linux-kernel - Re: [PATCH] arm64: dts: msm8916: Move smem below hwlock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <56CCBE9B.5010209@linaro.org>
Date:	Tue, 23 Feb 2016 22:18:35 +0200
From:	Georgi Djakov <georgi.djakov@...aro.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	andy.gross@...aro.org
Cc:	Georgi Djakov <georgi.djakov@...aro.org>,
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: msm8916: Move smem below hwlock

On 23.02.16 г. 21:28, Srinivas Kandagatla wrote:
> 
> 
> On 23/02/16 18:47, Georgi Djakov wrote:
>> On 23.02.16 г. 19:29, Srinivas Kandagatla wrote:
>>>
>>>
>>> On 23/02/16 17:21, Georgi Djakov wrote:
>>>> When the SMEM is probed it defers as it depends on the hardware lock, which
>>>> is not available yet. But the SMD bus and RPM regulators and clocks depend
>>>> on SMEM and they defer too. The problem with this is that the order of
>>>> registering the devices is not optimal and also we may end with messed
>>>> up serial console as the RPM clocks are not registered yet..
>>> I noticed the same issue but was wondering why would we end up with messed up serial console?
>>>
>>> Could you add more details on why serial console is messed up?
>>>
>>> I thought, serial driver has nothing to do with the rpm clocks directly!
>>>
>>
>> If we don't have the rpm clocks registered, the uart clock is an orphan
>> and when clk_get_rate() is called on orphan clocks it returns 0 as rate.
> Shouldn't the actual uart clk provider registration fail/defer probe due to missing parent in this case?
> 

Yes, this is a known issue and people are currently working on it.
http://www.spinics.net/lists/linux-clk/msg00065.html
http://www.spinics.net/lists/arm-kernel/msg475910.html