From: Matthew McClintock <mmcclint@codeaurora.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Stephen Boyd <sboyd@codeaurora.org>,
andy.gross@linaro.org, linux-arm-msm@vger.kernel.org,
qca-upstream.external@qca.qualcomm.com,
Wim Van Sebroeck <wim@iguana.be>,
"open list:WATCHDOG DEVICE DRIVERS"
<linux-watchdog@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 08/17] watchdog: qcom: configure BARK time in addition to BITE time
Date: Thu, 24 Mar 2016 14:49:33 -0500 [thread overview]
Message-ID: <7B88A165-5D16-4545-85ED-798CA38CF927@codeaurora.org> (raw)
In-Reply-To: <20160324161754.GA6515@roeck-us.net>
On Mar 24, 2016, at 11:17 AM, Guenter Roeck <linux@roeck-us.net> wrote:
>
>>> Why isn't TZ configuring the bark time to what it wants? I'm lost
>>> why we have to do this for them.
>>
>> So it was done like this to ensure we had a valid upgrade. The bootloader is using the watchdog to ensure the system is bootable and if not it will revert back to the working images.
>>
>> Bottom line is, for some versions of TZ out there, if we enable watchdog coming out of boot the bark time is already configured by the boot loader and TZ is configured to intercept this interrupt and do some register saving (for crashdump) and we end up getting a watchdog reset during boot.
>>
>> It’s even a little more complex, because in order for the TZ to save the registers you need to pad the BITE time a bit higher than the BARK time, but I was leaving that for another day.
>>
> Sounds like an op[timal target for using pretimeout ?
So the bark is basically a pretimeout, sure I think that will work. We can configure it to be off by default.
Thanks for the heads up, I’ll take a look.
-M--
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next prev parent reply other threads:[~2016-03-24 19:49 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-23 22:04 [PATCH 00/17] Additional IPQ4019 platform support Matthew McClintock
2016-03-23 22:04 ` [PATCH 01/17] pinctrl: qcom: ipq4019: set ngpios to correct value Matthew McClintock
2016-03-25 21:19 ` Bjorn Andersson
2016-03-31 9:53 ` Linus Walleij
2016-03-23 22:04 ` [PATCH 02/17] pinctrl: qcom: ipq4019: fix the function enum for gpio mode Matthew McClintock
2016-03-25 21:22 ` Bjorn Andersson
2016-03-31 9:55 ` Linus Walleij
2016-03-23 22:04 ` [PATCH 03/17] pinctrl: qcom: ipq4019: fix register offsets Matthew McClintock
2016-03-25 21:31 ` Bjorn Andersson
2016-03-31 9:57 ` Linus Walleij
2016-03-23 22:04 ` [PATCH 04/17] clk: qcom: ipq4019: switch remaining defines to enums Matthew McClintock
2016-03-29 23:31 ` Stephen Boyd
2016-03-23 22:05 ` [PATCH 05/17] clk: qcom: ipq4019: add some fixed clocks for ddrppl and fepll Matthew McClintock
2016-03-29 23:31 ` Stephen Boyd
[not found] ` <1458770712-10880-1-git-send-email-mmcclint-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-23 22:05 ` [PATCH 06/17] watchdog: qcom: update device tree bindings Matthew McClintock
2016-03-23 22:26 ` Stephen Boyd
2016-03-24 15:49 ` Matthew McClintock
[not found] ` <1458770712-10880-7-git-send-email-mmcclint-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-25 14:13 ` Rob Herring
2016-03-23 22:05 ` [PATCH 09/17] watchdog: qcom: add kpss-standalone to device tree binding Matthew McClintock
2016-03-25 14:15 ` Rob Herring
2016-03-28 17:02 ` Matthew McClintock
2016-03-28 17:26 ` Rob Herring
2016-03-28 18:15 ` Guenter Roeck
[not found] ` <20160328181544.GB29820-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2016-03-28 22:22 ` Matthew McClintock
2016-03-23 22:05 ` [PATCH 15/17] qcom: ipq4019: add cpu operating points for cpufreq support Matthew McClintock
[not found] ` <1458770712-10880-16-git-send-email-mmcclint-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-23 22:33 ` Stephen Boyd
2017-03-22 14:10 ` [15/17] " Sven Eckelmann
2016-03-23 22:05 ` [PATCH 07/17] watchdog: qcom: add option for standalone watchdog not in timer block Matthew McClintock
[not found] ` <1458770712-10880-8-git-send-email-mmcclint-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-23 22:40 ` Stephen Boyd
2016-03-25 16:23 ` Guenter Roeck
[not found] ` <20160325162326.GA25767-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2016-03-28 16:55 ` Matthew McClintock
[not found] ` <D54FA5B6-F170-40D3-BF0D-60D40A2C2829-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-28 18:13 ` Guenter Roeck
2016-03-28 20:40 ` Matthew McClintock
2016-03-28 21:56 ` Guenter Roeck
[not found] ` <20160328215638.GA25221-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2016-03-28 22:21 ` Matthew McClintock
2016-03-23 22:05 ` [PATCH 08/17] watchdog: qcom: configure BARK time in addition to BITE time Matthew McClintock
[not found] ` <1458770712-10880-9-git-send-email-mmcclint-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-23 22:42 ` Stephen Boyd
2016-03-24 15:46 ` Matthew McClintock
2016-03-24 16:17 ` Guenter Roeck
2016-03-24 19:49 ` Matthew McClintock [this message]
2016-04-07 7:02 ` Guenter Roeck
2016-03-23 22:05 ` [PATCH 10/17] qcom: ipq4019: add watchdog node to ipq4019 SoC and DK01 device tree Matthew McClintock
2016-03-23 22:05 ` [PATCH 11/17] qcom: ipq4019: add support for reset via qcom,ps-hold Matthew McClintock
2016-03-23 22:05 ` [PATCH 12/17] qcom: ipq4019: add spi node to ipq4019 SoC and DK01 device tree Matthew McClintock
2016-03-23 22:05 ` [PATCH 13/17] qcom: ipq4019: add i2c " Matthew McClintock
2016-03-23 22:05 ` [PATCH 14/17] cpufreq: ipq4019: add cpufreq driver Matthew McClintock
2016-03-24 6:44 ` Viresh Kumar
2016-03-24 15:42 ` Matthew McClintock
2016-03-23 22:05 ` [PATCH 16/17] qcom: ipq4019: add crypto nodes to ipq4019 SoC and DK01 device tree Matthew McClintock
2016-03-23 22:05 ` [PATCH 17/17] qcom: ipq4019: add DMA " Matthew McClintock
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