diff options
| -rw-r--r-- | drivers/usb/host/pci-quirks.c | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index e300509faa61..f16c59d5f487 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -14,6 +14,7 @@ #include <linux/init.h> #include <linux/delay.h> #include <linux/acpi.h> +#include <linux/dmi.h> #include "pci-quirks.h" #include "xhci-ext-caps.h" @@ -507,9 +508,20 @@ static void __devinit ehci_bios_handoff(struct pci_dev *pdev, void __iomem *op_reg_base, u32 cap, u8 offset) { - int msec, tried_handoff = 0; + int try_handoff = 1, tried_handoff = 0; + + /* The Pegatron Lucid (ExoPC) tablet sporadically waits for 90 + * seconds trying the handoff on its unused controller. Skip + * it. */ + if (pdev->vendor == 0x8086 && pdev->device == 0x283a) { + const char *dmi_bn = dmi_get_system_info(DMI_BOARD_NAME); + const char *dmi_bv = dmi_get_system_info(DMI_BIOS_VERSION); + if (dmi_bn && !strcmp(dmi_bn, "EXOPG06411") && + dmi_bv && !strcmp(dmi_bv, "Lucid-CE-133")) + try_handoff = 0; + } - if (cap & EHCI_USBLEGSUP_BIOS) { + if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) { dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n"); #if 0 @@ -534,20 +546,23 @@ static void __devinit ehci_bios_handoff(struct pci_dev *pdev, } /* if boot firmware now owns EHCI, spin till it hands it over. */ - msec = 1000; - while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) { - tried_handoff = 1; - msleep(10); - msec -= 10; - pci_read_config_dword(pdev, offset, &cap); + if (try_handoff) { + int msec = 1000; + while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) { + tried_handoff = 1; + msleep(10); + msec -= 10; + pci_read_config_dword(pdev, offset, &cap); + } } if (cap & EHCI_USBLEGSUP_BIOS) { /* well, possibly buggy BIOS... try to shut it down, * and hope nothing goes too wrong */ - dev_warn(&pdev->dev, "EHCI: BIOS handoff failed" - " (BIOS bug?) %08x\n", cap); + if (try_handoff) + dev_warn(&pdev->dev, "EHCI: BIOS handoff failed" + " (BIOS bug?) %08x\n", cap); pci_write_config_byte(pdev, offset + 2, 0); } |