From: Lennert Buytenhek <buytenh@wantstofly.org>
Date: Thu, 7 Dec 2006 04:39:57 +0000 (-0800)
Subject: [PATCH] amba-pl010: clear error flags on rx error
X-Git-Tag: v2.6.20-rc1~145^2^2~72
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a4ed06ad83acc3b7dafc018bc0b27469e787e27d;p=pandora-kernel.git

[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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