linux-kernel - Re: [PATCH v3 0/5] rtc-at91rm9200: add shadow interrupt mask

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Date:	Fri, 31 May 2013 09:54:49 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	<dgilbert@...erlog.com>, Andrew Morton <akpm@...ux-foundation.org>
CC:	Robert Nelson <robertcnelson@...il.com>,
	Johan Hovold <jhovold@...il.com>,
	Robert Nelson <Robert.Nelson@...ikey.com>,
	<linux-kernel@...r.kernel.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/5] rtc-at91rm9200: add shadow interrupt mask

On 31/05/2013 01:17, Douglas Gilbert :
> On 13-05-30 03:36 PM, Andrew Morton wrote:
>> On Thu, 30 May 2013 09:50:27 +0200 Nicolas Ferre
>> <nicolas.ferre@...el.com> wrote:
>>
>>> The review of this patch series was in my TODO list for some time...
>>>
>>> Today, I magically took time to review it ;-)
>>> The patch series is good and I (even if it is too late) here is my:
>>>
>>> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
>>>
>>> I do not know if the series can be stacked for inclusion in 3.10-rc but
>>> the resolution of this bug can help a lot (as Douglas is saying in
>>> subsequent email...).
>>
>> We can do that, but looking through the discussion and changelogs I
>> can't seem to find a usable description of what impact the bug (and its
>> fix) have upon end-users.
>>
>> A nicely packaged description of that impact would help grease the
>> wheels, please.
>
> How about this:
>
> The members of Atmel's at91sam9x5 family (9x5) have
> a broken RTC interrupt mask register (AT91_RTC_IMR).
> It does not reflect enabled interrupts but instead
> always returns zero.
>
> The kernel's rtc-at91rm9200 driver handles the RTC
> for the 9x5 family. Currently when the date/time is
> set, an interrupt is generated and this driver neglects
> to handle the interrupt. The kernel complains about the
> un-handled interrupt and disables it henceforth. This
> not only breaks the RTC function, but since that
> interrupt is shared (Atmel's SYS interrupt) then other
> things break as well (e.g. the debug port no longer
> accepts characters).
>
> Tested on the at91sam9g25. Bug confirmed by Atmel.

Absolutely. Thank you Douglas for the detailed description.

>
> Edit as you please.
>
> Doug Gilbert
>
>


-- 
Nicolas Ferre
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