From: Sasha Levin <sashal@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
stable <stable@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH AUTOSEL 5.4 095/108] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs
Date: Fri, 17 Apr 2020 13:18:02 -0400 [thread overview]
Message-ID: <20200417171802.GV1068@sasha-vm> (raw)
In-Reply-To: <CAMuHMdVrp25m_SDKSC=ntNWxsumcw4JKvHNDeFZT_JnpfQmCxg@mail.gmail.com>
On Sun, Apr 12, 2020 at 10:44:01AM +0200, Geert Uytterhoeven wrote:
>Hi Sasha,
>
>On Sun, Apr 12, 2020 at 1:11 AM Sasha Levin <sashal@kernel.org> wrote:
>> From: Geert Uytterhoeven <geert+renesas@glider.be>
>>
>> [ Upstream commit 408324a3c5383716939eea8096a0f999a0665f7e ]
>>
>> SH-Mobile AG5 and R-Car H1 SoCs are based on the Cortex-A9 MPCore, which
>> includes a global timer.
>>
>> Enable the ARM global timer on these SoCs, which will be used for:
>> - the scheduler clock, improving scheduler accuracy from 10 ms to 3 or
>> 4 ns,
>> - delay loops, allowing removal of calls to shmobile_init_delay() from
>> the corresponding machine vectors.
>>
>> Note that when using an old DTB lacking the global timer, the kernel
>> will still work. However, loops-per-jiffies will no longer be preset,
>> and the delay loop will need to be calibrated during boot.
>
>I.e. to avoid this delay, this patch is best backported after backporting
>8443ffd1bbd5be74 ("ARM: dts: r8a7779: Add device node for ARM global timer"),
>df1a0aac0a533e6f ("ARM: dts: sh73a0: Add device node for ARM global timer").
>
>While the former has been backported to v5.[45]-stable, the latter hasn't,
>probably because it depends on
>61b58e3f6e518c51 ("ARM: dts: sh73a0: Rename twd clock to periph clock")
>
>So please backport the last two commits first.
Done, thanks!
--
Thanks,
Sasha
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next prev parent reply other threads:[~2020-04-17 17:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200411230943.24951-1-sashal@kernel.org>
2020-04-11 23:07 ` [PATCH AUTOSEL 5.4 003/108] net: axienet: Convert DMA error handler to a work queue Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 006/108] mmc: sdhci-esdhc-imx: restore pin state when resume back Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 042/108] drm/sun4i: dsi: Use NULL to signify "no panel" Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 043/108] mt76: fix handling full tx queues in mt76_dma_tx_queue_skb_raw Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 051/108] drm/stm: ltdc: check crtc state before enabling LIE Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 058/108] ASoC: mediatek: mt8183-da7219: pull TDM GPIO pins down when probed Sasha Levin
2020-04-11 23:08 ` [PATCH AUTOSEL 5.4 060/108] mt76: mt7603: fix input validation issues for powersave-filtered frames Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 076/108] net: axienet: Propagate failure of DMA descriptor setup Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 085/108] ASoC: stm32: spdifrx: fix regmap status check Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 090/108] dmaengine: stm32-dma: use reset controller only at probe time Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 094/108] scsi: ufs: Fix ufshcd_hold() caused scheduling while atomic Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 095/108] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs Sasha Levin
2020-04-12 8:44 ` Geert Uytterhoeven
2020-04-17 17:18 ` Sasha Levin [this message]
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 098/108] arm64: dts: g12-common: add parkmode_disable_ss_quirk on DWC3 controller Sasha Levin
2020-04-11 23:09 ` [PATCH AUTOSEL 5.4 107/108] rtc: imx-sc: Align imx sc msg structs to 4 Sasha Levin
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