iwlwifi: pcie: add RTPM support when wifi is enabled

Enable runtime power management (RTPM) for PCIe devices and implement
the corresponding functions to enable D0i3 mode when the device is
idle.

Additionally, remove some unnecessary #ifdef's because the RTPM code
will not be called if runtime PM is not configured.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 86 insertions, 12 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index 676d2391eb66..16b579a5aa6b 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -67,9 +67,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/module.h>
-#ifdef CONFIG_IWLWIFI_PCIE_RTPM
 #include <linux/pm_runtime.h>
-#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
 #include <linux/pci.h>
 #include <linux/pci-aspm.h>
 #include <linux/acpi.h>
@@ -627,13 +625,15 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		goto out_free_drv;
 
-#ifdef CONFIG_IWLWIFI_PCIE_RTPM
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_set_autosuspend_delay(&pdev->dev,
+	/* if RTPM is in use, enable it in our device */
+	if (iwl_trans->runtime_pm_mode != IWL_PLAT_PM_MODE_DISABLED) {
+		pm_runtime_set_active(&pdev->dev);
+		pm_runtime_set_autosuspend_delay(&pdev->dev,
 					 iwlwifi_mod_params.d0i3_entry_delay);
-	pm_runtime_use_autosuspend(&pdev->dev);
-	pm_runtime_allow(&pdev->dev);
-#endif
+		pm_runtime_use_autosuspend(&pdev->dev);
+		pm_runtime_allow(&pdev->dev);
+	}
+
 	return 0;
 
 out_free_drv:
@@ -700,17 +700,90 @@ static int iwl_pci_resume(struct device *device)
 	return 0;
 }
 
+int iwl_pci_fw_enter_d0i3(struct iwl_trans *trans)
+{
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+	int ret;
+
+	if (test_bit(STATUS_FW_ERROR, &trans->status))
+		return 0;
+
+	set_bit(STATUS_TRANS_GOING_IDLE, &trans->status);
+
+	/* config the fw */
+	ret = iwl_op_mode_enter_d0i3(trans->op_mode);
+	if (ret == 1) {
+		IWL_DEBUG_RPM(trans, "aborting d0i3 entrance\n");
+		clear_bit(STATUS_TRANS_GOING_IDLE, &trans->status);
+		return -EBUSY;
+	}
+	if (ret)
+		goto err;
+
+	ret = wait_event_timeout(trans_pcie->d0i3_waitq,
+				 test_bit(STATUS_TRANS_IDLE, &trans->status),
+				 msecs_to_jiffies(IWL_TRANS_IDLE_TIMEOUT));
+	if (!ret) {
+		IWL_ERR(trans, "Timeout entering D0i3\n");
+		ret = -ETIMEDOUT;
+		goto err;
+	}
+
+	clear_bit(STATUS_TRANS_GOING_IDLE, &trans->status);
+
+	return 0;
+err:
+	clear_bit(STATUS_TRANS_GOING_IDLE, &trans->status);
+	iwl_trans_fw_error(trans);
+	return ret;
+}
+
+int iwl_pci_fw_exit_d0i3(struct iwl_trans *trans)
+{
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+	int ret;
+
+	/* sometimes a D0i3 entry is not followed through */
+	if (!test_bit(STATUS_TRANS_IDLE, &trans->status))
+		return 0;
+
+	/* config the fw */
+	ret = iwl_op_mode_exit_d0i3(trans->op_mode);
+	if (ret)
+		goto err;
+
+	/* we clear STATUS_TRANS_IDLE only when D0I3_END command is completed */
+
+	ret = wait_event_timeout(trans_pcie->d0i3_waitq,
+				 !test_bit(STATUS_TRANS_IDLE, &trans->status),
+				 msecs_to_jiffies(IWL_TRANS_IDLE_TIMEOUT));
+	if (!ret) {
+		IWL_ERR(trans, "Timeout exiting D0i3\n");
+		ret = -ETIMEDOUT;
+		goto err;
+	}
+
+	return 0;
+err:
+	clear_bit(STATUS_TRANS_IDLE, &trans->status);
+	iwl_trans_fw_error(trans);
+	return ret;
+}
+
 #ifdef CONFIG_IWLWIFI_PCIE_RTPM
 static int iwl_pci_runtime_suspend(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct iwl_trans *trans = pci_get_drvdata(pdev);
+	int ret;
 
 	IWL_DEBUG_RPM(trans, "entering runtime suspend\n");
 
-	/* For now we only allow D0I3 if the device is off */
-	if (test_bit(STATUS_DEVICE_ENABLED, &trans->status))
-		return -EBUSY;
+	if (test_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
+		ret = iwl_pci_fw_enter_d0i3(trans);
+		if (ret < 0)
+			return ret;
+	}
 
 	trans->system_pm_mode = IWL_PLAT_PM_MODE_D0I3;
 
@@ -729,7 +802,8 @@ static int iwl_pci_runtime_resume(struct device *device)
 
 	iwl_trans_d3_resume(trans, &d3_status, false);
 
-	trans->system_pm_mode = IWL_PLAT_PM_MODE_D3;
+	if (test_bit(STATUS_DEVICE_ENABLED, &trans->status))
+		return iwl_pci_fw_exit_d0i3(trans);
 
 	return 0;
 }