1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 NXP. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/of_device.h> 8 #include <linux/of_graph.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/slab.h> 11 #include <drm/drm_bridge_connector.h> 12 #include <drm/drm_device.h> 13 #include <drm/drm_modeset_helper.h> 14 15 #include "dcss-dev.h" 16 #include "dcss-kms.h" 17 18 static void dcss_clocks_enable(struct dcss_dev *dcss) 19 { 20 clk_prepare_enable(dcss->axi_clk); 21 clk_prepare_enable(dcss->apb_clk); 22 clk_prepare_enable(dcss->rtrm_clk); 23 clk_prepare_enable(dcss->dtrc_clk); 24 clk_prepare_enable(dcss->pix_clk); 25 } 26 27 static void dcss_clocks_disable(struct dcss_dev *dcss) 28 { 29 clk_disable_unprepare(dcss->pix_clk); 30 clk_disable_unprepare(dcss->dtrc_clk); 31 clk_disable_unprepare(dcss->rtrm_clk); 32 clk_disable_unprepare(dcss->apb_clk); 33 clk_disable_unprepare(dcss->axi_clk); 34 } 35 36 static void dcss_disable_dtg_and_ss_cb(void *data) 37 { 38 struct dcss_dev *dcss = data; 39 40 dcss->disable_callback = NULL; 41 42 dcss_ss_shutoff(dcss->ss); 43 dcss_dtg_shutoff(dcss->dtg); 44 45 complete(&dcss->disable_completion); 46 } 47 48 void dcss_disable_dtg_and_ss(struct dcss_dev *dcss) 49 { 50 dcss->disable_callback = dcss_disable_dtg_and_ss_cb; 51 } 52 53 void dcss_enable_dtg_and_ss(struct dcss_dev *dcss) 54 { 55 if (dcss->disable_callback) 56 dcss->disable_callback = NULL; 57 58 dcss_dtg_enable(dcss->dtg); 59 dcss_ss_enable(dcss->ss); 60 } 61 62 static int dcss_submodules_init(struct dcss_dev *dcss) 63 { 64 int ret = 0; 65 u32 base_addr = dcss->start_addr; 66 const struct dcss_type_data *devtype = dcss->devtype; 67 68 dcss_clocks_enable(dcss); 69 70 ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs); 71 if (ret) 72 return ret; 73 74 ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs); 75 if (ret) 76 goto ctxld_err; 77 78 ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs); 79 if (ret) 80 goto dtg_err; 81 82 ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs); 83 if (ret) 84 goto ss_err; 85 86 ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs); 87 if (ret) 88 goto dpr_err; 89 90 ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs); 91 if (ret) 92 goto scaler_err; 93 94 dcss_clocks_disable(dcss); 95 96 return 0; 97 98 scaler_err: 99 dcss_dpr_exit(dcss->dpr); 100 101 dpr_err: 102 dcss_ss_exit(dcss->ss); 103 104 ss_err: 105 dcss_dtg_exit(dcss->dtg); 106 107 dtg_err: 108 dcss_ctxld_exit(dcss->ctxld); 109 110 ctxld_err: 111 dcss_blkctl_exit(dcss->blkctl); 112 113 dcss_clocks_disable(dcss); 114 115 return ret; 116 } 117 118 static void dcss_submodules_stop(struct dcss_dev *dcss) 119 { 120 dcss_clocks_enable(dcss); 121 dcss_scaler_exit(dcss->scaler); 122 dcss_dpr_exit(dcss->dpr); 123 dcss_ss_exit(dcss->ss); 124 dcss_dtg_exit(dcss->dtg); 125 dcss_ctxld_exit(dcss->ctxld); 126 dcss_blkctl_exit(dcss->blkctl); 127 dcss_clocks_disable(dcss); 128 } 129 130 static int dcss_clks_init(struct dcss_dev *dcss) 131 { 132 int i; 133 struct { 134 const char *id; 135 struct clk **clk; 136 } clks[] = { 137 {"apb", &dcss->apb_clk}, 138 {"axi", &dcss->axi_clk}, 139 {"pix", &dcss->pix_clk}, 140 {"rtrm", &dcss->rtrm_clk}, 141 {"dtrc", &dcss->dtrc_clk}, 142 }; 143 144 for (i = 0; i < ARRAY_SIZE(clks); i++) { 145 *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id); 146 if (IS_ERR(*clks[i].clk)) { 147 dev_err(dcss->dev, "failed to get %s clock\n", 148 clks[i].id); 149 return PTR_ERR(*clks[i].clk); 150 } 151 } 152 153 return 0; 154 } 155 156 static void dcss_clks_release(struct dcss_dev *dcss) 157 { 158 devm_clk_put(dcss->dev, dcss->dtrc_clk); 159 devm_clk_put(dcss->dev, dcss->rtrm_clk); 160 devm_clk_put(dcss->dev, dcss->pix_clk); 161 devm_clk_put(dcss->dev, dcss->axi_clk); 162 devm_clk_put(dcss->dev, dcss->apb_clk); 163 } 164 165 struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output) 166 { 167 struct platform_device *pdev = to_platform_device(dev); 168 int ret; 169 struct resource *res; 170 struct dcss_dev *dcss; 171 const struct dcss_type_data *devtype; 172 173 devtype = of_device_get_match_data(dev); 174 if (!devtype) { 175 dev_err(dev, "no device match found\n"); 176 return ERR_PTR(-ENODEV); 177 } 178 179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 180 if (!res) { 181 dev_err(dev, "cannot get memory resource\n"); 182 return ERR_PTR(-EINVAL); 183 } 184 185 dcss = kzalloc(sizeof(*dcss), GFP_KERNEL); 186 if (!dcss) 187 return ERR_PTR(-ENOMEM); 188 189 dcss->dev = dev; 190 dcss->devtype = devtype; 191 dcss->hdmi_output = hdmi_output; 192 193 ret = dcss_clks_init(dcss); 194 if (ret) { 195 dev_err(dev, "clocks initialization failed\n"); 196 goto err; 197 } 198 199 dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0); 200 if (!dcss->of_port) { 201 dev_err(dev, "no port@0 node in %s\n", dev->of_node->full_name); 202 ret = -ENODEV; 203 goto clks_err; 204 } 205 206 dcss->start_addr = res->start; 207 208 ret = dcss_submodules_init(dcss); 209 if (ret) { 210 dev_err(dev, "submodules initialization failed\n"); 211 goto clks_err; 212 } 213 214 init_completion(&dcss->disable_completion); 215 216 pm_runtime_set_autosuspend_delay(dev, 100); 217 pm_runtime_use_autosuspend(dev); 218 pm_runtime_set_suspended(dev); 219 pm_runtime_allow(dev); 220 pm_runtime_enable(dev); 221 222 return dcss; 223 224 clks_err: 225 dcss_clks_release(dcss); 226 227 err: 228 kfree(dcss); 229 230 return ERR_PTR(ret); 231 } 232 233 void dcss_dev_destroy(struct dcss_dev *dcss) 234 { 235 if (!pm_runtime_suspended(dcss->dev)) { 236 dcss_ctxld_suspend(dcss->ctxld); 237 dcss_clocks_disable(dcss); 238 } 239 240 pm_runtime_disable(dcss->dev); 241 242 dcss_submodules_stop(dcss); 243 244 dcss_clks_release(dcss); 245 246 kfree(dcss); 247 } 248 249 #ifdef CONFIG_PM_SLEEP 250 int dcss_dev_suspend(struct device *dev) 251 { 252 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev); 253 struct drm_device *ddev = dcss_drv_dev_to_drm(dev); 254 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base); 255 int ret; 256 257 drm_bridge_connector_disable_hpd(kms->connector); 258 259 drm_mode_config_helper_suspend(ddev); 260 261 if (pm_runtime_suspended(dev)) 262 return 0; 263 264 ret = dcss_ctxld_suspend(dcss->ctxld); 265 if (ret) 266 return ret; 267 268 dcss_clocks_disable(dcss); 269 270 return 0; 271 } 272 273 int dcss_dev_resume(struct device *dev) 274 { 275 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev); 276 struct drm_device *ddev = dcss_drv_dev_to_drm(dev); 277 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base); 278 279 if (pm_runtime_suspended(dev)) { 280 drm_mode_config_helper_resume(ddev); 281 return 0; 282 } 283 284 dcss_clocks_enable(dcss); 285 286 dcss_blkctl_cfg(dcss->blkctl); 287 288 dcss_ctxld_resume(dcss->ctxld); 289 290 drm_mode_config_helper_resume(ddev); 291 292 drm_bridge_connector_enable_hpd(kms->connector); 293 294 return 0; 295 } 296 #endif /* CONFIG_PM_SLEEP */ 297 298 #ifdef CONFIG_PM 299 int dcss_dev_runtime_suspend(struct device *dev) 300 { 301 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev); 302 int ret; 303 304 ret = dcss_ctxld_suspend(dcss->ctxld); 305 if (ret) 306 return ret; 307 308 dcss_clocks_disable(dcss); 309 310 return 0; 311 } 312 313 int dcss_dev_runtime_resume(struct device *dev) 314 { 315 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev); 316 317 dcss_clocks_enable(dcss); 318 319 dcss_blkctl_cfg(dcss->blkctl); 320 321 dcss_ctxld_resume(dcss->ctxld); 322 323 return 0; 324 } 325 #endif /* CONFIG_PM */ 326