linux-kernel - [PATCH] x86: increase timeout for EHCI debug port reset completion in early printk

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Date:	Fri, 04 Sep 2009 09:13:49 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<yhlu.kernel@...il.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: increase timeout for EHCI debug port reset
	 completion in early printk

On one of my systems, several thousand iterations are needed before
CMD_RESET can be observed clear after setting it. Using a much higher
value here obviously cannot hurt.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/kernel/early_printk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.31-rc8/arch/x86/kernel/early_printk.c	2009-06-10 05:05:27.000000000 +0200
+++ 2.6.31-rc8-x86-earlyprintk-dbgp-reset/arch/x86/kernel/early_printk.c	2009-09-02 12:13:01.000000000 +0200
@@ -624,7 +624,7 @@ try_next_port:
 		return -1;
 	}
 
-	loop = 10;
+	loop = 100000;
 	/* Reset the EHCI controller */
 	cmd = readl(&ehci_regs->command);
 	cmd |= CMD_RESET;



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