drivers/gpu/drm/imx/dcss/dcss-dev.c

   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                 of_node_put(dcss->of_port);
 211                 dev_err(dev, "submodules initialization failed\n");
 212                 goto clks_err;
 213         }
 214
 215         init_completion(&dcss->disable_completion);
 216
 217         pm_runtime_set_autosuspend_delay(dev, 100);
 218         pm_runtime_use_autosuspend(dev);
 219         pm_runtime_set_suspended(dev);
 220         pm_runtime_allow(dev);
 221         pm_runtime_enable(dev);
 222
 223         return dcss;
 224
 225 clks_err:
 226         dcss_clks_release(dcss);
 227
 228 err:
 229         kfree(dcss);
 230
 231         return ERR_PTR(ret);
 232 }
 233
 234 void dcss_dev_destroy(struct dcss_dev *dcss)
 235 {
 236         if (!pm_runtime_suspended(dcss->dev)) {
 237                 dcss_ctxld_suspend(dcss->ctxld);
 238                 dcss_clocks_disable(dcss);
 239         }
 240
 241         of_node_put(dcss->of_port);
 242
 243         pm_runtime_disable(dcss->dev);
 244
 245         dcss_submodules_stop(dcss);
 246
 247         dcss_clks_release(dcss);
 248
 249         kfree(dcss);
 250 }
 251
 252 #ifdef CONFIG_PM_SLEEP
 253 int dcss_dev_suspend(struct device *dev)
 254 {
 255         struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 256         struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
 257         struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
 258         int ret;
 259
 260         drm_bridge_connector_disable_hpd(kms->connector);
 261
 262         drm_mode_config_helper_suspend(ddev);
 263
 264         if (pm_runtime_suspended(dev))
 265                 return 0;
 266
 267         ret = dcss_ctxld_suspend(dcss->ctxld);
 268         if (ret)
 269                 return ret;
 270
 271         dcss_clocks_disable(dcss);
 272
 273         return 0;
 274 }
 275
 276 int dcss_dev_resume(struct device *dev)
 277 {
 278         struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 279         struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
 280         struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
 281
 282         if (pm_runtime_suspended(dev)) {
 283                 drm_mode_config_helper_resume(ddev);
 284                 return 0;
 285         }
 286
 287         dcss_clocks_enable(dcss);
 288
 289         dcss_blkctl_cfg(dcss->blkctl);
 290
 291         dcss_ctxld_resume(dcss->ctxld);
 292
 293         drm_mode_config_helper_resume(ddev);
 294
 295         drm_bridge_connector_enable_hpd(kms->connector);
 296
 297         return 0;
 298 }
 299 #endif /* CONFIG_PM_SLEEP */
 300
 301 #ifdef CONFIG_PM
 302 int dcss_dev_runtime_suspend(struct device *dev)
 303 {
 304         struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 305         int ret;
 306
 307         ret = dcss_ctxld_suspend(dcss->ctxld);
 308         if (ret)
 309                 return ret;
 310
 311         dcss_clocks_disable(dcss);
 312
 313         return 0;
 314 }
 315
 316 int dcss_dev_runtime_resume(struct device *dev)
 317 {
 318         struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 319
 320         dcss_clocks_enable(dcss);
 321
 322         dcss_blkctl_cfg(dcss->blkctl);
 323
 324         dcss_ctxld_resume(dcss->ctxld);
 325
 326         return 0;
 327 }
 328 #endif /* CONFIG_PM */