--- /dev/null
+/* SPDX-License-Identifier: MIT
+ * Copyright (C) 2018 Intel Corp.
+ *
+ * Authors:
+ * Manasi Navare <manasi.d.navare@intel.com>
+ */
+
+#ifndef DRM_DSC_H_
+#define DRM_DSC_H_
+
+#include <drm/drm_dp_helper.h>
+
+/* VESA Display Stream Compression DSC 1.2 constants */
+#define DSC_NUM_BUF_RANGES 15
+
+/**
+ * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
+ *
+ * The VESA DSC standard defines picture parameter set (PPS) which display
+ * stream compression encoders must communicate to decoders.
+ * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
+ * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
+ * The PPS fields that span over more than a byte should be stored in Big Endian
+ * format.
+ */
+struct drm_dsc_picture_parameter_set {
+ /**
+ * @dsc_version:
+ * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
+ * PPS0[7:4] - dsc_version_major: Contains major version of DSC
+ */
+ u8 dsc_version;
+ /**
+ * @pps_identifier:
+ * PPS1[7:0] - Application specific identifier that can be
+ * used to differentiate between different PPS tables.
+ */
+ u8 pps_identifier;
+ /**
+ * @pps_reserved:
+ * PPS2[7:0]- RESERVED Byte
+ */
+ u8 pps_reserved;
+ /**
+ * @pps_3:
+ * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
+ * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
+ * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
+ * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
+ * PPS3[7:4] - bits_per_component: Bits per component for the original
+ * pixels of the encoded picture.
+ * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
+ * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
+ * allowed only when dsc_minor_version = 0x2)
+ */
+ u8 pps_3;
+ /**
+ * @pps_4:
+ * PPS4[1:0] -These are the most significant 2 bits of
+ * compressed BPP bits_per_pixel[9:0] syntax element.
+ * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
+ * PPS4[3] - simple_422: Indicates if decoder drops samples to
+ * reconstruct the 4:2:2 picture.
+ * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
+ * active.
+ * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
+ * groups in picture
+ * PPS4[7:6] - Reseved bits
+ */
+ u8 pps_4;
+ /**
+ * @bits_per_pixel_low:
+ * PPS5[7:0] - This indicates the lower significant 8 bits of
+ * the compressed BPP bits_per_pixel[9:0] element.
+ */
+ u8 bits_per_pixel_low;
+ /**
+ * @pic_height:
+ * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
+ * within the raster.
+ */
+ __be16 pic_height;
+ /**
+ * @pic_width:
+ * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
+ * the raster.
+ */
+ __be16 pic_width;
+ /**
+ * @slice_height:
+ * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
+ */
+ __be16 slice_height;
+ /**
+ * @slice_width:
+ * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
+ */
+ __be16 slice_width;
+ /**
+ * @chunk_size:
+ * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
+ * that are used for slice multiplexing.
+ */
+ __be16 chunk_size;
+ /**
+ * @initial_xmit_delay_high:
+ * PPS16[1:0] - Most Significant two bits of initial transmission delay.
+ * It specifies the number of pixel times that the encoder waits before
+ * transmitting data from its rate buffer.
+ * PPS16[7:2] - Reserved
+ */
+ u8 initial_xmit_delay_high;
+ /**
+ * @initial_xmit_delay_low:
+ * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
+ */
+ u8 initial_xmit_delay_low;
+ /**
+ * @initial_dec_delay:
+ *
+ * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
+ * of pixel times that the decoder accumulates data in its rate buffer
+ * before starting to decode and output pixels.
+ */
+ __be16 initial_dec_delay;
+ /**
+ * @pps20_reserved:
+ *
+ * PPS20[7:0] - Reserved
+ */
+ u8 pps20_reserved;
+ /**
+ * @initial_scale_value:
+ * PPS21[5:0] - Initial rcXformScale factor used at beginning
+ * of a slice.
+ * PPS21[7:6] - Reserved
+ */
+ u8 initial_scale_value;
+ /**
+ * @scale_increment_interval:
+ * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
+ * the rcXformScale factor at end of a slice.
+ */
+ __be16 scale_increment_interval;
+ /**
+ * @scale_decrement_interval_high:
+ * PPS24[3:0] - Higher 4 bits indicating number of group times between
+ * decrementing the rcXformScale factor at beginning of a slice.
+ * PPS24[7:4] - Reserved
+ */
+ u8 scale_decrement_interval_high;
+ /**
+ * @scale_decrement_interval_low:
+ * PPS25[7:0] - Lower 8 bits of scale decrement interval
+ */
+ u8 scale_decrement_interval_low;
+ /**
+ * @pps26_reserved:
+ * PPS26[7:0]
+ */
+ u8 pps26_reserved;
+ /**
+ * @first_line_bpg_offset:
+ * PPS27[4:0] - Number of additional bits that are allocated
+ * for each group on first line of a slice.
+ * PPS27[7:5] - Reserved
+ */
+ u8 first_line_bpg_offset;
+ /**
+ * @nfl_bpg_offset:
+ * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
+ * deallocated for each group for groups after the first line of slice.
+ */
+ __be16 nfl_bpg_offset;
+ /**
+ * @slice_bpg_offset:
+ * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
+ * group to enforce the slice constraint.
+ */
+ __be16 slice_bpg_offset;
+ /**
+ * @initial_offset:
+ * PPS32,33[7:0] - Initial value for rcXformOffset
+ */
+ __be16 initial_offset;
+ /**
+ * @final_offset:
+ * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
+ */
+ __be16 final_offset;
+ /**
+ * @flatness_min_qp:
+ * PPS36[4:0] - Minimum QP at which flatness is signaled and
+ * flatness QP adjustment is made.
+ * PPS36[7:5] - Reserved
+ */
+ u8 flatness_min_qp;
+ /**
+ * @flatness_max_qp:
+ * PPS37[4:0] - Max QP at which flatness is signalled and
+ * the flatness adjustment is made.
+ * PPS37[7:5] - Reserved
+ */
+ u8 flatness_max_qp;
+ /**
+ * @rc_model_size:
+ * PPS38,39[7:0] - Number of bits within RC Model.
+ */
+ __be16 rc_model_size;
+ /**
+ * @rc_edge_factor:
+ * PPS40[3:0] - Ratio of current activity vs, previous
+ * activity to determine presence of edge.
+ * PPS40[7:4] - Reserved
+ */
+ u8 rc_edge_factor;
+ /**
+ * @rc_quant_incr_limit0:
+ * PPS41[4:0] - QP threshold used in short term RC
+ * PPS41[7:5] - Reserved
+ */
+ u8 rc_quant_incr_limit0;
+ /**
+ * @rc_quant_incr_limit1:
+ * PPS42[4:0] - QP threshold used in short term RC
+ * PPS42[7:5] - Reserved
+ */
+ u8 rc_quant_incr_limit1;
+ /**
+ * @rc_tgt_offset:
+ * PPS43[3:0] - Lower end of the variability range around the target
+ * bits per group that is allowed by short term RC.
+ * PPS43[7:4]- Upper end of the variability range around the target
+ * bits per group that i allowed by short term rc.
+ */
+ u8 rc_tgt_offset;
+ /**
+ * @rc_buf_thresh:
+ * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
+ * the 15 ranges defined by 14 thresholds.
+ */
+ u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
+ /**
+ * @rc_range_parameters:
+ * PPS58[7:0] - PPS87[7:0]
+ * Parameters that correspond to each of the 15 ranges.
+ */
+ __be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
+ /**
+ * @native_422_420:
+ * PPS88[0] - 0 = Native 4:2:2 not used
+ * 1 = Native 4:2:2 used
+ * PPS88[1] - 0 = Native 4:2:0 not use
+ * 1 = Native 4:2:0 used
+ * PPS88[7:2] - Reserved 6 bits
+ */
+ u8 native_422_420;
+ /**
+ * @second_line_bpg_offset:
+ * PPS89[4:0] - Additional bits/group budget for the
+ * second line of a slice in Native 4:2:0 mode.
+ * Set to 0 if DSC minor version is 1 or native420 is 0.
+ * PPS89[7:5] - Reserved
+ */
+ u8 second_line_bpg_offset;
+ /**
+ * @nsl_bpg_offset:
+ * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
+ * for each group that is not in the second line of a slice.
+ */
+ __be16 nsl_bpg_offset;
+ /**
+ * @second_line_offset_adj:
+ * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
+ * line in Native 4:2:0 mode.
+ */
+ __be16 second_line_offset_adj;
+ /**
+ * @pps_long_94_reserved:
+ * PPS 94, 95, 96, 97 - Reserved
+ */
+ u32 pps_long_94_reserved;
+ /**
+ * @pps_long_98_reserved:
+ * PPS 98, 99, 100, 101 - Reserved
+ */
+ u32 pps_long_98_reserved;
+ /**
+ * @pps_long_102_reserved:
+ * PPS 102, 103, 104, 105 - Reserved
+ */
+ u32 pps_long_102_reserved;
+ /**
+ * @pps_long_106_reserved:
+ * PPS 106, 107, 108, 109 - reserved
+ */
+ u32 pps_long_106_reserved;
+ /**
+ * @pps_long_110_reserved:
+ * PPS 110, 111, 112, 113 - reserved
+ */
+ u32 pps_long_110_reserved;
+ /**
+ * @pps_long_114_reserved:
+ * PPS 114 - 117 - reserved
+ */
+ u32 pps_long_114_reserved;
+ /**
+ * @pps_long_118_reserved:
+ * PPS 118 - 121 - reserved
+ */
+ u32 pps_long_118_reserved;
+ /**
+ * @pps_long_122_reserved:
+ * PPS 122- 125 - reserved
+ */
+ u32 pps_long_122_reserved;
+ /**
+ * @pps_short_126_reserved:
+ * PPS 126, 127 - reserved
+ */
+ __be16 pps_short_126_reserved;
+} __packed;
+
+/**
+ * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
+ * Set Metadata
+ *
+ * This structure represents the DSC PPS infoframe required to send the Picture
+ * Parameter Set metadata required before enabling VESA Display Stream
+ * Compression. This is based on the DP Secondary Data Packet structure and
+ * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
+ *
+ * @pps_header: Header for PPS as per DP SDP header format
+ * @pps_payload: PPS payload fields as per DSC specification Table 4-1
+ */
+struct drm_dsc_pps_infoframe {
+ struct dp_sdp_header pps_header;
+ struct drm_dsc_picture_parameter_set pps_payload;
+} __packed;
+
+#endif /* _DRM_DSC_H_ */
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