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kernel/drivers/gpu/drm/amd/display/dc/link/link_validation.c

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/*
* Copyright 2023 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.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
* This file owns timing validation against various link limitations. (ex.
* link bandwidth, receiver capability or our hardware capability) It also
* provides helper functions exposing bandwidth formulas used in validation.
*/
#include "link_validation.h"
#include "protocols/link_dp_capability.h"
#include "protocols/link_dp_dpia_bw.h"
#include "resource.h"
#define DC_LOGGER_INIT(logger)
static uint32_t get_tmds_output_pixel_clock_100hz(const struct dc_crtc_timing *timing)
{
uint32_t pxl_clk = timing->pix_clk_100hz;
if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
pxl_clk /= 2;
else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
pxl_clk = pxl_clk * 2 / 3;
if (timing->display_color_depth == COLOR_DEPTH_101010)
pxl_clk = pxl_clk * 10 / 8;
else if (timing->display_color_depth == COLOR_DEPTH_121212)
pxl_clk = pxl_clk * 12 / 8;
return pxl_clk;
}
static bool dp_active_dongle_validate_timing(
const struct dc_crtc_timing *timing,
const struct dpcd_caps *dpcd_caps)
{
const struct dc_dongle_caps *dongle_caps = &dpcd_caps->dongle_caps;
switch (dpcd_caps->dongle_type) {
case DISPLAY_DONGLE_DP_VGA_CONVERTER:
case DISPLAY_DONGLE_DP_DVI_CONVERTER:
case DISPLAY_DONGLE_DP_DVI_DONGLE:
if (timing->pixel_encoding == PIXEL_ENCODING_RGB)
return true;
else
return false;
default:
break;
}
if (dpcd_caps->dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER &&
dongle_caps->extendedCapValid == true) {
/* Check Pixel Encoding */
switch (timing->pixel_encoding) {
case PIXEL_ENCODING_RGB:
case PIXEL_ENCODING_YCBCR444:
break;
case PIXEL_ENCODING_YCBCR422:
if (!dongle_caps->is_dp_hdmi_ycbcr422_pass_through)
return false;
break;
case PIXEL_ENCODING_YCBCR420:
if (!dongle_caps->is_dp_hdmi_ycbcr420_pass_through)
return false;
break;
default:
/* Invalid Pixel Encoding*/
return false;
}
switch (timing->display_color_depth) {
case COLOR_DEPTH_666:
case COLOR_DEPTH_888:
/*888 and 666 should always be supported*/
break;
case COLOR_DEPTH_101010:
if (dongle_caps->dp_hdmi_max_bpc < 10)
return false;
break;
case COLOR_DEPTH_121212:
if (dongle_caps->dp_hdmi_max_bpc < 12)
return false;
break;
case COLOR_DEPTH_141414:
case COLOR_DEPTH_161616:
default:
/* These color depths are currently not supported */
return false;
}
/* Check 3D format */
switch (timing->timing_3d_format) {
case TIMING_3D_FORMAT_NONE:
case TIMING_3D_FORMAT_FRAME_ALTERNATE:
/*Only frame alternate 3D is supported on active dongle*/
break;
default:
/*other 3D formats are not supported due to bad infoframe translation */
return false;
}
if (dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps > 0) { // DP to HDMI FRL converter
struct dc_crtc_timing outputTiming = *timing;
if (timing->flags.DSC && !timing->dsc_cfg.is_frl)
/* DP input has DSC, HDMI FRL output doesn't have DSC, remove DSC from output timing */
outputTiming.flags.DSC = 0;
if (dc_bandwidth_in_kbps_from_timing(&outputTiming, DC_LINK_ENCODING_HDMI_FRL) >
dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps)
return false;
} else { // DP to HDMI TMDS converter
if (get_tmds_output_pixel_clock_100hz(timing) > (dongle_caps->dp_hdmi_max_pixel_clk_in_khz * 10))
return false;
}
}
if (dpcd_caps->channel_coding_cap.bits.DP_128b_132b_SUPPORTED == 0 &&
dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT == 0 &&
dongle_caps->dfp_cap_ext.supported) {
if (dongle_caps->dfp_cap_ext.max_pixel_rate_in_mps < (timing->pix_clk_100hz / 10000))
return false;
if (dongle_caps->dfp_cap_ext.max_video_h_active_width < timing->h_addressable)
return false;
if (dongle_caps->dfp_cap_ext.max_video_v_active_height < timing->v_addressable)
return false;
if (timing->pixel_encoding == PIXEL_ENCODING_RGB) {
if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
return false;
if (timing->display_color_depth == COLOR_DEPTH_666 &&
!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_6bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_888 &&
!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_8bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_10bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_12bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_16bpc)
return false;
} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR444) {
if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
return false;
if (timing->display_color_depth == COLOR_DEPTH_888 &&
!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_8bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_10bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_12bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_16bpc)
return false;
} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) {
if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
return false;
if (timing->display_color_depth == COLOR_DEPTH_888 &&
!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_8bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_10bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_12bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_16bpc)
return false;
} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) {
if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
return false;
if (timing->display_color_depth == COLOR_DEPTH_888 &&
!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_8bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_10bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_12bpc)
return false;
else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_16bpc)
return false;
}
}
return true;
}
uint32_t dp_link_bandwidth_kbps(
const struct dc_link *link,
const struct dc_link_settings *link_settings)
{
uint32_t total_data_bw_efficiency_x10000 = 0;
uint32_t link_rate_per_lane_kbps = 0;
switch (link_dp_get_encoding_format(link_settings)) {
case DP_8b_10b_ENCODING:
/* For 8b/10b encoding:
* link rate is defined in the unit of LINK_RATE_REF_FREQ_IN_KHZ per DP byte per lane.
* data bandwidth efficiency is 80% with additional 3% overhead if FEC is supported.
*/
link_rate_per_lane_kbps = link_settings->link_rate * LINK_RATE_REF_FREQ_IN_KHZ * BITS_PER_DP_BYTE;
total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_8b_10b_x10000;
if (dp_should_enable_fec(link)) {
total_data_bw_efficiency_x10000 /= 100;
total_data_bw_efficiency_x10000 *= DATA_EFFICIENCY_8b_10b_FEC_EFFICIENCY_x100;
}
break;
case DP_128b_132b_ENCODING:
/* For 128b/132b encoding:
* link rate is defined in the unit of 10mbps per lane.
* total data bandwidth efficiency is always 96.71%.
*/
link_rate_per_lane_kbps = link_settings->link_rate * 10000;
total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_128b_132b_x10000;
break;
default:
break;
}
/* overall effective link bandwidth = link rate per lane * lane count * total data bandwidth efficiency */
return link_rate_per_lane_kbps * link_settings->lane_count / 10000 * total_data_bw_efficiency_x10000;
}
static bool dp_validate_mode_timing(
struct dc_link *link,
const struct dc_crtc_timing *timing)
{
uint32_t req_bw;
uint32_t max_bw;
const struct dc_link_settings *link_setting;
/* According to spec, VSC SDP should be used if pixel format is YCbCr420 */
if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 &&
!link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED &&
dal_graphics_object_id_get_connector_id(link->link_id) != CONNECTOR_ID_VIRTUAL)
return false;
/*always DP fail safe mode*/
if ((timing->pix_clk_100hz / 10) == (uint32_t) 25175 &&
timing->h_addressable == (uint32_t) 640 &&
timing->v_addressable == (uint32_t) 480)
return true;
link_setting = dp_get_verified_link_cap(link);
/* TODO: DYNAMIC_VALIDATION needs to be implemented */
/*if (flags.DYNAMIC_VALIDATION == 1 &&
link->verified_link_cap.lane_count != LANE_COUNT_UNKNOWN)
link_setting = &link->verified_link_cap;
*/
req_bw = dc_bandwidth_in_kbps_from_timing(timing, dc_link_get_highest_encoding_format(link));
max_bw = dp_link_bandwidth_kbps(link, link_setting);
bool is_max_uncompressed_pixel_rate_exceeded = link->dpcd_caps.max_uncompressed_pixel_rate_cap.bits.valid &&
timing->pix_clk_100hz > link->dpcd_caps.max_uncompressed_pixel_rate_cap.bits.max_uncompressed_pixel_rate_cap * 10000;
if (is_max_uncompressed_pixel_rate_exceeded && !timing->flags.DSC) {
return false;
}
if (req_bw <= max_bw) {
/* remember the biggest mode here, during
* initial link training (to get
* verified_link_cap), LS sends event about
* cannot train at reported cap to upper
* layer and upper layer will re-enumerate modes.
* this is not necessary if the lower
* verified_link_cap is enough to drive
* all the modes */
/* TODO: DYNAMIC_VALIDATION needs to be implemented */
/* if (flags.DYNAMIC_VALIDATION == 1)
dpsst->max_req_bw_for_verified_linkcap = dal_max(
dpsst->max_req_bw_for_verified_linkcap, req_bw); */
return true;
} else
return false;
}
enum dc_status link_validate_mode_timing(
const struct dc_stream_state *stream,
struct dc_link *link,
const struct dc_crtc_timing *timing)
{
uint32_t max_pix_clk = stream->link->dongle_max_pix_clk * 10;
struct dpcd_caps *dpcd_caps = &link->dpcd_caps;
/* A hack to avoid failing any modes for EDID override feature on
* topology change such as lower quality cable for DP or different dongle
*/
if (link->remote_sinks[0] && link->remote_sinks[0]->sink_signal == SIGNAL_TYPE_VIRTUAL)
return DC_OK;
/* Passive Dongle */
if (max_pix_clk != 0 && get_tmds_output_pixel_clock_100hz(timing) > max_pix_clk)
return DC_EXCEED_DONGLE_CAP;
/* Active Dongle*/
if (!dp_active_dongle_validate_timing(timing, dpcd_caps))
return DC_EXCEED_DONGLE_CAP;
switch (stream->signal) {
case SIGNAL_TYPE_EDP:
case SIGNAL_TYPE_DISPLAY_PORT:
if (!dp_validate_mode_timing(
link,
timing))
return DC_NO_DP_LINK_BANDWIDTH;
break;
default:
break;
}
return DC_OK;
}
/*
* This function calculates the bandwidth required for the stream timing
* and aggregates the stream bandwidth for the respective dpia link
*
* @stream: pointer to the dc_stream_state struct instance
* @num_streams: number of streams to be validated
*
* return: true if validation is succeeded
*/
bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const unsigned int num_streams)
{
int bw_needed[MAX_DPIA_NUM] = {0};
struct dc_link *dpia_link[MAX_DPIA_NUM] = {0};
int num_dpias = 0;
for (unsigned int i = 0; i < num_streams; ++i) {
if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT) {
/* new dpia sst stream, check whether it exceeds max dpia */
if (num_dpias >= MAX_DPIA_NUM)
return false;
dpia_link[num_dpias] = stream[i].link;
bw_needed[num_dpias] = dc_bandwidth_in_kbps_from_timing(&stream[i].timing,
dc_link_get_highest_encoding_format(dpia_link[num_dpias]));
num_dpias++;
} else if (stream[i].signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
uint8_t j = 0;
/* check whether its a known dpia link */
for (; j < num_dpias; ++j) {
if (dpia_link[j] == stream[i].link)
break;
}
if (j == num_dpias) {
/* new dpia mst stream, check whether it exceeds max dpia */
if (num_dpias >= MAX_DPIA_NUM)
return false;
else {
dpia_link[j] = stream[i].link;
num_dpias++;
}
}
bw_needed[j] += dc_bandwidth_in_kbps_from_timing(&stream[i].timing,
dc_link_get_highest_encoding_format(dpia_link[j]));
}
}
/* Include dp overheads */
for (uint8_t i = 0; i < num_dpias; ++i) {
int dp_overhead = 0;
dp_overhead = link_dp_dpia_get_dp_overhead_in_dp_tunneling(dpia_link[i]);
bw_needed[i] += dp_overhead;
}
return dpia_validate_usb4_bw(dpia_link, bw_needed, num_dpias);
}
struct dp_audio_layout_config {
uint8_t layouts_per_sample_denom;
uint8_t symbols_per_layout;
uint8_t max_layouts_per_audio_sdp;
};
static void get_audio_layout_config(
uint32_t channel_count,
enum dp_link_encoding encoding,
struct dp_audio_layout_config *output)
{
memset(output, 0, sizeof(struct dp_audio_layout_config));
/* Assuming L-PCM audio. Current implementation uses max 1 layout per SDP,
* with each layout being the same size (8ch layout).
*/
if (encoding == DP_8b_10b_ENCODING) {
if (channel_count == 2) {
output->layouts_per_sample_denom = 4;
output->symbols_per_layout = 40;
output->max_layouts_per_audio_sdp = 1;
} else if (channel_count == 8 || channel_count == 6) {
output->layouts_per_sample_denom = 1;
output->symbols_per_layout = 40;
output->max_layouts_per_audio_sdp = 1;
}
} else if (encoding == DP_128b_132b_ENCODING) {
if (channel_count == 2) {
output->layouts_per_sample_denom = 4;
output->symbols_per_layout = 10;
output->max_layouts_per_audio_sdp = 1;
} else if (channel_count == 8 || channel_count == 6) {
output->layouts_per_sample_denom = 1;
output->symbols_per_layout = 10;
output->max_layouts_per_audio_sdp = 1;
}
}
}
static uint32_t get_av_stream_map_lane_count(
enum dp_link_encoding encoding,
enum dc_lane_count lane_count,
bool is_mst)
{
uint32_t av_stream_map_lane_count = 0;
if (encoding == DP_8b_10b_ENCODING) {
if (!is_mst)
av_stream_map_lane_count = lane_count;
else
av_stream_map_lane_count = 4;
} else if (encoding == DP_128b_132b_ENCODING) {
av_stream_map_lane_count = 4;
}
ASSERT(av_stream_map_lane_count != 0);
return av_stream_map_lane_count;
}
static uint32_t get_audio_sdp_overhead(
enum dp_link_encoding encoding,
enum dc_lane_count lane_count,
bool is_mst)
{
uint32_t audio_sdp_overhead = 0;
if (encoding == DP_8b_10b_ENCODING) {
if (is_mst)
audio_sdp_overhead = 16; /* 4 * 2 + 8 */
else
audio_sdp_overhead = lane_count * 2 + 8;
} else if (encoding == DP_128b_132b_ENCODING) {
audio_sdp_overhead = 10; /* 4 x 2.5 */
}
ASSERT(audio_sdp_overhead != 0);
return audio_sdp_overhead;
}
/* Current calculation only applicable for 8b/10b MST and 128b/132b SST/MST.
*/
static uint32_t calculate_overhead_hblank_bw_in_symbols(
uint32_t max_slice_h)
{
uint32_t overhead_hblank_bw = 0; /* in stream symbols */
overhead_hblank_bw += max_slice_h * 4; /* EOC overhead */
overhead_hblank_bw += 12; /* Main link overhead (VBID, BS/BE) */
return overhead_hblank_bw;
}
uint32_t dp_required_hblank_size_bytes(
const struct dc_link *link,
struct dp_audio_bandwidth_params *audio_params)
{
/* Main logic from dce_audio is duplicated here, with the main
* difference being:
* - Pre-determined lane count of 4
* - Assumed 16 dsc slices for worst case
* - Assumed SDP split disabled for worst case
* TODO: Unify logic from dce_audio to prevent duplicated logic.
*/
const struct dc_crtc_timing *timing = audio_params->crtc_timing;
const uint32_t channel_count = audio_params->channel_count;
const uint32_t sample_rate_hz = audio_params->sample_rate_hz;
const enum dp_link_encoding link_encoding = audio_params->link_encoding;
// 8b/10b MST and 128b/132b are always 4 logical lanes.
const uint32_t lane_count = 4;
const bool is_mst = (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT);
// Maximum slice count is with ODM 4:1, 4 slices per DSC
const uint32_t max_slices_h = 16;
const uint32_t av_stream_map_lane_count = get_av_stream_map_lane_count(
link_encoding, lane_count, is_mst);
const uint32_t audio_sdp_overhead = get_audio_sdp_overhead(
link_encoding, lane_count, is_mst);
struct dp_audio_layout_config layout_config;
if (link_encoding == DP_8b_10b_ENCODING && link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT)
return 0;
get_audio_layout_config(
channel_count, link_encoding, &layout_config);
/* DP spec recommends between 1.05 to 1.1 safety margin to prevent sample under-run */
struct fixed31_32 audio_sdp_margin = dc_fixpt_from_fraction(110, 100);
struct fixed31_32 horizontal_line_freq_khz = dc_fixpt_from_fraction(
timing->pix_clk_100hz, (long long)timing->h_total * 10);
struct fixed31_32 samples_per_line;
struct fixed31_32 layouts_per_line;
struct fixed31_32 symbols_per_sdp_max_layout;
struct fixed31_32 remainder;
uint32_t num_sdp_with_max_layouts;
uint32_t required_symbols_per_hblank;
uint32_t required_bytes_per_hblank = 0;
samples_per_line = dc_fixpt_from_fraction(sample_rate_hz, 1000);
samples_per_line = dc_fixpt_div(samples_per_line, horizontal_line_freq_khz);
layouts_per_line = dc_fixpt_div_int(samples_per_line, layout_config.layouts_per_sample_denom);
// HBlank expansion usage assumes SDP split disabled to allow for worst case.
layouts_per_line = dc_fixpt_from_int(dc_fixpt_ceil(layouts_per_line));
num_sdp_with_max_layouts = dc_fixpt_floor(
dc_fixpt_div_int(layouts_per_line, layout_config.max_layouts_per_audio_sdp));
symbols_per_sdp_max_layout = dc_fixpt_from_int(
layout_config.max_layouts_per_audio_sdp * layout_config.symbols_per_layout);
symbols_per_sdp_max_layout = dc_fixpt_add_int(symbols_per_sdp_max_layout, audio_sdp_overhead);
symbols_per_sdp_max_layout = dc_fixpt_mul(symbols_per_sdp_max_layout, audio_sdp_margin);
required_symbols_per_hblank = num_sdp_with_max_layouts;
required_symbols_per_hblank *= ((dc_fixpt_ceil(symbols_per_sdp_max_layout) + av_stream_map_lane_count) /
av_stream_map_lane_count) * av_stream_map_lane_count;
if (num_sdp_with_max_layouts != dc_fixpt_ceil(
dc_fixpt_div_int(layouts_per_line, layout_config.max_layouts_per_audio_sdp))) {
remainder = dc_fixpt_sub_int(layouts_per_line,
num_sdp_with_max_layouts * layout_config.max_layouts_per_audio_sdp);
remainder = dc_fixpt_mul_int(remainder, layout_config.symbols_per_layout);
remainder = dc_fixpt_add_int(remainder, audio_sdp_overhead);
remainder = dc_fixpt_mul(remainder, audio_sdp_margin);
required_symbols_per_hblank += ((dc_fixpt_ceil(remainder) + av_stream_map_lane_count) /
av_stream_map_lane_count) * av_stream_map_lane_count;
}
required_symbols_per_hblank += calculate_overhead_hblank_bw_in_symbols(max_slices_h);
if (link_encoding == DP_8b_10b_ENCODING)
required_bytes_per_hblank = required_symbols_per_hblank; // 8 bits per 8b/10b symbol
else if (link_encoding == DP_128b_132b_ENCODING)
required_bytes_per_hblank = required_symbols_per_hblank * 4; // 32 bits per 128b/132b symbol
return required_bytes_per_hblank;
}
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