linux-kernel - Re: [PATCH 3/6] clk: samsung: exynos4: Remove SRC_MASK

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: <53AAA02A.1090601@samsung.com>
Date:	Wed, 25 Jun 2014 12:10:50 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Daniel Drake <drake@...lessm.com>
Cc:	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Mike Turquette <mturquette@...aro.org>
Subject: Re: [PATCH 3/6] clk: samsung: exynos4: Remove SRC_MASK_ISP gates

Hi Daniel,

On 25.06.2014 11:58, Daniel Drake wrote:
> Hi Tomasz,
> 
> On Tue, Jun 24, 2014 at 2:57 PM, Tomasz Figa <t.figa@...sung.com> wrote:
>> ISP special clocks have dedicated gating registers and so MUX SRC_MASK
>> register should not be used. This patch fixes the problem of
>> Exynos4x12-based boards freezing on system suspend, because those
>> mux outputs need not to be masked while suspending.
> 
> Not sure if you will be interested in this, as your plate must be
> pretty full already, and I am probably the first person to try
> suspend/resume on ODROID, but:
> 
> ODROID-U2 fails to suspend/resume. I am testing with rtcwake, trying
> to raise a wakeup alarm on the internal Exynos4412 RTC. For this,
> CONFIG_COMMON_CLK_MAX77686 must be disabled (otherwise it disables the
> upstream 32KHz clock source for the RTC), I also have
> CONFIG_RTC_DRV_MAX77686 disabled so that there is only one RTC to
> worry about.
> 
> Then:
>  rtcwake --utc -m mem -s 10 -v
> 
> Before this patch, it would totally hang after calling cpu_suspend()
> (checked with S3C_PMDBG) - not sure if it hangs before sleeping, or if
> it sleeps but simply fails to wake up.
> 
> With this patch, now it seems like the RTC alarm does wake up the
> system after the desired time, however it immediately goes back into
> uboot rather than resuming into Linux. So this patch does make some
> progress at least.
> 
> The power light is on at all times during these tests (not sure if
> that means anything, but I was wondering if it should go out when the
> system suspends).

As far as I'm aware of, all Exynos4412-based ODROIDs run secure
firmware, which needs special handling of suspend/resume. I already have
a series to address this, but there is one more issue that I'd like to
fix, until I send it. The patches should hit the ML this week, though.

Best regards,
Tomasz
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/