From: Sasha Levin <sashal@kernel.org>
To: gregkh@linuxfoundation.org
Cc: leonard.crestez@nxp.com, sboyd@kernel.org, shawnguo@kernel.org,
stable@vger.kernel.org
Subject: Re: FAILED: patch "[PATCH] clk: imx8m: Use SYS_PLL1_800M as intermediate parent of" failed to apply to 5.3-stable tree
Date: Mon, 11 Nov 2019 08:51:41 -0500 [thread overview]
Message-ID: <20191111135141.GC8496@sasha-vm> (raw)
In-Reply-To: <157345338112980@kroah.com>
On Mon, Nov 11, 2019 at 07:23:01AM +0100, gregkh@linuxfoundation.org wrote:
>
>The patch below does not apply to the 5.3-stable tree.
>If someone wants it applied there, or to any other stable or longterm
>tree, then please email the backport, including the original git commit
>id to <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From b234fe9558615098d8d62516e7041ad7f99ebcea Mon Sep 17 00:00:00 2001
>From: Leonard Crestez <leonard.crestez@nxp.com>
>Date: Tue, 22 Oct 2019 22:21:28 +0300
>Subject: [PATCH] clk: imx8m: Use SYS_PLL1_800M as intermediate parent of
> CLK_ARM
>
>During cpu frequency switching the main "CLK_ARM" is reparented to an
>intermediate "step" clock. On imx8mm and imx8mn the 24M oscillator is
>used for this purpose but it is extremely slow, increasing wakeup
>latencies to the point that i2c transactions can timeout and system
>becomes unresponsive.
>
>Fix by switching the "step" clk to SYS_PLL1_800M, matching the behavior
>of imx8m cpufreq drivers in imx vendor tree.
>
>This bug was not immediately apparent because upstream arm64 defconfig
>uses the "performance" governor by default so no cpufreq transitions
>happen.
>
>Fixes: ba5625c3e272 ("clk: imx: Add clock driver support for imx8mm")
>Fixes: 96d6392b54db ("clk: imx: Add support for i.MX8MN clock driver")
96d6392b54db doesn't exist on 5.3, so I've modified the patch to only
fix the ba5625c3e272 related code and queued it for 5.3. Neither commit
exists on 4.19 and older.
--
Thanks,
Sasha
next prev parent reply other threads:[~2019-11-11 13:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 6:23 FAILED: patch "[PATCH] clk: imx8m: Use SYS_PLL1_800M as intermediate parent of" failed to apply to 5.3-stable tree gregkh
2019-11-11 13:51 ` Sasha Levin [this message]
2019-11-11 14:21 ` Leonard Crestez
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