linux-kernel - Re: [PATCH v5 0/8] clocksource: Fix MIPS GIC and DW APB Timer for Baikal-T1 SoC support

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]

Date:   Fri, 22 May 2020 17:28:42 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Maxim Kaurkin <Maxim.Kaurkin@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Ekaterina Skachko <Ekaterina.Skachko@...kalelectronics.ru>,
        Vadim Vlasov <V.Vlasov@...kalelectronics.ru>,
        Alexey Kolotnikov <Alexey.Kolotnikov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/8] clocksource: Fix MIPS GIC and DW APB Timer for
 Baikal-T1 SoC support

On 21/05/2020 22:48, Serge Semin wrote:
> As for all Baikal-T1 SoC related patchsets, which need this, we replaced
> the DW APB Timer legacy plain text-based dt-binding file with DT schema.
> Similarly the MIPS GIC bindings file is also converted to DT schema seeing
> it also defines the MIPS GIC Timer binding.
> 
> Aside from MIPS-specific r4k timer Baikal-T1 chip also provides a
> functionality of two another timers: embedded into the MIPS GIC timer and
> three external DW timers available over APB bus. But we can't use them
> before the corresponding drivers are properly fixed. First of all DW APB
> Timer shouldn't be bound to a single CPU, since as being accessible over
> APB they are external with respect to all possible CPUs. Secondly there
> might be more than just two DW APB Timers in the system (Baikal-T1 has
> three of them), so permit the driver to use one of them as a clocksource
> and the rest - for clockevents. Thirdly it's possible to use MIPS GIC
> timer as a clocksource so register it in the corresponding subsystem
> (the patch has been found in the Paul Burton MIPS repo so I left the
> original Signed-off-by attribute). Finally in the same way as r4k timer
> the MIPS GIC timer should be used with care when CPUFREQ config is enabled
> since in case of CM2 the timer counting depends on the CPU reference clock
> frequency while the clocksource subsystem currently doesn't support the
> timers with non-stable clock.
> 
> This patchset is rebased and tested on the mainline Linux kernel 5.7-rc4:
> base-commit: 0e698dfa2822 ("Linux 5.7-rc4")
> tag: v5.7-rc4

Applied patch 1,2,4,5,6,7,8

Thanks!

  -- Daniel


-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog