From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc: macro@orcam.me.uk, linux-kernel@vger.kernel.org,
linux-mips@vger.kernel.org, liwei391@huawei.com, nbd@nbd.name,
yangtiezhu@loongson.cn
Subject: Re: [PATCH v3] MIPS: add support for buggy MT7621S core detection
Date: Mon, 12 Apr 2021 17:03:24 +0200 [thread overview]
Message-ID: <20210412150324.GA23632@alpha.franken.de> (raw)
In-Reply-To: <20210407200738.149207-1-ilya.lipnitskiy@gmail.com>
On Wed, Apr 07, 2021 at 01:07:38PM -0700, Ilya Lipnitskiy wrote:
> Most MT7621 SoCs have 2 cores, which is detected and supported properly
> by CPS.
>
> Unfortunately, MT7621 SoC has a less common S variant with only one core.
> On MT7621S, GCR_CONFIG still reports 2 cores, which leads to hangs when
> starting SMP. CPULAUNCH registers can be used in that case to detect the
> absence of the second core and override the GCR_CONFIG PCORES field.
>
> Rework a long-standing OpenWrt patch to override the value of
> mips_cps_numcores on single-core MT7621 systems.
>
> Tested on a dual-core MT7621 device (Ubiquiti ER-X) and a single-core
> MT7621 device (Netgear R6220).
>
> Original 4.14 OpenWrt patch:
> Link: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=4cdbc90a376dd0555201c1434a2081e055e9ceb7
> Current 5.10 OpenWrt patch:
> Link: https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/ramips/patches-5.10/320-mt7621-core-detect-hack.patch;h=c63f0f4c1ec742e24d8480e80553863744b58f6a;hb=10267e17299806f9885d086147878f6c492cb904
>
> Suggested-by: Felix Fietkau <nbd@nbd.name>
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
> ---
> arch/mips/include/asm/mips-cps.h | 23 ++++++++++++++++++++++-
> 1 file changed, 22 insertions(+), 1 deletion(-)
applied to mips-next.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
next prev parent reply other threads:[~2021-04-12 15:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-03 6:19 [PATCH] MIPS: add support for buggy MT7621S core detection Ilya Lipnitskiy
2021-04-06 1:22 ` Maciej W. Rozycki
2021-04-06 1:54 ` Ilya Lipnitskiy
2021-04-07 13:49 ` Maciej W. Rozycki
2021-04-07 18:49 ` Ilya Lipnitskiy
2021-06-25 10:54 ` Strontium
2021-04-06 4:23 ` [PATCH v2] " Ilya Lipnitskiy
2021-04-07 13:52 ` Maciej W. Rozycki
2021-04-07 20:07 ` [PATCH v3] " Ilya Lipnitskiy
2021-04-12 15:03 ` Thomas Bogendoerfer [this message]
2021-09-16 2:56 Greg Ungerer
2021-09-16 6:33 ` Sergio Paracuellos
2021-09-16 6:54 ` Greg Ungerer
2021-09-16 8:54 ` Strontium
2021-09-30 12:41 ` Greg Ungerer
2021-09-30 13:35 ` Sergio Paracuellos
2021-09-30 16:41 ` Ilya Lipnitskiy
2021-09-30 22:36 ` Greg Ungerer
[not found] ` <d1eb4cb4-6e9e-3f3c-8ca7-a84d03bb9f53@gmail.com>
2021-10-01 5:04 ` Sergio Paracuellos
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