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authorAlan Stern <stern@rowland.harvard.edu>2011-10-12 18:39:14 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-19 00:49:33 +0400
commit68aa95d5d4de31c9348c1628ffa85c805305ebc5 (patch)
tree7782dad26b9672be03b78a70cae1105f395dafe2 /Kconfig
parent91960c2ef095c4b0744349e80a933921cbdcfd6e (diff)
downloadlinux-68aa95d5d4de31c9348c1628ffa85c805305ebc5.tar.xz
EHCI: workaround for MosChip controller bug
This patch (as1489) works around a hardware bug in MosChip EHCI controllers. Evidently when one of these controllers increments the frame-index register, it changes the three low-order bits (the microframe counter) before changing the higher order bits (the frame counter). If the register is read at just the wrong time, the value obtained is too low by 8. When the appropriate quirk flag is set, we work around this problem by reading the frame-index register a second time if the first value's three low-order bits are all 0. This gives the hardware a chance to finish updating the register, yielding the correct value. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Jason N Pitt <jpitt@fhcrc.org> CC: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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