Merge tag 'pm+acpi-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...

[linux-drm-fsl-dcu.git] / drivers / pci / pci.c

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e9d4fd861ba1c84a82f9561841d4e1da26715a2a..81f06e8dcc0449688e05b65504413320628b1579 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -10,6 +10,8 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_pci.h>
 #include <linux/pci.h>
 #include <linux/pm.h>
 #include <linux/slab.h>
@@ -521,6 +523,11 @@ static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable)
                        pci_platform_pm->run_wake(dev, enable) : -ENODEV;
 }
 
+static inline bool platform_pci_need_resume(struct pci_dev *dev)
+{
+       return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false;
+}
+
 /**
  * pci_raw_set_power_state - Use PCI PM registers to set the power state of
  *                           given PCI device
@@ -1999,6 +2006,27 @@ bool pci_dev_run_wake(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_dev_run_wake);
 
+/**
+ * pci_dev_keep_suspended - Check if the device can stay in the suspended state.
+ * @pci_dev: Device to check.
+ *
+ * Return 'true' if the device is runtime-suspended, it doesn't have to be
+ * reconfigured due to wakeup settings difference between system and runtime
+ * suspend and the current power state of it is suitable for the upcoming
+ * (system) transition.
+ */
+bool pci_dev_keep_suspended(struct pci_dev *pci_dev)
+{
+       struct device *dev = &pci_dev->dev;
+
+       if (!pm_runtime_suspended(dev)
+           || (device_can_wakeup(dev) && !device_may_wakeup(dev))
+           || platform_pci_need_resume(pci_dev))
+               return false;
+
+       return pci_target_state(pci_dev) == pci_dev->current_state;
+}
+
 void pci_config_pm_runtime_get(struct pci_dev *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -3197,7 +3225,7 @@ static int pci_pm_reset(struct pci_dev *dev, int probe)
 {
        u16 csr;
 
-       if (!dev->pm_cap)
+       if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET)
                return -ENOTTY;
 
        pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr);
@@ -4471,6 +4499,53 @@ int pci_get_new_domain_nr(void)
 {
        return atomic_inc_return(&__domain_nr);
 }
+
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+{
+       static int use_dt_domains = -1;
+       int domain = of_get_pci_domain_nr(parent->of_node);
+
+       /*
+        * Check DT domain and use_dt_domains values.
+        *
+        * If DT domain property is valid (domain >= 0) and
+        * use_dt_domains != 0, the DT assignment is valid since this means
+        * we have not previously allocated a domain number by using
+        * pci_get_new_domain_nr(); we should also update use_dt_domains to
+        * 1, to indicate that we have just assigned a domain number from
+        * DT.
+        *
+        * If DT domain property value is not valid (ie domain < 0), and we
+        * have not previously assigned a domain number from DT
+        * (use_dt_domains != 1) we should assign a domain number by
+        * using the:
+        *
+        * pci_get_new_domain_nr()
+        *
+        * API and update the use_dt_domains value to keep track of method we
+        * are using to assign domain numbers (use_dt_domains = 0).
+        *
+        * All other combinations imply we have a platform that is trying
+        * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
+        * which is a recipe for domain mishandling and it is prevented by
+        * invalidating the domain value (domain = -1) and printing a
+        * corresponding error.
+        */
+       if (domain >= 0 && use_dt_domains) {
+               use_dt_domains = 1;
+       } else if (domain < 0 && use_dt_domains != 1) {
+               use_dt_domains = 0;
+               domain = pci_get_new_domain_nr();
+       } else {
+               dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
+                       parent->of_node->full_name);
+               domain = -1;
+       }
+
+       bus->domain_nr = domain;
+}
+#endif
 #endif
 
 /**