125 },
+						{   1,  51,  86 },
+						{   1,  31,  54 },
+						{   1,  14,  23 },
+					},
+					{ /* Coeff Band 5 */
+						{  15, 199, 227 },
+						{   3, 150, 204 },
+						{   1,  91, 146 },
+						{   1,  55,  95 },
+						{   1,  30,  53 },
+						{   1,  11,  20 },
+					}
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{  19,  55, 240 },
+						{  19,  59, 196 },
+						{   3,  52, 105 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  41, 166, 207 },
+						{ 104, 153, 199 },
+						{  31, 123, 181 },
+						{  14, 101, 152 },
+						{   5,  72, 106 },
+						{   1,  36,  52 },
+					},
+					{ /* Coeff Band 2 */
+						{  35, 176, 211 },
+						{  12, 131, 190 },
+						{   2,  88, 144 },
+						{   1,  60, 101 },
+						{   1,  36,  60 },
+						{   1,  16,  28 },
+					},
+					{ /* Coeff Band 3 */
+						{  28, 183, 213 },
+						{   8, 134, 191 },
+						{   1,  86, 142 },
+						{   1,  56,  96 },
+						{   1,  30,  53 },
+						{   1,  12,  20 },
+					},
+					{ /* Coeff Band 4 */
+						{  20, 190, 215 },
+						{   4, 135, 192 },
+						{   1,  84, 139 },
+						{   1,  53,  91 },
+						{   1,  28,  49 },
+						{   1,  11,  20 },
+					},
+					{ /* Coeff Band 5 */
+						{  13, 196, 216 },
+						{   2, 137, 192 },
+						{   1,  86, 143 },
+						{   1,  57,  99 },
+						{   1,  32,  56 },
+						{   1,  13,  24 },
+					},
+				},
+			},
+			{ /* block Type 1 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 211,  29, 217 },
+						{  96,  47, 156 },
+						{  22,  43,  87 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  78, 120, 193 },
+						{ 111, 116, 186 },
+						{  46, 102, 164 },
+						{  15,  80, 128 },
+						{   2,  49,  76 },
+						{   1,  18,  28 },
+					},
+					{ /* Coeff Band 2 */
+						{  71, 161, 203 },
+						{  42, 132, 192 },
+						{  10,  98, 150 },
+						{   3,  69, 109 },
+						{   1,  44,  70 },
+						{   1,  18,  29 },
+					},
+					{ /* Coeff Band 3 */
+						{  57, 186, 211 },
+						{  30, 140, 196 },
+						{   4,  93, 146 },
+						{   1,  62, 102 },
+						{   1,  38,  65 },
+						{   1,  16,  27 },
+					},
+					{ /* Coeff Band 4 */
+						{  47, 199, 217 },
+						{  14, 145, 196 },
+						{   1,  88, 142 },
+						{   1,  57,  98 },
+						{   1,  36,  62 },
+						{   1,  15,  26 },
+					},
+					{ /* Coeff Band 5 */
+						{  26, 219, 229 },
+						{   5, 155, 207 },
+						{   1,  94, 151 },
+						{   1,  60, 104 },
+						{   1,  36,  62 },
+						{   1,  16,  28 },
+					}
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 233,  29, 248 },
+						{ 146,  47, 220 },
+						{  43,  52, 140 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{ 100, 163, 232 },
+						{ 179, 161, 222 },
+						{  63, 142, 204 },
+						{  37, 113, 174 },
+						{  26,  89, 137 },
+						{  18,  68,  97 },
+					},
+					{ /* Coeff Band 2 */
+						{  85, 181, 230 },
+						{  32, 146, 209 },
+						{   7, 100, 164 },
+						{   3,  71, 121 },
+						{   1,  45,  77 },
+						{   1,  18,  30 },
+					},
+					{ /* Coeff Band 3 */
+						{  65, 187, 230 },
+						{  20, 148, 207 },
+						{   2,  97, 159 },
+						{   1,  68, 116 },
+						{   1,  40,  70 },
+						{   1,  14,  29 },
+					},
+					{ /* Coeff Band 4 */
+						{  40, 194, 227 },
+						{   8, 147, 204 },
+						{   1,  94, 155 },
+						{   1,  65, 112 },
+						{   1,  39,  66 },
+						{   1,  14,  26 },
+					},
+					{ /* Coeff Band 5 */
+						{  16, 208, 228 },
+						{   3, 151, 207 },
+						{   1,  98, 160 },
+						{   1,  67, 117 },
+						{   1,  41,  74 },
+						{   1,  17,  31 },
+					},
+				},
+			},
+		},
+		{ /* tx = 32x32 */
+			{ /* block Type 0 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{  17,  38, 140 },
+						{   7,  34,  80 },
+						{   1,  17,  29 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  37,  75, 128 },
+						{  41,  76, 128 },
+						{  26,  66, 116 },
+						{  12,  52,  94 },
+						{   2,  32,  55 },
+						{   1,  10,  16 },
+					},
+					{ /* Coeff Band 2 */
+						{  50, 127, 154 },
+						{  37, 109, 152 },
+						{  16,  82, 121 },
+						{   5,  59,  85 },
+						{   1,  35,  54 },
+						{   1,  13,  20 },
+					},
+					{ /* Coeff Band 3 */
+						{  40, 142, 167 },
+						{  17, 110, 157 },
+						{   2,  71, 112 },
+						{   1,  44,  72 },
+						{   1,  27,  45 },
+						{   1,  11,  17 },
+					},
+					{ /* Coeff Band 4 */
+						{  30, 175, 188 },
+						{   9, 124, 169 },
+						{   1,  74, 116 },
+						{   1,  48,  78 },
+						{   1,  30,  49 },
+						{   1,  11,  18 },
+					},
+					{ /* Coeff Band 5 */
+						{  10, 222, 223 },
+						{   2, 150, 194 },
+						{   1,  83, 128 },
+						{   1,  48,  79 },
+						{   1,  27,  45 },
+						{   1,  11,  17 },
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{  36,  41, 235 },
+						{  29,  36, 193 },
+						{  10,  27, 111 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  85, 165, 222 },
+						{ 177, 162, 215 },
+						{ 110, 135, 195 },
+						{  57, 113, 168 },
+						{  23,  83, 120 },
+						{  10,  49,  61 },
+					},
+					{ /* Coeff Band 2 */
+						{  85, 190, 223 },
+						{  36, 139, 200 },
+						{   5,  90, 146 },
+						{   1,  60, 103 },
+						{   1,  38,  65 },
+						{   1,  18,  30 },
+					},
+					{ /* Coeff Band 3 */
+						{  72, 202, 223 },
+						{  23, 141, 199 },
+						{   2,  86, 140 },
+						{   1,  56,  97 },
+						{   1,  36,  61 },
+						{   1,  16,  27 },
+					},
+					{ /* Coeff Band 4 */
+						{  55, 218, 225 },
+						{  13, 145, 200 },
+						{   1,  86, 141 },
+						{   1,  57,  99 },
+						{   1,  35,  61 },
+						{   1,  13,  22 },
+					},
+					{ /* Coeff Band 5 */
+						{  15, 235, 212 },
+						{   1, 132, 184 },
+						{   1,  84, 139 },
+						{   1,  57,  97 },
+						{   1,  34,  56 },
+						{   1,  14,  23 },
+					},
+				},
+			},
+			{ /* block Type 1 */
+				{ /* Intra */
+					{ /* Coeff Band 0 */
+						{ 181,  21, 201 },
+						{  61,  37, 123 },
+						{  10,  38,  71 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{  47, 106, 172 },
+						{  95, 104, 173 },
+						{  42,  93, 159 },
+						{  18,  77, 131 },
+						{   4,  50,  81 },
+						{   1,  17,  23 },
+					},
+					{ /* Coeff Band 2 */
+						{  62, 147, 199 },
+						{  44, 130, 189 },
+						{  28, 102, 154 },
+						{  18,  75, 115 },
+						{   2,  44,  65 },
+						{   1,  12,  19 },
+					},
+					{ /* Coeff Band 3 */
+						{  55, 153, 210 },
+						{  24, 130, 194 },
+						{   3,  93, 146 },
+						{   1,  61,  97 },
+						{   1,  31,  50 },
+						{   1,  10,  16 },
+					},
+					{ /* Coeff Band 4 */
+						{  49, 186, 223 },
+						{  17, 148, 204 },
+						{   1,  96, 142 },
+						{   1,  53,  83 },
+						{   1,  26,  44 },
+						{   1,  11,  17 },
+					},
+					{ /* Coeff Band 5 */
+						{  13, 217, 212 },
+						{   2, 136, 180 },
+						{   1,  78, 124 },
+						{   1,  50,  83 },
+						{   1,  29,  49 },
+						{   1,  14,  23 },
+					},
+				},
+				{ /* Inter */
+					{ /* Coeff Band 0 */
+						{ 197,  13, 247 },
+						{  82,  17, 222 },
+						{  25,  17, 162 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+						{   0,   0,   0 },
+					},
+					{ /* Coeff Band 1 */
+						{ 126, 186, 247 },
+						{ 234, 191, 243 },
+						{ 176, 177, 234 },
+						{ 104, 158, 220 },
+						{  66, 128, 186 },
+						{  55,  90, 137 },
+					},
+					{ /* Coeff Band 2 */
+						{ 111, 197, 242 },
+						{  46, 158, 219 },
+						{   9, 104, 171 },
+						{   2,  65, 125 },
+						{   1,  44,  80 },
+						{   1,  17,  91 },
+					},
+					{ /* Coeff Band 3 */
+						{ 104, 208, 245 },
+						{  39, 168, 224 },
+						{   3, 109, 162 },
+						{   1,  79, 124 },
+						{   1,  50, 102 },
+						{   1,  43, 102 },
+					},
+					{ /* Coeff Band 4 */
+						{  84, 220, 246 },
+						{  31, 177, 231 },
+						{   2, 115, 180 },
+						{   1,  79, 134 },
+						{   1,  55,  77 },
+						{   1,  60,  79 },
+					},
+					{ /* Coeff Band 5 */
+						{  43, 243, 240 },
+						{   8, 180, 217 },
+						{   1, 115, 166 },
+						{   1,  84, 121 },
+						{   1,  51,  67 },
+						{   1,  16,   6 },
+					},
+				},
+			},
+		},
+	},
+
+	.skip = { 192, 128, 64 },
+	.inter_mode = {
+		{  2, 173, 34 },
+		{  7, 145, 85 },
+		{  7, 166, 63 },
+		{  7,  94, 66 },
+		{  8,  64, 46 },
+		{ 17,  81, 31 },
+		{ 25,  29, 30 },
+	},
+	.interp_filter = {
+		{ 235, 162 },
+		{  36, 255 },
+		{  34,   3 },
+		{ 149, 144 },
+	},
+	.is_inter = { 9, 102, 187, 225 },
+	.comp_mode = { 239, 183, 119, 96, 41 },
+	.single_ref = {
+		{  33,  16 },
+		{  77,  74 },
+		{ 142, 142 },
+		{ 172, 170 },
+		{ 238, 247 },
+	},
+	.comp_ref = { 50, 126, 123, 221, 226 },
+	.y_mode = {
+		{  65,  32, 18, 144, 162, 194, 41, 51, 98 },
+		{ 132,  68, 18, 165, 217, 196, 45, 40, 78 },
+		{ 173,  80, 19, 176, 240, 193, 64, 35, 46 },
+		{ 221, 135, 38, 194, 248, 121, 96, 85, 29 },
+	},
+	.uv_mode = {
+		{ 120,   7,  76, 176, 208, 126,  28,  54, 103 } /* y = dc */,
+		{  48,  12, 154, 155, 139,  90,  34, 117, 119 } /* y = v */,
+		{  67,   6,  25, 204, 243, 158,  13,  21,  96 } /* y = h */,
+		{  97,   5,  44, 131, 176, 139,  48,  68,  97 } /* y = d45 */,
+		{  83,   5,  42, 156, 111, 152,  26,  49, 152 } /* y = d135 */,
+		{  80,   5,  58, 178,  74,  83,  33,  62, 145 } /* y = d117 */,
+		{  86,   5,  32, 154, 192, 168,  14,  22, 163 } /* y = d153 */,
+		{  85,   5,  32, 156, 216, 148,  19,  29,  73 } /* y = d207 */,
+		{  77,   7,  64, 116, 132, 122,  37, 126, 120 } /* y = d63 */,
+		{ 101,  21, 107, 181, 192, 103,  19,  67, 125 } /* y = tm */
+	},
+	.partition = {
+		/* 8x8 -> 4x4 */
+		{ 199, 122, 141 } /* a/l both not split */,
+		{ 147,  63, 159 } /* a split, l not split */,
+		{ 148, 133, 118 } /* l split, a not split */,
+		{ 121, 104, 114 } /* a/l both split */,
+		/* 16x16 -> 8x8 */
+		{ 174,  73,  87 } /* a/l both not split */,
+		{  92,  41,  83 } /* a split, l not split */,
+		{  82,  99,  50 } /* l split, a not split */,
+		{  53,  39,  39 } /* a/l both split */,
+		/* 32x32 -> 16x16 */
+		{ 177,  58,  59 } /* a/l both not split */,
+		{  68,  26,  63 } /* a split, l not split */,
+		{  52,  79,  25 } /* l split, a not split */,
+		{  17,  14,  12 } /* a/l both split */,
+		/* 64x64 -> 32x32 */
+		{ 222,  34,  30 } /* a/l both not split */,
+		{  72,  16,  44 } /* a split, l not split */,
+		{  58,  32,  12 } /* l split, a not split */,
+		{  10,   7,   6 } /* a/l both split */,
+	},
+
+	.mv = {
+		.joint = { 32, 64, 96 },
+		.sign = { 128, 128 },
+		.classes = {
+			{ 224, 144, 192, 168, 192, 176, 192, 198, 198, 245 },
+			{ 216, 128, 176, 160, 176, 176, 192, 198, 198, 208 },
+		},
+		.class0_bit = { 216, 208 },
+		.bits = {
+			{ 136, 140, 148, 160, 176, 192, 224, 234, 234, 240},
+			{ 136, 140, 148, 160, 176, 192, 224, 234, 234, 240},
+		},
+		.class0_fr = {
+			{
+				{ 128, 128, 64 },
+				{  96, 112, 64 },
+			},
+			{
+				{ 128, 128, 64 },
+				{  96, 112, 64 },
+			},
+		},
+		.fr = {
+			{ 64, 96, 64 },
+			{ 64, 96, 64 },
+		},
+		.class0_hp = { 160, 160 },
+		.hp = { 128, 128 },
+	},
+};
+EXPORT_SYMBOL_GPL(v4l2_vp9_default_probs);
+
+static u32 fastdiv(u32 dividend, u16 divisor)
+{
+#define DIV_INV(d)	((u32)(((1ULL << 32) + ((d) - 1)) / (d)))
+#define DIVS_INV(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9)	\
+	DIV_INV(d0), DIV_INV(d1), DIV_INV(d2), DIV_INV(d3),	\
+	DIV_INV(d4), DIV_INV(d5), DIV_INV(d6), DIV_INV(d7),	\
+	DIV_INV(d8), DIV_INV(d9)
+
+	static const u32 inv[] = {
+		DIV_INV(2), DIV_INV(3), DIV_INV(4), DIV_INV(5),
+		DIV_INV(6), DIV_INV(7), DIV_INV(8), DIV_INV(9),
+		DIVS_INV(10, 11, 12, 13, 14, 15, 16, 17, 18, 19),
+		DIVS_INV(20, 21, 22, 23, 24, 25, 26, 27, 28, 29),
+		DIVS_INV(30, 31, 32, 33, 34, 35, 36, 37, 38, 39),
+		DIVS_INV(40, 41, 42, 43, 44, 45, 46, 47, 48, 49),
+		DIVS_INV(50, 51, 52, 53, 54, 55, 56, 57, 58, 59),
+		DIVS_INV(60, 61, 62, 63, 64, 65, 66, 67, 68, 69),
+		DIVS_INV(70, 71, 72, 73, 74, 75, 76, 77, 78, 79),
+		DIVS_INV(80, 81, 82, 83, 84, 85, 86, 87, 88, 89),
+		DIVS_INV(90, 91, 92, 93, 94, 95, 96, 97, 98, 99),
+		DIVS_INV(100, 101, 102, 103, 104, 105, 106, 107, 108, 109),
+		DIVS_INV(110, 111, 112, 113, 114, 115, 116, 117, 118, 119),
+		DIVS_INV(120, 121, 122, 123, 124, 125, 126, 127, 128, 129),
+		DIVS_INV(130, 131, 132, 133, 134, 135, 136, 137, 138, 139),
+		DIVS_INV(140, 141, 142, 143, 144, 145, 146, 147, 148, 149),
+		DIVS_INV(150, 151, 152, 153, 154, 155, 156, 157, 158, 159),
+		DIVS_INV(160, 161, 162, 163, 164, 165, 166, 167, 168, 169),
+		DIVS_INV(170, 171, 172, 173, 174, 175, 176, 177, 178, 179),
+		DIVS_INV(180, 181, 182, 183, 184, 185, 186, 187, 188, 189),
+		DIVS_INV(190, 191, 192, 193, 194, 195, 196, 197, 198, 199),
+		DIVS_INV(200, 201, 202, 203, 204, 205, 206, 207, 208, 209),
+		DIVS_INV(210, 211, 212, 213, 214, 215, 216, 217, 218, 219),
+		DIVS_INV(220, 221, 222, 223, 224, 225, 226, 227, 228, 229),
+		DIVS_INV(230, 231, 232, 233, 234, 235, 236, 237, 238, 239),
+		DIVS_INV(240, 241, 242, 243, 244, 245, 246, 247, 248, 249),
+		DIV_INV(250), DIV_INV(251), DIV_INV(252), DIV_INV(253),
+		DIV_INV(254), DIV_INV(255), DIV_INV(256),
+	};
+
+	if (divisor == 0)
+		return 0;
+	else if (divisor == 1)
+		return dividend;
+
+	if (WARN_ON(divisor - 2 >= ARRAY_SIZE(inv)))
+		return dividend;
+
+	return ((u64)dividend * inv[divisor - 2]) >> 32;
+}
+
+/* 6.3.6 inv_recenter_nonneg(v, m) */
+static int inv_recenter_nonneg(int v, int m)
+{
+	if (v > 2 * m)
+		return v;
+
+	if (v & 1)
+		return m - ((v + 1) >> 1);
+
+	return m + (v >> 1);
+}
+
+/*
+ * part of 6.3.5 inv_remap_prob(deltaProb, prob)
+ * delta = inv_map_table[deltaProb] done by userspace
+ */
+static int update_prob(int delta, int prob)
+{
+	if (!delta)
+		return prob;
+
+	return prob <= 128 ?
+		1 + inv_recenter_nonneg(delta, prob - 1) :
+		255 - inv_recenter_nonneg(delta, 255 - prob);
+}
+
+/* Counterpart to 6.3.2 tx_mode_probs() */
+static void update_tx_probs(struct v4l2_vp9_frame_context *probs,
+			    const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(probs->tx8); i++) {
+		u8 *p8x8 = probs->tx8[i];
+		u8 *p16x16 = probs->tx16[i];
+		u8 *p32x32 = probs->tx32[i];
+		const u8 *d8x8 = deltas->tx8[i];
+		const u8 *d16x16 = deltas->tx16[i];
+		const u8 *d32x32 = deltas->tx32[i];
+
+		p8x8[0] = update_prob(d8x8[0], p8x8[0]);
+		p16x16[0] = update_prob(d16x16[0], p16x16[0]);
+		p16x16[1] = update_prob(d16x16[1], p16x16[1]);
+		p32x32[0] = update_prob(d32x32[0], p32x32[0]);
+		p32x32[1] = update_prob(d32x32[1], p32x32[1]);
+		p32x32[2] = update_prob(d32x32[2], p32x32[2]);
+	}
+}
+
+#define BAND_6(band) ((band) == 0 ? 3 : 6)
+
+static void update_coeff(const u8 deltas[6][6][3], u8 probs[6][6][3])
+{
+	int l, m, n;
+
+	for (l = 0; l < 6; l++)
+		for (m = 0; m < BAND_6(l); m++) {
+			u8 *p = probs[l][m];
+			const u8 *d = deltas[l][m];
+
+			for (n = 0; n < 3; n++)
+				p[n] = update_prob(d[n], p[n]);
+		}
+}
+
+/* Counterpart to 6.3.7 read_coef_probs() */
+static void update_coef_probs(struct v4l2_vp9_frame_context *probs,
+			      const struct v4l2_ctrl_vp9_compressed_hdr *deltas,
+			      const struct v4l2_ctrl_vp9_frame *dec_params)
+{
+	int i, j, k;
+
+	for (i = 0; i < ARRAY_SIZE(probs->coef); i++) {
+		for (j = 0; j < ARRAY_SIZE(probs->coef[0]); j++)
+			for (k = 0; k < ARRAY_SIZE(probs->coef[0][0]); k++)
+				update_coeff(deltas->coef[i][j][k], probs->coef[i][j][k]);
+
+		if (deltas->tx_mode == i)
+			break;
+	}
+}
+
+/* Counterpart to 6.3.8 read_skip_prob() */
+static void update_skip_probs(struct v4l2_vp9_frame_context *probs,
+			      const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(probs->skip); i++)
+		probs->skip[i] = update_prob(deltas->skip[i], probs->skip[i]);
+}
+
+/* Counterpart to 6.3.9 read_inter_mode_probs() */
+static void update_inter_mode_probs(struct v4l2_vp9_frame_context *probs,
+				    const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(probs->inter_mode); i++) {
+		u8 *p = probs->inter_mode[i];
+		const u8 *d = deltas->inter_mode[i];
+
+		p[0] = update_prob(d[0], p[0]);
+		p[1] = update_prob(d[1], p[1]);
+		p[2] = update_prob(d[2], p[2]);
+	}
+}
+
+/* Counterpart to 6.3.10 read_interp_filter_probs() */
+static void update_interp_filter_probs(struct v4l2_vp9_frame_context *probs,
+				       const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(probs->interp_filter); i++) {
+		u8 *p = probs->interp_filter[i];
+		const u8 *d = deltas->interp_filter[i];
+
+		p[0] = update_prob(d[0], p[0]);
+		p[1] = update_prob(d[1], p[1]);
+	}
+}
+
+/* Counterpart to 6.3.11 read_is_inter_probs() */
+static void update_is_inter_probs(struct v4l2_vp9_frame_context *probs,
+				  const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(probs->is_inter); i++)
+		probs->is_inter[i] = update_prob(deltas->is_inter[i], probs->is_inter[i]);
+}
+
+/* 6.3.12 frame_reference_mode() done entirely in userspace */
+
+/* Counterpart to 6.3.13 frame_reference_mode_probs() */
+static void
+update_frame_reference_mode_probs(enum v4l2_vp9_reference_mode reference_mode,
+				  struct v4l2_vp9_frame_context *probs,
+				  const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i;
+
+	if (reference_mode == V4L2_VP9_REFERENCE_MODE_SELECT)
+		for (i = 0; i < ARRAY_SIZE(probs->comp_mode); i++)
+			probs->comp_mode[i] = update_prob(deltas->comp_mode[i],
+							  probs->comp_mode[i]);
+
+	if (reference_mode != V4L2_VP9_REFERENCE_MODE_COMPOUND_REFERENCE)
+		for (i = 0; i < ARRAY_SIZE(probs->single_ref); i++) {
+			u8 *p = probs->single_ref[i];
+			const u8 *d = deltas->single_ref[i];
+
+			p[0] = update_prob(d[0], p[0]);
+			p[1] = update_prob(d[1], p[1]);
+		}
+
+	if (reference_mode != V4L2_VP9_REFERENCE_MODE_SINGLE_REFERENCE)
+		for (i = 0; i < ARRAY_SIZE(probs->comp_ref); i++)
+			probs->comp_ref[i] = update_prob(deltas->comp_ref[i], probs->comp_ref[i]);
+}
+
+/* Counterpart to 6.3.14 read_y_mode_probs() */
+static void update_y_mode_probs(struct v4l2_vp9_frame_context *probs,
+				const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(probs->y_mode); i++)
+		for (j = 0; j < ARRAY_SIZE(probs->y_mode[0]); ++j)
+			probs->y_mode[i][j] =
+				update_prob(deltas->y_mode[i][j], probs->y_mode[i][j]);
+}
+
+/* Counterpart to 6.3.15 read_partition_probs() */
+static void update_partition_probs(struct v4l2_vp9_frame_context *probs,
+				   const struct v4l2_ctrl_vp9_compressed_hdr *deltas)
+{
+	int i, j;
+
+	for (i = 0; i < 4; i++)
+		for (j = 0; j < 4; j++) {
+			u8 *p = probs->partition[i * 4 + j];
+			const u8 *d = deltas->partition[i * 4 + j];
+
+			p[0] = update_prob(d[0], p[0]);
+			p[1] = update_prob(d[1], p[1]);
+			p[2] = update_prob(d[2], p[2]);
+		}
+}
+
+static inline int update_mv_prob(int delta, int prob)
+{
+	if (!delta)
+		return prob;
+
+	return delta;
+}
+
+/* Counterpart to 6.3.16 mv_probs() */
+static void update_mv_probs(struct v4l2_vp9_frame_context *probs,
+			    const struct v4l2_ctrl_vp9_compressed_hdr *deltas,
+			    const struct v4l2_ctrl_vp9_frame *dec_params)
+{
+	u8 *p = probs->mv.joint;
+	const u8 *d = deltas->mv.joint;
+	unsigned int i, j;
+
+	p[0] = update_mv_prob(d[0], p[0]);
+	p[1] = update_mv_prob(d[1], p[1]);
+	p[2] = update_mv_prob(d[2], p[2]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->mv.sign); i++) {
+		p = probs->mv.sign;
+		d = deltas->mv.sign;
+		p[i] = update_mv_prob(d[i], p[i]);
+
+		p = probs->mv.classes[i];
+		d = deltas->mv.classes[i];
+		for (j = 0; j < ARRAY_SIZE(probs->mv.classes[0]); j++)
+			p[j] = update_mv_prob(d[j], p[j]);
+
+		p = probs->mv.class0_bit;
+		d = deltas->mv.class0_bit;
+		p[i] = update_mv_prob(d[i], p[i]);
+
+		p = probs->mv.bits[i];
+		d = deltas->mv.bits[i];
+		for (j = 0; j < ARRAY_SIZE(probs->mv.bits[0]); j++)
+			p[j] = update_mv_prob(d[j], p[j]);
+
+		for (j = 0; j < ARRAY_SIZE(probs->mv.class0_fr[0]); j++) {
+			p = probs->mv.class0_fr[i][j];
+			d = deltas->mv.class0_fr[i][j];
+
+			p[0] = update_mv_prob(d[0], p[0]);
+			p[1] = update_mv_prob(d[1], p[1]);
+			p[2] = update_mv_prob(d[2], p[2]);
+		}
+
+		p = probs->mv.fr[i];
+		d = deltas->mv.fr[i];
+		for (j = 0; j < ARRAY_SIZE(probs->mv.fr[i]); j++)
+			p[j] = update_mv_prob(d[j], p[j]);
+
+		if (dec_params->flags & V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV) {
+			p = probs->mv.class0_hp;
+			d = deltas->mv.class0_hp;
+			p[i] = update_mv_prob(d[i], p[i]);
+
+			p = probs->mv.hp;
+			d = deltas->mv.hp;
+			p[i] = update_mv_prob(d[i], p[i]);
+		}
+	}
+}
+
+/* Counterpart to 6.3 compressed_header(), but parsing has been done in userspace. */
+void v4l2_vp9_fw_update_probs(struct v4l2_vp9_frame_context *probs,
+			      const struct v4l2_ctrl_vp9_compressed_hdr *deltas,
+			      const struct v4l2_ctrl_vp9_frame *dec_params)
+{
+	if (deltas->tx_mode == V4L2_VP9_TX_MODE_SELECT)
+		update_tx_probs(probs, deltas);
+
+	update_coef_probs(probs, deltas, dec_params);
+
+	update_skip_probs(probs, deltas);
+
+	if (dec_params->flags & V4L2_VP9_FRAME_FLAG_KEY_FRAME ||
+	    dec_params->flags & V4L2_VP9_FRAME_FLAG_INTRA_ONLY)
+		return;
+
+	update_inter_mode_probs(probs, deltas);
+
+	if (dec_params->interpolation_filter == V4L2_VP9_INTERP_FILTER_SWITCHABLE)
+		update_interp_filter_probs(probs, deltas);
+
+	update_is_inter_probs(probs, deltas);
+
+	update_frame_reference_mode_probs(dec_params->reference_mode, probs, deltas);
+
+	update_y_mode_probs(probs, deltas);
+
+	update_partition_probs(probs, deltas);
+
+	update_mv_probs(probs, deltas, dec_params);
+}
+EXPORT_SYMBOL_GPL(v4l2_vp9_fw_update_probs);
+
+u8 v4l2_vp9_reset_frame_ctx(const struct v4l2_ctrl_vp9_frame *dec_params,
+			    struct v4l2_vp9_frame_context *frame_context)
+{
+	int i;
+
+	u8 fctx_idx = dec_params->frame_context_idx;
+
+	if (dec_params->flags & V4L2_VP9_FRAME_FLAG_KEY_FRAME ||
+	    dec_params->flags & V4L2_VP9_FRAME_FLAG_INTRA_ONLY ||
+	    dec_params->flags & V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT) {
+		/*
+		 * setup_past_independence()
+		 * We do nothing here. Instead of storing default probs in some intermediate
+		 * location and then copying from that location to appropriate contexts
+		 * in save_probs() below, we skip that step and save default probs directly
+		 * to appropriate contexts.
+		 */
+		if (dec_params->flags & V4L2_VP9_FRAME_FLAG_KEY_FRAME ||
+		    dec_params->flags & V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT ||
+		    dec_params->reset_frame_context == V4L2_VP9_RESET_FRAME_CTX_ALL)
+			for (i = 0; i < 4; ++i)
+				/* save_probs(i) */
+				memcpy(&frame_context[i], &v4l2_vp9_default_probs,
+				       sizeof(v4l2_vp9_default_probs));
+		else if (dec_params->reset_frame_context == V4L2_VP9_RESET_FRAME_CTX_SPEC)
+			/* save_probs(fctx_idx) */
+			memcpy(&frame_context[fctx_idx], &v4l2_vp9_default_probs,
+			       sizeof(v4l2_vp9_default_probs));
+		fctx_idx = 0;
+	}
+
+	return fctx_idx;
+}
+EXPORT_SYMBOL_GPL(v4l2_vp9_reset_frame_ctx);
+
+/* 8.4.1 Merge prob process */
+static u8 merge_prob(u8 pre_prob, u32 ct0, u32 ct1, u16 count_sat, u32 max_update_factor)
+{
+	u32 den, prob, count, factor;
+
+	den = ct0 + ct1;
+	if (!den) {
+		/*
+		 * prob = 128, count = 0, update_factor = 0
+		 * Round2's argument: pre_prob * 256
+		 * (pre_prob * 256 + 128) >> 8 == pre_prob
+		 */
+		return pre_prob;
+	}
+
+	prob = clamp(((ct0 << 8) + (den >> 1)) / den, (u32)1, (u32)255);
+	count = min_t(u32, den, count_sat);
+	factor = fastdiv(max_update_factor * count, count_sat);
+
+	/*
+	 * Round2(pre_prob * (256 - factor) + prob * factor, 8)
+	 * Round2(pre_prob * 256 + (prob - pre_prob) * factor, 8)
+	 * (pre_prob * 256 >> 8) + (((prob - pre_prob) * factor + 128) >> 8)
+	 */
+	return pre_prob + (((prob - pre_prob) * factor + 128) >> 8);
+}
+
+static inline u8 noncoef_merge_prob(u8 pre_prob, u32 ct0, u32 ct1)
+{
+	return merge_prob(pre_prob, ct0, ct1, 20, 128);
+}
+
+/* 8.4.2 Merge probs process */
+/*
+ * merge_probs() is a recursive function in the spec. We avoid recursion in the kernel.
+ * That said, the "tree" parameter of merge_probs() controls how deep the recursion goes.
+ * It turns out that in all cases the recursive calls boil down to a short-ish series
+ * of merge_prob() invocations (note no "s").
+ *
+ * Variant A
+ * ---------
+ * merge_probs(small_token_tree, 2):
+ *	merge_prob(p[1], c[0], c[1] + c[2])
+ *	merge_prob(p[2], c[1], c[2])
+ *
+ * Variant B
+ * ---------
+ * merge_probs(binary_tree, 0) or
+ * merge_probs(tx_size_8_tree, 0):
+ *	merge_prob(p[0], c[0], c[1])
+ *
+ * Variant C
+ * ---------
+ * merge_probs(inter_mode_tree, 0):
+ *	merge_prob(p[0], c[2], c[1] + c[0] + c[3])
+ *	merge_prob(p[1], c[0], c[1] + c[3])
+ *	merge_prob(p[2], c[1], c[3])
+ *
+ * Variant D
+ * ---------
+ * merge_probs(intra_mode_tree, 0):
+ *	merge_prob(p[0], c[0], c[1] + ... + c[9])
+ *	merge_prob(p[1], c[9], c[1] + ... + c[8])
+ *	merge_prob(p[2], c[1], c[2] + ... + c[8])
+ *	merge_prob(p[3], c[2] + c[4] + c[5], c[3] + c[8] + c[6] + c[7])
+ *	merge_prob(p[4], c[2], c[4] + c[5])
+ *	merge_prob(p[5], c[4], c[5])
+ *	merge_prob(p[6], c[3], c[8] + c[6] + c[7])
+ *	merge_prob(p[7], c[8], c[6] + c[7])
+ *	merge_prob(p[8], c[6], c[7])
+ *
+ * Variant E
+ * ---------
+ * merge_probs(partition_tree, 0) or
+ * merge_probs(tx_size_32_tree, 0) or
+ * merge_probs(mv_joint_tree, 0) or
+ * merge_probs(mv_fr_tree, 0):
+ *	merge_prob(p[0], c[0], c[1] + c[2] + c[3])
+ *	merge_prob(p[1], c[1], c[2] + c[3])
+ *	merge_prob(p[2], c[2], c[3])
+ *
+ * Variant F
+ * ---------
+ * merge_probs(interp_filter_tree, 0) or
+ * merge_probs(tx_size_16_tree, 0):
+ *	merge_prob(p[0], c[0], c[1] + c[2])
+ *	merge_prob(p[1], c[1], c[2])
+ *
+ * Variant G
+ * ---------
+ * merge_probs(mv_class_tree, 0):
+ *	merge_prob(p[0], c[0], c[1] + ... + c[10])
+ *	merge_prob(p[1], c[1], c[2] + ... + c[10])
+ *	merge_prob(p[2], c[2] + c[3], c[4] + ... + c[10])
+ *	merge_prob(p[3], c[2], c[3])
+ *	merge_prob(p[4], c[4] + c[5], c[6] + ... + c[10])
+ *	merge_prob(p[5], c[4], c[5])
+ *	merge_prob(p[6], c[6], c[7] + ... + c[10])
+ *	merge_prob(p[7], c[7] + c[8], c[9] + c[10])
+ *	merge_prob(p[8], c[7], c[8])
+ *	merge_prob(p[9], c[9], [10])
+ */
+
+static inline void merge_probs_variant_a(u8 *p, const u32 *c, u16 count_sat, u32 update_factor)
+{
+	p[1] = merge_prob(p[1], c[0], c[1] + c[2], count_sat, update_factor);
+	p[2] = merge_prob(p[2], c[1], c[2], count_sat, update_factor);
+}
+
+static inline void merge_probs_variant_b(u8 *p, const u32 *c, u16 count_sat, u32 update_factor)
+{
+	p[0] = merge_prob(p[0], c[0], c[1], count_sat, update_factor);
+}
+
+static inline void merge_probs_variant_c(u8 *p, const u32 *c)
+{
+	p[0] = noncoef_merge_prob(p[0], c[2], c[1] + c[0] + c[3]);
+	p[1] = noncoef_merge_prob(p[1], c[0], c[1] + c[3]);
+	p[2] = noncoef_merge_prob(p[2], c[1], c[3]);
+}
+
+static void merge_probs_variant_d(u8 *p, const u32 *c)
+{
+	u32 sum = 0, s2;
+
+	sum = c[1] + c[2] + c[3] + c[4] + c[5] + c[6] + c[7] + c[8] + c[9];
+
+	p[0] = noncoef_merge_prob(p[0], c[0], sum);
+	sum -= c[9];
+	p[1] = noncoef_merge_prob(p[1], c[9], sum);
+	sum -= c[1];
+	p[2] = noncoef_merge_prob(p[2], c[1], sum);
+	s2 = c[2] + c[4] + c[5];
+	sum -= s2;
+	p[3] = noncoef_merge_prob(p[3], s2, sum);
+	s2 -= c[2];
+	p[4] = noncoef_merge_prob(p[4], c[2], s2);
+	p[5] = noncoef_merge_prob(p[5], c[4], c[5]);
+	sum -= c[3];
+	p[6] = noncoef_merge_prob(p[6], c[3], sum);
+	sum -= c[8];
+	p[7] = noncoef_merge_prob(p[7], c[8], sum);
+	p[8] = noncoef_merge_prob(p[8], c[6], c[7]);
+}
+
+static inline void merge_probs_variant_e(u8 *p, const u32 *c)
+{
+	p[0] = noncoef_merge_prob(p[0], c[0], c[1] + c[2] + c[3]);
+	p[1] = noncoef_merge_prob(p[1], c[1], c[2] + c[3]);
+	p[2] = noncoef_merge_prob(p[2], c[2], c[3]);
+}
+
+static inline void merge_probs_variant_f(u8 *p, const u32 *c)
+{
+	p[0] = noncoef_merge_prob(p[0], c[0], c[1] + c[2]);
+	p[1] = noncoef_merge_prob(p[1], c[1], c[2]);
+}
+
+static void merge_probs_variant_g(u8 *p, const u32 *c)
+{
+	u32 sum;
+
+	sum = c[1] + c[2] + c[3] + c[4] + c[5] + c[6] + c[7] + c[8] + c[9] + c[10];
+	p[0] = noncoef_merge_prob(p[0], c[0], sum);
+	sum -= c[1];
+	p[1] = noncoef_merge_prob(p[1], c[1], sum);
+	sum -= c[2] + c[3];
+	p[2] = noncoef_merge_prob(p[2], c[2] + c[3], sum);
+	p[3] = noncoef_merge_prob(p[3], c[2], c[3]);
+	sum -= c[4] + c[5];
+	p[4] = noncoef_merge_prob(p[4], c[4] + c[5], sum);
+	p[5] = noncoef_merge_prob(p[5], c[4], c[5]);
+	sum -= c[6];
+	p[6] = noncoef_merge_prob(p[6], c[6], sum);
+	p[7] = noncoef_merge_prob(p[7], c[7] + c[8], c[9] + c[10]);
+	p[8] = noncoef_merge_prob(p[8], c[7], c[8]);
+	p[9] = noncoef_merge_prob(p[9], c[9], c[10]);
+}
+
+/* 8.4.3 Coefficient probability adaptation process */
+static inline void adapt_probs_variant_a_coef(u8 *p, const u32 *c, u32 update_factor)
+{
+	merge_probs_variant_a(p, c, 24, update_factor);
+}
+
+static inline void adapt_probs_variant_b_coef(u8 *p, const u32 *c, u32 update_factor)
+{
+	merge_probs_variant_b(p, c, 24, update_factor);
+}
+
+static void _adapt_coeff(unsigned int i, unsigned int j, unsigned int k,
+			 struct v4l2_vp9_frame_context *probs,
+			 const struct v4l2_vp9_frame_symbol_counts *counts,
+			 u32 uf)
+{
+	s32 l, m;
+
+	for (l = 0; l < ARRAY_SIZE(probs->coef[0][0][0]); l++) {
+		for (m = 0; m < BAND_6(l); m++) {
+			u8 *p = probs->coef[i][j][k][l][m];
+			const u32 counts_more_coefs[2] = {
+				*counts->eob[i][j][k][l][m][1],
+				*counts->eob[i][j][k][l][m][0] - *counts->eob[i][j][k][l][m][1],
+			};
+
+			adapt_probs_variant_a_coef(p, *counts->coeff[i][j][k][l][m], uf);
+			adapt_probs_variant_b_coef(p, counts_more_coefs, uf);
+		}
+	}
+}
+
+static void _adapt_coef_probs(struct v4l2_vp9_frame_context *probs,
+			      const struct v4l2_vp9_frame_symbol_counts *counts,
+			      unsigned int uf)
+{
+	unsigned int i, j, k;
+
+	for (i = 0; i < ARRAY_SIZE(probs->coef); i++)
+		for (j = 0; j < ARRAY_SIZE(probs->coef[0]); j++)
+			for (k = 0; k < ARRAY_SIZE(probs->coef[0][0]); k++)
+				_adapt_coeff(i, j, k, probs, counts, uf);
+}
+
+void v4l2_vp9_adapt_coef_probs(struct v4l2_vp9_frame_context *probs,
+			       struct v4l2_vp9_frame_symbol_counts *counts,
+			       bool use_128,
+			       bool frame_is_intra)
+{
+	if (frame_is_intra) {
+		_adapt_coef_probs(probs, counts, 112);
+	} else {
+		if (use_128)
+			_adapt_coef_probs(probs, counts, 128);
+		else
+			_adapt_coef_probs(probs, counts, 112);
+	}
+}
+EXPORT_SYMBOL_GPL(v4l2_vp9_adapt_coef_probs);
+
+/* 8.4.4 Non coefficient probability adaptation process, adapt_probs() */
+static inline void adapt_probs_variant_b(u8 *p, const u32 *c)
+{
+	merge_probs_variant_b(p, c, 20, 128);
+}
+
+static inline void adapt_probs_variant_c(u8 *p, const u32 *c)
+{
+	merge_probs_variant_c(p, c);
+}
+
+static inline void adapt_probs_variant_d(u8 *p, const u32 *c)
+{
+	merge_probs_variant_d(p, c);
+}
+
+static inline void adapt_probs_variant_e(u8 *p, const u32 *c)
+{
+	merge_probs_variant_e(p, c);
+}
+
+static inline void adapt_probs_variant_f(u8 *p, const u32 *c)
+{
+	merge_probs_variant_f(p, c);
+}
+
+static inline void adapt_probs_variant_g(u8 *p, const u32 *c)
+{
+	merge_probs_variant_g(p, c);
+}
+
+/* 8.4.4 Non coefficient probability adaptation process, adapt_prob() */
+static inline u8 adapt_prob(u8 prob, const u32 counts[2])
+{
+	return noncoef_merge_prob(prob, counts[0], counts[1]);
+}
+
+/* 8.4.4 Non coefficient probability adaptation process */
+void v4l2_vp9_adapt_noncoef_probs(struct v4l2_vp9_frame_context *probs,
+				  struct v4l2_vp9_frame_symbol_counts *counts,
+				  u8 reference_mode, u8 interpolation_filter, u8 tx_mode,
+				  u32 flags)
+{
+	unsigned int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(probs->is_inter); i++)
+		probs->is_inter[i] = adapt_prob(probs->is_inter[i], (*counts->intra_inter)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->comp_mode); i++)
+		probs->comp_mode[i] = adapt_prob(probs->comp_mode[i], (*counts->comp)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->comp_ref); i++)
+		probs->comp_ref[i] = adapt_prob(probs->comp_ref[i], (*counts->comp_ref)[i]);
+
+	if (reference_mode != V4L2_VP9_REFERENCE_MODE_COMPOUND_REFERENCE)
+		for (i = 0; i < ARRAY_SIZE(probs->single_ref); i++)
+			for (j = 0; j < ARRAY_SIZE(probs->single_ref[0]); j++)
+				probs->single_ref[i][j] = adapt_prob(probs->single_ref[i][j],
+								     (*counts->single_ref)[i][j]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->inter_mode); i++)
+		adapt_probs_variant_c(probs->inter_mode[i], (*counts->mv_mode)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->y_mode); i++)
+		adapt_probs_variant_d(probs->y_mode[i], (*counts->y_mode)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->uv_mode); i++)
+		adapt_probs_variant_d(probs->uv_mode[i], (*counts->uv_mode)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->partition); i++)
+		adapt_probs_variant_e(probs->partition[i], (*counts->partition)[i]);
+
+	for (i = 0; i < ARRAY_SIZE(probs->skip); i++)
+		probs->skip[i] = adapt_prob(probs->skip[i], (*counts->skip)[i]);
+
+	if (interpolation_filter == V4L2_VP9_INTERP_FILTER_SWITCHABLE)
+		for (i = 0; i < ARRAY_SIZE(probs->interp_filter); i++)
+			adapt_probs_variant_f(probs->interp_filter[i], (*counts->filter)[i]);
+
+	if (tx_mode == V4L2_VP9_TX_MODE_SELECT)
+		for (i = 0; i < ARRAY_SIZE(probs->tx8); i++) {
+			adapt_probs_variant_b(probs->tx8[i], (*counts->tx8p)[i]);
+			adapt_probs_variant_f(probs->tx16[i], (*counts->tx16p)[i]);
+			adapt_probs_variant_e(probs->tx32[i], (*counts->tx32p)[i]);
+		}
+
+	adapt_probs_variant_e(probs->mv.joint, *counts->mv_joint);
+
+	for (i = 0; i < ARRAY_SIZE(probs->mv.sign); i++) {
+		probs->mv.sign[i] = adapt_prob(probs->mv.sign[i], (*counts->sign)[i]);
+
+		adapt_probs_variant_g(probs->mv.classes[i], (*counts->classes)[i]);
+
+		probs->mv.class0_bit[i] = adapt_prob(probs->mv.class0_bit[i], (*counts->class0)[i]);
+
+		for (j = 0; j < ARRAY_SIZE(probs->mv.bits[0]); j++)
+			probs->mv.bits[i][j] = adapt_prob(probs->mv.bits[i][j],
+							  (*counts->bits)[i][j]);
+
+		for (j = 0; j < ARRAY_SIZE(probs->mv.class0_fr[0]); j++)
+			adapt_probs_variant_e(probs->mv.class0_fr[i][j],
+					      (*counts->class0_fp)[i][j]);
+
+		adapt_probs_variant_e(probs->mv.fr[i], (*counts->fp)[i]);
+
+		if (!(flags & V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV))
+			continue;
+
+		probs->mv.class0_hp[i] = adapt_prob(probs->mv.class0_hp[i],
+						    (*counts->class0_hp)[i]);
+
+		probs->mv.hp[i] = adapt_prob(probs->mv.hp[i], (*counts->hp)[i]);
+	}
+}
+EXPORT_SYMBOL_GPL(v4l2_vp9_adapt_noncoef_probs);
+
+bool
+v4l2_vp9_seg_feat_enabled(const u8 *feature_enabled,
+			  enum v4l2_vp9_segment_feature feature,
+			  unsigned int segid)
+{
+	u8 mask = V4L2_VP9_SEGMENT_FEATURE_ENABLED(feature);
+
+	return !!(feature_enabled[segid] & mask);
+}
+EXPORT_SYMBOL_GPL(v4l2_vp9_seg_feat_enabled);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("V4L2 VP9 Helpers");
+MODULE_AUTHOR("Andrzej Pietrasiewicz <andrzej.p@collabora.com>");
diff --git a/include/media/v4l2-vp9.h b/include/media/v4l2-vp9.h
new file mode 100644
index 000000000000..4ec16a482191
--- /dev/null
+++ b/include/media/v4l2-vp9.h
@@ -0,0 +1,182 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Helper functions for vp9 codecs.
+ *
+ * Copyright (c) 2021 Collabora, Ltd.
+ *
+ * Author: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
+ */
+
+#ifndef _MEDIA_V4L2_VP9_H
+#define _MEDIA_V4L2_VP9_H
+
+#include <media/v4l2-ctrls.h>
+
+/**
+ * struct v4l2_vp9_frame_mv_context - motion vector-related probabilities
+ *
+ * A member of v4l2_vp9_frame_context.
+ */
+struct v4l2_vp9_frame_mv_context {
+	u8 joint[3];
+	u8 sign[2];
+	u8 classes[2][10];
+	u8 class0_bit[2];
+	u8 bits[2][10];
+	u8 class0_fr[2][2][3];
+	u8 fr[2][3];
+	u8 class0_hp[2];
+	u8 hp[2];
+};
+
+/**
+ * struct v4l2_vp9_frame_context - frame probabilities, including motion-vector related
+ *
+ * Drivers which need to keep track of frame context(s) can use this struct.
+ * The members correspond to probability tables, which are specified only implicitly in the
+ * vp9 spec. Section 10.5 "Default probability tables" contains all the types of involved
+ * tables, i.e. the actual tables are of the same kind, and when they are reset (which is
+ * mandated by the spec sometimes) they are overwritten with values from the default tables.
+ */
+struct v4l2_vp9_frame_context {
+	u8 tx8[2][1];
+	u8 tx16[2][2];
+	u8 tx32[2][3];
+	u8 coef[4][2][2][6][6][3];
+	u8 skip[3];
+	u8 inter_mode[7][3];
+	u8 interp_filter[4][2];
+	u8 is_inter[4];
+	u8 comp_mode[5];
+	u8 single_ref[5][2];
+	u8 comp_ref[5];
+	u8 y_mode[4][9];
+	u8 uv_mode[10][9];
+	u8 partition[16][3];
+
+	struct v4l2_vp9_frame_mv_context mv;
+};
+
+/**
+ * struct v4l2_vp9_frame_symbol_counts - pointers to arrays of symbol counts
+ *
+ * The fields correspond to what is specified in section 8.3 "Clear counts process" of the spec.
+ * Different pieces of hardware can report the counts in different order, so we cannot rely on
+ * simply overlaying a struct on a relevant block of memory. Instead we provide pointers to
+ * arrays or array of pointers to arrays in case of coeff, or array of pointers for eob.
+ */
+struct v4l2_vp9_frame_symbol_counts {
+	u32 (*partition)[16][4];
+	u32 (*skip)[3][2];
+	u32 (*intra_inter)[4][2];
+	u32 (*tx32p)[2][4];
+	u32 (*tx16p)[2][4];
+	u32 (*tx8p)[2][2];
+	u32 (*y_mode)[4][10];
+	u32 (*uv_mode)[10][10];
+	u32 (*comp)[5][2];
+	u32 (*comp_ref)[5][2];
+	u32 (*single_ref)[5][2][2];
+	u32 (*mv_mode)[7][4];
+	u32 (*filter)[4][3];
+	u32 (*mv_joint)[4];
+	u32 (*sign)[2][2];
+	u32 (*classes)[2][11];
+	u32 (*class0)[2][2];
+	u32 (*bits)[2][10][2];
+	u32 (*class0_fp)[2][2][4];
+	u32 (*fp)[2][4];
+	u32 (*class0_hp)[2][2];
+	u32 (*hp)[2][2];
+	u32 (*coeff[4][2][2][6][6])[3];
+	u32 *eob[4][2][2][6][6][2];
+};
+
+extern const u8 v4l2_vp9_kf_y_mode_prob[10][10][9]; /* Section 10.4 of the spec */
+extern const u8 v4l2_vp9_kf_partition_probs[16][3]; /* Section 10.4 of the spec */
+extern const u8 v4l2_vp9_kf_uv_mode_prob[10][9]; /* Section 10.4 of the spec */
+extern const struct v4l2_vp9_frame_context v4l2_vp9_default_probs; /* Section 10.5 of the spec */
+
+/**
+ * v4l2_vp9_fw_update_probs() - Perform forward update of vp9 probabilities
+ *
+ * @probs: current probabilities values
+ * @deltas: delta values from compressed header
+ * @dec_params: vp9 frame decoding parameters
+ *
+ * This function performs forward updates of probabilities for the vp9 boolean decoder.
+ * The frame header can contain a directive to update the probabilities (deltas), if so, then
+ * the deltas are provided in the header, too. The userspace parses those and passes the said
+ * deltas struct to the kernel.
+ */
+void v4l2_vp9_fw_update_probs(struct v4l2_vp9_frame_context *probs,
+			      const struct v4l2_ctrl_vp9_compressed_hdr *deltas,
+			      const struct v4l2_ctrl_vp9_frame *dec_params);
+
+/**
+ * v4l2_vp9_reset_frame_ctx() - Reset appropriate frame context
+ *
+ * @dec_params: vp9 frame decoding parameters
+ * @frame_context: array of the 4 frame contexts
+ *
+ * This function resets appropriate frame contexts, based on what's in dec_params.
+ *
+ * Returns the frame context index after the update, which might be reset to zero if
+ * mandated by the spec.
+ */
+u8 v4l2_vp9_reset_frame_ctx(const struct v4l2_ctrl_vp9_frame *dec_params,
+			    struct v4l2_vp9_frame_context *frame_context);
+
+/**
+ * v4l2_vp9_adapt_coef_probs() - Perform backward update of vp9 coefficients probabilities
+ *
+ * @probs: current probabilities values
+ * @counts: values of symbol counts after the current frame has been decoded
+ * @use_128: flag to request that 128 is used as update factor if true, otherwise 112 is used
+ * @frame_is_intra: flag indicating that FrameIsIntra is true
+ *
+ * This function performs backward updates of coefficients probabilities for the vp9 boolean
+ * decoder. After a frame has been decoded the counts of how many times a given symbol has
+ * occurred are known and are used to update the probability of each symbol.
+ */
+void v4l2_vp9_adapt_coef_probs(struct v4l2_vp9_frame_context *probs,
+			       struct v4l2_vp9_frame_symbol_counts *counts,
+			       bool use_128,
+			       bool frame_is_intra);
+
+/**
+ * v4l2_vp9_adapt_coef_probs() - Perform backward update of vp9 non-coefficients probabilities
+ *
+ * @probs: current probabilities values
+ * @counts: values of symbol counts after the current frame has been decoded
+ * @reference_mode: specifies the type of inter prediction to be used. See
+ *	&v4l2_vp9_reference_mode for more details
+ * @interpolation_filter: specifies the filter selection used for performing inter prediction.
+ *	See &v4l2_vp9_interpolation_filter for more details
+ * @tx_mode: specifies the TX mode. See &v4l2_vp9_tx_mode for more details
+ * @flags: combination of V4L2_VP9_FRAME_FLAG_* flags
+ *
+ * This function performs backward updates of non-coefficients probabilities for the vp9 boolean
+ * decoder. After a frame has been decoded the counts of how many times a given symbol has
+ * occurred are known and are used to update the probability of each symbol.
+ */
+void v4l2_vp9_adapt_noncoef_probs(struct v4l2_vp9_frame_context *probs,
+				  struct v4l2_vp9_frame_symbol_counts *counts,
+				  u8 reference_mode, u8 interpolation_filter, u8 tx_mode,
+				  u32 flags);
+
+/**
+ * v4l2_vp9_seg_feat_enabled() - Check if a segmentation feature is enabled
+ *
+ * @feature_enabled: array of 8-bit flags (for all segments)
+ * @feature: id of the feature to check
+ * @segid: id of the segment to look up
+ *
+ * This function returns true if a given feature is active in a given segment.
+ */
+bool
+v4l2_vp9_seg_feat_enabled(const u8 *feature_enabled,
+			  enum v4l2_vp9_segment_feature feature,
+			  unsigned int segid);
+
+#endif /* _MEDIA_V4L2_VP9_H */
