linux-kernel - Re: [PATCH 3/3] 8250: add workaround for MPC8[356]xx UART break IRQ storm

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Date:	Thu, 1 Dec 2011 17:51:00 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	<gregkh@...e.de>, <alan@...ux.intel.com>,
	<galak@...nel.crashing.org>, <linux-serial@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] 8250: add workaround for MPC8[356]xx UART break IRQ
 storm

On 12/01/2011 05:47 PM, Paul Gortmaker wrote:
> diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
> index 8c660af..b0f4042 100644
> --- a/include/linux/serial_8250.h
> +++ b/include/linux/serial_8250.h
> @@ -18,6 +18,11 @@
>  #define UART_BUG_TXEN	(1 << 1)	/* buggy TX IIR status */
>  #define UART_BUG_NOMSR	(1 << 2)	/* buggy MSR status bits (Au1x00) */
>  #define UART_BUG_THRE	(1 << 3)	/* buggy THRE reassertion */
> +#ifdef CONFIG_PPC32
> +#define UART_BUG_FSLBK	(1 << 4)	/* buggy FSL break IRQ storm */
> +#else	/* help GCC optimize away IRQ handler errata code for ARCH != PPC32 */
> +#define UART_BUG_FSLBK	0
> +#endif

I believe this bug still exists on our 64-bit chips.

-Scott

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