Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include "dsi_pll.h" |
| 15 | |
| 16 | static int dsi_pll_enable(struct msm_dsi_pll *pll) |
| 17 | { |
| 18 | int i, ret = 0; |
| 19 | |
| 20 | /* |
| 21 | * Certain PLLs do not allow VCO rate update when it is on. |
| 22 | * Keep track of their status to turn on/off after set rate success. |
| 23 | */ |
| 24 | if (unlikely(pll->pll_on)) |
| 25 | return 0; |
| 26 | |
| 27 | /* Try all enable sequences until one succeeds */ |
| 28 | for (i = 0; i < pll->en_seq_cnt; i++) { |
| 29 | ret = pll->enable_seqs[i](pll); |
| 30 | DBG("DSI PLL %s after sequence #%d", |
| 31 | ret ? "unlocked" : "locked", i + 1); |
| 32 | if (!ret) |
| 33 | break; |
| 34 | } |
| 35 | |
| 36 | if (ret) { |
| 37 | DRM_ERROR("DSI PLL failed to lock\n"); |
| 38 | return ret; |
| 39 | } |
| 40 | |
| 41 | pll->pll_on = true; |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static void dsi_pll_disable(struct msm_dsi_pll *pll) |
| 47 | { |
| 48 | if (unlikely(!pll->pll_on)) |
| 49 | return; |
| 50 | |
| 51 | pll->disable_seq(pll); |
| 52 | |
| 53 | pll->pll_on = false; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * DSI PLL Helper functions |
| 58 | */ |
| 59 | long msm_dsi_pll_helper_clk_round_rate(struct clk_hw *hw, |
| 60 | unsigned long rate, unsigned long *parent_rate) |
| 61 | { |
| 62 | struct msm_dsi_pll *pll = hw_clk_to_pll(hw); |
| 63 | |
| 64 | if (rate < pll->min_rate) |
| 65 | return pll->min_rate; |
| 66 | else if (rate > pll->max_rate) |
| 67 | return pll->max_rate; |
| 68 | else |
| 69 | return rate; |
| 70 | } |
| 71 | |
| 72 | int msm_dsi_pll_helper_clk_prepare(struct clk_hw *hw) |
| 73 | { |
| 74 | struct msm_dsi_pll *pll = hw_clk_to_pll(hw); |
Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 75 | |
Hai Li | 328e1a6 | 2015-07-03 10:09:46 -0400 | [diff] [blame] | 76 | return dsi_pll_enable(pll); |
Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | void msm_dsi_pll_helper_clk_unprepare(struct clk_hw *hw) |
| 80 | { |
| 81 | struct msm_dsi_pll *pll = hw_clk_to_pll(hw); |
| 82 | |
Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 83 | dsi_pll_disable(pll); |
| 84 | } |
| 85 | |
| 86 | void msm_dsi_pll_helper_unregister_clks(struct platform_device *pdev, |
| 87 | struct clk **clks, u32 num_clks) |
| 88 | { |
| 89 | of_clk_del_provider(pdev->dev.of_node); |
| 90 | |
| 91 | if (!num_clks || !clks) |
| 92 | return; |
| 93 | |
| 94 | do { |
| 95 | clk_unregister(clks[--num_clks]); |
| 96 | clks[num_clks] = NULL; |
| 97 | } while (num_clks); |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * DSI PLL API |
| 102 | */ |
| 103 | int msm_dsi_pll_get_clk_provider(struct msm_dsi_pll *pll, |
| 104 | struct clk **byte_clk_provider, struct clk **pixel_clk_provider) |
| 105 | { |
| 106 | if (pll->get_provider) |
| 107 | return pll->get_provider(pll, |
| 108 | byte_clk_provider, |
| 109 | pixel_clk_provider); |
| 110 | |
| 111 | return -EINVAL; |
| 112 | } |
| 113 | |
| 114 | void msm_dsi_pll_destroy(struct msm_dsi_pll *pll) |
| 115 | { |
| 116 | if (pll->destroy) |
| 117 | pll->destroy(pll); |
| 118 | } |
| 119 | |
Hai Li | 328e1a6 | 2015-07-03 10:09:46 -0400 | [diff] [blame] | 120 | void msm_dsi_pll_save_state(struct msm_dsi_pll *pll) |
| 121 | { |
| 122 | if (pll->save_state) { |
| 123 | pll->save_state(pll); |
| 124 | pll->state_saved = true; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | int msm_dsi_pll_restore_state(struct msm_dsi_pll *pll) |
| 129 | { |
| 130 | int ret; |
| 131 | |
| 132 | if (pll->restore_state && pll->state_saved) { |
| 133 | ret = pll->restore_state(pll); |
| 134 | if (ret) |
| 135 | return ret; |
| 136 | |
| 137 | pll->state_saved = false; |
| 138 | } |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 143 | struct msm_dsi_pll *msm_dsi_pll_init(struct platform_device *pdev, |
| 144 | enum msm_dsi_phy_type type, int id) |
| 145 | { |
| 146 | struct device *dev = &pdev->dev; |
| 147 | struct msm_dsi_pll *pll; |
| 148 | |
| 149 | switch (type) { |
| 150 | case MSM_DSI_PHY_28NM_HPM: |
| 151 | case MSM_DSI_PHY_28NM_LP: |
| 152 | pll = msm_dsi_pll_28nm_init(pdev, type, id); |
| 153 | break; |
Archit Taneja | c6538de | 2015-10-14 12:03:44 +0530 | [diff] [blame] | 154 | case MSM_DSI_PHY_28NM_8960: |
| 155 | pll = msm_dsi_pll_28nm_8960_init(pdev, id); |
| 156 | break; |
Hai Li | 825637b | 2015-05-15 13:04:04 -0400 | [diff] [blame] | 157 | default: |
| 158 | pll = ERR_PTR(-ENXIO); |
| 159 | break; |
| 160 | } |
| 161 | |
| 162 | if (IS_ERR(pll)) { |
| 163 | dev_err(dev, "%s: failed to init DSI PLL\n", __func__); |
| 164 | return NULL; |
| 165 | } |
| 166 | |
| 167 | pll->type = type; |
| 168 | |
| 169 | DBG("DSI:%d PLL registered", id); |
| 170 | |
| 171 | return pll; |
| 172 | } |
| 173 | |