diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c new file mode 100644 index 000000000000..ef5f84a144c3 --- /dev/null +++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c @@ -0,0 +1,858 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Author: AMD + */ + +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT +#include "dc.h" +#include "core_types.h" +#include "dsc.h" +#include <drm/drm_dp_helper.h> + +/* This module's internal functions */ + +static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size) +{ + + switch (dpcd_buff_block_size) { + case DP_DSC_RC_BUF_BLK_SIZE_1: + *buff_block_size = 1024; + break; + case DP_DSC_RC_BUF_BLK_SIZE_4: + *buff_block_size = 4 * 1024; + break; + case DP_DSC_RC_BUF_BLK_SIZE_16: + *buff_block_size = 16 * 1024; + break; + case DP_DSC_RC_BUF_BLK_SIZE_64: + *buff_block_size = 64 * 1024; + break; + default: { + dm_error("%s: DPCD DSC buffer size not recognized.\n", __func__); + return false; + } + } + + return true; +} + + +static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth) +{ + if (0 <= dpcd_line_buff_bit_depth && dpcd_line_buff_bit_depth <= 7) + *line_buff_bit_depth = dpcd_line_buff_bit_depth + 9; + else if (dpcd_line_buff_bit_depth == 8) + *line_buff_bit_depth = 8; + else { + dm_error("%s: DPCD DSC buffer depth not recognized.\n", __func__); + return false; + } + + return true; +} + + +static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput) +{ + switch (dpcd_throughput) { + case DP_DSC_THROUGHPUT_MODE_0_UPSUPPORTED: + *throughput = 0; + break; + case DP_DSC_THROUGHPUT_MODE_0_170: + *throughput = 170; + break; + case DP_DSC_THROUGHPUT_MODE_0_340: + *throughput = 340; + break; + case DP_DSC_THROUGHPUT_MODE_0_400: + *throughput = 400; + break; + case DP_DSC_THROUGHPUT_MODE_0_450: + *throughput = 450; + break; + case DP_DSC_THROUGHPUT_MODE_0_500: + *throughput = 500; + break; + case DP_DSC_THROUGHPUT_MODE_0_550: + *throughput = 550; + break; + case DP_DSC_THROUGHPUT_MODE_0_600: + *throughput = 600; + break; + case DP_DSC_THROUGHPUT_MODE_0_650: + *throughput = 650; + break; + case DP_DSC_THROUGHPUT_MODE_0_700: + *throughput = 700; + break; + case DP_DSC_THROUGHPUT_MODE_0_750: + *throughput = 750; + break; + case DP_DSC_THROUGHPUT_MODE_0_800: + *throughput = 800; + break; + case DP_DSC_THROUGHPUT_MODE_0_850: + *throughput = 850; + break; + case DP_DSC_THROUGHPUT_MODE_0_900: + *throughput = 900; + break; + case DP_DSC_THROUGHPUT_MODE_0_950: + *throughput = 950; + break; + case DP_DSC_THROUGHPUT_MODE_0_1000: + *throughput = 1000; + break; + default: { + dm_error("%s: DPCD DSC throughput mode not recognized.\n", __func__); + return false; + } + } + + return true; +} + + +static bool dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd, uint32_t *bpp_increment_div) +{ + + switch (bpp_increment_dpcd) { + case 0: + *bpp_increment_div = 16; + break; + case 1: + *bpp_increment_div = 8; + break; + case 2: + *bpp_increment_div = 4; + break; + case 3: + *bpp_increment_div = 2; + break; + case 4: + *bpp_increment_div = 1; + break; + default: { + dm_error("%s: DPCD DSC bits-per-pixel increment not recognized.\n", __func__); + return false; + } + } + + return true; +} + +static void get_dsc_enc_caps( + const struct dc *dc, + struct dsc_enc_caps *dsc_enc_caps, + int pixel_clock_100Hz) +{ + // This is a static HW query, so we can use any DSC + struct display_stream_compressor *dsc = dc->res_pool->dscs[0]; + + memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps)); + if (dsc) + dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz); +} + +/* Returns 'false' if no intersection was found for at least one capablity. + * It also implicitly validates some sink caps against invalid value of zero. + */ +static bool intersect_dsc_caps( + const struct dsc_dec_dpcd_caps *dsc_sink_caps, + const struct dsc_enc_caps *dsc_enc_caps, + enum dc_pixel_encoding pixel_encoding, + struct dsc_enc_caps *dsc_common_caps) +{ + int32_t max_slices; + int32_t total_sink_throughput; + + memset(dsc_common_caps, 0, sizeof(struct dsc_enc_caps)); + + dsc_common_caps->dsc_version = min(dsc_sink_caps->dsc_version, dsc_enc_caps->dsc_version); + if (!dsc_common_caps->dsc_version) + return false; + + dsc_common_caps->slice_caps.bits.NUM_SLICES_1 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_1 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_1; + dsc_common_caps->slice_caps.bits.NUM_SLICES_2 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_2 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_2; + dsc_common_caps->slice_caps.bits.NUM_SLICES_4 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_4 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_4; + dsc_common_caps->slice_caps.bits.NUM_SLICES_8 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_8 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_8; + if (!dsc_common_caps->slice_caps.raw) + return false; + + dsc_common_caps->lb_bit_depth = min(dsc_sink_caps->lb_bit_depth, dsc_enc_caps->lb_bit_depth); + if (!dsc_common_caps->lb_bit_depth) + return false; + + dsc_common_caps->is_block_pred_supported = dsc_sink_caps->is_block_pred_supported && dsc_enc_caps->is_block_pred_supported; + + dsc_common_caps->color_formats.raw = dsc_sink_caps->color_formats.raw & dsc_enc_caps->color_formats.raw; + if (!dsc_common_caps->color_formats.raw) + return false; + + dsc_common_caps->color_depth.raw = dsc_sink_caps->color_depth.raw & dsc_enc_caps->color_depth.raw; + if (!dsc_common_caps->color_depth.raw) + return false; + + max_slices = 0; + if (dsc_common_caps->slice_caps.bits.NUM_SLICES_1) + max_slices = 1; + + if (dsc_common_caps->slice_caps.bits.NUM_SLICES_2) + max_slices = 2; + + if (dsc_common_caps->slice_caps.bits.NUM_SLICES_4) + max_slices = 4; + + total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_0_mps; + if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420) + total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_1_mps; + + dsc_common_caps->max_total_throughput_mps = min(total_sink_throughput, dsc_enc_caps->max_total_throughput_mps); + + dsc_common_caps->max_slice_width = min(dsc_sink_caps->max_slice_width, dsc_enc_caps->max_slice_width); + if (!dsc_common_caps->max_slice_width) + return false; + + dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div); + + // TODO DSC: Remove this workaround for N422 and 420 once it's fixed, or move it to get_dsc_encoder_caps() + if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420) + dsc_common_caps->bpp_increment_div = min(dsc_common_caps->bpp_increment_div, (uint32_t)8); + + return true; +} + +struct dc_dsc_policy { + bool use_min_slices_h; + int max_slices_h; // Maximum available if 0 + int num_slices_v; + int max_target_bpp; + int min_target_bpp; // Minimum target bits per pixel +}; + +static inline uint32_t dsc_div_by_10_round_up(uint32_t value) +{ + return (value + 9) / 10; +} + +static inline uint32_t calc_dsc_bpp_x16(uint32_t stream_bandwidth_kbps, uint32_t pix_clk_100hz, uint32_t bpp_increment_div) +{ + uint32_t dsc_target_bpp_x16; + float f_dsc_target_bpp; + float f_stream_bandwidth_100bps = stream_bandwidth_kbps * 10.0f; + uint32_t precision = bpp_increment_div; // bpp_increment_div is actually precision + + f_dsc_target_bpp = f_stream_bandwidth_100bps / pix_clk_100hz; + + // Round down to the nearest precision stop to bring it into DSC spec range + dsc_target_bpp_x16 = (uint32_t)(f_dsc_target_bpp * precision); + dsc_target_bpp_x16 = (dsc_target_bpp_x16 * 16) / precision; + + return dsc_target_bpp_x16; +} + +const struct dc_dsc_policy dsc_policy = { + .use_min_slices_h = true, // DSC Policy: Use minimum number of slices that fits the pixel clock + .max_slices_h = 0, // DSC Policy: Use max available slices (in our case 4 for or 8, depending on the mode) + /* DSC Policy: Number of vertical slices set to 2 for no particular reason. + * Seems small enough to not affect the quality too much, while still providing some error + * propagation control (which may also help debugging). + */ + .num_slices_v = 16, + .max_target_bpp = 16, + .min_target_bpp = 8, +}; + + +/* Get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range, and timing's pixel clock + * and uncompressed bandwidth. + */ +static void get_dsc_bandwidth_range( + const uint32_t min_bpp, + const uint32_t max_bpp, + const struct dsc_enc_caps *dsc_caps, + const struct dc_crtc_timing *timing, + struct dc_dsc_bw_range *range) +{ + /* native stream bandwidth */ + range->stream_kbps = dc_bandwidth_in_kbps_from_timing(timing); + + /* max dsc target bpp */ + range->max_kbps = dsc_div_by_10_round_up(max_bpp * timing->pix_clk_100hz); + range->max_target_bpp_x16 = max_bpp * 16; + if (range->max_kbps > range->stream_kbps) { + /* max dsc target bpp is capped to native bandwidth */ + range->max_kbps = range->stream_kbps; + range->max_target_bpp_x16 = calc_dsc_bpp_x16(range->stream_kbps, timing->pix_clk_100hz, dsc_caps->bpp_increment_div); + } + + /* min dsc target bpp */ + range->min_kbps = dsc_div_by_10_round_up(min_bpp * timing->pix_clk_100hz); + range->min_target_bpp_x16 = min_bpp * 16; + if (range->min_kbps > range->max_kbps) { + /* min dsc target bpp is capped to max dsc bandwidth*/ + range->min_kbps = range->max_kbps; + range->min_target_bpp_x16 = range->max_target_bpp_x16; + } +} + + +/* Decides if DSC should be used and calculates target bpp if it should, applying DSC policy. + * + * Returns: + * - 'true' if DSC was required by policy and was successfully applied + * - 'false' if DSC was not necessary (e.g. if uncompressed stream fits 'target_bandwidth_kbps'), + * or if it couldn't be applied based on DSC policy. + */ +static bool decide_dsc_target_bpp_x16( + const struct dc_dsc_policy *policy, + const struct dsc_enc_caps *dsc_common_caps, + const int target_bandwidth_kbps, + const struct dc_crtc_timing *timing, + int *target_bpp_x16) +{ + bool should_use_dsc = false; + struct dc_dsc_bw_range range; + + memset(&range, 0, sizeof(range)); + + get_dsc_bandwidth_range(policy->min_target_bpp, policy->max_target_bpp, + dsc_common_caps, timing, &range); + if (target_bandwidth_kbps >= range.stream_kbps) { + /* enough bandwidth without dsc */ + *target_bpp_x16 = 0; + should_use_dsc = false; + } else if (target_bandwidth_kbps >= range.max_kbps) { + /* use max target bpp allowed */ + *target_bpp_x16 = range.max_target_bpp_x16; + should_use_dsc = true; + } else if (target_bandwidth_kbps >= range.min_kbps) { + /* use target bpp that can take entire target bandwidth */ + *target_bpp_x16 = calc_dsc_bpp_x16(target_bandwidth_kbps, timing->pix_clk_100hz, dsc_common_caps->bpp_increment_div); + should_use_dsc = true; + } else { + /* not enough bandwidth to fulfill minimum requirement */ + *target_bpp_x16 = 0; + should_use_dsc = false; + } + + return should_use_dsc; +} + +#define MIN_AVAILABLE_SLICES_SIZE 4 + +static int get_available_dsc_slices(union dsc_enc_slice_caps slice_caps, int *available_slices) +{ + int idx = 0; + + memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE); + + if (slice_caps.bits.NUM_SLICES_1) + available_slices[idx++] = 1; + + if (slice_caps.bits.NUM_SLICES_2) + available_slices[idx++] = 2; + + if (slice_caps.bits.NUM_SLICES_4) + available_slices[idx++] = 4; + + if (slice_caps.bits.NUM_SLICES_8) + available_slices[idx++] = 8; + + return idx; +} + + +static int get_max_dsc_slices(union dsc_enc_slice_caps slice_caps) +{ + int max_slices = 0; + int available_slices[MIN_AVAILABLE_SLICES_SIZE]; + int end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); + + if (end_idx > 0) + max_slices = available_slices[end_idx - 1]; + + return max_slices; +} + + +// Increment sice number in available sice numbers stops if possible, or just increment if not +static int inc_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices) +{ + // Get next bigger num slices available in common caps + int available_slices[MIN_AVAILABLE_SLICES_SIZE]; + int end_idx; + int i; + int new_num_slices = num_slices; + + end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); + if (end_idx == 0) { + // No available slices found + new_num_slices++; + return new_num_slices; + } + + // Numbers of slices found - get the next bigger number + for (i = 0; i < end_idx; i++) { + if (new_num_slices < available_slices[i]) { + new_num_slices = available_slices[i]; + break; + } + } + + if (new_num_slices == num_slices) // No biger number of slices found + new_num_slices++; + + return new_num_slices; +} + + +// Decrement sice number in available sice numbers stops if possible, or just decrement if not. Stop at zero. +static int dec_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices) +{ + // Get next bigger num slices available in common caps + int available_slices[MIN_AVAILABLE_SLICES_SIZE]; + int end_idx; + int i; + int new_num_slices = num_slices; + + end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); + if (end_idx == 0 && new_num_slices > 0) { + // No numbers of slices found + new_num_slices++; + return new_num_slices; + } + + // Numbers of slices found - get the next smaller number + for (i = end_idx - 1; i >= 0; i--) { + if (new_num_slices > available_slices[i]) { + new_num_slices = available_slices[i]; + break; + } + } + + if (new_num_slices == num_slices) { + // No smaller number of slices found + new_num_slices--; + if (new_num_slices < 0) + new_num_slices = 0; + } + + return new_num_slices; +} + + +// Choose next bigger number of slices if the requested number of slices is not available +static int fit_num_slices_up(union dsc_enc_slice_caps slice_caps, int num_slices) +{ + // Get next bigger num slices available in common caps + int available_slices[MIN_AVAILABLE_SLICES_SIZE]; + int end_idx; + int i; + int new_num_slices = num_slices; + + end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]); + if (end_idx == 0) { + // No available slices found + new_num_slices++; + return new_num_slices; + } + + // Numbers of slices found - get the equal or next bigger number + for (i = 0; i < end_idx; i++) { + if (new_num_slices <= available_slices[i]) { + new_num_slices = available_slices[i]; + break; + } + } + + return new_num_slices; +} + + +/* Attempts to set DSC configuration for the stream, applying DSC policy. + * Returns 'true' if successful or 'false' if not. + * + * Parameters: + * + * dsc_sink_caps - DSC sink decoder capabilities (from DPCD) + * + * dsc_enc_caps - DSC encoder capabilities + * + * target_bandwidth_kbps - Target bandwidth to fit the stream into. + * If 0, do not calculate target bpp. + * + * timing - The stream timing to fit into 'target_bandwidth_kbps' or apply + * maximum compression to, if 'target_badwidth == 0' + * + * dsc_cfg - DSC configuration to use if it was possible to come up with + * one for the given inputs. + * The target bitrate after DSC can be calculated by multiplying + * dsc_cfg.bits_per_pixel (in U6.4 format) by pixel rate, e.g. + * + * dsc_stream_bitrate_kbps = (int)ceil(timing->pix_clk_khz * dsc_cfg.bits_per_pixel / 16.0); + */ +static bool setup_dsc_config( + const struct dsc_dec_dpcd_caps *dsc_sink_caps, + const struct dsc_enc_caps *dsc_enc_caps, + int target_bandwidth_kbps, + const struct dc_crtc_timing *timing, + struct dc_dsc_config *dsc_cfg) +{ + struct dsc_enc_caps dsc_common_caps; + int max_slices_h; + int min_slices_h; + int num_slices_h; + int pic_width; + int slice_width; + int target_bpp; + int sink_per_slice_throughput_mps; + int branch_max_throughput_mps = 0; + bool is_dsc_possible = false; + int num_slices_v; + int pic_height; + + memset(dsc_cfg, 0, sizeof(struct dc_dsc_config)); + + pic_width = timing->h_addressable + timing->h_border_left + timing->h_border_right; + pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom; + + if (!dsc_sink_caps->is_dsc_supported) + goto done; + + if (dsc_sink_caps->branch_max_line_width && dsc_sink_caps->branch_max_line_width < pic_width) + goto done; + + // Intersect decoder with encoder DSC caps and validate DSC settings + is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, dsc_enc_caps, timing->pixel_encoding, &dsc_common_caps); + if (!is_dsc_possible) + goto done; + + if (target_bandwidth_kbps > 0) { + is_dsc_possible = decide_dsc_target_bpp_x16(&dsc_policy, &dsc_common_caps, target_bandwidth_kbps, timing, &target_bpp); + dsc_cfg->bits_per_pixel = target_bpp; + } + if (!is_dsc_possible) + goto done; + + sink_per_slice_throughput_mps = 0; + + // Validate available DSC settings against the mode timing + + // Validate color format (and pick up the throughput values) + dsc_cfg->ycbcr422_simple = false; + switch (timing->pixel_encoding) { + case PIXEL_ENCODING_RGB: + is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.RGB; + sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; + branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps; + break; + case PIXEL_ENCODING_YCBCR444: + is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_444; + sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; + branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_0_mps; + break; + case PIXEL_ENCODING_YCBCR422: + is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_422; + sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps; + branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps; + if (!is_dsc_possible) { + is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_SIMPLE_422; + dsc_cfg->ycbcr422_simple = is_dsc_possible; + sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_0_mps; + } + break; + case PIXEL_ENCODING_YCBCR420: + is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_420; + sink_per_slice_throughput_mps = dsc_sink_caps->throughput_mode_1_mps; + branch_max_throughput_mps = dsc_sink_caps->branch_overall_throughput_1_mps; + break; + default: + is_dsc_possible = false; + } + + // Validate branch's maximum throughput + if (branch_max_throughput_mps && dsc_div_by_10_round_up(timing->pix_clk_100hz) > branch_max_throughput_mps * 1000) + is_dsc_possible = false; + + if (!is_dsc_possible) + goto done; + + // Color depth + switch (timing->display_color_depth) { + case COLOR_DEPTH_888: + is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_8_BPC; + break; + case COLOR_DEPTH_101010: + is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_10_BPC; + break; + case COLOR_DEPTH_121212: + is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_12_BPC; + break; + default: + is_dsc_possible = false; + } + + if (!is_dsc_possible) + goto done; + + // DSC slicing + max_slices_h = get_max_dsc_slices(dsc_common_caps.slice_caps); + + while (max_slices_h > 0) { + if (pic_width % max_slices_h == 0) + break; + + max_slices_h = dec_num_slices(dsc_common_caps.slice_caps, max_slices_h); + } + + is_dsc_possible = (dsc_common_caps.max_slice_width > 0); + if (!is_dsc_possible) + goto done; + + min_slices_h = pic_width / dsc_common_caps.max_slice_width; + if (pic_width % dsc_common_caps.max_slice_width) + min_slices_h++; + + min_slices_h = fit_num_slices_up(dsc_common_caps.slice_caps, min_slices_h); + + while (min_slices_h <= max_slices_h) { + int pix_clk_per_slice_khz = dsc_div_by_10_round_up(timing->pix_clk_100hz) / min_slices_h; + if (pix_clk_per_slice_khz <= sink_per_slice_throughput_mps * 1000) + break; + + min_slices_h = inc_num_slices(dsc_common_caps.slice_caps, min_slices_h); + } + + if (pic_width % min_slices_h != 0) + min_slices_h = 0; // DSC TODO: Maybe try increasing the number of slices first? + + is_dsc_possible = (min_slices_h <= max_slices_h); + if (!is_dsc_possible) + goto done; + + if (dsc_policy.use_min_slices_h) { + if (min_slices_h > 0) + num_slices_h = min_slices_h; + else if (max_slices_h > 0) { // Fall back to max slices if min slices is not working out + if (dsc_policy.max_slices_h) + num_slices_h = min(dsc_policy.max_slices_h, max_slices_h); + else + num_slices_h = max_slices_h; + } else + is_dsc_possible = false; + } else { + if (max_slices_h > 0) { + if (dsc_policy.max_slices_h) + num_slices_h = min(dsc_policy.max_slices_h, max_slices_h); + else + num_slices_h = max_slices_h; + } else if (min_slices_h > 0) // Fall back to min slices if max slices is not possible + num_slices_h = min_slices_h; + else + is_dsc_possible = false; + } + + if (!is_dsc_possible) + goto done; + + dsc_cfg->num_slices_h = num_slices_h; + slice_width = pic_width / num_slices_h; + + // Vertical number of slices: start from policy and pick the first one that height is divisible by. + // For 4:2:0 make sure the slice height is divisible by 2 as well. + num_slices_v = dsc_policy.num_slices_v; + if (num_slices_v < 1) + num_slices_v = 1; + + while (num_slices_v >= 1) { + if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) { + int slice_height = pic_height / num_slices_v; + if (pic_height % num_slices_v == 0 && slice_height % 2 == 0) + break; + } else if (pic_height % num_slices_v == 0) + break; + + num_slices_v--; + } + + dsc_cfg->num_slices_v = num_slices_v; + + is_dsc_possible = slice_width <= dsc_common_caps.max_slice_width; + if (!is_dsc_possible) + goto done; + + // Final decission: can we do DSC or not? + if (is_dsc_possible) { + // Fill out the rest of DSC settings + dsc_cfg->block_pred_enable = dsc_common_caps.is_block_pred_supported; + dsc_cfg->linebuf_depth = dsc_common_caps.lb_bit_depth; + dsc_cfg->version_minor = (dsc_common_caps.dsc_version & 0xf0) >> 4; + } + +done: + if (!is_dsc_possible) + memset(dsc_cfg, 0, sizeof(struct dc_dsc_config)); + + return is_dsc_possible; +} + +bool dc_dsc_parse_dsc_dpcd(const uint8_t *dpcd_dsc_basic_data, const uint8_t *dpcd_dsc_ext_data, struct dsc_dec_dpcd_caps *dsc_sink_caps) +{ + if (!dpcd_dsc_basic_data) + return false; + + dsc_sink_caps->is_dsc_supported = (dpcd_dsc_basic_data[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) != 0; + if (!dsc_sink_caps->is_dsc_supported) + return false; + + dsc_sink_caps->dsc_version = dpcd_dsc_basic_data[DP_DSC_REV - DP_DSC_SUPPORT]; + + { + int buff_block_size; + int buff_size; + + if (!dsc_buff_block_size_from_dpcd(dpcd_dsc_basic_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT], &buff_block_size)) + return false; + + buff_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT] + 1; + dsc_sink_caps->rc_buffer_size = buff_size * buff_block_size; + } + + dsc_sink_caps->slice_caps1.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT]; + if (!dsc_line_buff_depth_from_dpcd(dpcd_dsc_basic_data[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT], &dsc_sink_caps->lb_bit_depth)) + return false; + + dsc_sink_caps->is_block_pred_supported = + (dpcd_dsc_basic_data[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_BLK_PREDICTION_IS_SUPPORTED) != 0; + + dsc_sink_caps->edp_max_bits_per_pixel = + dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | + dpcd_dsc_basic_data[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] << 8; + + dsc_sink_caps->color_formats.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT]; + dsc_sink_caps->color_depth.raw = dpcd_dsc_basic_data[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT]; + + { + int dpcd_throughput = dpcd_dsc_basic_data[DP_DSC_PEAK_THROUGHPUT - DP_DSC_SUPPORT]; + + if (!dsc_throughput_from_dpcd(dpcd_throughput & DP_DSC_THROUGHPUT_MODE_0_MASK, &dsc_sink_caps->throughput_mode_0_mps)) + return false; + + dpcd_throughput = (dpcd_throughput & DP_DSC_THROUGHPUT_MODE_1_MASK) >> DP_DSC_THROUGHPUT_MODE_1_SHIFT; + if (!dsc_throughput_from_dpcd(dpcd_throughput, &dsc_sink_caps->throughput_mode_1_mps)) + return false; + } + + dsc_sink_caps->max_slice_width = dpcd_dsc_basic_data[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 320; + dsc_sink_caps->slice_caps2.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT]; + + if (!dsc_bpp_increment_div_from_dpcd(dpcd_dsc_basic_data[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT], &dsc_sink_caps->bpp_increment_div)) + return false; + + /* Extended caps */ + if (dpcd_dsc_ext_data == NULL) { // Extended DPCD DSC data can be null, e.g. because it doesn't apply to SST + dsc_sink_caps->branch_overall_throughput_0_mps = 0; + dsc_sink_caps->branch_overall_throughput_1_mps = 0; + dsc_sink_caps->branch_max_line_width = 0; + return true; + } + + dsc_sink_caps->branch_overall_throughput_0_mps = dpcd_dsc_ext_data[DP_DSC_BRANCH_OVERALL_THROUGHPUT_0 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0]; + if (dsc_sink_caps->branch_overall_throughput_0_mps == 0) + dsc_sink_caps->branch_overall_throughput_0_mps = 0; + else if (dsc_sink_caps->branch_overall_throughput_0_mps == 1) + dsc_sink_caps->branch_overall_throughput_0_mps = 680; + else { + dsc_sink_caps->branch_overall_throughput_0_mps *= 50; + dsc_sink_caps->branch_overall_throughput_0_mps += 600; + } + + dsc_sink_caps->branch_overall_throughput_1_mps = dpcd_dsc_ext_data[DP_DSC_BRANCH_OVERALL_THROUGHPUT_1 - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0]; + if (dsc_sink_caps->branch_overall_throughput_1_mps == 0) + dsc_sink_caps->branch_overall_throughput_1_mps = 0; + else if (dsc_sink_caps->branch_overall_throughput_1_mps == 1) + dsc_sink_caps->branch_overall_throughput_1_mps = 680; + else { + dsc_sink_caps->branch_overall_throughput_1_mps *= 50; + dsc_sink_caps->branch_overall_throughput_1_mps += 600; + } + + dsc_sink_caps->branch_max_line_width = dpcd_dsc_ext_data[DP_DSC_BRANCH_MAX_LINE_WIDTH - DP_DSC_BRANCH_OVERALL_THROUGHPUT_0] * 320; + ASSERT(dsc_sink_caps->branch_max_line_width == 0 || dsc_sink_caps->branch_max_line_width >= 5120); + + return true; +} + + +/* If DSC is possbile, get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range and + * timing's pixel clock and uncompressed bandwidth. + * If DSC is not possible, leave '*range' untouched. + */ +bool dc_dsc_compute_bandwidth_range( + const struct dc *dc, + const uint32_t min_bpp, + const uint32_t max_bpp, + const struct dsc_dec_dpcd_caps *dsc_sink_caps, + const struct dc_crtc_timing *timing, + struct dc_dsc_bw_range *range) +{ + bool is_dsc_possible = false; + struct dsc_enc_caps dsc_enc_caps; + struct dsc_enc_caps dsc_common_caps; + struct dc_dsc_config config; + + get_dsc_enc_caps(dc, &dsc_enc_caps, timing->pix_clk_100hz); + + is_dsc_possible = intersect_dsc_caps(dsc_sink_caps, &dsc_enc_caps, + timing->pixel_encoding, &dsc_common_caps); + + if (is_dsc_possible) + is_dsc_possible = setup_dsc_config(dsc_sink_caps, + &dsc_enc_caps, + 0, + timing, &config); + + if (is_dsc_possible) + get_dsc_bandwidth_range(min_bpp, max_bpp, &dsc_common_caps, timing, range); + + return is_dsc_possible; +} + +bool dc_dsc_compute_config( + const struct dc *dc, + const struct dsc_dec_dpcd_caps *dsc_sink_caps, + uint32_t target_bandwidth_kbps, + const struct dc_crtc_timing *timing, + struct dc_dsc_config *dsc_cfg) +{ + bool is_dsc_possible = false; + struct dsc_enc_caps dsc_enc_caps; + + get_dsc_enc_caps(dc, &dsc_enc_caps, timing->pix_clk_100hz); + is_dsc_possible = setup_dsc_config(dsc_sink_caps, + &dsc_enc_caps, + target_bandwidth_kbps, + timing, dsc_cfg); + return is_dsc_possible; +} +#endif /* CONFIG_DRM_AMD_DC_DSC_SUPPORT */ |