linux-kernel - [RESEND] [PATCH] Input: add retry logic to resume with respect to CTR

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Date:	Thu, 12 Jun 2008 15:12:34 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RESEND] [PATCH] Input: add retry logic to resume with respect to
 CTR

There are systems that fail in i8042_resume() with

	i8042: Can't write CTR to resume

as i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR) fails even though the
controller claimed itself to be ready before.

One retry after failing write fixes the problems on the failing systems.

Reported-by: Helmut Schaa <hschaa@...ell.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---
 drivers/input/serio/i8042.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- linux-2.6.25.orig/drivers/input/serio/i8042.c
+++ linux-2.6.25/drivers/input/serio/i8042.c
@@ -938,8 +938,12 @@ static int i8042_resume(struct platform_
 	i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
 	i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
 	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
-		printk(KERN_ERR "i8042: Can't write CTR to resume\n");
-		return -EIO;
+		printk(KERN_WARNING "i8042: Can't write CTR to resume, retrying ...\n");
+		msleep(50);
+		if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+			printk(KERN_ERR "i8042: CTR write retry failed\n");
+			return -EIO;
+		}
 	}
 
 	if (i8042_mux_present) {

--
1.5.2.4

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