The patch titled
amba-pl010: clear error flags on rx error
has been removed from the -mm tree. Its filename was
amba-pl010-clear-error-flags-on-rx-error.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: amba-pl010: clear error flags on rx error
From: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/serial/amba-pl010.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN drivers/serial/amba-pl010.c~amba-pl010-clear-error-flags-on-rx-error drivers/serial/amba-pl010.c
--- a/drivers/serial/amba-pl010.c~amba-pl010-clear-error-flags-on-rx-error
+++ a/drivers/serial/amba-pl010.c
@@ -129,6 +129,8 @@ static void pl010_rx_chars(struct uart_p
*/
rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
if (unlikely(rsr & UART01x_RSR_ANY)) {
+ writel(0, port->membase + UART01x_ECR);
+
if (rsr & UART01x_RSR_BE) {
rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
port->icount.brk++;
_
Patches currently in -mm which might be from buytenh@xxxxxxxxxxxxxx are
origin.patch
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