diff options
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/pci.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/pci.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/pci.c b/drivers/net/wireless/mediatek/mt76/pci.c index 04c5a692bc85..833923ab2483 100644 --- a/drivers/net/wireless/mediatek/mt76/pci.c +++ b/drivers/net/wireless/mediatek/mt76/pci.c @@ -1,8 +1,9 @@ -// SPDX-License-Identifier: ISC +// SPDX-License-Identifier: BSD-3-Clause-Clear /* * Copyright (C) 2019 Lorenzo Bianconi <lorenzo@kernel.org> */ +#include "mt76.h" #include <linux/pci.h> void mt76_pci_disable_aspm(struct pci_dev *pdev) @@ -44,3 +45,26 @@ void mt76_pci_disable_aspm(struct pci_dev *pdev) aspm_conf); } EXPORT_SYMBOL_GPL(mt76_pci_disable_aspm); + +bool mt76_pci_aspm_supported(struct pci_dev *pdev) +{ + struct pci_dev *parent = pdev->bus->self; + u16 aspm_conf, parent_aspm_conf = 0; + bool result = true; + + pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspm_conf); + aspm_conf &= PCI_EXP_LNKCTL_ASPMC; + if (parent) { + pcie_capability_read_word(parent, PCI_EXP_LNKCTL, + &parent_aspm_conf); + parent_aspm_conf &= PCI_EXP_LNKCTL_ASPMC; + } + + if (!aspm_conf && (!parent || !parent_aspm_conf)) { + /* aspm already disabled */ + result = false; + } + + return result; +} +EXPORT_SYMBOL_GPL(mt76_pci_aspm_supported); |