The BIOS handoff for the unused EHCI controller on the ExoPC tablet
hangs for 90 seconds on boot. Detect that device, skip negotiation
and force the handoff.
Signed-off-by: Andy Ross <andy.ross@xxxxxxxxxxxxx>
---
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 e230a79..be9c0ce 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"
@@ -218,9 +219,20 @@ 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 tried_handoff = 0, force_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"))
+ force_handoff = 1;
+ }
- if (cap & EHCI_USBLEGSUP_BIOS) {
+ if (!force_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
#if 0
@@ -245,20 +257,23 @@ 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 (!force_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 (!force_handoff)
+ dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
+ " (BIOS bug?) %08x\n", cap);
pci_write_config_byte(pdev, offset + 2, 0);
}
--
1.7.1
--
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