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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Chanho Min <chanho0207@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>,
	Alan Cox <alan@linux.intel.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>,
	"Kim, Jong-Sung" <neidhard.kim@lge.com>,
	linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [PATCH] Clear previous interrupts after fifo is disabled
Date: Thu, 8 Mar 2012 10:49:54 -0800	[thread overview]
Message-ID: <20120308184954.GA1275@kroah.com> (raw)
In-Reply-To: <CAOAMb1ASB0zznSSOAU9HgPNW2e=Do+8hSJ6JZ00DxtAxqsXyXQ@mail.gmail.com>

On Mon, Feb 27, 2012 at 06:30:20PM +0900, Chanho Min wrote:
> This is another workaroud of  'https://lkml.org/lkml/2012/1/17/104'
> with additional analysis.Bootloader can transfer control to kernel and
> there are some pending interrupts. In this case, RXFE of the flag
> register is set by clearing FEN(LCRH) even if rx data remains in the
> fifo. It seems that the fifo's status is initiailized. Interrupt
> handler can not get any data from data register because of the below
> break condtion.
> 
> pl011_fifo_to_tty
>  while (max_count--) {
>    if (status & UART01x_FR_RXFE)
> 	break;

This patch never seemed to be agreed on, so I'm not taking it.

Can someone, if this is still needed, and everyone agrees on how to
solve it, please send me the needed fix?

thanks,

greg k-h

  parent reply	other threads:[~2012-03-08 18:50 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-27  9:30 [PATCH] Clear previous interrupts after fifo is disabled Chanho Min
2012-02-27 10:45 ` Linus Walleij
2012-02-27 10:45   ` Linus Walleij
2012-02-27 10:48 ` Russell King - ARM Linux
2012-02-27 11:02   ` Russell King - ARM Linux
2012-02-27 13:54     ` Linus Walleij
2012-02-28  1:35     ` Chanho Min
2012-02-28  8:35       ` Russell King - ARM Linux
2012-02-28  8:35         ` Russell King - ARM Linux
2012-02-28  9:16         ` Chanho Min
2012-02-28  9:16           ` Chanho Min
2012-02-28  9:21           ` Russell King - ARM Linux
2012-02-28  9:46             ` Chanho Min
2012-02-28 10:23               ` Russell King - ARM Linux
2012-02-29  2:47                 ` Chanho Min
2012-02-29  2:47                   ` Chanho Min
2012-03-08  9:02 ` Kim, Jong-Sung
2012-03-08  9:02   ` Kim, Jong-Sung
2012-03-08 18:49 ` Greg Kroah-Hartman [this message]
2012-03-09 16:34   ` Linus Walleij
2012-03-09 16:34     ` Linus Walleij
2012-03-09 16:37     ` Greg Kroah-Hartman
2012-03-09 16:37       ` Greg Kroah-Hartman
2012-03-10  2:14       ` Chanho Min
2012-03-12  1:24         ` Kim, Jong-Sung
2012-03-12  1:24           ` Kim, Jong-Sung
2012-03-12  8:29   ` Linus Walleij

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