// SPDX-License-Identifier: GPL-2.0
/*
 * Hantro VPU HEVC codec driver
 *
 * Copyright (C) 2020 Safran Passenger Innovations LLC
 */

#include "hantro_hw.h"
#include "hantro_g2_regs.h"

static void prepare_tile_info_buffer(struct hantro_ctx *ctx)
{
        struct hantro_dev *vpu = ctx->dev;
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        const struct v4l2_ctrl_hevc_pps *pps = ctrls->pps;
        const struct v4l2_ctrl_hevc_sps *sps = ctrls->sps;
        u16 *p = (u16 *)((u8 *)ctx->hevc_dec.tile_sizes.cpu);
        unsigned int num_tile_rows = pps->num_tile_rows_minus1 + 1;
        unsigned int num_tile_cols = pps->num_tile_columns_minus1 + 1;
        unsigned int pic_width_in_ctbs, pic_height_in_ctbs;
        unsigned int max_log2_ctb_size, ctb_size;
        bool tiles_enabled, uniform_spacing;
        u32 no_chroma = 0;

        tiles_enabled = !!(pps->flags & V4L2_HEVC_PPS_FLAG_TILES_ENABLED);
        uniform_spacing = !!(pps->flags & V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING);

        hantro_reg_write(vpu, &g2_tile_e, tiles_enabled);

        max_log2_ctb_size = sps->log2_min_luma_coding_block_size_minus3 + 3 +
                            sps->log2_diff_max_min_luma_coding_block_size;
        pic_width_in_ctbs = (sps->pic_width_in_luma_samples +
                            (1 << max_log2_ctb_size) - 1) >> max_log2_ctb_size;
        pic_height_in_ctbs = (sps->pic_height_in_luma_samples + (1 << max_log2_ctb_size) - 1)
                             >> max_log2_ctb_size;
        ctb_size = 1 << max_log2_ctb_size;

        vpu_debug(1, "Preparing tile sizes buffer for %dx%d CTBs (CTB size %d)\n",
                  pic_width_in_ctbs, pic_height_in_ctbs, ctb_size);

        if (tiles_enabled) {
                unsigned int i, j, h;

                vpu_debug(1, "Tiles enabled! %dx%d\n", num_tile_cols, num_tile_rows);

                hantro_reg_write(vpu, &g2_num_tile_rows, num_tile_rows);
                hantro_reg_write(vpu, &g2_num_tile_cols, num_tile_cols);

                /* write width + height for each tile in pic */
                if (!uniform_spacing) {
                        u32 tmp_w = 0, tmp_h = 0;

                        for (i = 0; i < num_tile_rows; i++) {
                                if (i == num_tile_rows - 1)
                                        h = pic_height_in_ctbs - tmp_h;
                                else
                                        h = pps->row_height_minus1[i] + 1;
                                tmp_h += h;
                                if (i == 0 && h == 1 && ctb_size == 16)
                                        no_chroma = 1;
                                for (j = 0, tmp_w = 0; j < num_tile_cols - 1; j++) {
                                        tmp_w += pps->column_width_minus1[j] + 1;
                                        *p++ = pps->column_width_minus1[j] + 1;
                                        *p++ = h;
                                        if (i == 0 && h == 1 && ctb_size == 16)
                                                no_chroma = 1;
                                }
                                /* last column */
                                *p++ = pic_width_in_ctbs - tmp_w;
                                *p++ = h;
                        }
                } else { /* uniform spacing */
                        u32 tmp, prev_h, prev_w;

                        for (i = 0, prev_h = 0; i < num_tile_rows; i++) {
                                tmp = (i + 1) * pic_height_in_ctbs / num_tile_rows;
                                h = tmp - prev_h;
                                prev_h = tmp;
                                if (i == 0 && h == 1 && ctb_size == 16)
                                        no_chroma = 1;
                                for (j = 0, prev_w = 0; j < num_tile_cols; j++) {
                                        tmp = (j + 1) * pic_width_in_ctbs / num_tile_cols;
                                        *p++ = tmp - prev_w;
                                        *p++ = h;
                                        if (j == 0 &&
                                            (pps->column_width_minus1[0] + 1) == 1 &&
                                            ctb_size == 16)
                                                no_chroma = 1;
                                        prev_w = tmp;
                                }
                        }
                }
        } else {
                hantro_reg_write(vpu, &g2_num_tile_rows, 1);
                hantro_reg_write(vpu, &g2_num_tile_cols, 1);

                /* There's one tile, with dimensions equal to pic size. */
                p[0] = pic_width_in_ctbs;
                p[1] = pic_height_in_ctbs;
        }

        if (no_chroma)
                vpu_debug(1, "%s: no chroma!\n", __func__);
}

static int compute_header_skip_length(struct hantro_ctx *ctx)
{
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        const struct v4l2_ctrl_hevc_decode_params *decode_params = ctrls->decode_params;
        const struct v4l2_ctrl_hevc_sps *sps = ctrls->sps;
        const struct v4l2_ctrl_hevc_pps *pps = ctrls->pps;
        int skip = 0;

        if (pps->flags & V4L2_HEVC_PPS_FLAG_OUTPUT_FLAG_PRESENT)
                /* size of pic_output_flag */
                skip++;

        if (sps->flags & V4L2_HEVC_SPS_FLAG_SEPARATE_COLOUR_PLANE)
                /* size of pic_order_cnt_lsb */
                skip += 2;

        if (!(decode_params->flags & V4L2_HEVC_DECODE_PARAM_FLAG_IDR_PIC)) {
                /* size of pic_order_cnt_lsb */
                skip += sps->log2_max_pic_order_cnt_lsb_minus4 + 4;

                /* size of short_term_ref_pic_set_sps_flag */
                skip++;

                if (decode_params->short_term_ref_pic_set_size)
                        /* size of st_ref_pic_set( num_short_term_ref_pic_sets ) */
                        skip += decode_params->short_term_ref_pic_set_size;
                else if (sps->num_short_term_ref_pic_sets > 1)
                        skip += fls(sps->num_short_term_ref_pic_sets - 1);

                skip += decode_params->long_term_ref_pic_set_size;
        }

        return skip;
}

static void set_params(struct hantro_ctx *ctx)
{
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        const struct v4l2_ctrl_hevc_sps *sps = ctrls->sps;
        const struct v4l2_ctrl_hevc_pps *pps = ctrls->pps;
        const struct v4l2_ctrl_hevc_decode_params *decode_params = ctrls->decode_params;
        struct hantro_dev *vpu = ctx->dev;
        u32 min_log2_cb_size, max_log2_ctb_size, min_cb_size, max_ctb_size;
        u32 pic_width_in_min_cbs, pic_height_in_min_cbs;
        u32 pic_width_aligned, pic_height_aligned;
        u32 partial_ctb_x, partial_ctb_y;

        hantro_reg_write(vpu, &g2_bit_depth_y_minus8, sps->bit_depth_luma_minus8);
        hantro_reg_write(vpu, &g2_bit_depth_c_minus8, sps->bit_depth_chroma_minus8);

        hantro_reg_write(vpu, &g2_hdr_skip_length, compute_header_skip_length(ctx));

        min_log2_cb_size = sps->log2_min_luma_coding_block_size_minus3 + 3;
        max_log2_ctb_size = min_log2_cb_size + sps->log2_diff_max_min_luma_coding_block_size;

        hantro_reg_write(vpu, &g2_min_cb_size, min_log2_cb_size);
        hantro_reg_write(vpu, &g2_max_cb_size, max_log2_ctb_size);

        min_cb_size = 1 << min_log2_cb_size;
        max_ctb_size = 1 << max_log2_ctb_size;

        pic_width_in_min_cbs = sps->pic_width_in_luma_samples / min_cb_size;
        pic_height_in_min_cbs = sps->pic_height_in_luma_samples / min_cb_size;
        pic_width_aligned = ALIGN(sps->pic_width_in_luma_samples, max_ctb_size);
        pic_height_aligned = ALIGN(sps->pic_height_in_luma_samples, max_ctb_size);

        partial_ctb_x = !!(sps->pic_width_in_luma_samples != pic_width_aligned);
        partial_ctb_y = !!(sps->pic_height_in_luma_samples != pic_height_aligned);

        hantro_reg_write(vpu, &g2_partial_ctb_x, partial_ctb_x);
        hantro_reg_write(vpu, &g2_partial_ctb_y, partial_ctb_y);

        hantro_reg_write(vpu, &g2_pic_width_in_cbs, pic_width_in_min_cbs);
        hantro_reg_write(vpu, &g2_pic_height_in_cbs, pic_height_in_min_cbs);

        hantro_reg_write(vpu, &g2_pic_width_4x4,
                         (pic_width_in_min_cbs * min_cb_size) / 4);
        hantro_reg_write(vpu, &g2_pic_height_4x4,
                         (pic_height_in_min_cbs * min_cb_size) / 4);

        hantro_reg_write(vpu, &hevc_max_inter_hierdepth,
                         sps->max_transform_hierarchy_depth_inter);
        hantro_reg_write(vpu, &hevc_max_intra_hierdepth,
                         sps->max_transform_hierarchy_depth_intra);
        hantro_reg_write(vpu, &hevc_min_trb_size,
                         sps->log2_min_luma_transform_block_size_minus2 + 2);
        hantro_reg_write(vpu, &hevc_max_trb_size,
                         sps->log2_min_luma_transform_block_size_minus2 + 2 +
                         sps->log2_diff_max_min_luma_transform_block_size);

        hantro_reg_write(vpu, &g2_tempor_mvp_e,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_SPS_TEMPORAL_MVP_ENABLED) &&
                         !(decode_params->flags & V4L2_HEVC_DECODE_PARAM_FLAG_IDR_PIC));
        hantro_reg_write(vpu, &g2_strong_smooth_e,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_STRONG_INTRA_SMOOTHING_ENABLED));
        hantro_reg_write(vpu, &g2_asym_pred_e,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_AMP_ENABLED));
        hantro_reg_write(vpu, &g2_sao_e,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_SAMPLE_ADAPTIVE_OFFSET));
        hantro_reg_write(vpu, &g2_sign_data_hide,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_SIGN_DATA_HIDING_ENABLED));

        if (pps->flags & V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED) {
                hantro_reg_write(vpu, &g2_cu_qpd_e, 1);
                hantro_reg_write(vpu, &g2_max_cu_qpd_depth, pps->diff_cu_qp_delta_depth);
        } else {
                hantro_reg_write(vpu, &g2_cu_qpd_e, 0);
                hantro_reg_write(vpu, &g2_max_cu_qpd_depth, 0);
        }

        hantro_reg_write(vpu, &g2_cb_qp_offset, pps->pps_cb_qp_offset);
        hantro_reg_write(vpu, &g2_cr_qp_offset, pps->pps_cr_qp_offset);

        hantro_reg_write(vpu, &g2_filt_offset_beta, pps->pps_beta_offset_div2);
        hantro_reg_write(vpu, &g2_filt_offset_tc, pps->pps_tc_offset_div2);
        hantro_reg_write(vpu, &g2_slice_hdr_ext_e,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_SLICE_SEGMENT_HEADER_EXTENSION_PRESENT));
        hantro_reg_write(vpu, &g2_slice_hdr_ext_bits, pps->num_extra_slice_header_bits);
        hantro_reg_write(vpu, &g2_slice_chqp_present,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_PPS_SLICE_CHROMA_QP_OFFSETS_PRESENT));
        hantro_reg_write(vpu, &g2_weight_bipr_idc,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_WEIGHTED_BIPRED));
        hantro_reg_write(vpu, &g2_transq_bypass,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_TRANSQUANT_BYPASS_ENABLED));
        hantro_reg_write(vpu, &g2_list_mod_e,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_LISTS_MODIFICATION_PRESENT));
        hantro_reg_write(vpu, &g2_entropy_sync_e,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_ENTROPY_CODING_SYNC_ENABLED));
        hantro_reg_write(vpu, &g2_cabac_init_present,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_CABAC_INIT_PRESENT));
        hantro_reg_write(vpu, &g2_idr_pic_e,
                         !!(decode_params->flags & V4L2_HEVC_DECODE_PARAM_FLAG_IRAP_PIC));
        hantro_reg_write(vpu, &hevc_parallel_merge,
                         pps->log2_parallel_merge_level_minus2 + 2);
        hantro_reg_write(vpu, &g2_pcm_filt_d,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_PCM_LOOP_FILTER_DISABLED));
        hantro_reg_write(vpu, &g2_pcm_e,
                         !!(sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED));
        if (sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED) {
                hantro_reg_write(vpu, &g2_max_pcm_size,
                                 sps->log2_diff_max_min_pcm_luma_coding_block_size +
                                 sps->log2_min_pcm_luma_coding_block_size_minus3 + 3);
                hantro_reg_write(vpu, &g2_min_pcm_size,
                                 sps->log2_min_pcm_luma_coding_block_size_minus3 + 3);
                hantro_reg_write(vpu, &g2_bit_depth_pcm_y,
                                 sps->pcm_sample_bit_depth_luma_minus1 + 1);
                hantro_reg_write(vpu, &g2_bit_depth_pcm_c,
                                 sps->pcm_sample_bit_depth_chroma_minus1 + 1);
        } else {
                hantro_reg_write(vpu, &g2_max_pcm_size, 0);
                hantro_reg_write(vpu, &g2_min_pcm_size, 0);
                hantro_reg_write(vpu, &g2_bit_depth_pcm_y, 0);
                hantro_reg_write(vpu, &g2_bit_depth_pcm_c, 0);
        }

        hantro_reg_write(vpu, &g2_start_code_e, 1);
        hantro_reg_write(vpu, &g2_init_qp, pps->init_qp_minus26 + 26);
        hantro_reg_write(vpu, &g2_weight_pred_e,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_WEIGHTED_PRED));
        hantro_reg_write(vpu, &g2_cabac_init_present,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_CABAC_INIT_PRESENT));
        hantro_reg_write(vpu, &g2_const_intra_e,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_CONSTRAINED_INTRA_PRED));
        hantro_reg_write(vpu, &g2_transform_skip,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_TRANSFORM_SKIP_ENABLED));
        hantro_reg_write(vpu, &g2_out_filtering_dis,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER));
        hantro_reg_write(vpu, &g2_filt_ctrl_pres,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT));
        hantro_reg_write(vpu, &g2_dependent_slice,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_DEPENDENT_SLICE_SEGMENT_ENABLED));
        hantro_reg_write(vpu, &g2_filter_override,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_OVERRIDE_ENABLED));
        hantro_reg_write(vpu, &g2_refidx0_active,
                         pps->num_ref_idx_l0_default_active_minus1 + 1);
        hantro_reg_write(vpu, &g2_refidx1_active,
                         pps->num_ref_idx_l1_default_active_minus1 + 1);
        hantro_reg_write(vpu, &g2_apf_threshold, 8);
}

static u32 get_dpb_index(const struct v4l2_ctrl_hevc_decode_params *decode_params,
                         const u32 index)
{
        if (index > decode_params->num_active_dpb_entries)
                return 0;

        return index;
}

static void set_ref_pic_list(struct hantro_ctx *ctx)
{
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        struct hantro_dev *vpu = ctx->dev;
        const struct v4l2_ctrl_hevc_decode_params *decode_params = ctrls->decode_params;
        u32 list0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX] = {};
        u32 list1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX] = {};
        static const struct hantro_reg ref_pic_regs0[] = {
                hevc_rlist_f0,
                hevc_rlist_f1,
                hevc_rlist_f2,
                hevc_rlist_f3,
                hevc_rlist_f4,
                hevc_rlist_f5,
                hevc_rlist_f6,
                hevc_rlist_f7,
                hevc_rlist_f8,
                hevc_rlist_f9,
                hevc_rlist_f10,
                hevc_rlist_f11,
                hevc_rlist_f12,
                hevc_rlist_f13,
                hevc_rlist_f14,
                hevc_rlist_f15,
        };
        static const struct hantro_reg ref_pic_regs1[] = {
                hevc_rlist_b0,
                hevc_rlist_b1,
                hevc_rlist_b2,
                hevc_rlist_b3,
                hevc_rlist_b4,
                hevc_rlist_b5,
                hevc_rlist_b6,
                hevc_rlist_b7,
                hevc_rlist_b8,
                hevc_rlist_b9,
                hevc_rlist_b10,
                hevc_rlist_b11,
                hevc_rlist_b12,
                hevc_rlist_b13,
                hevc_rlist_b14,
                hevc_rlist_b15,
        };
        unsigned int i, j;

        /* List 0 contains: short term before, short term after and long term */
        j = 0;
        for (i = 0; i < decode_params->num_poc_st_curr_before && j < ARRAY_SIZE(list0); i++)
                list0[j++] = decode_params->poc_st_curr_before[i];
        for (i = 0; i < decode_params->num_poc_st_curr_after && j < ARRAY_SIZE(list0); i++)
                list0[j++] = decode_params->poc_st_curr_after[i];
        for (i = 0; i < decode_params->num_poc_lt_curr && j < ARRAY_SIZE(list0); i++)
                list0[j++] = decode_params->poc_lt_curr[i];

        /* Fill the list, copying over and over */
        i = 0;
        while (j < ARRAY_SIZE(list0))
                list0[j++] = list0[i++];

        j = 0;
        for (i = 0; i < decode_params->num_poc_st_curr_after && j < ARRAY_SIZE(list1); i++)
                list1[j++] = decode_params->poc_st_curr_after[i];
        for (i = 0; i < decode_params->num_poc_st_curr_before && j < ARRAY_SIZE(list1); i++)
                list1[j++] = decode_params->poc_st_curr_before[i];
        for (i = 0; i < decode_params->num_poc_lt_curr && j < ARRAY_SIZE(list1); i++)
                list1[j++] = decode_params->poc_lt_curr[i];

        i = 0;
        while (j < ARRAY_SIZE(list1))
                list1[j++] = list1[i++];

        for (i = 0; i < V4L2_HEVC_DPB_ENTRIES_NUM_MAX; i++) {
                hantro_reg_write(vpu, &ref_pic_regs0[i],
                                 get_dpb_index(decode_params, list0[i]));
                hantro_reg_write(vpu, &ref_pic_regs1[i],
                                 get_dpb_index(decode_params, list1[i]));
        }
}

static int set_ref(struct hantro_ctx *ctx)
{
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        const struct v4l2_ctrl_hevc_pps *pps = ctrls->pps;
        const struct v4l2_ctrl_hevc_decode_params *decode_params = ctrls->decode_params;
        const struct v4l2_hevc_dpb_entry *dpb = decode_params->dpb;
        dma_addr_t luma_addr, chroma_addr, mv_addr = 0;
        dma_addr_t compress_luma_addr, compress_chroma_addr = 0;
        struct hantro_dev *vpu = ctx->dev;
        struct vb2_v4l2_buffer *vb2_dst;
        struct hantro_decoded_buffer *dst;
        size_t cr_offset = hantro_g2_chroma_offset(ctx);
        size_t mv_offset = hantro_g2_motion_vectors_offset(ctx);
        size_t compress_luma_offset = hantro_g2_luma_compress_offset(ctx);
        size_t compress_chroma_offset = hantro_g2_chroma_compress_offset(ctx);
        u32 max_ref_frames;
        u16 dpb_longterm_e;
        static const struct hantro_reg cur_poc[] = {
                hevc_cur_poc_00,
                hevc_cur_poc_01,
                hevc_cur_poc_02,
                hevc_cur_poc_03,
                hevc_cur_poc_04,
                hevc_cur_poc_05,
                hevc_cur_poc_06,
                hevc_cur_poc_07,
                hevc_cur_poc_08,
                hevc_cur_poc_09,
                hevc_cur_poc_10,
                hevc_cur_poc_11,
                hevc_cur_poc_12,
                hevc_cur_poc_13,
                hevc_cur_poc_14,
                hevc_cur_poc_15,
        };
        unsigned int i;

        max_ref_frames = decode_params->num_poc_lt_curr +
                decode_params->num_poc_st_curr_before +
                decode_params->num_poc_st_curr_after;
        /*
         * Set max_ref_frames to non-zero to avoid HW hang when decoding
         * badly marked I-frames.
         */
        max_ref_frames = max_ref_frames ? max_ref_frames : 1;
        hantro_reg_write(vpu, &g2_num_ref_frames, max_ref_frames);
        hantro_reg_write(vpu, &g2_filter_over_slices,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_PPS_LOOP_FILTER_ACROSS_SLICES_ENABLED));
        hantro_reg_write(vpu, &g2_filter_over_tiles,
                         !!(pps->flags & V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED));

        /*
         * Write POC count diff from current pic.
         */
        for (i = 0; i < decode_params->num_active_dpb_entries && i < ARRAY_SIZE(cur_poc); i++) {
                char poc_diff = decode_params->pic_order_cnt_val - dpb[i].pic_order_cnt_val;

                hantro_reg_write(vpu, &cur_poc[i], poc_diff);
        }

        if (i < ARRAY_SIZE(cur_poc)) {
                /*
                 * After the references, fill one entry pointing to itself,
                 * i.e. difference is zero.
                 */
                hantro_reg_write(vpu, &cur_poc[i], 0);
                i++;
        }

        /* Fill the rest with the current picture */
        for (; i < ARRAY_SIZE(cur_poc); i++)
                hantro_reg_write(vpu, &cur_poc[i], decode_params->pic_order_cnt_val);

        set_ref_pic_list(ctx);

        /* We will only keep the reference pictures that are still used */
        hantro_hevc_ref_init(ctx);

        /* Set up addresses of DPB buffers */
        dpb_longterm_e = 0;
        for (i = 0; i < decode_params->num_active_dpb_entries &&
             i < (V4L2_HEVC_DPB_ENTRIES_NUM_MAX - 1); i++) {
                luma_addr = hantro_hevc_get_ref_buf(ctx, dpb[i].pic_order_cnt_val);
                if (!luma_addr)
                        return -ENOMEM;

                chroma_addr = luma_addr + cr_offset;
                mv_addr = luma_addr + mv_offset;
                compress_luma_addr = luma_addr + compress_luma_offset;
                compress_chroma_addr = luma_addr + compress_chroma_offset;

                if (dpb[i].flags & V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE)
                        dpb_longterm_e |= BIT(V4L2_HEVC_DPB_ENTRIES_NUM_MAX - 1 - i);

                hantro_write_addr(vpu, G2_REF_LUMA_ADDR(i), luma_addr);
                hantro_write_addr(vpu, G2_REF_CHROMA_ADDR(i), chroma_addr);
                hantro_write_addr(vpu, G2_REF_MV_ADDR(i), mv_addr);
                hantro_write_addr(vpu, G2_REF_COMP_LUMA_ADDR(i), compress_luma_addr);
                hantro_write_addr(vpu, G2_REF_COMP_CHROMA_ADDR(i), compress_chroma_addr);
        }

        vb2_dst = hantro_get_dst_buf(ctx);
        dst = vb2_to_hantro_decoded_buf(&vb2_dst->vb2_buf);
        luma_addr = hantro_get_dec_buf_addr(ctx, &dst->base.vb.vb2_buf);
        if (!luma_addr)
                return -ENOMEM;

        if (hantro_hevc_add_ref_buf(ctx, decode_params->pic_order_cnt_val, luma_addr))
                return -EINVAL;

        chroma_addr = luma_addr + cr_offset;
        mv_addr = luma_addr + mv_offset;
        compress_luma_addr = luma_addr + compress_luma_offset;
        compress_chroma_addr = luma_addr + compress_chroma_offset;

        hantro_write_addr(vpu, G2_REF_LUMA_ADDR(i), luma_addr);
        hantro_write_addr(vpu, G2_REF_CHROMA_ADDR(i), chroma_addr);
        hantro_write_addr(vpu, G2_REF_MV_ADDR(i), mv_addr);
        hantro_write_addr(vpu, G2_REF_COMP_LUMA_ADDR(i), compress_luma_addr);
        hantro_write_addr(vpu, G2_REF_COMP_CHROMA_ADDR(i++), compress_chroma_addr);

        hantro_write_addr(vpu, G2_OUT_LUMA_ADDR, luma_addr);
        hantro_write_addr(vpu, G2_OUT_CHROMA_ADDR, chroma_addr);
        hantro_write_addr(vpu, G2_OUT_MV_ADDR, mv_addr);
        hantro_write_addr(vpu, G2_OUT_COMP_LUMA_ADDR, compress_luma_addr);
        hantro_write_addr(vpu, G2_OUT_COMP_CHROMA_ADDR, compress_chroma_addr);

        for (; i < V4L2_HEVC_DPB_ENTRIES_NUM_MAX; i++) {
                hantro_write_addr(vpu, G2_REF_LUMA_ADDR(i), 0);
                hantro_write_addr(vpu, G2_REF_CHROMA_ADDR(i), 0);
                hantro_write_addr(vpu, G2_REF_MV_ADDR(i), 0);
                hantro_write_addr(vpu, G2_REF_COMP_LUMA_ADDR(i), 0);
                hantro_write_addr(vpu, G2_REF_COMP_CHROMA_ADDR(i), 0);
        }

        hantro_reg_write(vpu, &g2_refer_lterm_e, dpb_longterm_e);

        return 0;
}

static void set_buffers(struct hantro_ctx *ctx)
{
        struct vb2_v4l2_buffer *src_buf;
        struct hantro_dev *vpu = ctx->dev;
        dma_addr_t src_dma;
        u32 src_len, src_buf_len;

        src_buf = hantro_get_src_buf(ctx);

        /* Source (stream) buffer. */
        src_dma = vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, 0);
        src_len = vb2_get_plane_payload(&src_buf->vb2_buf, 0);
        src_buf_len = vb2_plane_size(&src_buf->vb2_buf, 0);

        hantro_write_addr(vpu, G2_STREAM_ADDR, src_dma);
        hantro_reg_write(vpu, &g2_stream_len, src_len);
        hantro_reg_write(vpu, &g2_strm_buffer_len, src_buf_len);
        hantro_reg_write(vpu, &g2_strm_start_offset, 0);
        hantro_reg_write(vpu, &g2_start_bit, 0);
        hantro_reg_write(vpu, &g2_write_mvs_e, 1);

        hantro_write_addr(vpu, G2_TILE_SIZES_ADDR, ctx->hevc_dec.tile_sizes.dma);
        hantro_write_addr(vpu, G2_TILE_FILTER_ADDR, ctx->hevc_dec.tile_filter.dma);
        hantro_write_addr(vpu, G2_TILE_SAO_ADDR, ctx->hevc_dec.tile_sao.dma);
        hantro_write_addr(vpu, G2_TILE_BSD_ADDR, ctx->hevc_dec.tile_bsd.dma);
}

static void prepare_scaling_list_buffer(struct hantro_ctx *ctx)
{
        struct hantro_dev *vpu = ctx->dev;
        const struct hantro_hevc_dec_ctrls *ctrls = &ctx->hevc_dec.ctrls;
        const struct v4l2_ctrl_hevc_scaling_matrix *sc = ctrls->scaling;
        const struct v4l2_ctrl_hevc_sps *sps = ctrls->sps;
        u8 *p = ((u8 *)ctx->hevc_dec.scaling_lists.cpu);
        unsigned int scaling_list_enabled;
        unsigned int i, j, k;

        scaling_list_enabled = !!(sps->flags & V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED);
        hantro_reg_write(vpu, &g2_scaling_list_e, scaling_list_enabled);

        if (!scaling_list_enabled)
                return;

        for (i = 0; i < ARRAY_SIZE(sc->scaling_list_dc_coef_16x16); i++)
                *p++ = sc->scaling_list_dc_coef_16x16[i];

        for (i = 0; i < ARRAY_SIZE(sc->scaling_list_dc_coef_32x32); i++)
                *p++ = sc->scaling_list_dc_coef_32x32[i];

        /* 128-bit boundary */
        p += 8;

        /* write scaling lists column by column */

        for (i = 0; i < 6; i++)
                for (j = 0; j < 4; j++)
                        for (k = 0; k < 4; k++)
                                *p++ = sc->scaling_list_4x4[i][4 * k + j];

        for (i = 0; i < 6; i++)
                for (j = 0; j < 8; j++)
                        for (k = 0; k < 8; k++)
                                *p++ = sc->scaling_list_8x8[i][8 * k + j];

        for (i = 0; i < 6; i++)
                for (j = 0; j < 8; j++)
                        for (k = 0; k < 8; k++)
                                *p++ = sc->scaling_list_16x16[i][8 * k + j];

        for (i = 0; i < 2; i++)
                for (j = 0; j < 8; j++)
                        for (k = 0; k < 8; k++)
                                *p++ = sc->scaling_list_32x32[i][8 * k + j];

        hantro_write_addr(vpu, G2_HEVC_SCALING_LIST_ADDR, ctx->hevc_dec.scaling_lists.dma);
}

int hantro_g2_hevc_dec_run(struct hantro_ctx *ctx)
{
        struct hantro_dev *vpu = ctx->dev;
        int ret;

        /* Prepare HEVC decoder context. */
        ret = hantro_hevc_dec_prepare_run(ctx);
        if (ret)
                return ret;

        /* Configure hardware registers. */
        set_params(ctx);

        /* set reference pictures */
        ret = set_ref(ctx);
        if (ret)
                return ret;

        set_buffers(ctx);
        prepare_tile_info_buffer(ctx);

        prepare_scaling_list_buffer(ctx);

        hantro_end_prepare_run(ctx);

        hantro_reg_write(vpu, &g2_mode, HEVC_DEC_MODE);
        hantro_reg_write(vpu, &g2_clk_gate_e, 1);

        /* Don't disable output */
        hantro_reg_write(vpu, &g2_out_dis, 0);

        hantro_reg_write(vpu, &g2_ref_compress_bypass, !ctx->hevc_dec.use_compression);

        /* Bus width and max burst */
        hantro_reg_write(vpu, &g2_buswidth, BUS_WIDTH_128);
        hantro_reg_write(vpu, &g2_max_burst, 16);

        /* Swap */
        hantro_reg_write(vpu, &g2_strm_swap, 0xf);
        hantro_reg_write(vpu, &g2_dirmv_swap, 0xf);
        hantro_reg_write(vpu, &g2_compress_swap, 0xf);

        /* Start decoding! */
        vdpu_write(vpu, G2_REG_INTERRUPT_DEC_E, G2_REG_INTERRUPT);

        return 0;
}