target/linux/mediatek/patches-4.19/0101-pci-mediatek-backport-fix-pcie.patch

   1 --- a/drivers/clk/clk-devres.c
   2 +++ b/drivers/clk/clk-devres.c
   3 @@ -34,6 +34,17 @@ struct clk *devm_clk_get(struct device *
   4  }
   5  EXPORT_SYMBOL(devm_clk_get);
   6
   7 +struct clk *devm_clk_get_optional(struct device *dev, const char *id)
   8 +{
   9 +        struct clk *clk = devm_clk_get(dev, id);
  10 +
  11 +        if (clk == ERR_PTR(-ENOENT))
  12 +                return NULL;
  13 +
  14 +        return clk;
  15 +}
  16 +EXPORT_SYMBOL(devm_clk_get_optional);
  17 +
  18  struct clk_bulk_devres {
  19         struct clk_bulk_data *clks;
  20         int num_clks;
  21 --- a/drivers/pci/controller/pcie-mediatek.c
  22 +++ b/drivers/pci/controller/pcie-mediatek.c
  23 @@ -15,6 +15,7 @@
  24  #include <linux/irqdomain.h>
  25  #include <linux/kernel.h>
  26  #include <linux/msi.h>
  27 +#include <linux/module.h>
  28  #include <linux/of_address.h>
  29  #include <linux/of_pci.h>
  30  #include <linux/of_platform.h>
  31 @@ -162,6 +163,7 @@ struct mtk_pcie_soc {
  32   * @phy: pointer to PHY control block
  33   * @lane: lane count
  34   * @slot: port slot
  35 + * @irq: GIC irq
  36   * @irq_domain: legacy INTx IRQ domain
  37   * @inner_domain: inner IRQ domain
  38   * @msi_domain: MSI IRQ domain
  39 @@ -182,6 +184,7 @@ struct mtk_pcie_port {
  40         struct phy *phy;
  41         u32 lane;
  42         u32 slot;
  43 +       int irq;
  44         struct irq_domain *irq_domain;
  45         struct irq_domain *inner_domain;
  46         struct irq_domain *msi_domain;
  47 @@ -225,10 +228,8 @@ static void mtk_pcie_subsys_powerdown(st
  48
  49         clk_disable_unprepare(pcie->free_ck);
  50
  51 -       if (dev->pm_domain) {
  52 -               pm_runtime_put_sync(dev);
  53 -               pm_runtime_disable(dev);
  54 -       }
  55 +       pm_runtime_put_sync(dev);
  56 +       pm_runtime_disable(dev);
  57  }
  58
  59  static void mtk_pcie_port_free(struct mtk_pcie_port *port)
  60 @@ -532,6 +533,27 @@ static void mtk_pcie_enable_msi(struct m
  61         writel(val, port->base + PCIE_INT_MASK);
  62  }
  63
  64 +static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
  65 +{
  66 +       struct mtk_pcie_port *port, *tmp;
  67 +
  68 +       list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
  69 +               irq_set_chained_handler_and_data(port->irq, NULL, NULL);
  70 +
  71 +               if (port->irq_domain)
  72 +                       irq_domain_remove(port->irq_domain);
  73 +
  74 +               if (IS_ENABLED(CONFIG_PCI_MSI)) {
  75 +                       if (port->msi_domain)
  76 +                               irq_domain_remove(port->msi_domain);
  77 +                       if (port->inner_domain)
  78 +                               irq_domain_remove(port->inner_domain);
  79 +               }
  80 +
  81 +               irq_dispose_mapping(port->irq);
  82 +       }
  83 +}
  84 +
  85  static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
  86                              irq_hw_number_t hwirq)
  87  {
  88 @@ -561,6 +583,7 @@ static int mtk_pcie_init_irq_domain(stru
  89
  90         port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
  91                                                  &intx_domain_ops, port);
  92 +       of_node_put(pcie_intc_node);
  93         if (!port->irq_domain) {
  94                 dev_err(dev, "failed to get INTx IRQ domain\n");
  95                 return -ENODEV;
  96 @@ -622,7 +645,7 @@ static int mtk_pcie_setup_irq(struct mtk
  97         struct mtk_pcie *pcie = port->pcie;
  98         struct device *dev = pcie->dev;
  99         struct platform_device *pdev = to_platform_device(dev);
 100 -       int err, irq;
 101 +       int err;
 102
 103         err = mtk_pcie_init_irq_domain(port, node);
 104         if (err) {
 105 @@ -630,8 +653,9 @@ static int mtk_pcie_setup_irq(struct mtk
 106                 return err;
 107         }
 108
 109 -       irq = platform_get_irq(pdev, port->slot);
 110 -       irq_set_chained_handler_and_data(irq, mtk_pcie_intr_handler, port);
 111 +       port->irq = platform_get_irq(pdev, port->slot);
 112 +       irq_set_chained_handler_and_data(port->irq,
 113 +                                        mtk_pcie_intr_handler, port);
 114
 115         return 0;
 116  }
 117 @@ -904,49 +928,29 @@ static int mtk_pcie_parse_port(struct mt
 118
 119         /* sys_ck might be divided into the following parts in some chips */
 120         snprintf(name, sizeof(name), "ahb_ck%d", slot);
 121 -       port->ahb_ck = devm_clk_get(dev, name);
 122 -       if (IS_ERR(port->ahb_ck)) {
 123 -               if (PTR_ERR(port->ahb_ck) == -EPROBE_DEFER)
 124 -                       return -EPROBE_DEFER;
 125 -
 126 -               port->ahb_ck = NULL;
 127 -       }
 128 +       port->ahb_ck = devm_clk_get_optional(dev, name);
 129 +       if (IS_ERR(port->ahb_ck))
 130 +               return PTR_ERR(port->ahb_ck);
 131
 132         snprintf(name, sizeof(name), "axi_ck%d", slot);
 133 -       port->axi_ck = devm_clk_get(dev, name);
 134 -       if (IS_ERR(port->axi_ck)) {
 135 -               if (PTR_ERR(port->axi_ck) == -EPROBE_DEFER)
 136 -                       return -EPROBE_DEFER;
 137 -
 138 -               port->axi_ck = NULL;
 139 -       }
 140 +       port->axi_ck = devm_clk_get_optional(dev, name);
 141 +       if (IS_ERR(port->axi_ck))
 142 +               return PTR_ERR(port->axi_ck);
 143
 144         snprintf(name, sizeof(name), "aux_ck%d", slot);
 145 -       port->aux_ck = devm_clk_get(dev, name);
 146 -       if (IS_ERR(port->aux_ck)) {
 147 -               if (PTR_ERR(port->aux_ck) == -EPROBE_DEFER)
 148 -                       return -EPROBE_DEFER;
 149 -
 150 -               port->aux_ck = NULL;
 151 -       }
 152 +       port->aux_ck = devm_clk_get_optional(dev, name);
 153 +       if (IS_ERR(port->aux_ck))
 154 +               return PTR_ERR(port->aux_ck);
 155
 156         snprintf(name, sizeof(name), "obff_ck%d", slot);
 157 -       port->obff_ck = devm_clk_get(dev, name);
 158 -       if (IS_ERR(port->obff_ck)) {
 159 -               if (PTR_ERR(port->obff_ck) == -EPROBE_DEFER)
 160 -                       return -EPROBE_DEFER;
 161 -
 162 -               port->obff_ck = NULL;
 163 -       }
 164 +       port->obff_ck = devm_clk_get_optional(dev, name);
 165 +       if (IS_ERR(port->obff_ck))
 166 +               return PTR_ERR(port->obff_ck);
 167
 168         snprintf(name, sizeof(name), "pipe_ck%d", slot);
 169 -       port->pipe_ck = devm_clk_get(dev, name);
 170 -       if (IS_ERR(port->pipe_ck)) {
 171 -               if (PTR_ERR(port->pipe_ck) == -EPROBE_DEFER)
 172 -                       return -EPROBE_DEFER;
 173 -
 174 -               port->pipe_ck = NULL;
 175 -       }
 176 +       port->pipe_ck = devm_clk_get_optional(dev, name);
 177 +       if (IS_ERR(port->pipe_ck))
 178 +               return PTR_ERR(port->pipe_ck);
 179
 180         snprintf(name, sizeof(name), "pcie-rst%d", slot);
 181         port->reset = devm_reset_control_get_optional_exclusive(dev, name);
 182 @@ -999,10 +1003,8 @@ static int mtk_pcie_subsys_powerup(struc
 183                 pcie->free_ck = NULL;
 184         }
 185
 186 -       if (dev->pm_domain) {
 187 -               pm_runtime_enable(dev);
 188 -               pm_runtime_get_sync(dev);
 189 -       }
 190 +       pm_runtime_enable(dev);
 191 +       pm_runtime_get_sync(dev);
 192
 193         /* enable top level clock */
 194         err = clk_prepare_enable(pcie->free_ck);
 195 @@ -1014,10 +1016,8 @@ static int mtk_pcie_subsys_powerup(struc
 196         return 0;
 197
 198  err_free_ck:
 199 -       if (dev->pm_domain) {
 200 -               pm_runtime_put_sync(dev);
 201 -               pm_runtime_disable(dev);
 202 -       }
 203 +       pm_runtime_put_sync(dev);
 204 +       pm_runtime_disable(dev);
 205
 206         return err;
 207  }
 208 @@ -1122,36 +1122,6 @@ static int mtk_pcie_request_resources(st
 209                 return err;
 210
 211         err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start);
 212 -       if (err)
 213 -               return err;
 214 -
 215 -       return 0;
 216 -}
 217 -
 218 -static int mtk_pcie_register_host(struct pci_host_bridge *host)
 219 -{
 220 -       struct mtk_pcie *pcie = pci_host_bridge_priv(host);
 221 -       struct pci_bus *child;
 222 -       int err;
 223 -
 224 -       host->busnr = pcie->busn.start;
 225 -       host->dev.parent = pcie->dev;
 226 -       host->ops = pcie->soc->ops;
 227 -       host->map_irq = of_irq_parse_and_map_pci;
 228 -       host->swizzle_irq = pci_common_swizzle;
 229 -       host->sysdata = pcie;
 230 -
 231 -       err = pci_scan_root_bus_bridge(host);
 232 -       if (err < 0)
 233 -               return err;
 234 -
 235 -       pci_bus_size_bridges(host->bus);
 236 -       pci_bus_assign_resources(host->bus);
 237 -
 238 -       list_for_each_entry(child, &host->bus->children, node)
 239 -               pcie_bus_configure_settings(child);
 240 -
 241 -       pci_bus_add_devices(host->bus);
 242
 243         return 0;
 244  }
 245 @@ -1182,7 +1152,14 @@ static int mtk_pcie_probe(struct platfor
 246         if (err)
 247                 goto put_resources;
 248
 249 -       err = mtk_pcie_register_host(host);
 250 +       host->busnr = pcie->busn.start;
 251 +       host->dev.parent = pcie->dev;
 252 +       host->ops = pcie->soc->ops;
 253 +       host->map_irq = of_irq_parse_and_map_pci;
 254 +       host->swizzle_irq = pci_common_swizzle;
 255 +       host->sysdata = pcie;
 256 +
 257 +       err = pci_host_probe(host);
 258         if (err)
 259                 goto put_resources;
 260
 261 @@ -1195,6 +1172,80 @@ put_resources:
 262         return err;
 263  }
 264
 265 +
 266 +static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
 267 +{
 268 +       struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
 269 +       struct list_head *windows = &host->windows;
 270 +
 271 +       pci_free_resource_list(windows);
 272 +}
 273 +
 274 +static int mtk_pcie_remove(struct platform_device *pdev)
 275 +{
 276 +       struct mtk_pcie *pcie = platform_get_drvdata(pdev);
 277 +       struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
 278 +
 279 +       pci_stop_root_bus(host->bus);
 280 +       pci_remove_root_bus(host->bus);
 281 +       mtk_pcie_free_resources(pcie);
 282 +
 283 +       mtk_pcie_irq_teardown(pcie);
 284 +
 285 +       mtk_pcie_put_resources(pcie);
 286 +
 287 +       return 0;
 288 +}
 289 +
 290 +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
 291 +{
 292 +       struct mtk_pcie *pcie = dev_get_drvdata(dev);
 293 +       struct mtk_pcie_port *port;
 294 +
 295 +       if (list_empty(&pcie->ports))
 296 +               return 0;
 297 +
 298 +       list_for_each_entry(port, &pcie->ports, list) {
 299 +               clk_disable_unprepare(port->pipe_ck);
 300 +               clk_disable_unprepare(port->obff_ck);
 301 +               clk_disable_unprepare(port->axi_ck);
 302 +               clk_disable_unprepare(port->aux_ck);
 303 +               clk_disable_unprepare(port->ahb_ck);
 304 +               clk_disable_unprepare(port->sys_ck);
 305 +               phy_power_off(port->phy);
 306 +               phy_exit(port->phy);
 307 +       }
 308 +
 309 +       clk_disable_unprepare(pcie->free_ck);
 310 +
 311 +       return 0;
 312 +}
 313 +
 314 +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
 315 +{
 316 +       struct mtk_pcie *pcie = dev_get_drvdata(dev);
 317 +       struct mtk_pcie_port *port, *tmp;
 318 +
 319 +       if (list_empty(&pcie->ports))
 320 +               return 0;
 321 +
 322 +       clk_prepare_enable(pcie->free_ck);
 323 +
 324 +       list_for_each_entry_safe(port, tmp, &pcie->ports, list)
 325 +               mtk_pcie_enable_port(port);
 326 +
 327 +       /* In case of EP was removed while system suspend. */
 328 +       if (list_empty(&pcie->ports))
 329 +               clk_disable_unprepare(pcie->free_ck);
 330 +
 331 +       return 0;
 332 +}
 333 +
 334 +static const struct dev_pm_ops mtk_pcie_pm_ops = {
 335 +       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
 336 +                                     mtk_pcie_resume_noirq)
 337 +};
 338 +
 339  static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
 340         .ops = &mtk_pcie_ops,
 341         .startup = mtk_pcie_startup_port,
 342 @@ -1223,10 +1274,13 @@ static const struct of_device_id mtk_pci
 343
 344  static struct platform_driver mtk_pcie_driver = {
 345         .probe = mtk_pcie_probe,
 346 +       .remove = mtk_pcie_remove,
 347         .driver = {
 348                 .name = "mtk-pcie",
 349                 .of_match_table = mtk_pcie_ids,
 350                 .suppress_bind_attrs = true,
 351 +               .pm = &mtk_pcie_pm_ops,
 352         },
 353  };
 354 -builtin_platform_driver(mtk_pcie_driver);
 355 +module_platform_driver(mtk_pcie_driver);
 356 +MODULE_LICENSE("GPL v2");
 357 --- a/include/linux/clk.h
 358 +++ b/include/linux/clk.h
 359 @@ -349,6 +349,17 @@ int __must_check devm_clk_bulk_get(struc
 360  struct clk *devm_clk_get(struct device *dev, const char *id);
 361
 362  /**
 363 + * devm_clk_get_optional - lookup and obtain a managed reference to an optional
 364 + *                         clock producer.
 365 + * @dev: device for clock "consumer"
 366 + * @id: clock consumer ID
 367 + *
 368 + * Behaves the same as devm_clk_get() except where there is no clock producer.
 369 + * In this case, instead of returning -ENOENT, the function returns NULL.
 370 + */
 371 +struct clk *devm_clk_get_optional(struct device *dev, const char *id);
 372 +
 373 +/**
 374   * devm_get_clk_from_child - lookup and obtain a managed reference to a
 375   *                          clock producer from child node.
 376   * @dev: device for clock "consumer"