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linux-zen-server/drivers/gpu/drm/msm/dp/dp_ctrl.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
#include <linux/types.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-dp.h>
#include <linux/pm_opp.h>
#include <drm/display/drm_dp_helper.h>
#include <drm/drm_fixed.h>
#include <drm/drm_print.h>
#include "dp_reg.h"
#include "dp_ctrl.h"
#include "dp_link.h"
#define DP_KHZ_TO_HZ 1000
#define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES (30 * HZ / 1000) /* 30 ms */
#define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)
#define DP_CTRL_INTR_READY_FOR_VIDEO BIT(0)
#define DP_CTRL_INTR_IDLE_PATTERN_SENT BIT(3)
#define MR_LINK_TRAINING1 0x8
#define MR_LINK_SYMBOL_ERM 0x80
#define MR_LINK_PRBS7 0x100
#define MR_LINK_CUSTOM80 0x200
#define MR_LINK_TRAINING4 0x40
enum {
DP_TRAINING_NONE,
DP_TRAINING_1,
DP_TRAINING_2,
};
struct dp_tu_calc_input {
u64 lclk; /* 162, 270, 540 and 810 */
u64 pclk_khz; /* in KHz */
u64 hactive; /* active h-width */
u64 hporch; /* bp + fp + pulse */
int nlanes; /* no.of.lanes */
int bpp; /* bits */
int pixel_enc; /* 444, 420, 422 */
int dsc_en; /* dsc on/off */
int async_en; /* async mode */
int fec_en; /* fec */
int compress_ratio; /* 2:1 = 200, 3:1 = 300, 3.75:1 = 375 */
int num_of_dsc_slices; /* number of slices per line */
};
struct dp_vc_tu_mapping_table {
u32 vic;
u8 lanes;
u8 lrate; /* DP_LINK_RATE -> 162(6), 270(10), 540(20), 810 (30) */
u8 bpp;
u8 valid_boundary_link;
u16 delay_start_link;
bool boundary_moderation_en;
u8 valid_lower_boundary_link;
u8 upper_boundary_count;
u8 lower_boundary_count;
u8 tu_size_minus1;
};
struct dp_ctrl_private {
struct dp_ctrl dp_ctrl;
struct drm_device *drm_dev;
struct device *dev;
struct drm_dp_aux *aux;
struct dp_panel *panel;
struct dp_link *link;
struct dp_power *power;
struct dp_parser *parser;
struct dp_catalog *catalog;
struct completion idle_comp;
struct completion video_comp;
};
static int dp_aux_link_configure(struct drm_dp_aux *aux,
struct dp_link_info *link)
{
u8 values[2];
int err;
values[0] = drm_dp_link_rate_to_bw_code(link->rate);
values[1] = link->num_lanes;
if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
if (err < 0)
return err;
return 0;
}
void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
reinit_completion(&ctrl->idle_comp);
dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_PUSH_IDLE);
if (!wait_for_completion_timeout(&ctrl->idle_comp,
IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES))
pr_warn("PUSH_IDLE pattern timedout\n");
drm_dbg_dp(ctrl->drm_dev, "mainlink off\n");
}
static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
{
u32 config = 0, tbd;
const u8 *dpcd = ctrl->panel->dpcd;
/* Default-> LSCLK DIV: 1/4 LCLK */
config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT);
/* Scrambler reset enable */
if (drm_dp_alternate_scrambler_reset_cap(dpcd))
config |= DP_CONFIGURATION_CTRL_ASSR;
tbd = dp_link_get_test_bits_depth(ctrl->link,
ctrl->panel->dp_mode.bpp);
if (tbd == DP_TEST_BIT_DEPTH_UNKNOWN) {
pr_debug("BIT_DEPTH not set. Configure default\n");
tbd = DP_TEST_BIT_DEPTH_8;
}
config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT;
/* Num of Lanes */
config |= ((ctrl->link->link_params.num_lanes - 1)
<< DP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT);
if (drm_dp_enhanced_frame_cap(dpcd))
config |= DP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
config |= DP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */
/* sync clock & static Mvid */
config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;
dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
}
static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
{
u32 cc, tb;
dp_catalog_ctrl_lane_mapping(ctrl->catalog);
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
dp_ctrl_config_ctrl(ctrl);
tb = dp_link_get_test_bits_depth(ctrl->link,
ctrl->panel->dp_mode.bpp);
cc = dp_link_get_colorimetry_config(ctrl->link);
dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
dp_panel_timing_cfg(ctrl->panel);
}
/*
* The structure and few functions present below are IP/Hardware
* specific implementation. Most of the implementation will not
* have coding comments
*/
struct tu_algo_data {
s64 lclk_fp;
s64 pclk_fp;
s64 lwidth;
s64 lwidth_fp;
s64 hbp_relative_to_pclk;
s64 hbp_relative_to_pclk_fp;
int nlanes;
int bpp;
int pixelEnc;
int dsc_en;
int async_en;
int bpc;
uint delay_start_link_extra_pixclk;
int extra_buffer_margin;
s64 ratio_fp;
s64 original_ratio_fp;
s64 err_fp;
s64 n_err_fp;
s64 n_n_err_fp;
int tu_size;
int tu_size_desired;
int tu_size_minus1;
int valid_boundary_link;
s64 resulting_valid_fp;
s64 total_valid_fp;
s64 effective_valid_fp;
s64 effective_valid_recorded_fp;
int n_tus;
int n_tus_per_lane;
int paired_tus;
int remainder_tus;
int remainder_tus_upper;
int remainder_tus_lower;
int extra_bytes;
int filler_size;
int delay_start_link;
int extra_pclk_cycles;
int extra_pclk_cycles_in_link_clk;
s64 ratio_by_tu_fp;
s64 average_valid2_fp;
int new_valid_boundary_link;
int remainder_symbols_exist;
int n_symbols;
s64 n_remainder_symbols_per_lane_fp;
s64 last_partial_tu_fp;
s64 TU_ratio_err_fp;
int n_tus_incl_last_incomplete_tu;
int extra_pclk_cycles_tmp;
int extra_pclk_cycles_in_link_clk_tmp;
int extra_required_bytes_new_tmp;
int filler_size_tmp;
int lower_filler_size_tmp;
int delay_start_link_tmp;
bool boundary_moderation_en;
int boundary_mod_lower_err;
int upper_boundary_count;
int lower_boundary_count;
int i_upper_boundary_count;
int i_lower_boundary_count;
int valid_lower_boundary_link;
int even_distribution_BF;
int even_distribution_legacy;
int even_distribution;
int min_hblank_violated;
s64 delay_start_time_fp;
s64 hbp_time_fp;
s64 hactive_time_fp;
s64 diff_abs_fp;
s64 ratio;
};
static int _tu_param_compare(s64 a, s64 b)
{
u32 a_sign;
u32 b_sign;
s64 a_temp, b_temp, minus_1;
if (a == b)
return 0;
minus_1 = drm_fixp_from_fraction(-1, 1);
a_sign = (a >> 32) & 0x80000000 ? 1 : 0;
b_sign = (b >> 32) & 0x80000000 ? 1 : 0;
if (a_sign > b_sign)
return 2;
else if (b_sign > a_sign)
return 1;
if (!a_sign && !b_sign) { /* positive */
if (a > b)
return 1;
else
return 2;
} else { /* negative */
a_temp = drm_fixp_mul(a, minus_1);
b_temp = drm_fixp_mul(b, minus_1);
if (a_temp > b_temp)
return 2;
else
return 1;
}
}
static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in,
struct tu_algo_data *tu)
{
int nlanes = in->nlanes;
int dsc_num_slices = in->num_of_dsc_slices;
int dsc_num_bytes = 0;
int numerator;
s64 pclk_dsc_fp;
s64 dwidth_dsc_fp;
s64 hbp_dsc_fp;
int tot_num_eoc_symbols = 0;
int tot_num_hor_bytes = 0;
int tot_num_dummy_bytes = 0;
int dwidth_dsc_bytes = 0;
int eoc_bytes = 0;
s64 temp1_fp, temp2_fp, temp3_fp;
tu->lclk_fp = drm_fixp_from_fraction(in->lclk, 1);
tu->pclk_fp = drm_fixp_from_fraction(in->pclk_khz, 1000);
tu->lwidth = in->hactive;
tu->hbp_relative_to_pclk = in->hporch;
tu->nlanes = in->nlanes;
tu->bpp = in->bpp;
tu->pixelEnc = in->pixel_enc;
tu->dsc_en = in->dsc_en;
tu->async_en = in->async_en;
tu->lwidth_fp = drm_fixp_from_fraction(in->hactive, 1);
tu->hbp_relative_to_pclk_fp = drm_fixp_from_fraction(in->hporch, 1);
if (tu->pixelEnc == 420) {
temp1_fp = drm_fixp_from_fraction(2, 1);
tu->pclk_fp = drm_fixp_div(tu->pclk_fp, temp1_fp);
tu->lwidth_fp = drm_fixp_div(tu->lwidth_fp, temp1_fp);
tu->hbp_relative_to_pclk_fp =
drm_fixp_div(tu->hbp_relative_to_pclk_fp, 2);
}
if (tu->pixelEnc == 422) {
switch (tu->bpp) {
case 24:
tu->bpp = 16;
tu->bpc = 8;
break;
case 30:
tu->bpp = 20;
tu->bpc = 10;
break;
default:
tu->bpp = 16;
tu->bpc = 8;
break;
}
} else {
tu->bpc = tu->bpp/3;
}
if (!in->dsc_en)
goto fec_check;
temp1_fp = drm_fixp_from_fraction(in->compress_ratio, 100);
temp2_fp = drm_fixp_from_fraction(in->bpp, 1);
temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);
temp2_fp = drm_fixp_mul(tu->lwidth_fp, temp3_fp);
temp1_fp = drm_fixp_from_fraction(8, 1);
temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);
numerator = drm_fixp2int(temp3_fp);
dsc_num_bytes = numerator / dsc_num_slices;
eoc_bytes = dsc_num_bytes % nlanes;
tot_num_eoc_symbols = nlanes * dsc_num_slices;
tot_num_hor_bytes = dsc_num_bytes * dsc_num_slices;
tot_num_dummy_bytes = (nlanes - eoc_bytes) * dsc_num_slices;
if (dsc_num_bytes == 0)
pr_info("incorrect no of bytes per slice=%d\n", dsc_num_bytes);
dwidth_dsc_bytes = (tot_num_hor_bytes +
tot_num_eoc_symbols +
(eoc_bytes == 0 ? 0 : tot_num_dummy_bytes));
dwidth_dsc_fp = drm_fixp_from_fraction(dwidth_dsc_bytes, 3);
temp2_fp = drm_fixp_mul(tu->pclk_fp, dwidth_dsc_fp);
temp1_fp = drm_fixp_div(temp2_fp, tu->lwidth_fp);
pclk_dsc_fp = temp1_fp;
temp1_fp = drm_fixp_div(pclk_dsc_fp, tu->pclk_fp);
temp2_fp = drm_fixp_mul(tu->hbp_relative_to_pclk_fp, temp1_fp);
hbp_dsc_fp = temp2_fp;
/* output */
tu->pclk_fp = pclk_dsc_fp;
tu->lwidth_fp = dwidth_dsc_fp;
tu->hbp_relative_to_pclk_fp = hbp_dsc_fp;
fec_check:
if (in->fec_en) {
temp1_fp = drm_fixp_from_fraction(976, 1000); /* 0.976 */
tu->lclk_fp = drm_fixp_mul(tu->lclk_fp, temp1_fp);
}
}
static void _tu_valid_boundary_calc(struct tu_algo_data *tu)
{
s64 temp1_fp, temp2_fp, temp, temp1, temp2;
int compare_result_1, compare_result_2, compare_result_3;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
tu->new_valid_boundary_link = drm_fixp2int_ceil(temp2_fp);
temp = (tu->i_upper_boundary_count *
tu->new_valid_boundary_link +
tu->i_lower_boundary_count *
(tu->new_valid_boundary_link-1));
tu->average_valid2_fp = drm_fixp_from_fraction(temp,
(tu->i_upper_boundary_count +
tu->i_lower_boundary_count));
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp2_fp = tu->lwidth_fp;
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);
tu->n_tus = drm_fixp2int(temp2_fp);
if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
tu->n_tus += 1;
temp1_fp = drm_fixp_from_fraction(tu->n_tus, 1);
temp2_fp = drm_fixp_mul(temp1_fp, tu->average_valid2_fp);
temp1_fp = drm_fixp_from_fraction(tu->n_symbols, 1);
temp2_fp = temp1_fp - temp2_fp;
temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
tu->n_remainder_symbols_per_lane_fp = temp2_fp;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
tu->last_partial_tu_fp =
drm_fixp_div(tu->n_remainder_symbols_per_lane_fp,
temp1_fp);
if (tu->n_remainder_symbols_per_lane_fp != 0)
tu->remainder_symbols_exist = 1;
else
tu->remainder_symbols_exist = 0;
temp1_fp = drm_fixp_from_fraction(tu->n_tus, tu->nlanes);
tu->n_tus_per_lane = drm_fixp2int(temp1_fp);
tu->paired_tus = (int)((tu->n_tus_per_lane) /
(tu->i_upper_boundary_count +
tu->i_lower_boundary_count));
tu->remainder_tus = tu->n_tus_per_lane - tu->paired_tus *
(tu->i_upper_boundary_count +
tu->i_lower_boundary_count);
if ((tu->remainder_tus - tu->i_upper_boundary_count) > 0) {
tu->remainder_tus_upper = tu->i_upper_boundary_count;
tu->remainder_tus_lower = tu->remainder_tus -
tu->i_upper_boundary_count;
} else {
tu->remainder_tus_upper = tu->remainder_tus;
tu->remainder_tus_lower = 0;
}
temp = tu->paired_tus * (tu->i_upper_boundary_count *
tu->new_valid_boundary_link +
tu->i_lower_boundary_count *
(tu->new_valid_boundary_link - 1)) +
(tu->remainder_tus_upper *
tu->new_valid_boundary_link) +
(tu->remainder_tus_lower *
(tu->new_valid_boundary_link - 1));
tu->total_valid_fp = drm_fixp_from_fraction(temp, 1);
if (tu->remainder_symbols_exist) {
temp1_fp = tu->total_valid_fp +
tu->n_remainder_symbols_per_lane_fp;
temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
temp2_fp = temp2_fp + tu->last_partial_tu_fp;
temp1_fp = drm_fixp_div(temp1_fp, temp2_fp);
} else {
temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
temp1_fp = drm_fixp_div(tu->total_valid_fp, temp2_fp);
}
tu->effective_valid_fp = temp1_fp;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
tu->n_n_err_fp = tu->effective_valid_fp - temp2_fp;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
tu->n_err_fp = tu->average_valid2_fp - temp2_fp;
tu->even_distribution = tu->n_tus % tu->nlanes == 0 ? 1 : 0;
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp2_fp = tu->lwidth_fp;
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);
if (temp2_fp)
tu->n_tus_incl_last_incomplete_tu = drm_fixp2int_ceil(temp2_fp);
else
tu->n_tus_incl_last_incomplete_tu = 0;
temp1 = 0;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
temp1_fp = tu->average_valid2_fp - temp2_fp;
temp2_fp = drm_fixp_from_fraction(tu->n_tus_incl_last_incomplete_tu, 1);
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
if (temp1_fp)
temp1 = drm_fixp2int_ceil(temp1_fp);
temp = tu->i_upper_boundary_count * tu->nlanes;
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
temp1_fp = drm_fixp_from_fraction(tu->new_valid_boundary_link, 1);
temp2_fp = temp1_fp - temp2_fp;
temp1_fp = drm_fixp_from_fraction(temp, 1);
temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
if (temp2_fp)
temp2 = drm_fixp2int_ceil(temp2_fp);
else
temp2 = 0;
tu->extra_required_bytes_new_tmp = (int)(temp1 + temp2);
temp1_fp = drm_fixp_from_fraction(8, tu->bpp);
temp2_fp = drm_fixp_from_fraction(
tu->extra_required_bytes_new_tmp, 1);
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
if (temp1_fp)
tu->extra_pclk_cycles_tmp = drm_fixp2int_ceil(temp1_fp);
else
tu->extra_pclk_cycles_tmp = 0;
temp1_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles_tmp, 1);
temp2_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);
if (temp1_fp)
tu->extra_pclk_cycles_in_link_clk_tmp =
drm_fixp2int_ceil(temp1_fp);
else
tu->extra_pclk_cycles_in_link_clk_tmp = 0;
tu->filler_size_tmp = tu->tu_size - tu->new_valid_boundary_link;
tu->lower_filler_size_tmp = tu->filler_size_tmp + 1;
tu->delay_start_link_tmp = tu->extra_pclk_cycles_in_link_clk_tmp +
tu->lower_filler_size_tmp +
tu->extra_buffer_margin;
temp1_fp = drm_fixp_from_fraction(tu->delay_start_link_tmp, 1);
tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
compare_result_1 = _tu_param_compare(tu->n_n_err_fp, tu->diff_abs_fp);
if (compare_result_1 == 2)
compare_result_1 = 1;
else
compare_result_1 = 0;
compare_result_2 = _tu_param_compare(tu->n_n_err_fp, tu->err_fp);
if (compare_result_2 == 2)
compare_result_2 = 1;
else
compare_result_2 = 0;
compare_result_3 = _tu_param_compare(tu->hbp_time_fp,
tu->delay_start_time_fp);
if (compare_result_3 == 2)
compare_result_3 = 0;
else
compare_result_3 = 1;
if (((tu->even_distribution == 1) ||
((tu->even_distribution_BF == 0) &&
(tu->even_distribution_legacy == 0))) &&
tu->n_err_fp >= 0 && tu->n_n_err_fp >= 0 &&
compare_result_2 &&
(compare_result_1 || (tu->min_hblank_violated == 1)) &&
(tu->new_valid_boundary_link - 1) > 0 &&
compare_result_3 &&
(tu->delay_start_link_tmp <= 1023)) {
tu->upper_boundary_count = tu->i_upper_boundary_count;
tu->lower_boundary_count = tu->i_lower_boundary_count;
tu->err_fp = tu->n_n_err_fp;
tu->boundary_moderation_en = true;
tu->tu_size_desired = tu->tu_size;
tu->valid_boundary_link = tu->new_valid_boundary_link;
tu->effective_valid_recorded_fp = tu->effective_valid_fp;
tu->even_distribution_BF = 1;
tu->delay_start_link = tu->delay_start_link_tmp;
} else if (tu->boundary_mod_lower_err == 0) {
compare_result_1 = _tu_param_compare(tu->n_n_err_fp,
tu->diff_abs_fp);
if (compare_result_1 == 2)
tu->boundary_mod_lower_err = 1;
}
}
static void _dp_ctrl_calc_tu(struct dp_ctrl_private *ctrl,
struct dp_tu_calc_input *in,
struct dp_vc_tu_mapping_table *tu_table)
{
struct tu_algo_data *tu;
int compare_result_1, compare_result_2;
u64 temp = 0;
s64 temp_fp = 0, temp1_fp = 0, temp2_fp = 0;
s64 LCLK_FAST_SKEW_fp = drm_fixp_from_fraction(6, 10000); /* 0.0006 */
s64 const_p49_fp = drm_fixp_from_fraction(49, 100); /* 0.49 */
s64 const_p56_fp = drm_fixp_from_fraction(56, 100); /* 0.56 */
s64 RATIO_SCALE_fp = drm_fixp_from_fraction(1001, 1000);
u8 DP_BRUTE_FORCE = 1;
s64 BRUTE_FORCE_THRESHOLD_fp = drm_fixp_from_fraction(1, 10); /* 0.1 */
uint EXTRA_PIXCLK_CYCLE_DELAY = 4;
uint HBLANK_MARGIN = 4;
tu = kzalloc(sizeof(*tu), GFP_KERNEL);
if (!tu)
return;
dp_panel_update_tu_timings(in, tu);
tu->err_fp = drm_fixp_from_fraction(1000, 1); /* 1000 */
temp1_fp = drm_fixp_from_fraction(4, 1);
temp2_fp = drm_fixp_mul(temp1_fp, tu->lclk_fp);
temp_fp = drm_fixp_div(temp2_fp, tu->pclk_fp);
tu->extra_buffer_margin = drm_fixp2int_ceil(temp_fp);
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp2_fp = drm_fixp_mul(tu->pclk_fp, temp1_fp);
temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
tu->ratio_fp = drm_fixp_div(temp2_fp, tu->lclk_fp);
tu->original_ratio_fp = tu->ratio_fp;
tu->boundary_moderation_en = false;
tu->upper_boundary_count = 0;
tu->lower_boundary_count = 0;
tu->i_upper_boundary_count = 0;
tu->i_lower_boundary_count = 0;
tu->valid_lower_boundary_link = 0;
tu->even_distribution_BF = 0;
tu->even_distribution_legacy = 0;
tu->even_distribution = 0;
tu->delay_start_time_fp = 0;
tu->err_fp = drm_fixp_from_fraction(1000, 1);
tu->n_err_fp = 0;
tu->n_n_err_fp = 0;
tu->ratio = drm_fixp2int(tu->ratio_fp);
temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
div64_u64_rem(tu->lwidth_fp, temp1_fp, &temp2_fp);
if (temp2_fp != 0 &&
!tu->ratio && tu->dsc_en == 0) {
tu->ratio_fp = drm_fixp_mul(tu->ratio_fp, RATIO_SCALE_fp);
tu->ratio = drm_fixp2int(tu->ratio_fp);
if (tu->ratio)
tu->ratio_fp = drm_fixp_from_fraction(1, 1);
}
if (tu->ratio > 1)
tu->ratio = 1;
if (tu->ratio == 1)
goto tu_size_calc;
compare_result_1 = _tu_param_compare(tu->ratio_fp, const_p49_fp);
if (!compare_result_1 || compare_result_1 == 1)
compare_result_1 = 1;
else
compare_result_1 = 0;
compare_result_2 = _tu_param_compare(tu->ratio_fp, const_p56_fp);
if (!compare_result_2 || compare_result_2 == 2)
compare_result_2 = 1;
else
compare_result_2 = 0;
if (tu->dsc_en && compare_result_1 && compare_result_2) {
HBLANK_MARGIN += 4;
drm_dbg_dp(ctrl->drm_dev,
"increase HBLANK_MARGIN to %d\n", HBLANK_MARGIN);
}
tu_size_calc:
for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
temp = drm_fixp2int_ceil(temp2_fp);
temp1_fp = drm_fixp_from_fraction(temp, 1);
tu->n_err_fp = temp1_fp - temp2_fp;
if (tu->n_err_fp < tu->err_fp) {
tu->err_fp = tu->n_err_fp;
tu->tu_size_desired = tu->tu_size;
}
}
tu->tu_size_minus1 = tu->tu_size_desired - 1;
temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
tu->valid_boundary_link = drm_fixp2int_ceil(temp2_fp);
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp2_fp = tu->lwidth_fp;
temp2_fp = drm_fixp_mul(temp2_fp, temp1_fp);
temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
tu->n_tus = drm_fixp2int(temp2_fp);
if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
tu->n_tus += 1;
tu->even_distribution_legacy = tu->n_tus % tu->nlanes == 0 ? 1 : 0;
drm_dbg_dp(ctrl->drm_dev,
"n_sym = %d, num_of_tus = %d\n",
tu->valid_boundary_link, tu->n_tus);
temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
temp2_fp = temp1_fp - temp2_fp;
temp1_fp = drm_fixp_from_fraction(tu->n_tus + 1, 1);
temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
temp = drm_fixp2int(temp2_fp);
if (temp && temp2_fp)
tu->extra_bytes = drm_fixp2int_ceil(temp2_fp);
else
tu->extra_bytes = 0;
temp1_fp = drm_fixp_from_fraction(tu->extra_bytes, 1);
temp2_fp = drm_fixp_from_fraction(8, tu->bpp);
temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);
if (temp && temp1_fp)
tu->extra_pclk_cycles = drm_fixp2int_ceil(temp1_fp);
else
tu->extra_pclk_cycles = drm_fixp2int(temp1_fp);
temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
temp2_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles, 1);
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
if (temp1_fp)
tu->extra_pclk_cycles_in_link_clk = drm_fixp2int_ceil(temp1_fp);
else
tu->extra_pclk_cycles_in_link_clk = drm_fixp2int(temp1_fp);
tu->filler_size = tu->tu_size_desired - tu->valid_boundary_link;
temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
tu->ratio_by_tu_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
tu->delay_start_link = tu->extra_pclk_cycles_in_link_clk +
tu->filler_size + tu->extra_buffer_margin;
tu->resulting_valid_fp =
drm_fixp_from_fraction(tu->valid_boundary_link, 1);
temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
temp2_fp = drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;
temp1_fp = drm_fixp_from_fraction(HBLANK_MARGIN, 1);
temp1_fp = tu->hbp_relative_to_pclk_fp - temp1_fp;
tu->hbp_time_fp = drm_fixp_div(temp1_fp, tu->pclk_fp);
temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
compare_result_1 = _tu_param_compare(tu->hbp_time_fp,
tu->delay_start_time_fp);
if (compare_result_1 == 2) /* if (hbp_time_fp < delay_start_time_fp) */
tu->min_hblank_violated = 1;
tu->hactive_time_fp = drm_fixp_div(tu->lwidth_fp, tu->pclk_fp);
compare_result_2 = _tu_param_compare(tu->hactive_time_fp,
tu->delay_start_time_fp);
if (compare_result_2 == 2)
tu->min_hblank_violated = 1;
tu->delay_start_time_fp = 0;
/* brute force */
tu->delay_start_link_extra_pixclk = EXTRA_PIXCLK_CYCLE_DELAY;
tu->diff_abs_fp = tu->resulting_valid_fp - tu->ratio_by_tu_fp;
temp = drm_fixp2int(tu->diff_abs_fp);
if (!temp && tu->diff_abs_fp <= 0xffff)
tu->diff_abs_fp = 0;
/* if(diff_abs < 0) diff_abs *= -1 */
if (tu->diff_abs_fp < 0)
tu->diff_abs_fp = drm_fixp_mul(tu->diff_abs_fp, -1);
tu->boundary_mod_lower_err = 0;
if ((tu->diff_abs_fp != 0 &&
((tu->diff_abs_fp > BRUTE_FORCE_THRESHOLD_fp) ||
(tu->even_distribution_legacy == 0) ||
(DP_BRUTE_FORCE == 1))) ||
(tu->min_hblank_violated == 1)) {
do {
tu->err_fp = drm_fixp_from_fraction(1000, 1);
temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
temp2_fp = drm_fixp_from_fraction(
tu->delay_start_link_extra_pixclk, 1);
temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
if (temp1_fp)
tu->extra_buffer_margin =
drm_fixp2int_ceil(temp1_fp);
else
tu->extra_buffer_margin = 0;
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);
if (temp1_fp)
tu->n_symbols = drm_fixp2int_ceil(temp1_fp);
else
tu->n_symbols = 0;
for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
for (tu->i_upper_boundary_count = 1;
tu->i_upper_boundary_count <= 15;
tu->i_upper_boundary_count++) {
for (tu->i_lower_boundary_count = 1;
tu->i_lower_boundary_count <= 15;
tu->i_lower_boundary_count++) {
_tu_valid_boundary_calc(tu);
}
}
}
tu->delay_start_link_extra_pixclk--;
} while (tu->boundary_moderation_en != true &&
tu->boundary_mod_lower_err == 1 &&
tu->delay_start_link_extra_pixclk != 0);
if (tu->boundary_moderation_en == true) {
temp1_fp = drm_fixp_from_fraction(
(tu->upper_boundary_count *
tu->valid_boundary_link +
tu->lower_boundary_count *
(tu->valid_boundary_link - 1)), 1);
temp2_fp = drm_fixp_from_fraction(
(tu->upper_boundary_count +
tu->lower_boundary_count), 1);
tu->resulting_valid_fp =
drm_fixp_div(temp1_fp, temp2_fp);
temp1_fp = drm_fixp_from_fraction(
tu->tu_size_desired, 1);
tu->ratio_by_tu_fp =
drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
tu->valid_lower_boundary_link =
tu->valid_boundary_link - 1;
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);
temp2_fp = drm_fixp_div(temp1_fp,
tu->resulting_valid_fp);
tu->n_tus = drm_fixp2int(temp2_fp);
tu->tu_size_minus1 = tu->tu_size_desired - 1;
tu->even_distribution_BF = 1;
temp1_fp =
drm_fixp_from_fraction(tu->tu_size_desired, 1);
temp2_fp =
drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;
}
}
temp2_fp = drm_fixp_mul(LCLK_FAST_SKEW_fp, tu->lwidth_fp);
if (temp2_fp)
temp = drm_fixp2int_ceil(temp2_fp);
else
temp = 0;
temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
temp2_fp = drm_fixp_div(temp1_fp, temp2_fp);
temp1_fp = drm_fixp_from_fraction(temp, 1);
temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
temp = drm_fixp2int(temp2_fp);
if (tu->async_en)
tu->delay_start_link += (int)temp;
temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
/* OUTPUTS */
tu_table->valid_boundary_link = tu->valid_boundary_link;
tu_table->delay_start_link = tu->delay_start_link;
tu_table->boundary_moderation_en = tu->boundary_moderation_en;
tu_table->valid_lower_boundary_link = tu->valid_lower_boundary_link;
tu_table->upper_boundary_count = tu->upper_boundary_count;
tu_table->lower_boundary_count = tu->lower_boundary_count;
tu_table->tu_size_minus1 = tu->tu_size_minus1;
drm_dbg_dp(ctrl->drm_dev, "TU: valid_boundary_link: %d\n",
tu_table->valid_boundary_link);
drm_dbg_dp(ctrl->drm_dev, "TU: delay_start_link: %d\n",
tu_table->delay_start_link);
drm_dbg_dp(ctrl->drm_dev, "TU: boundary_moderation_en: %d\n",
tu_table->boundary_moderation_en);
drm_dbg_dp(ctrl->drm_dev, "TU: valid_lower_boundary_link: %d\n",
tu_table->valid_lower_boundary_link);
drm_dbg_dp(ctrl->drm_dev, "TU: upper_boundary_count: %d\n",
tu_table->upper_boundary_count);
drm_dbg_dp(ctrl->drm_dev, "TU: lower_boundary_count: %d\n",
tu_table->lower_boundary_count);
drm_dbg_dp(ctrl->drm_dev, "TU: tu_size_minus1: %d\n",
tu_table->tu_size_minus1);
kfree(tu);
}
static void dp_ctrl_calc_tu_parameters(struct dp_ctrl_private *ctrl,
struct dp_vc_tu_mapping_table *tu_table)
{
struct dp_tu_calc_input in;
struct drm_display_mode *drm_mode;
drm_mode = &ctrl->panel->dp_mode.drm_mode;
in.lclk = ctrl->link->link_params.rate / 1000;
in.pclk_khz = drm_mode->clock;
in.hactive = drm_mode->hdisplay;
in.hporch = drm_mode->htotal - drm_mode->hdisplay;
in.nlanes = ctrl->link->link_params.num_lanes;
in.bpp = ctrl->panel->dp_mode.bpp;
in.pixel_enc = 444;
in.dsc_en = 0;
in.async_en = 0;
in.fec_en = 0;
in.num_of_dsc_slices = 0;
in.compress_ratio = 100;
_dp_ctrl_calc_tu(ctrl, &in, tu_table);
}
static void dp_ctrl_setup_tr_unit(struct dp_ctrl_private *ctrl)
{
u32 dp_tu = 0x0;
u32 valid_boundary = 0x0;
u32 valid_boundary2 = 0x0;
struct dp_vc_tu_mapping_table tu_calc_table;
dp_ctrl_calc_tu_parameters(ctrl, &tu_calc_table);
dp_tu |= tu_calc_table.tu_size_minus1;
valid_boundary |= tu_calc_table.valid_boundary_link;
valid_boundary |= (tu_calc_table.delay_start_link << 16);
valid_boundary2 |= (tu_calc_table.valid_lower_boundary_link << 1);
valid_boundary2 |= (tu_calc_table.upper_boundary_count << 16);
valid_boundary2 |= (tu_calc_table.lower_boundary_count << 20);
if (tu_calc_table.boundary_moderation_en)
valid_boundary2 |= BIT(0);
pr_debug("dp_tu=0x%x, valid_boundary=0x%x, valid_boundary2=0x%x\n",
dp_tu, valid_boundary, valid_boundary2);
dp_catalog_ctrl_update_transfer_unit(ctrl->catalog,
dp_tu, valid_boundary, valid_boundary2);
}
static int dp_ctrl_wait4video_ready(struct dp_ctrl_private *ctrl)
{
int ret = 0;
if (!wait_for_completion_timeout(&ctrl->video_comp,
WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES)) {
DRM_ERROR("wait4video timedout\n");
ret = -ETIMEDOUT;
}
return ret;
}
static int dp_ctrl_update_vx_px(struct dp_ctrl_private *ctrl)
{
struct dp_link *link = ctrl->link;
int ret = 0, lane, lane_cnt;
u8 buf[4];
u32 max_level_reached = 0;
u32 voltage_swing_level = link->phy_params.v_level;
u32 pre_emphasis_level = link->phy_params.p_level;
drm_dbg_dp(ctrl->drm_dev,
"voltage level: %d emphasis level: %d\n",
voltage_swing_level, pre_emphasis_level);
ret = dp_catalog_ctrl_update_vx_px(ctrl->catalog,
voltage_swing_level, pre_emphasis_level);
if (ret)
return ret;
if (voltage_swing_level >= DP_TRAIN_VOLTAGE_SWING_MAX) {
drm_dbg_dp(ctrl->drm_dev,
"max. voltage swing level reached %d\n",
voltage_swing_level);
max_level_reached |= DP_TRAIN_MAX_SWING_REACHED;
}
if (pre_emphasis_level >= DP_TRAIN_PRE_EMPHASIS_MAX) {
drm_dbg_dp(ctrl->drm_dev,
"max. pre-emphasis level reached %d\n",
pre_emphasis_level);
max_level_reached |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
}
pre_emphasis_level <<= DP_TRAIN_PRE_EMPHASIS_SHIFT;
lane_cnt = ctrl->link->link_params.num_lanes;
for (lane = 0; lane < lane_cnt; lane++)
buf[lane] = voltage_swing_level | pre_emphasis_level
| max_level_reached;
drm_dbg_dp(ctrl->drm_dev, "sink: p|v=0x%x\n",
voltage_swing_level | pre_emphasis_level);
ret = drm_dp_dpcd_write(ctrl->aux, DP_TRAINING_LANE0_SET,
buf, lane_cnt);
if (ret == lane_cnt)
ret = 0;
return ret;
}
static bool dp_ctrl_train_pattern_set(struct dp_ctrl_private *ctrl,
u8 pattern)
{
u8 buf;
int ret = 0;
drm_dbg_dp(ctrl->drm_dev, "sink: pattern=%x\n", pattern);
buf = pattern;
if (pattern && pattern != DP_TRAINING_PATTERN_4)
buf |= DP_LINK_SCRAMBLING_DISABLE;
ret = drm_dp_dpcd_writeb(ctrl->aux, DP_TRAINING_PATTERN_SET, buf);
return ret == 1;
}
static int dp_ctrl_read_link_status(struct dp_ctrl_private *ctrl,
u8 *link_status)
{
int ret = 0, len;
len = drm_dp_dpcd_read_link_status(ctrl->aux, link_status);
if (len != DP_LINK_STATUS_SIZE) {
DRM_ERROR("DP link status read failed, err: %d\n", len);
ret = -EINVAL;
}
return ret;
}
static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl,
int *training_step)
{
int tries, old_v_level, ret = 0;
u8 link_status[DP_LINK_STATUS_SIZE];
int const maximum_retries = 4;
dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
*training_step = DP_TRAINING_1;
ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, 1);
if (ret)
return ret;
dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE);
ret = dp_ctrl_update_vx_px(ctrl);
if (ret)
return ret;
tries = 0;
old_v_level = ctrl->link->phy_params.v_level;
for (tries = 0; tries < maximum_retries; tries++) {
drm_dp_link_train_clock_recovery_delay(ctrl->aux, ctrl->panel->dpcd);
ret = dp_ctrl_read_link_status(ctrl, link_status);
if (ret)
return ret;
if (drm_dp_clock_recovery_ok(link_status,
ctrl->link->link_params.num_lanes)) {
return 0;
}
if (ctrl->link->phy_params.v_level >=
DP_TRAIN_VOLTAGE_SWING_MAX) {
DRM_ERROR_RATELIMITED("max v_level reached\n");
return -EAGAIN;
}
if (old_v_level != ctrl->link->phy_params.v_level) {
tries = 0;
old_v_level = ctrl->link->phy_params.v_level;
}
dp_link_adjust_levels(ctrl->link, link_status);
ret = dp_ctrl_update_vx_px(ctrl);
if (ret)
return ret;
}
DRM_ERROR("max tries reached\n");
return -ETIMEDOUT;
}
static int dp_ctrl_link_rate_down_shift(struct dp_ctrl_private *ctrl)
{
int ret = 0;
switch (ctrl->link->link_params.rate) {
case 810000:
ctrl->link->link_params.rate = 540000;
break;
case 540000:
ctrl->link->link_params.rate = 270000;
break;
case 270000:
ctrl->link->link_params.rate = 162000;
break;
case 162000:
default:
ret = -EINVAL;
break;
}
if (!ret) {
drm_dbg_dp(ctrl->drm_dev, "new rate=0x%x\n",
ctrl->link->link_params.rate);
}
return ret;
}
static int dp_ctrl_link_lane_down_shift(struct dp_ctrl_private *ctrl)
{
if (ctrl->link->link_params.num_lanes == 1)
return -1;
ctrl->link->link_params.num_lanes /= 2;
ctrl->link->link_params.rate = ctrl->panel->link_info.rate;
ctrl->link->phy_params.p_level = 0;
ctrl->link->phy_params.v_level = 0;
return 0;
}
static void dp_ctrl_clear_training_pattern(struct dp_ctrl_private *ctrl)
{
dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_DISABLE);
drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);
}
static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
int *training_step)
{
int tries = 0, ret = 0;
u8 pattern;
u32 state_ctrl_bit;
int const maximum_retries = 5;
u8 link_status[DP_LINK_STATUS_SIZE];
dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
*training_step = DP_TRAINING_2;
if (drm_dp_tps4_supported(ctrl->panel->dpcd)) {
pattern = DP_TRAINING_PATTERN_4;
state_ctrl_bit = 4;
} else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) {
pattern = DP_TRAINING_PATTERN_3;
state_ctrl_bit = 3;
} else {
pattern = DP_TRAINING_PATTERN_2;
state_ctrl_bit = 2;
}
ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit);
if (ret)
return ret;
dp_ctrl_train_pattern_set(ctrl, pattern);
for (tries = 0; tries <= maximum_retries; tries++) {
drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);
ret = dp_ctrl_read_link_status(ctrl, link_status);
if (ret)
return ret;
if (drm_dp_channel_eq_ok(link_status,
ctrl->link->link_params.num_lanes)) {
return 0;
}
dp_link_adjust_levels(ctrl->link, link_status);
ret = dp_ctrl_update_vx_px(ctrl);
if (ret)
return ret;
}
return -ETIMEDOUT;
}
static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
int *training_step)
{
int ret = 0;
const u8 *dpcd = ctrl->panel->dpcd;
u8 encoding[] = { 0, DP_SET_ANSI_8B10B };
u8 assr;
struct dp_link_info link_info = {0};
dp_ctrl_config_ctrl(ctrl);
link_info.num_lanes = ctrl->link->link_params.num_lanes;
link_info.rate = ctrl->link->link_params.rate;
link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;
dp_aux_link_configure(ctrl->aux, &link_info);
if (drm_dp_max_downspread(dpcd))
encoding[0] |= DP_SPREAD_AMP_0_5;
/* config DOWNSPREAD_CTRL and MAIN_LINK_CHANNEL_CODING_SET */
drm_dp_dpcd_write(ctrl->aux, DP_DOWNSPREAD_CTRL, encoding, 2);
if (drm_dp_alternate_scrambler_reset_cap(dpcd)) {
assr = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
drm_dp_dpcd_write(ctrl->aux, DP_EDP_CONFIGURATION_SET,
&assr, 1);
}
ret = dp_ctrl_link_train_1(ctrl, training_step);
if (ret) {
DRM_ERROR("link training #1 failed. ret=%d\n", ret);
goto end;
}
/* print success info as this is a result of user initiated action */
drm_dbg_dp(ctrl->drm_dev, "link training #1 successful\n");
ret = dp_ctrl_link_train_2(ctrl, training_step);
if (ret) {
DRM_ERROR("link training #2 failed. ret=%d\n", ret);
goto end;
}
/* print success info as this is a result of user initiated action */
drm_dbg_dp(ctrl->drm_dev, "link training #2 successful\n");
end:
dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
return ret;
}
static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl,
int *training_step)
{
int ret = 0;
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
return ret;
/*
* As part of previous calls, DP controller state might have
* transitioned to PUSH_IDLE. In order to start transmitting
* a link training pattern, we have to first do soft reset.
*/
ret = dp_ctrl_link_train(ctrl, training_step);
return ret;
}
static void dp_ctrl_set_clock_rate(struct dp_ctrl_private *ctrl,
enum dp_pm_type module, char *name, unsigned long rate)
{
u32 num = ctrl->parser->mp[module].num_clk;
struct clk_bulk_data *cfg = ctrl->parser->mp[module].clocks;
while (num && strcmp(cfg->id, name)) {
num--;
cfg++;
}
drm_dbg_dp(ctrl->drm_dev, "setting rate=%lu on clk=%s\n",
rate, name);
if (num)
clk_set_rate(cfg->clk, rate);
else
DRM_ERROR("%s clock doesn't exit to set rate %lu\n",
name, rate);
}
static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
{
int ret = 0;
struct dp_io *dp_io = &ctrl->parser->io;
struct phy *phy = dp_io->phy;
struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;
const u8 *dpcd = ctrl->panel->dpcd;
opts_dp->lanes = ctrl->link->link_params.num_lanes;
opts_dp->link_rate = ctrl->link->link_params.rate / 100;
opts_dp->ssc = drm_dp_max_downspread(dpcd);
phy_configure(phy, &dp_io->phy_opts);
phy_power_on(phy);
dev_pm_opp_set_rate(ctrl->dev, ctrl->link->link_params.rate * 1000);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true);
if (ret)
DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);
drm_dbg_dp(ctrl->drm_dev, "link rate=%d\n", ctrl->link->link_params.rate);
return ret;
}
void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
{
struct dp_ctrl_private *ctrl;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_catalog_ctrl_reset(ctrl->catalog);
/*
* all dp controller programmable registers will not
* be reset to default value after DP_SW_RESET
* therefore interrupt mask bits have to be updated
* to enable/disable interrupts
*/
dp_catalog_ctrl_enable_irq(ctrl->catalog, enable);
}
void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
dp_catalog_ctrl_phy_reset(ctrl->catalog);
phy_init(phy);
drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
}
void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
dp_catalog_ctrl_phy_reset(ctrl->catalog);
phy_exit(phy);
drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
}
static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
{
const u8 *dpcd = ctrl->panel->dpcd;
/*
* For better interop experience, used a fixed NVID=0x8000
* whenever connected to a VGA dongle downstream.
*/
if (drm_dp_is_branch(dpcd))
return (drm_dp_has_quirk(&ctrl->panel->desc,
DP_DPCD_QUIRK_CONSTANT_N));
return false;
}
static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
{
int ret = 0;
struct dp_io *dp_io = &ctrl->parser->io;
struct phy *phy = dp_io->phy;
struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
opts_dp->lanes = ctrl->link->link_params.num_lanes;
phy_configure(phy, &dp_io->phy_opts);
/*
* Disable and re-enable the mainlink clock since the
* link clock might have been adjusted as part of the
* link maintenance.
*/
dev_pm_opp_set_rate(ctrl->dev, 0);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
if (ret) {
DRM_ERROR("Failed to disable clocks. ret=%d\n", ret);
return ret;
}
phy_power_off(phy);
/* hw recommended delay before re-enabling clocks */
msleep(20);
ret = dp_ctrl_enable_mainlink_clocks(ctrl);
if (ret) {
DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret);
return ret;
}
return ret;
}
static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
{
struct dp_io *dp_io;
struct phy *phy;
int ret;
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
dp_catalog_ctrl_reset(ctrl->catalog);
dev_pm_opp_set_rate(ctrl->dev, 0);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
if (ret) {
DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
}
phy_power_off(phy);
/* aux channel down, reinit phy */
phy_exit(phy);
phy_init(phy);
drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
return 0;
}
static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl)
{
int ret = 0;
int training_step = DP_TRAINING_NONE;
dp_ctrl_push_idle(&ctrl->dp_ctrl);
ctrl->link->phy_params.p_level = 0;
ctrl->link->phy_params.v_level = 0;
ret = dp_ctrl_setup_main_link(ctrl, &training_step);
if (ret)
goto end;
dp_ctrl_clear_training_pattern(ctrl);
dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
ret = dp_ctrl_wait4video_ready(ctrl);
end:
return ret;
}
static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
{
bool success = false;
u32 pattern_sent = 0x0;
u32 pattern_requested = ctrl->link->phy_params.phy_test_pattern_sel;
drm_dbg_dp(ctrl->drm_dev, "request: 0x%x\n", pattern_requested);
if (dp_catalog_ctrl_update_vx_px(ctrl->catalog,
ctrl->link->phy_params.v_level,
ctrl->link->phy_params.p_level)) {
DRM_ERROR("Failed to set v/p levels\n");
return false;
}
dp_catalog_ctrl_send_phy_pattern(ctrl->catalog, pattern_requested);
dp_ctrl_update_vx_px(ctrl);
dp_link_send_test_response(ctrl->link);
pattern_sent = dp_catalog_ctrl_read_phy_pattern(ctrl->catalog);
switch (pattern_sent) {
case MR_LINK_TRAINING1:
success = (pattern_requested ==
DP_PHY_TEST_PATTERN_D10_2);
break;
case MR_LINK_SYMBOL_ERM:
success = ((pattern_requested ==
DP_PHY_TEST_PATTERN_ERROR_COUNT) ||
(pattern_requested ==
DP_PHY_TEST_PATTERN_CP2520));
break;
case MR_LINK_PRBS7:
success = (pattern_requested ==
DP_PHY_TEST_PATTERN_PRBS7);
break;
case MR_LINK_CUSTOM80:
success = (pattern_requested ==
DP_PHY_TEST_PATTERN_80BIT_CUSTOM);
break;
case MR_LINK_TRAINING4:
success = (pattern_requested ==
DP_PHY_TEST_PATTERN_SEL_MASK);
break;
default:
success = false;
}
drm_dbg_dp(ctrl->drm_dev, "%s: test->0x%x\n",
success ? "success" : "failed", pattern_requested);
return success;
}
static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
{
int ret;
unsigned long pixel_rate;
if (!ctrl->link->phy_params.phy_test_pattern_sel) {
drm_dbg_dp(ctrl->drm_dev,
"no test pattern selected by sink\n");
return 0;
}
/*
* The global reset will need DP link related clocks to be
* running. Add the global reset just before disabling the
* link clocks and core clocks.
*/
ret = dp_ctrl_off(&ctrl->dp_ctrl);
if (ret) {
DRM_ERROR("failed to disable DP controller\n");
return ret;
}
ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
if (ret) {
DRM_ERROR("failed to enable DP link controller\n");
return ret;
}
pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel", pixel_rate * 1000);
ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true);
if (ret) {
DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
return ret;
}
dp_ctrl_send_phy_test_pattern(ctrl);
return 0;
}
void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
u32 sink_request = 0x0;
if (!dp_ctrl) {
DRM_ERROR("invalid input\n");
return;
}
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
sink_request = ctrl->link->sink_request;
if (sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
drm_dbg_dp(ctrl->drm_dev, "PHY_TEST_PATTERN request\n");
if (dp_ctrl_process_phy_test_request(ctrl)) {
DRM_ERROR("process phy_test_req failed\n");
return;
}
}
if (sink_request & DP_LINK_STATUS_UPDATED) {
if (dp_ctrl_link_maintenance(ctrl)) {
DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
return;
}
}
if (sink_request & DP_TEST_LINK_TRAINING) {
dp_link_send_test_response(ctrl->link);
if (dp_ctrl_link_maintenance(ctrl)) {
DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
return;
}
}
}
static bool dp_ctrl_clock_recovery_any_ok(
const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count)
{
int reduced_cnt;
if (lane_count <= 1)
return false;
/*
* only interested in the lane number after reduced
* lane_count = 4, then only interested in 2 lanes
* lane_count = 2, then only interested in 1 lane
*/
reduced_cnt = lane_count >> 1;
return drm_dp_clock_recovery_ok(link_status, reduced_cnt);
}
static bool dp_ctrl_channel_eq_ok(struct dp_ctrl_private *ctrl)
{
u8 link_status[DP_LINK_STATUS_SIZE];
int num_lanes = ctrl->link->link_params.num_lanes;
dp_ctrl_read_link_status(ctrl, link_status);
return drm_dp_channel_eq_ok(link_status, num_lanes);
}
int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
{
int rc = 0;
struct dp_ctrl_private *ctrl;
u32 rate;
int link_train_max_retries = 5;
u32 const phy_cts_pixel_clk_khz = 148500;
u8 link_status[DP_LINK_STATUS_SIZE];
unsigned int training_step;
unsigned long pixel_rate;
if (!dp_ctrl)
return -EINVAL;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
rate = ctrl->panel->link_info.rate;
pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
dp_power_clk_enable(ctrl->power, DP_CORE_PM, true);
if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
drm_dbg_dp(ctrl->drm_dev,
"using phy test link parameters\n");
if (!pixel_rate)
pixel_rate = phy_cts_pixel_clk_khz;
} else {
ctrl->link->link_params.rate = rate;
ctrl->link->link_params.num_lanes =
ctrl->panel->link_info.num_lanes;
}
drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes,
pixel_rate);
rc = dp_ctrl_enable_mainlink_clocks(ctrl);
if (rc)
return rc;
while (--link_train_max_retries) {
rc = dp_ctrl_reinitialize_mainlink(ctrl);
if (rc) {
DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n",
rc);
break;
}
training_step = DP_TRAINING_NONE;
rc = dp_ctrl_setup_main_link(ctrl, &training_step);
if (rc == 0) {
/* training completed successfully */
break;
} else if (training_step == DP_TRAINING_1) {
/* link train_1 failed */
if (!dp_catalog_link_is_connected(ctrl->catalog))
break;
dp_ctrl_read_link_status(ctrl, link_status);
rc = dp_ctrl_link_rate_down_shift(ctrl);
if (rc < 0) { /* already in RBR = 1.6G */
if (dp_ctrl_clock_recovery_any_ok(link_status,
ctrl->link->link_params.num_lanes)) {
/*
* some lanes are ready,
* reduce lane number
*/
rc = dp_ctrl_link_lane_down_shift(ctrl);
if (rc < 0) { /* lane == 1 already */
/* end with failure */
break;
}
} else {
/* end with failure */
break; /* lane == 1 already */
}
}
} else if (training_step == DP_TRAINING_2) {
/* link train_2 failed */
if (!dp_catalog_link_is_connected(ctrl->catalog))
break;
dp_ctrl_read_link_status(ctrl, link_status);
if (!drm_dp_clock_recovery_ok(link_status,
ctrl->link->link_params.num_lanes))
rc = dp_ctrl_link_rate_down_shift(ctrl);
else
rc = dp_ctrl_link_lane_down_shift(ctrl);
if (rc < 0) {
/* end with failure */
break; /* lane == 1 already */
}
/* stop link training before start re training */
dp_ctrl_clear_training_pattern(ctrl);
}
}
if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
return rc;
if (rc == 0) { /* link train successfully */
/*
* do not stop train pattern here
* stop link training at on_stream
* to pass compliance test
*/
} else {
/*
* link training failed
* end txing train pattern here
*/
dp_ctrl_clear_training_pattern(ctrl);
dp_ctrl_deinitialize_mainlink(ctrl);
rc = -ECONNRESET;
}
return rc;
}
static int dp_ctrl_link_retrain(struct dp_ctrl_private *ctrl)
{
int training_step = DP_TRAINING_NONE;
return dp_ctrl_setup_main_link(ctrl, &training_step);
}
int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool force_link_train)
{
int ret = 0;
bool mainlink_ready = false;
struct dp_ctrl_private *ctrl;
unsigned long pixel_rate;
unsigned long pixel_rate_orig;
if (!dp_ctrl)
return -EINVAL;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
pixel_rate = pixel_rate_orig = ctrl->panel->dp_mode.drm_mode.clock;
if (dp_ctrl->wide_bus_en)
pixel_rate >>= 1;
drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
ctrl->link->link_params.rate,
ctrl->link->link_params.num_lanes, pixel_rate);
if (!dp_power_clk_status(ctrl->power, DP_CTRL_PM)) { /* link clk is off */
ret = dp_ctrl_enable_mainlink_clocks(ctrl);
if (ret) {
DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
goto end;
}
}
dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel", pixel_rate * 1000);
ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true);
if (ret) {
DRM_ERROR("Unable to start pixel clocks. ret=%d\n", ret);
goto end;
}
if (force_link_train || !dp_ctrl_channel_eq_ok(ctrl))
dp_ctrl_link_retrain(ctrl);
/* stop txing train pattern to end link training */
dp_ctrl_clear_training_pattern(ctrl);
/*
* Set up transfer unit values and set controller state to send
* video.
*/
reinit_completion(&ctrl->video_comp);
dp_ctrl_configure_source_params(ctrl);
dp_catalog_ctrl_config_msa(ctrl->catalog,
ctrl->link->link_params.rate,
pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl));
dp_ctrl_setup_tr_unit(ctrl);
dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
ret = dp_ctrl_wait4video_ready(ctrl);
if (ret)
return ret;
mainlink_ready = dp_catalog_ctrl_mainlink_ready(ctrl->catalog);
drm_dbg_dp(ctrl->drm_dev,
"mainlink %s\n", mainlink_ready ? "READY" : "NOT READY");
end:
return ret;
}
int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
int ret;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
/* set dongle to D3 (power off) mode */
dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
if (dp_power_clk_status(ctrl->power, DP_STREAM_PM)) {
ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
if (ret) {
DRM_ERROR("Failed to disable pclk. ret=%d\n", ret);
return ret;
}
}
dev_pm_opp_set_rate(ctrl->dev, 0);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
if (ret) {
DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
return ret;
}
phy_power_off(phy);
/* aux channel down, reinit phy */
phy_exit(phy);
phy_init(phy);
drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
return ret;
}
int dp_ctrl_off_link(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
int ret;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
if (ret) {
DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
}
DRM_DEBUG_DP("Before, phy=%p init_count=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
phy_power_off(phy);
DRM_DEBUG_DP("After, phy=%p init_count=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
return ret;
}
int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
struct dp_io *dp_io;
struct phy *phy;
int ret = 0;
if (!dp_ctrl)
return -EINVAL;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
dp_io = &ctrl->parser->io;
phy = dp_io->phy;
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
dp_catalog_ctrl_reset(ctrl->catalog);
ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
if (ret)
DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret);
dev_pm_opp_set_rate(ctrl->dev, 0);
ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
if (ret) {
DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
}
phy_power_off(phy);
drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
phy, phy->init_count, phy->power_count);
return ret;
}
void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
u32 isr;
if (!dp_ctrl)
return;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
drm_dbg_dp(ctrl->drm_dev, "dp_video_ready\n");
complete(&ctrl->video_comp);
}
if (isr & DP_CTRL_INTR_IDLE_PATTERN_SENT) {
drm_dbg_dp(ctrl->drm_dev, "idle_patterns_sent\n");
complete(&ctrl->idle_comp);
}
}
struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
struct dp_panel *panel, struct drm_dp_aux *aux,
struct dp_power *power, struct dp_catalog *catalog,
struct dp_parser *parser)
{
struct dp_ctrl_private *ctrl;
int ret;
if (!dev || !panel || !aux ||
!link || !catalog) {
DRM_ERROR("invalid input\n");
return ERR_PTR(-EINVAL);
}
ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl) {
DRM_ERROR("Mem allocation failure\n");
return ERR_PTR(-ENOMEM);
}
ret = devm_pm_opp_set_clkname(dev, "ctrl_link");
if (ret) {
dev_err(dev, "invalid DP OPP table in device tree\n");
/* caller do PTR_ERR(opp_table) */
return (struct dp_ctrl *)ERR_PTR(ret);
}
/* OPP table is optional */
ret = devm_pm_opp_of_add_table(dev);
if (ret)
dev_err(dev, "failed to add DP OPP table\n");
init_completion(&ctrl->idle_comp);
init_completion(&ctrl->video_comp);
/* in parameters */
ctrl->parser = parser;
ctrl->panel = panel;
ctrl->power = power;
ctrl->aux = aux;
ctrl->link = link;
ctrl->catalog = catalog;
ctrl->dev = dev;
return &ctrl->dp_ctrl;
}
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