diff options
| author | Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> | 2014-06-16 16:37:20 (GMT) |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2014-06-19 19:49:26 (GMT) |
| commit | 2bdc0700263ff2c557fa566881721394abfc2ea4 (patch) | |
| tree | 987ccb7375dfbd44ee32939a60002fdb223f75f2 /drivers/net/wireless/ath | |
| parent | 95266dc07d52b28d7cedb755e2ff4254bb2d7eec (diff) | |
| download | linux-2bdc0700263ff2c557fa566881721394abfc2ea4.tar.xz | |
wil6210: work around for platforms with broken INTx
There are platforms where INTx can't be routed by ACPI,
this leads to pci_enable_device failure. Re-try pretending we have
MSI already configured; in this case pci_enable_device do not try
to configure INTx. However, MSI could still work.
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/wil6210/pcie_bus.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c index 05c1c9d..77b6272 100644 --- a/drivers/net/wireless/ath/wil6210/pcie_bus.c +++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c @@ -35,6 +35,13 @@ static int wil_if_pcie_enable(struct wil6210_priv *wil) { struct pci_dev *pdev = wil->pdev; int rc; + /* on platforms with buggy ACPI, pdev->msi_enabled may be set to + * allow pci_enable_device to work. This indicates INTx was not routed + * and only MSI should be used + */ + int msi_only = pdev->msi_enabled; + + pdev->msi_enabled = 0; pci_set_master(pdev); @@ -66,6 +73,12 @@ static int wil_if_pcie_enable(struct wil6210_priv *wil) wil->n_msi = use_msi; + if ((wil->n_msi == 0) && msi_only) { + wil_err(wil, "Interrupt pin not routed, unable to use INTx\n"); + rc = -ENODEV; + goto stop_master; + } + rc = wil6210_init_irq(wil, pdev->irq); if (rc) goto stop_master; @@ -124,9 +137,16 @@ static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) rc = pci_enable_device(pdev); if (rc) { - dev_err(&pdev->dev, "pci_enable_device failed\n"); - return -ENODEV; + dev_err(&pdev->dev, + "pci_enable_device failed, retry with MSI only\n"); + /* Work around for platforms that can't allocate IRQ: + * retry with MSI only + */ + pdev->msi_enabled = 1; + rc = pci_enable_device(pdev); } + if (rc) + return -ENODEV; /* rollback to err_disable_pdev */ rc = pci_request_region(pdev, 0, WIL_NAME); |