From: Arnd Bergmann <arnd@arndb.de>
To: Greentime Hu <green.hu@gmail.com>
Cc: Greentime <greentime@andestech.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <marc.zyngier@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Networking <netdev@vger.kernel.org>,
Vincent Chen <deanbo422@gmail.com>,
DTML <devicetree@vger.kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>,
David Howells <dhowells@redhat.com>,
Will Deacon <will.deacon@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-serial@vger.kernel.org,
Geert Uytterhoeven <geert.uytterhoeven@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>,
Mark Rutland <mark.rutland@arm.com>, Greg KH <greg@kroah.com>,
Guo Ren <ren_guo@c-sky.co>
Subject: Re: [PATCH v6 06/36] nds32: Kernel booting and initialization
Date: Mon, 22 Jan 2018 10:53:07 +0100 [thread overview]
Message-ID: <CAK8P3a0Sz=O1j2t4ZnTY8X8C0Br68sTjNMTKrYQ--8s1OC5DBg@mail.gmail.com> (raw)
In-Reply-To: <CAEbi=3dF-ekx8oz0vjd3WfM7qO755rW46Q=+i-MnQC=4N1=EMA@mail.gmail.com>
On Mon, Jan 22, 2018 at 10:49 AM, Greentime Hu <green.hu@gmail.com> wrote:
> 2018-01-20 0:41 GMT+08:00 Arnd Bergmann <arnd@arndb.de>:
>>> This implementation is referenced from openrisc.
>>> https://lkml.org/lkml/2017/11/17/228
>>
>> It's correct on openrisc, because that has a reliable cycle counter,
>> and that gets used in its delay function:
>>
>> void __delay(unsigned long cycles)
>> {
>> cycles_t start = get_cycles();
>> while ((get_cycles() - start) < cycles)
>> cpu_relax();
>> }
>>
>> In my review comment that you cited, I assumed that nds32 had similar
>> hardware.
>>
>> However, as you explained earlier, the nds32 architecture does not provide
>> a cycle counter and the clocksource resolution is not high enough to
>> be a good replacement, so you have to use the traditional delay
>> calibration.
>>
>
> Hi, Arnd:
>
> Thank you for your explanation.
> Will it be ok if I code it like this?
>
> config GENERIC_CALIBRATE_DELAY
> def_bool y
Yes, I think that should be sufficient.
Arnd
next prev parent reply other threads:[~2018-01-22 9:53 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-15 5:53 [PATCH v6 00/36] Andes(nds32) Linux Kernel Port Greentime Hu
2018-01-15 5:53 ` [PATCH v6 01/36] asm-generic/io.h: move ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt out of ifndef CONFIG_MMU Greentime Hu
2018-01-15 5:53 ` [PATCH v6 02/36] openrisc: add ioremap_nocache declaration before include asm-generic/io.h and sync ioremap prototype with it Greentime Hu
2018-01-15 13:07 ` Stafford Horne
2018-01-15 13:28 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 03/36] sparc: io: To use the define of ioremap_[nocache|wc|wb] in asm-generic/io.h Greentime Hu
[not found] ` <790e05e9b9675b3f6ef41693a794d1f09795c151.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 9:56 ` Arnd Bergmann
[not found] ` <CAK8P3a2qx5pZmE-=QM5Bwrsib4XcfVac7RQr-QMzEseQ_oBPEA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 12:50 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 04/36] earlycon: add reg-offset to physical address before mapping Greentime Hu
2018-01-18 10:00 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 05/36] nds32: Assembly macros and definitions Greentime Hu
[not found] ` <d36e188c167392994a84c8f52ef0dab90b93ed8d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:01 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 06/36] nds32: Kernel booting and initialization Greentime Hu
2018-01-18 10:11 ` Arnd Bergmann
[not found] ` <CAK8P3a143yQ72+QGZSxpiFc7p8Hb7PXuCybJBFoLRSBaZ2uw4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 16:34 ` Greentime Hu
2018-01-19 16:41 ` Arnd Bergmann
[not found] ` <CAK8P3a3UCrMbTn1JMOGKCSV4WRw9T9tU+pey1t6Fzitf2V0Bvw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-22 9:49 ` Greentime Hu
2018-01-22 9:53 ` Arnd Bergmann [this message]
2018-01-15 5:53 ` [PATCH v6 07/36] nds32: Exception handling Greentime Hu
2018-01-18 10:14 ` Arnd Bergmann
[not found] ` <CAK8P3a1ZZsB7MVZ8sEPzkVcNUJh3-MB_ApmPi+DUF1rc9h8pXg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 10:53 ` Vincent Chen
2018-01-24 11:09 ` Arnd Bergmann
2018-01-24 11:10 ` Arnd Bergmann
2018-01-30 10:01 ` Vincent Chen
2018-01-30 13:33 ` Arnd Bergmann
2018-01-30 14:49 ` Greentime Hu
2018-01-30 15:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 09/36] nds32: MMU initialization Greentime Hu
2018-01-18 10:16 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 10/36] nds32: MMU fault handling and page table management Greentime Hu
2018-01-18 10:16 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 11/36] nds32: Cache and TLB routines Greentime Hu
[not found] ` <e1f55cfd5a5384967f1c4691bc766edbd06fee1d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:17 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 14/36] nds32: Atomic operations Greentime Hu
2018-01-18 10:23 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 15/36] nds32: Device specific operations Greentime Hu
2018-01-18 10:25 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 16/36] nds32: DMA mapping API Greentime Hu
2018-01-18 10:26 ` Arnd Bergmann
2018-01-23 8:23 ` Greentime Hu
[not found] ` <CAEbi=3cYynvFS2GDzj5Oav_5LtHPdBfBWh9c=mFT0PxeOLX9sQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 11:52 ` Greentime Hu
[not found] ` <CAEbi=3d46tXacnnU+RJGMw+KR1O=NaVjO+NW3cxUjAN==V51iw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 11:36 ` Arnd Bergmann
2018-01-25 3:45 ` Greentime Hu
2018-01-25 10:42 ` Arnd Bergmann
[not found] ` <CAK8P3a0YrwAXH8n83wf=34zmN44KgJu-JVXfQWhuquNxVmZ8Sw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-25 13:48 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 17/36] nds32: ELF definitions Greentime Hu
2018-01-18 10:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 19/36] nds32: VDSO support Greentime Hu
[not found] ` <4a602db0a58cc858515c3c669d5ac34c567b061c.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:28 ` Arnd Bergmann
2018-02-06 7:41 ` Vincent Chen
2018-02-06 8:48 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 20/36] nds32: Signal handling support Greentime Hu
2018-01-18 10:30 ` Arnd Bergmann
[not found] ` <CAK8P3a2HR6be9Fm+o1Oq-V5p51xEiuhbyqkgVWprD5BxuU29xQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 0:56 ` Vincent Chen
[not found] ` <CAJsyPhyGpJVQegd7ns9oZOjM=XsGVixCQaH9nT_jOQsSpyRs+g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 11:13 ` Arnd Bergmann
2018-02-06 6:39 ` Vincent Chen
2018-01-15 5:53 ` [PATCH v6 21/36] nds32: Library functions Greentime Hu
[not found] ` <6e8431d52d635f077ca49b2f1f7dd905bdf27a3c.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:31 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 22/36] nds32: Debugging support Greentime Hu
[not found] ` <65ae3b5b7eabe8680857b1821c72127f611c950b.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:37 ` Arnd Bergmann
[not found] ` <CAK8P3a2HKWHxmkcx5Lf3VFT6yErppXY+brmGr7k2KBLeXgvuFw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 7:28 ` Vincent Chen
2018-01-23 8:21 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 23/36] nds32: L2 cache support Greentime Hu
2018-01-18 10:37 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 24/36] nds32: Loadable modules Greentime Hu
2018-01-18 10:41 ` Arnd Bergmann
[not found] ` <CAK8P3a3pQSxM+gJ+dJsyeo5YnuOOyFYVoJdCVmnoHR0Numya5g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 14:26 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 25/36] nds32: Generic timers support Greentime Hu
[not found] ` <ff6346e073ae38aa96a031420f57aad3d1057ddf.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:41 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 26/36] nds32: Device tree support Greentime Hu
[not found] ` <623edb96d0a59433c25d71e5f6bb24a17804e960.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:43 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 27/36] nds32: Miscellaneous header files Greentime Hu
[not found] ` <38d9dce03a1421378a94d3d528bb0c4741e2bf7b.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:46 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 28/36] nds32: defconfig Greentime Hu
2018-01-18 10:44 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 29/36] nds32: Build infrastructure Greentime Hu
2018-01-18 11:00 ` Arnd Bergmann
2018-01-22 15:20 ` Greentime Hu
2018-01-22 15:38 ` Arnd Bergmann
2018-01-22 16:00 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 30/36] MAINTAINERS: Add nds32 Greentime Hu
2018-01-18 10:45 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 31/36] dt-bindings: nds32 CPU Bindings Greentime Hu
2018-01-18 11:02 ` Arnd Bergmann
2018-01-19 14:32 ` Greentime Hu
[not found] ` <CAEbi=3ef8JHf_Jpru1B2L3+Xz-Oz4p_t84Lh=5kuTFo0YEz=5A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 14:52 ` Arnd Bergmann
[not found] ` <CAK8P3a38hCHULZt=fGXJebcoiEGCwA0fre_kixA7sUpPP2xf5g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:18 ` Greentime Hu
[not found] ` <CAEbi=3eexCyrVhFZB8wmK1fT=QONzc63y6=dGNgj_H+Rt4zo_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:29 ` Geert Uytterhoeven
2018-01-19 15:35 ` Greentime Hu
[not found] ` <CAEbi=3fKp5tj32hoH=ZTo6kqpCE+Zv1LopnpVujusSfMkeaJKg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-19 15:37 ` Geert Uytterhoeven
2018-01-22 9:53 ` Greentime Hu
2018-01-22 11:15 ` Arnd Bergmann
2018-01-22 13:55 ` Greentime Hu
2018-01-15 5:53 ` [PATCH v6 32/36] dt-bindings: nds32 L2 cache controller Bindings Greentime Hu
2018-01-18 10:45 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 33/36] dt-bindings: nds32 SoC Bindings Greentime Hu
[not found] ` <b497b9429d9bc5208334b4c1abbaeb47d3eedf95.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 11:03 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 34/36] dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller Greentime Hu
[not found] ` <2cd18fba6e2ab78fc0eb50dd8d1216012f90c6d8.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:46 ` Arnd Bergmann
[not found] ` <cover.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-15 5:53 ` [PATCH v6 08/36] nds32: MMU definitions Greentime Hu
2018-01-18 10:14 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 12/36] nds32: Process management Greentime Hu
2018-01-18 10:22 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 13/36] nds32: IRQ handling Greentime Hu
2018-01-18 10:22 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 18/36] nds32: System calls handling Greentime Hu
[not found] ` <933f69aa93645513e06c6e87cc2dd48bc998343d.1515766253.git.green.hu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-18 10:27 ` Arnd Bergmann
2018-01-15 5:53 ` [PATCH v6 35/36] irqchip: Andestech Internal Vector Interrupt Controller driver Greentime Hu
2018-01-15 5:53 ` [PATCH v6 36/36] net: faraday add nds32 support Greentime Hu
2018-01-18 11:02 ` Arnd Bergmann
2018-01-18 9:49 ` [PATCH v6 00/36] Andes(nds32) Linux Kernel Port Arnd Bergmann
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