This is a note to let you know that I've just added the patch titled
i2c: omap: Clear ARDY bit twice
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-omap-clear-ardy-bit-twice.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4cdbf7d346e7461c3b93a26707c852e2c9db3753 Mon Sep 17 00:00:00 2001
From: Taras Kondratiuk <taras.kondratiuk@xxxxxxxxxx>
Date: Mon, 7 Oct 2013 13:41:59 +0300
Subject: i2c: omap: Clear ARDY bit twice
From: Taras Kondratiuk <taras.kondratiuk@xxxxxxxxxx>
commit 4cdbf7d346e7461c3b93a26707c852e2c9db3753 upstream.
Initially commit cb527ede1bf6ff2008a025606f25344b8ed7b4ac
"i2c-omap: Double clear of ARDY status in IRQ handler"
added a workaround for undocumented errata ProDB0017052.
But then commit 1d7afc95946487945cc7f5019b41255b72224b70
"i2c: omap: ack IRQ in parts" refactored code and missed
one of ARDY clearings. So current code violates errata.
It causes often i2c bus timeouts on my Pandaboard.
This patch adds a second clearing in place.
Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-omap.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -944,6 +944,9 @@ omap_i2c_isr_thread(int this_irq, void *
/*
* ProDB0017052: Clear ARDY bit twice
*/
+ if (stat & OMAP_I2C_STAT_ARDY)
+ omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ARDY);
+
if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
OMAP_I2C_STAT_AL)) {
omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY |
Patches currently in stable-queue which might be from taras.kondratiuk@xxxxxxxxxx are
queue-3.11/i2c-omap-clear-ardy-bit-twice.patch
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