1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2021 MediaTek Inc. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/component.h> 8 #include <linux/module.h> 9 #include <linux/of_device.h> 10 #include <linux/of_irq.h> 11 #include <linux/platform_device.h> 12 #include <linux/soc/mediatek/mtk-cmdq.h> 13 14 #include "mtk_disp_drv.h" 15 #include "mtk_drm_crtc.h" 16 #include "mtk_drm_ddp_comp.h" 17 18 #define DISP_GAMMA_EN 0x0000 19 #define GAMMA_EN BIT(0) 20 #define DISP_GAMMA_CFG 0x0020 21 #define GAMMA_LUT_EN BIT(1) 22 #define GAMMA_DITHERING BIT(2) 23 #define DISP_GAMMA_SIZE 0x0030 24 #define DISP_GAMMA_LUT 0x0700 25 26 #define LUT_10BIT_MASK 0x03ff 27 28 struct mtk_disp_gamma_data { 29 bool has_dither; 30 bool lut_diff; 31 }; 32 33 /* 34 * struct mtk_disp_gamma - DISP_GAMMA driver structure 35 */ 36 struct mtk_disp_gamma { 37 struct clk *clk; 38 void __iomem *regs; 39 struct cmdq_client_reg cmdq_reg; 40 const struct mtk_disp_gamma_data *data; 41 }; 42 43 int mtk_gamma_clk_enable(struct device *dev) 44 { 45 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 46 47 return clk_prepare_enable(gamma->clk); 48 } 49 50 void mtk_gamma_clk_disable(struct device *dev) 51 { 52 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 53 54 clk_disable_unprepare(gamma->clk); 55 } 56 57 void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, bool lut_diff) 58 { 59 unsigned int i, reg; 60 struct drm_color_lut *lut; 61 void __iomem *lut_base; 62 u32 word; 63 u32 diff[3] = {0}; 64 65 if (state->gamma_lut) { 66 reg = readl(regs + DISP_GAMMA_CFG); 67 reg = reg | GAMMA_LUT_EN; 68 writel(reg, regs + DISP_GAMMA_CFG); 69 lut_base = regs + DISP_GAMMA_LUT; 70 lut = (struct drm_color_lut *)state->gamma_lut->data; 71 for (i = 0; i < MTK_LUT_SIZE; i++) { 72 73 if (!lut_diff || (i % 2 == 0)) { 74 word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) + 75 (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) + 76 ((lut[i].blue >> 6) & LUT_10BIT_MASK); 77 } else { 78 diff[0] = (lut[i].red >> 6) - (lut[i - 1].red >> 6); 79 diff[1] = (lut[i].green >> 6) - (lut[i - 1].green >> 6); 80 diff[2] = (lut[i].blue >> 6) - (lut[i - 1].blue >> 6); 81 82 word = ((diff[0] & LUT_10BIT_MASK) << 20) + 83 ((diff[1] & LUT_10BIT_MASK) << 10) + 84 (diff[2] & LUT_10BIT_MASK); 85 } 86 writel(word, (lut_base + i * 4)); 87 } 88 } 89 } 90 91 void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state) 92 { 93 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 94 bool lut_diff = false; 95 96 if (gamma->data) 97 lut_diff = gamma->data->lut_diff; 98 99 mtk_gamma_set_common(gamma->regs, state, lut_diff); 100 } 101 102 void mtk_gamma_config(struct device *dev, unsigned int w, 103 unsigned int h, unsigned int vrefresh, 104 unsigned int bpc, struct cmdq_pkt *cmdq_pkt) 105 { 106 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 107 108 mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs, 109 DISP_GAMMA_SIZE); 110 if (gamma->data && gamma->data->has_dither) 111 mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc, 112 DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt); 113 } 114 115 void mtk_gamma_start(struct device *dev) 116 { 117 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 118 119 writel(GAMMA_EN, gamma->regs + DISP_GAMMA_EN); 120 } 121 122 void mtk_gamma_stop(struct device *dev) 123 { 124 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 125 126 writel_relaxed(0x0, gamma->regs + DISP_GAMMA_EN); 127 } 128 129 static int mtk_disp_gamma_bind(struct device *dev, struct device *master, 130 void *data) 131 { 132 return 0; 133 } 134 135 static void mtk_disp_gamma_unbind(struct device *dev, struct device *master, 136 void *data) 137 { 138 } 139 140 static const struct component_ops mtk_disp_gamma_component_ops = { 141 .bind = mtk_disp_gamma_bind, 142 .unbind = mtk_disp_gamma_unbind, 143 }; 144 145 static int mtk_disp_gamma_probe(struct platform_device *pdev) 146 { 147 struct device *dev = &pdev->dev; 148 struct mtk_disp_gamma *priv; 149 struct resource *res; 150 int ret; 151 152 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 153 if (!priv) 154 return -ENOMEM; 155 156 priv->clk = devm_clk_get(dev, NULL); 157 if (IS_ERR(priv->clk)) { 158 dev_err(dev, "failed to get gamma clk\n"); 159 return PTR_ERR(priv->clk); 160 } 161 162 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 163 priv->regs = devm_ioremap_resource(dev, res); 164 if (IS_ERR(priv->regs)) { 165 dev_err(dev, "failed to ioremap gamma\n"); 166 return PTR_ERR(priv->regs); 167 } 168 169 #if IS_REACHABLE(CONFIG_MTK_CMDQ) 170 ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0); 171 if (ret) 172 dev_dbg(dev, "get mediatek,gce-client-reg fail!\n"); 173 #endif 174 175 priv->data = of_device_get_match_data(dev); 176 platform_set_drvdata(pdev, priv); 177 178 ret = component_add(dev, &mtk_disp_gamma_component_ops); 179 if (ret) 180 dev_err(dev, "Failed to add component: %d\n", ret); 181 182 return ret; 183 } 184 185 static int mtk_disp_gamma_remove(struct platform_device *pdev) 186 { 187 component_del(&pdev->dev, &mtk_disp_gamma_component_ops); 188 189 return 0; 190 } 191 192 static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = { 193 .has_dither = true, 194 }; 195 196 static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = { 197 .lut_diff = true, 198 }; 199 200 static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = { 201 { .compatible = "mediatek,mt8173-disp-gamma", 202 .data = &mt8173_gamma_driver_data}, 203 { .compatible = "mediatek,mt8183-disp-gamma", 204 .data = &mt8183_gamma_driver_data}, 205 {}, 206 }; 207 MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match); 208 209 struct platform_driver mtk_disp_gamma_driver = { 210 .probe = mtk_disp_gamma_probe, 211 .remove = mtk_disp_gamma_remove, 212 .driver = { 213 .name = "mediatek-disp-gamma", 214 .owner = THIS_MODULE, 215 .of_match_table = mtk_disp_gamma_driver_dt_match, 216 }, 217 }; 218