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[PATCH] amba-pl010: clear error flags on rx error
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>
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@ -129,6 +129,8 @@ static void pl010_rx_chars(struct uart_port *port)
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*/
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rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
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if (unlikely(rsr & UART01x_RSR_ANY)) {
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writel(0, port->membase + UART01x_ECR);
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if (rsr & UART01x_RSR_BE) {
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rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
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port->icount.brk++;
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