From: Arjan van de Ven <arjan@linux.intel.com>
To: Larry Finger <Larry.Finger@lwfinger.net>,
LKML <linux-kernel@vger.kernel.org>,
Li Aubrey <aubrey.li@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>
Cc: Porteus Kiosk <porteus.kiosk@gmail.com>,
Bastien Nocera <hadess@hadess.net>,
Avi Weiss <aviw@benchmarkmerchantsolutions.com>,
Benny Silberstein <bennys@benchmarkmerchantsolutions.com>
Subject: Re: V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341
Date: Sat, 11 Jul 2015 11:22:33 -0700 [thread overview]
Message-ID: <55A15EE9.3010102@linux.intel.com> (raw)
In-Reply-To: <55A15E93.8070706@linux.intel.com>
On 7/11/2015 11:21 AM, Arjan van de Ven wrote:
> On 7/11/2015 10:59 AM, Larry Finger wrote:
>> On a Winbook TW100 BayTrail tablet, kernel 4.0 and later do not create /dev/rtc0 when CONFIG_PINCTRL_BAYTRAIL is set in the configuration. Removing this option from the
>> config creates a real-time clock; however, it is no longer possible to get the tablet to sleep using the power button. Only complete shutdown works.
>>
>> This problem was bisected to the following commit:
>
> in "hardware reduced mode" (e.g. tablets) on Baytrail the RTC is not actually enabled/initialized by the firmware; talking to it may appear to work but it's really not
> a good idea (and breaks things likes suspend/resume etc).
(or in other words, many of the legacy PC things are not supposed to be there)
what did you want to use rtc0 for?
next prev parent reply other threads:[~2015-07-11 18:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-11 17:59 V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341 Larry Finger
2015-07-11 18:21 ` Arjan van de Ven
2015-07-11 18:22 ` Arjan van de Ven [this message]
[not found] ` <CANC45uWh5-jYLqoFgvfynC0n7t31fae1gp2DUn-bwky24trAPg@mail.gmail.com>
2015-07-11 18:35 ` Arjan van de Ven
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