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Subject[RFC PATCH v2 24/32] PCI/ath9k: use PCIe capabilities access functions to simplify implementation
Date
From: Jiang Liu <jiang.liu@huawei.com>

Use PCIe capabilities access functions to simplify ath9k driver's
implementation.

Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
drivers/net/wireless/ath/ath9k/pci.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index a856b51..f90342d 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -112,11 +112,9 @@ static void ath_pci_aspm_init(struct ath_common *common)
struct ath_hw *ah = sc->sc_ah;
struct pci_dev *pdev = to_pci_dev(sc->dev);
struct pci_dev *parent;
- int pos;
- u8 aspm;
+ u16 aspm;

- pos = pci_pcie_cap(pdev);
- if (!pos)
+ if (!pci_is_pcie(pdev))
return;

parent = pdev->bus->self;
@@ -125,24 +123,22 @@ static void ath_pci_aspm_init(struct ath_common *common)

if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
/* Bluetooth coexistance requires disabling ASPM. */
- pci_read_config_byte(pdev, pos + PCI_EXP_LNKCTL, &aspm);
+ pci_pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspm);
aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
- pci_write_config_byte(pdev, pos + PCI_EXP_LNKCTL, aspm);
+ pci_pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, aspm);

/*
* Both upstream and downstream PCIe components should
* have the same ASPM settings.
*/
- pos = pci_pcie_cap(parent);
- pci_read_config_byte(parent, pos + PCI_EXP_LNKCTL, &aspm);
+ pci_pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &aspm);
aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
- pci_write_config_byte(parent, pos + PCI_EXP_LNKCTL, aspm);
+ pci_pcie_capability_write_word(parent, PCI_EXP_LNKCTL, aspm);

return;
}

- pos = pci_pcie_cap(parent);
- pci_read_config_byte(parent, pos + PCI_EXP_LNKCTL, &aspm);
+ pci_pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &aspm);
if (aspm & (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1)) {
ah->aspm_enabled = true;
/* Initialize PCIe PM and SERDES registers. */
--
1.7.9.5


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