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USB: xhci: Fix finding extended capabilities registers

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commit 05197921ff upstream.

According "5.3.6 Capability Parameters (HCCPARAMS)" of xHCI rev0.96 spec,
value of xECP register indicates a relative offset, in 32-bit words,
from Base to the beginning of the first extended capability.
The wrong calculation will cause BIOS handoff fail (not handoff from BIOS)
in some platform with BIOS USB legacy sup support.

Signed-off-by: Edward Shao <laface.tw@gmail.com>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Edward Shao 2010-02-11 03:37:30 +08:00 committed by Greg Kroah-Hartman
parent 75bf39e212
commit bbb4ae3e02
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/host/xhci-ext-caps.h
View File

@ -101,12 +101,15 @@ static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset)
next = readl(base + ext_offset);
if (ext_offset == XHCI_HCC_PARAMS_OFFSET)
if (ext_offset == XHCI_HCC_PARAMS_OFFSET) {
/* Find the first extended capability */
next = XHCI_HCC_EXT_CAPS(next);
else
ext_offset = 0;
} else {
/* Find the next extended capability */
next = XHCI_EXT_CAPS_NEXT(next);
}
if (!next)
return 0;
/*