linux-kernel - Re: [1/2] RTC: Add core rtc support for Gemini Soc devices

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Date:	Thu, 09 Jul 2015 01:29:39 +0300
From:	Roman Yeryomin <roman@...em.lv>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Felix Fietkau <nbd@...nwrt.org>, rtc-linux@...glegroups.com,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Hans Ulli Kroll <ulli.kroll@...glemail.com>
Subject: Re: [1/2] RTC: Add core rtc support for Gemini Soc devices

On 2015-05-08 19:08, Arnd Bergmann wrote:
> On Thursday 07 May 2015 12:03:25 Roman Yeryomin wrote:
>> On 2015-05-06 22:22, Arnd Bergmann wrote:
>> > On Wednesday 06 May 2015 19:21:21 Roman Yeryomin wrote:
>> >>
>> >> > Thanks to point that, I'll merge that one which seems clean enough:
>> >> > http://git.openwrt.org/?p=openwrt.git;a=blob;f=target/linux/gemini/files/drivers/rtc/rtc-gemini.c;h=587d8122b2fbb1230437eadcce4789a53aa60ee5;hb=4c637410a2a1ab45988e8ca6202554a502102039
>> >>
>> >> For 3.18 (and up) to work on gemini 160-gemini-timers.patch is vital.
>> >> Without that timers are broken and cpu is super slow.
>> >
>> > Do you know what part of the patch is the actual bug fix? We should
>> > probably
>> > merge that separately and mark it for stable backports, while the bulk
>> > of that
>> > patch seems to just rearrange code.
>> >
>> >       Arnd
>> 
>> Sorry, didn't try to extract the exact lines it but I guess it's that
>> part which touches the scheduler clock code.
>> Because without that patch sched clock runs at 100Hz instead of 25MHz.
>> I can dive into this deeper if you want, I just didn't see the need.
> 
> I think that would be helpful, yes.
> 

OK, here are the minimal changes required (see attachment). Tested on 
4.1.1
Let me know if you want me to submit it in some other way.

Regards,
Roman
View attachment "160-gemini-timers.patch" of type "text/x-diff" (1986 bytes)