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iwlwifi: pcie: add initial RTPM support for PCI 

Add an initial implementation of runtime power management (RTPM) for
PCI devices.  With this patch, RTPM is only used when wifi is off
(i.e. the wifi interface is down).  This implementation is behind a
new Kconfig flag, IWLWIFI_PCIE_RTPM.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Luca Coelho 2016-01-06 18:40:38 -02:00 committed by Emmanuel Grumbach
parent 96a6497bc3
commit b3ff127056
3 changed files with 96 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/wireless/intel/iwlwifi/Kconfig
View File

@ -99,6 +99,18 @@ config IWLWIFI_UAPSD
If unsure, say N.
config IWLWIFI_PCIE_RTPM
bool "Enable runtime power management mode for PCIe devices"
depends on IWLMVM && PM
default false
help
Say Y here to enable runtime power management for PCIe
devices. If enabled, the device will go into low power mode
when idle for a short period of time, allowing for improved
power saving during runtime.
If unsure, say N.
menu "Debugging Options"
config IWLWIFI_DEBUG

60
drivers/net/wireless/intel/iwlwifi/pcie/drv.c
View File

@ -7,6 +7,7 @@
*
* Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
* Copyright(c) 2016 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
@ -66,6 +67,9 @@
#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>
@ -623,6 +627,13 @@ 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,
iwlwifi_mod_params.d0i3_entry_delay);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_allow(&pdev->dev);
#endif
return 0;
out_free_drv:
@ -689,15 +700,58 @@ static int iwl_pci_resume(struct device *device)
return 0;
}
static SIMPLE_DEV_PM_OPS(iwl_dev_pm_ops, iwl_pci_suspend, iwl_pci_resume);
#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);
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;
trans->system_pm_mode = IWL_PLAT_PM_MODE_D0I3;
iwl_trans_d3_suspend(trans, false);
return 0;
}
static int iwl_pci_runtime_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct iwl_trans *trans = pci_get_drvdata(pdev);
enum iwl_d3_status d3_status;
IWL_DEBUG_RPM(trans, "exiting runtime suspend (resume)\n");
iwl_trans_d3_resume(trans, &d3_status, false);
trans->system_pm_mode = IWL_PLAT_PM_MODE_D3;
return 0;
}
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
static const struct dev_pm_ops iwl_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(iwl_pci_suspend,
iwl_pci_resume)
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
SET_RUNTIME_PM_OPS(iwl_pci_runtime_suspend,
iwl_pci_runtime_resume,
NULL)
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
};
#define IWL_PM_OPS (&iwl_dev_pm_ops)
#else
#else /* CONFIG_PM_SLEEP */
#define IWL_PM_OPS NULL
#endif
#endif /* CONFIG_PM_SLEEP */
static struct pci_driver iwl_pci_driver = {
.name = DRV_NAME,

27
drivers/net/wireless/intel/iwlwifi/pcie/trans.c
View File

@ -72,6 +72,9 @@
#include <linux/bitops.h>
#include <linux/gfp.h>
#include <linux/vmalloc.h>
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
#include <linux/pm_runtime.h>
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
#include "iwl-drv.h"
#include "iwl-trans.h"
@ -1194,6 +1197,9 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans, bool low_power)
if (hw_rfkill != was_hw_rfkill)
iwl_trans_pcie_rf_kill(trans, hw_rfkill);
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
pm_runtime_put_sync(trans->dev);
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
/* re-take ownership to prevent other users from stealing the deivce */
iwl_pcie_prepare_card_hw(trans);
}
@ -1353,6 +1359,9 @@ static int _iwl_trans_pcie_start_hw(struct iwl_trans *trans, bool low_power)
/* ... rfkill can call stop_device and set it false if needed */
iwl_trans_pcie_rf_kill(trans, hw_rfkill);
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
pm_runtime_get_sync(trans->dev);
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
return 0;
}
@ -1476,6 +1485,10 @@ void iwl_trans_pcie_free(struct iwl_trans *trans)
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int i;
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
/* TODO: check if this is really needed */
pm_runtime_disable(trans->dev);
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
synchronize_irq(trans_pcie->pci_dev->irq);
iwl_pcie_tx_free(trans);
@ -1831,6 +1844,9 @@ void iwl_trans_pcie_ref(struct iwl_trans *trans)
spin_lock_irqsave(&trans_pcie->ref_lock, flags);
IWL_DEBUG_RPM(trans, "ref_counter: %d\n", trans_pcie->ref_count);
trans_pcie->ref_count++;
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
pm_runtime_get(&trans_pcie->pci_dev->dev);
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
spin_unlock_irqrestore(&trans_pcie->ref_lock, flags);
}
@ -1849,6 +1865,11 @@ void iwl_trans_pcie_unref(struct iwl_trans *trans)
return;
}
trans_pcie->ref_count--;
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
pm_runtime_mark_last_busy(&trans_pcie->pci_dev->dev);
pm_runtime_put_autosuspend(&trans_pcie->pci_dev->dev);
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
spin_unlock_irqrestore(&trans_pcie->ref_lock, flags);
}
@ -2728,6 +2749,12 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
trans_pcie->inta_mask = CSR_INI_SET_MASK;
#ifdef CONFIG_IWLWIFI_PCIE_RTPM
trans->runtime_pm_mode = IWL_PLAT_PM_MODE_D0I3;
#else
trans->runtime_pm_mode = IWL_PLAT_PM_MODE_DISABLED;
#endif /* CONFIG_IWLWIFI_PCIE_RTPM */
return trans;
out_free_ict: