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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>
This commit is contained in:
Vladimir Kondratiev 2014-06-16 19:37:20 +03:00 committed by John W. Linville
parent 95266dc07d
commit 2bdc070026
1 changed files with 22 additions and 2 deletions
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24
drivers/net/wireless/ath/wil6210/pcie_bus.c
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@ -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);