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

   1 #if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
   2 /*
   3  * Copyright 2012-17 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors: AMD
  24  *
  25  */
  26 #include "os_types.h"
  27 #include <drm/drm_dsc.h>
  28 #include "dscc_types.h"
  29 #include "rc_calc.h"
  30
  31 double dsc_ceil(double num);
  32
  33 static void copy_pps_fields(struct drm_dsc_config *to, const struct drm_dsc_config *from)
  34 {
  35         to->line_buf_depth           = from->line_buf_depth;
  36         to->bits_per_component       = from->bits_per_component;
  37         to->convert_rgb              = from->convert_rgb;
  38         to->slice_width              = from->slice_width;
  39         to->slice_height             = from->slice_height;
  40         to->simple_422               = from->simple_422;
  41         to->native_422               = from->native_422;
  42         to->native_420               = from->native_420;
  43         to->pic_width                = from->pic_width;
  44         to->pic_height               = from->pic_height;
  45         to->rc_tgt_offset_high       = from->rc_tgt_offset_high;
  46         to->rc_tgt_offset_low        = from->rc_tgt_offset_low;
  47         to->bits_per_pixel           = from->bits_per_pixel;
  48         to->rc_edge_factor           = from->rc_edge_factor;
  49         to->rc_quant_incr_limit1     = from->rc_quant_incr_limit1;
  50         to->rc_quant_incr_limit0     = from->rc_quant_incr_limit0;
  51         to->initial_xmit_delay       = from->initial_xmit_delay;
  52         to->initial_dec_delay        = from->initial_dec_delay;
  53         to->block_pred_enable        = from->block_pred_enable;
  54         to->first_line_bpg_offset    = from->first_line_bpg_offset;
  55         to->second_line_bpg_offset   = from->second_line_bpg_offset;
  56         to->initial_offset           = from->initial_offset;
  57         memcpy(&to->rc_buf_thresh, &from->rc_buf_thresh, sizeof(from->rc_buf_thresh));
  58         memcpy(&to->rc_range_params, &from->rc_range_params, sizeof(from->rc_range_params));
  59         to->rc_model_size            = from->rc_model_size;
  60         to->flatness_min_qp          = from->flatness_min_qp;
  61         to->flatness_max_qp          = from->flatness_max_qp;
  62         to->initial_scale_value      = from->initial_scale_value;
  63         to->scale_decrement_interval = from->scale_decrement_interval;
  64         to->scale_increment_interval = from->scale_increment_interval;
  65         to->nfl_bpg_offset           = from->nfl_bpg_offset;
  66         to->nsl_bpg_offset           = from->nsl_bpg_offset;
  67         to->slice_bpg_offset         = from->slice_bpg_offset;
  68         to->final_offset             = from->final_offset;
  69         to->vbr_enable               = from->vbr_enable;
  70         to->slice_chunk_size         = from->slice_chunk_size;
  71         to->second_line_offset_adj   = from->second_line_offset_adj;
  72         to->dsc_version_minor        = from->dsc_version_minor;
  73 }
  74
  75 static void copy_rc_to_cfg(struct drm_dsc_config *dsc_cfg, const struct rc_params *rc)
  76 {
  77         int i;
  78
  79         dsc_cfg->rc_quant_incr_limit0   = rc->rc_quant_incr_limit0;
  80         dsc_cfg->rc_quant_incr_limit1   = rc->rc_quant_incr_limit1;
  81         dsc_cfg->initial_offset         = rc->initial_fullness_offset;
  82         dsc_cfg->initial_xmit_delay     = rc->initial_xmit_delay;
  83         dsc_cfg->first_line_bpg_offset  = rc->first_line_bpg_offset;
  84         dsc_cfg->second_line_bpg_offset = rc->second_line_bpg_offset;
  85         dsc_cfg->flatness_min_qp        = rc->flatness_min_qp;
  86         dsc_cfg->flatness_max_qp        = rc->flatness_max_qp;
  87         for (i = 0; i < QP_SET_SIZE; ++i) {
  88                 dsc_cfg->rc_range_params[i].range_min_qp     = rc->qp_min[i];
  89                 dsc_cfg->rc_range_params[i].range_max_qp     = rc->qp_max[i];
  90                 /* Truncate 8-bit signed value to 6-bit signed value */
  91                 dsc_cfg->rc_range_params[i].range_bpg_offset = 0x3f & rc->ofs[i];
  92         }
  93         dsc_cfg->rc_model_size    = rc->rc_model_size;
  94         dsc_cfg->rc_edge_factor   = rc->rc_edge_factor;
  95         dsc_cfg->rc_tgt_offset_high = rc->rc_tgt_offset_hi;
  96         dsc_cfg->rc_tgt_offset_low = rc->rc_tgt_offset_lo;
  97
  98         for (i = 0; i < QP_SET_SIZE - 1; ++i)
  99                 dsc_cfg->rc_buf_thresh[i] = rc->rc_buf_thresh[i];
 100 }
 101
 102 int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params)
 103 {
 104         enum colour_mode  mode = pps->convert_rgb ? CM_RGB :
 105                                                         (pps->simple_422  ? CM_444 :
 106                                                         (pps->native_422  ? CM_422 :
 107                                                         pps->native_420  ? CM_420 : CM_444));
 108         enum bits_per_comp bpc = (pps->bits_per_component == 8) ? BPC_8 :
 109                                                         (pps->bits_per_component == 10) ? BPC_10 : BPC_12;
 110         float            bpp = ((float) pps->bits_per_pixel / 16.0);
 111         int              slice_width  = pps->slice_width;
 112         int              slice_height = pps->slice_height;
 113         int              ret;
 114         struct rc_params rc;
 115         struct drm_dsc_config   dsc_cfg;
 116
 117         double d_bytes_per_pixel = dsc_ceil(bpp * slice_width / 8.0) / slice_width;
 118
 119         // TODO: Make sure the formula for calculating this is precise (ceiling vs. floor, and at what point they should be applied)
 120         if (pps->native_422 || pps->native_420)
 121                 d_bytes_per_pixel /= 2;
 122
 123         dsc_params->bytes_per_pixel = (uint32_t)dsc_ceil(d_bytes_per_pixel * 0x10000000);
 124
 125         /* in native_422 or native_420 modes, the bits_per_pixel is double the target bpp
 126          * (the latter is what calc_rc_params expects)
 127          */
 128         if (pps->native_422 || pps->native_420)
 129                 bpp /= 2.0;
 130
 131         calc_rc_params(&rc, mode, bpc, bpp, slice_width, slice_height, pps->dsc_version_minor);
 132         dsc_params->pps = *pps;
 133         dsc_params->pps.initial_scale_value = 8 * rc.rc_model_size / (rc.rc_model_size - rc.initial_fullness_offset);
 134
 135         copy_pps_fields(&dsc_cfg, &dsc_params->pps);
 136         copy_rc_to_cfg(&dsc_cfg, &rc);
 137
 138         dsc_cfg.mux_word_size = dsc_params->pps.bits_per_component <= 10 ? 48 : 64;
 139
 140         ret = drm_dsc_compute_rc_parameters(&dsc_cfg);
 141
 142         copy_pps_fields(&dsc_params->pps, &dsc_cfg);
 143         dsc_params->rc_buffer_model_size = dsc_cfg.rc_bits;
 144         return ret;
 145 }
 146
 147 #endif