root/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c

DEFINITIONS

1. dsi_14nm_dphy_set_timing
2. dsi_14nm_phy_enable
3. dsi_14nm_phy_disable
4. dsi_14nm_phy_init

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2016, The Linux Foundation. All rights reserved.
   4  */
   5 
   6 #include <linux/delay.h>
   7 
   8 #include "dsi_phy.h"
   9 #include "dsi.xml.h"
  10 
  11 #define PHY_14NM_CKLN_IDX       4
  12 
  13 static void dsi_14nm_dphy_set_timing(struct msm_dsi_phy *phy,
  14                                      struct msm_dsi_dphy_timing *timing,
  15                                      int lane_idx)
  16 {
  17         void __iomem *base = phy->lane_base;
  18         bool clk_ln = (lane_idx == PHY_14NM_CKLN_IDX);
  19         u32 zero = clk_ln ? timing->clk_zero : timing->hs_zero;
  20         u32 prepare = clk_ln ? timing->clk_prepare : timing->hs_prepare;
  21         u32 trail = clk_ln ? timing->clk_trail : timing->hs_trail;
  22         u32 rqst = clk_ln ? timing->hs_rqst_ckln : timing->hs_rqst;
  23         u32 prep_dly = clk_ln ? timing->hs_prep_dly_ckln : timing->hs_prep_dly;
  24         u32 halfbyte_en = clk_ln ? timing->hs_halfbyte_en_ckln :
  25                                    timing->hs_halfbyte_en;
  26 
  27         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_4(lane_idx),
  28                       DSI_14nm_PHY_LN_TIMING_CTRL_4_HS_EXIT(timing->hs_exit));
  29         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_5(lane_idx),
  30                       DSI_14nm_PHY_LN_TIMING_CTRL_5_HS_ZERO(zero));
  31         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_6(lane_idx),
  32                       DSI_14nm_PHY_LN_TIMING_CTRL_6_HS_PREPARE(prepare));
  33         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_7(lane_idx),
  34                       DSI_14nm_PHY_LN_TIMING_CTRL_7_HS_TRAIL(trail));
  35         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_8(lane_idx),
  36                       DSI_14nm_PHY_LN_TIMING_CTRL_8_HS_RQST(rqst));
  37         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_CFG0(lane_idx),
  38                       DSI_14nm_PHY_LN_CFG0_PREPARE_DLY(prep_dly));
  39         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_CFG1(lane_idx),
  40                       halfbyte_en ? DSI_14nm_PHY_LN_CFG1_HALFBYTECLK_EN : 0);
  41         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_9(lane_idx),
  42                       DSI_14nm_PHY_LN_TIMING_CTRL_9_TA_GO(timing->ta_go) |
  43                       DSI_14nm_PHY_LN_TIMING_CTRL_9_TA_SURE(timing->ta_sure));
  44         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_10(lane_idx),
  45                       DSI_14nm_PHY_LN_TIMING_CTRL_10_TA_GET(timing->ta_get));
  46         dsi_phy_write(base + REG_DSI_14nm_PHY_LN_TIMING_CTRL_11(lane_idx),
  47                       DSI_14nm_PHY_LN_TIMING_CTRL_11_TRIG3_CMD(0xa0));
  48 }
  49 
  50 static int dsi_14nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
  51                                struct msm_dsi_phy_clk_request *clk_req)
  52 {
  53         struct msm_dsi_dphy_timing *timing = &phy->timing;
  54         u32 data;
  55         int i;
  56         int ret;
  57         void __iomem *base = phy->base;
  58         void __iomem *lane_base = phy->lane_base;
  59 
  60         if (msm_dsi_dphy_timing_calc_v2(timing, clk_req)) {
  61                 DRM_DEV_ERROR(&phy->pdev->dev,
  62                         "%s: D-PHY timing calculation failed\n", __func__);
  63                 return -EINVAL;
  64         }
  65 
  66         data = 0x1c;
  67         if (phy->usecase != MSM_DSI_PHY_STANDALONE)
  68                 data |= DSI_14nm_PHY_CMN_LDO_CNTRL_VREG_CTRL(32);
  69         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_LDO_CNTRL, data);
  70 
  71         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_GLBL_TEST_CTRL, 0x1);
  72 
  73         /* 4 data lanes + 1 clk lane configuration */
  74         for (i = 0; i < 5; i++) {
  75                 dsi_phy_write(lane_base + REG_DSI_14nm_PHY_LN_VREG_CNTRL(i),
  76                               0x1d);
  77 
  78                 dsi_phy_write(lane_base +
  79                               REG_DSI_14nm_PHY_LN_STRENGTH_CTRL_0(i), 0xff);
  80                 dsi_phy_write(lane_base +
  81                               REG_DSI_14nm_PHY_LN_STRENGTH_CTRL_1(i),
  82                               (i == PHY_14NM_CKLN_IDX) ? 0x00 : 0x06);
  83 
  84                 dsi_phy_write(lane_base + REG_DSI_14nm_PHY_LN_CFG3(i),
  85                               (i == PHY_14NM_CKLN_IDX) ? 0x8f : 0x0f);
  86                 dsi_phy_write(lane_base + REG_DSI_14nm_PHY_LN_CFG2(i), 0x10);
  87                 dsi_phy_write(lane_base + REG_DSI_14nm_PHY_LN_TEST_DATAPATH(i),
  88                               0);
  89                 dsi_phy_write(lane_base + REG_DSI_14nm_PHY_LN_TEST_STR(i),
  90                               0x88);
  91 
  92                 dsi_14nm_dphy_set_timing(phy, timing, i);
  93         }
  94 
  95         /* Make sure PLL is not start */
  96         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_PLL_CNTRL, 0x00);
  97 
  98         wmb(); /* make sure everything is written before reset and enable */
  99 
 100         /* reset digital block */
 101         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_CTRL_1, 0x80);
 102         wmb(); /* ensure reset is asserted */
 103         udelay(100);
 104         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_CTRL_1, 0x00);
 105 
 106         msm_dsi_phy_set_src_pll(phy, src_pll_id,
 107                                 REG_DSI_14nm_PHY_CMN_GLBL_TEST_CTRL,
 108                                 DSI_14nm_PHY_CMN_GLBL_TEST_CTRL_BITCLK_HS_SEL);
 109 
 110         ret = msm_dsi_pll_set_usecase(phy->pll, phy->usecase);
 111         if (ret) {
 112                 DRM_DEV_ERROR(&phy->pdev->dev, "%s: set pll usecase failed, %d\n",
 113                         __func__, ret);
 114                 return ret;
 115         }
 116 
 117         /* Remove power down from PLL and all lanes */
 118         dsi_phy_write(base + REG_DSI_14nm_PHY_CMN_CTRL_0, 0xff);
 119 
 120         return 0;
 121 }
 122 
 123 static void dsi_14nm_phy_disable(struct msm_dsi_phy *phy)
 124 {
 125         dsi_phy_write(phy->base + REG_DSI_14nm_PHY_CMN_GLBL_TEST_CTRL, 0);
 126         dsi_phy_write(phy->base + REG_DSI_14nm_PHY_CMN_CTRL_0, 0);
 127 
 128         /* ensure that the phy is completely disabled */
 129         wmb();
 130 }
 131 
 132 static int dsi_14nm_phy_init(struct msm_dsi_phy *phy)
 133 {
 134         struct platform_device *pdev = phy->pdev;
 135 
 136         phy->lane_base = msm_ioremap(pdev, "dsi_phy_lane",
 137                                 "DSI_PHY_LANE");
 138         if (IS_ERR(phy->lane_base)) {
 139                 DRM_DEV_ERROR(&pdev->dev, "%s: failed to map phy lane base\n",
 140                         __func__);
 141                 return -ENOMEM;
 142         }
 143 
 144         return 0;
 145 }
 146 
 147 const struct msm_dsi_phy_cfg dsi_phy_14nm_cfgs = {
 148         .type = MSM_DSI_PHY_14NM,
 149         .src_pll_truthtable = { {false, false}, {true, false} },
 150         .reg_cfg = {
 151                 .num = 1,
 152                 .regs = {
 153                         {"vcca", 17000, 32},
 154                 },
 155         },
 156         .ops = {
 157                 .enable = dsi_14nm_phy_enable,
 158                 .disable = dsi_14nm_phy_disable,
 159                 .init = dsi_14nm_phy_init,
 160         },
 161         .io_start = { 0x994400, 0x996400 },
 162         .num_dsi_phy = 2,
 163 };