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The pl010 primecell documentation specifies that an error indicated via RSR should be cleared by a write to ECR. We didn't do this, which was causing errors to be re-reported on every call to pl010_rx_chars(). Doing a write to ECR once we detect an error appears to prevent the ep93xx console UART driver from going into a mode where it reports "ttyAM0: X input overrun(s)" every couple of keystrokes. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>