drivers/gpu/drm/amd/display/dc/clk_mgr/dce120/dce120_clk_mgr.c

   1 /*
   2  * Copyright 2012-16 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25
  26 #include "core_types.h"
  27 #include "clk_mgr_internal.h"
  28
  29 #include "dce112/dce112_clk_mgr.h"
  30 #include "dce110/dce110_clk_mgr.h"
  31 #include "dce120_clk_mgr.h"
  32 #include "dce100/dce_clk_mgr.h"
  33 #include "dce120/dce120_hw_sequencer.h"
  34
  35 static const struct state_dependent_clocks dce120_max_clks_by_state[] = {
  36 /*ClocksStateInvalid - should not be used*/
  37 { .display_clk_khz = 0, .pixel_clk_khz = 0 },
  38 /*ClocksStateUltraLow - currently by HW design team not supposed to be used*/
  39 { .display_clk_khz = 0, .pixel_clk_khz = 0 },
  40 /*ClocksStateLow*/
  41 { .display_clk_khz = 460000, .pixel_clk_khz = 400000 },
  42 /*ClocksStateNominal*/
  43 { .display_clk_khz = 670000, .pixel_clk_khz = 600000 },
  44 /*ClocksStatePerformance*/
  45 { .display_clk_khz = 1133000, .pixel_clk_khz = 600000 } };
  46
  47 /**
  48  * dce121_clock_patch_xgmi_ss_info() - Save XGMI spread spectrum info
  49  * @clk_mgr_dce: clock manager internal structure
  50  *
  51  * Reads from VBIOS the XGMI spread spectrum info and saves it within
  52  * the dce clock manager. This operation will overwrite the existing dprefclk
  53  * SS values if the vBIOS query succeeds. Otherwise, it does nothing. It also
  54  * sets the ->xgmi_enabled flag.
  55  */
  56 static void dce121_clock_patch_xgmi_ss_info(struct clk_mgr_internal *clk_mgr_dce)
  57 {
  58         enum bp_result result;
  59         struct spread_spectrum_info info = { { 0 } };
  60         struct dc_bios *bp = clk_mgr_dce->base.ctx->dc_bios;
  61
  62         clk_mgr_dce->xgmi_enabled = false;
  63
  64         result = bp->funcs->get_spread_spectrum_info(bp, AS_SIGNAL_TYPE_XGMI,
  65                                                      0, &info);
  66         if (result == BP_RESULT_OK && info.spread_spectrum_percentage != 0) {
  67                 clk_mgr_dce->xgmi_enabled = true;
  68                 clk_mgr_dce->ss_on_dprefclk = true;
  69                 clk_mgr_dce->dprefclk_ss_divider =
  70                                 info.spread_percentage_divider;
  71
  72                 if (info.type.CENTER_MODE == 0) {
  73                         /*
  74                          * Currently for DP Reference clock we
  75                          * need only SS percentage for
  76                          * downspread
  77                          */
  78                         clk_mgr_dce->dprefclk_ss_percentage =
  79                                         info.spread_spectrum_percentage;
  80                 }
  81         }
  82 }
  83
  84 static void dce12_update_clocks(struct clk_mgr *clk_mgr_base,
  85                         struct dc_state *context,
  86                         bool safe_to_lower)
  87 {
  88         struct clk_mgr_internal *clk_mgr_dce = TO_CLK_MGR_INTERNAL(clk_mgr_base);
  89         struct dm_pp_clock_for_voltage_req clock_voltage_req = {0};
  90         int max_pix_clk = dce_get_max_pixel_clock_for_all_paths(context);
  91         int patched_disp_clk = context->bw_ctx.bw.dce.dispclk_khz;
  92
  93         /*TODO: W/A for dal3 linux, investigate why this works */
  94         if (!clk_mgr_dce->dfs_bypass_active)
  95                 patched_disp_clk = patched_disp_clk * 115 / 100;
  96
  97         if (should_set_clock(safe_to_lower, patched_disp_clk, clk_mgr_base->clks.dispclk_khz)) {
  98                 clock_voltage_req.clk_type = DM_PP_CLOCK_TYPE_DISPLAY_CLK;
  99                 /*
 100                  * When xGMI is enabled, the display clk needs to be adjusted
 101                  * with the WAFL link's SS percentage.
 102                  */
 103                 if (clk_mgr_dce->xgmi_enabled)
 104                         patched_disp_clk = dce_adjust_dp_ref_freq_for_ss(
 105                                         clk_mgr_dce, patched_disp_clk);
 106                 clock_voltage_req.clocks_in_khz = patched_disp_clk;
 107                 clk_mgr_base->clks.dispclk_khz = dce112_set_clock(clk_mgr_base, patched_disp_clk);
 108
 109                 dm_pp_apply_clock_for_voltage_request(clk_mgr_base->ctx, &clock_voltage_req);
 110         }
 111
 112         if (should_set_clock(safe_to_lower, max_pix_clk, clk_mgr_base->clks.phyclk_khz)) {
 113                 clock_voltage_req.clk_type = DM_PP_CLOCK_TYPE_DISPLAYPHYCLK;
 114                 clock_voltage_req.clocks_in_khz = max_pix_clk;
 115                 clk_mgr_base->clks.phyclk_khz = max_pix_clk;
 116
 117                 dm_pp_apply_clock_for_voltage_request(clk_mgr_base->ctx, &clock_voltage_req);
 118         }
 119         dce11_pplib_apply_display_requirements(clk_mgr_base->ctx->dc, context);
 120 }
 121
 122
 123 static struct clk_mgr_funcs dce120_funcs = {
 124         .get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz,
 125         .update_clocks = dce12_update_clocks
 126 };
 127
 128 void dce120_clk_mgr_construct(struct dc_context *ctx, struct clk_mgr_internal *clk_mgr)
 129 {
 130         memcpy(clk_mgr->max_clks_by_state,
 131                 dce120_max_clks_by_state,
 132                 sizeof(dce120_max_clks_by_state));
 133
 134         dce_clk_mgr_construct(ctx, clk_mgr);
 135
 136         clk_mgr->base.dprefclk_khz = 600000;
 137         clk_mgr->base.funcs = &dce120_funcs;
 138 }
 139
 140 void dce121_clk_mgr_construct(struct dc_context *ctx, struct clk_mgr_internal *clk_mgr)
 141 {
 142         dce120_clk_mgr_construct(ctx, clk_mgr);
 143         clk_mgr->base.dprefclk_khz = 625000;
 144
 145         /*
 146          * The xGMI enabled info is used to determine if audio and display
 147          * clocks need to be adjusted with the WAFL link's SS info.
 148          */
 149         if (dce121_xgmi_enabled(ctx->dc->hwseq))
 150                 dce121_clock_patch_xgmi_ss_info(clk_mgr);
 151
 152 }
 153