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rtlwifi: add MSI interrupts mode support 

Add MSI interrupts mode support, enable it when submodules' msi_support
flag is true, also could fallback to pin-based interrupts mode if MSI
interrupts mode fails.

RealTek's policy(on modules which work well with MSI interrupts mode) is:

> If the platform supports both MSI and pin-based, use MSI.
> If the platform supports MSI only, use MSI.
> If the platform supports pin-based only, use pin-based.

Also as RealTek's testing results, RTL8188EE and RTL8723BE work well
with both MSI mode and pin-based mode fallback.

Signed-off-by: Adam Lee <adam.lee@canonical.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Adam Lee 2014-03-28 11:36:18 +08:00 committed by John W. Linville
parent 52250cbee7
commit 94010fa0dd
1 changed files with 63 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/net/wireless/rtlwifi/pci.c
View File

@ -1853,6 +1853,65 @@ static bool _rtl_pci_find_adapter(struct pci_dev *pdev,
return true;
}
static int rtl_pci_intr_mode_msi(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_pci_priv *pcipriv = rtl_pcipriv(hw);
struct rtl_pci *rtlpci = rtl_pcidev(pcipriv);
int ret;
ret = pci_enable_msi(rtlpci->pdev);
if (ret < 0)
return ret;
ret = request_irq(rtlpci->pdev->irq, &_rtl_pci_interrupt,
IRQF_SHARED, KBUILD_MODNAME, hw);
if (ret < 0) {
pci_disable_msi(rtlpci->pdev);
return ret;
}
rtlpci->using_msi = true;
RT_TRACE(rtlpriv, COMP_INIT|COMP_INTR, DBG_DMESG,
"MSI Interrupt Mode!\n");
return 0;
}
static int rtl_pci_intr_mode_legacy(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_pci_priv *pcipriv = rtl_pcipriv(hw);
struct rtl_pci *rtlpci = rtl_pcidev(pcipriv);
int ret;
ret = request_irq(rtlpci->pdev->irq, &_rtl_pci_interrupt,
IRQF_SHARED, KBUILD_MODNAME, hw);
if (ret < 0)
return ret;
rtlpci->using_msi = false;
RT_TRACE(rtlpriv, COMP_INIT|COMP_INTR, DBG_DMESG,
"Pin-based Interrupt Mode!\n");
return 0;
}
static int rtl_pci_intr_mode_decide(struct ieee80211_hw *hw)
{
struct rtl_pci_priv *pcipriv = rtl_pcipriv(hw);
struct rtl_pci *rtlpci = rtl_pcidev(pcipriv);
int ret;
if (rtlpci->msi_support) {
ret = rtl_pci_intr_mode_msi(hw);
if (ret < 0)
ret = rtl_pci_intr_mode_legacy(hw);
} else {
ret = rtl_pci_intr_mode_legacy(hw);
}
return ret;
}
int rtl_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
@ -1995,8 +2054,7 @@ int rtl_pci_probe(struct pci_dev *pdev,
}
rtlpci = rtl_pcidev(pcipriv);
err = request_irq(rtlpci->pdev->irq, &_rtl_pci_interrupt,
IRQF_SHARED, KBUILD_MODNAME, hw);
err = rtl_pci_intr_mode_decide(hw);
if (err) {
RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG,
"%s: failed to register IRQ handler\n",
@ -2064,6 +2122,9 @@ void rtl_pci_disconnect(struct pci_dev *pdev)
rtlpci->irq_alloc = 0;
}
if (rtlpci->using_msi)
pci_disable_msi(rtlpci->pdev);
list_del(&rtlpriv->list);
if (rtlpriv->io.pci_mem_start != 0) {
pci_iounmap(pdev, (void __iomem *)rtlpriv->io.pci_mem_start);