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ehci: workaround for pci quirk timeout on ExoPC

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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@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andy Ross 2011-05-11 15:52:38 -07:00 committed by Greg Kroah-Hartman
parent 5c853013dc
commit 3610ea5397
1 changed files with 25 additions and 10 deletions
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35
drivers/usb/host/pci-quirks.c
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@ -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;
if (cap & EHCI_USBLEGSUP_BIOS) {
/* 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 (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);
}