drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c

   1 /*
   2  * Copyright 2012-17 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25 #include <drm/drm_dsc.h>
  26 #include "dscc_types.h"
  27 #include "rc_calc.h"
  28
  29 static void copy_pps_fields(struct drm_dsc_config *to, const struct drm_dsc_config *from)
  30 {
  31         to->line_buf_depth           = from->line_buf_depth;
  32         to->bits_per_component       = from->bits_per_component;
  33         to->convert_rgb              = from->convert_rgb;
  34         to->slice_width              = from->slice_width;
  35         to->slice_height             = from->slice_height;
  36         to->simple_422               = from->simple_422;
  37         to->native_422               = from->native_422;
  38         to->native_420               = from->native_420;
  39         to->pic_width                = from->pic_width;
  40         to->pic_height               = from->pic_height;
  41         to->rc_tgt_offset_high       = from->rc_tgt_offset_high;
  42         to->rc_tgt_offset_low        = from->rc_tgt_offset_low;
  43         to->bits_per_pixel           = from->bits_per_pixel;
  44         to->rc_edge_factor           = from->rc_edge_factor;
  45         to->rc_quant_incr_limit1     = from->rc_quant_incr_limit1;
  46         to->rc_quant_incr_limit0     = from->rc_quant_incr_limit0;
  47         to->initial_xmit_delay       = from->initial_xmit_delay;
  48         to->initial_dec_delay        = from->initial_dec_delay;
  49         to->block_pred_enable        = from->block_pred_enable;
  50         to->first_line_bpg_offset    = from->first_line_bpg_offset;
  51         to->second_line_bpg_offset   = from->second_line_bpg_offset;
  52         to->initial_offset           = from->initial_offset;
  53         memcpy(&to->rc_buf_thresh, &from->rc_buf_thresh, sizeof(from->rc_buf_thresh));
  54         memcpy(&to->rc_range_params, &from->rc_range_params, sizeof(from->rc_range_params));
  55         to->rc_model_size            = from->rc_model_size;
  56         to->flatness_min_qp          = from->flatness_min_qp;
  57         to->flatness_max_qp          = from->flatness_max_qp;
  58         to->initial_scale_value      = from->initial_scale_value;
  59         to->scale_decrement_interval = from->scale_decrement_interval;
  60         to->scale_increment_interval = from->scale_increment_interval;
  61         to->nfl_bpg_offset           = from->nfl_bpg_offset;
  62         to->nsl_bpg_offset           = from->nsl_bpg_offset;
  63         to->slice_bpg_offset         = from->slice_bpg_offset;
  64         to->final_offset             = from->final_offset;
  65         to->vbr_enable               = from->vbr_enable;
  66         to->slice_chunk_size         = from->slice_chunk_size;
  67         to->second_line_offset_adj   = from->second_line_offset_adj;
  68         to->dsc_version_minor        = from->dsc_version_minor;
  69 }
  70
  71 static void copy_rc_to_cfg(struct drm_dsc_config *dsc_cfg, const struct rc_params *rc)
  72 {
  73         int i;
  74
  75         dsc_cfg->rc_quant_incr_limit0   = rc->rc_quant_incr_limit0;
  76         dsc_cfg->rc_quant_incr_limit1   = rc->rc_quant_incr_limit1;
  77         dsc_cfg->initial_offset         = rc->initial_fullness_offset;
  78         dsc_cfg->initial_xmit_delay     = rc->initial_xmit_delay;
  79         dsc_cfg->first_line_bpg_offset  = rc->first_line_bpg_offset;
  80         dsc_cfg->second_line_bpg_offset = rc->second_line_bpg_offset;
  81         dsc_cfg->flatness_min_qp        = rc->flatness_min_qp;
  82         dsc_cfg->flatness_max_qp        = rc->flatness_max_qp;
  83         for (i = 0; i < QP_SET_SIZE; ++i) {
  84                 dsc_cfg->rc_range_params[i].range_min_qp     = rc->qp_min[i];
  85                 dsc_cfg->rc_range_params[i].range_max_qp     = rc->qp_max[i];
  86                 /* Truncate 8-bit signed value to 6-bit signed value */
  87                 dsc_cfg->rc_range_params[i].range_bpg_offset = 0x3f & rc->ofs[i];
  88         }
  89         dsc_cfg->rc_model_size    = rc->rc_model_size;
  90         dsc_cfg->rc_edge_factor   = rc->rc_edge_factor;
  91         dsc_cfg->rc_tgt_offset_high = rc->rc_tgt_offset_hi;
  92         dsc_cfg->rc_tgt_offset_low = rc->rc_tgt_offset_lo;
  93
  94         for (i = 0; i < QP_SET_SIZE - 1; ++i)
  95                 dsc_cfg->rc_buf_thresh[i] = rc->rc_buf_thresh[i];
  96 }
  97
  98 int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params)
  99 {
 100         int              ret;
 101         struct rc_params rc;
 102         struct drm_dsc_config   dsc_cfg;
 103         unsigned long long tmp;
 104
 105         calc_rc_params(&rc, pps);
 106         dsc_params->pps = *pps;
 107         dsc_params->pps.initial_scale_value = 8 * rc.rc_model_size / (rc.rc_model_size - rc.initial_fullness_offset);
 108
 109         copy_pps_fields(&dsc_cfg, &dsc_params->pps);
 110         copy_rc_to_cfg(&dsc_cfg, &rc);
 111
 112         dsc_cfg.mux_word_size = dsc_params->pps.bits_per_component <= 10 ? 48 : 64;
 113
 114         ret = drm_dsc_compute_rc_parameters(&dsc_cfg);
 115         tmp = (unsigned long long)dsc_cfg.slice_chunk_size * 0x10000000 + (dsc_cfg.slice_width - 1);
 116         do_div(tmp, (uint32_t)dsc_cfg.slice_width);  //ROUND-UP
 117         dsc_params->bytes_per_pixel = (uint32_t)tmp;
 118
 119         copy_pps_fields(&dsc_params->pps, &dsc_cfg);
 120         dsc_params->rc_buffer_model_size = dsc_cfg.rc_bits;
 121         return ret;
 122 }
 123