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Add some delay to avoid reading CSR TXCOUNT too early after updating it. For more info about this HW glitch see: http://lists.arm.linux.org.uk/lurker/message/20090325.150843.f515c02f.en.html http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100129/10ba0f8b/attachment.el http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/09cdb3b4/attachment.el http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20100203/08b5b249/attachment.el First applied: "Fix soft lockup in at91 udc driver" http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=5965 Signed-off-by: Anti Sullin <anti.sullin@artecdesign.ee> Signed-off-by: Harro Haan <hrhaan@gmail.com> Acked-by: Remy Bohmer <linux@bohmer.net> Acked-by: Andrew Victor <linux@maxim.org.za> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>