* [PATCH] arm64: dts: meson: remove CPU opps below 1GHz for G12A boards
@ 2023-01-19 5:30 Christian Hewitt
2023-01-19 7:59 ` Neil Armstrong
0 siblings, 1 reply; 2+ messages in thread
From: Christian Hewitt @ 2023-01-19 5:30 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Neil Armstrong, Kevin Hilman,
Jerome Brunet, Martin Blumenstingl, devicetree, linux-arm-kernel,
linux-amlogic, linux-kernel
Amlogic G12A devices experience CPU stalls and random board wedges when
the system idles and CPU cores clock down to lower opp points. Recent
vendor kernels include a change to remove 100-250MHz and other distro
sources also remove the 500/667MHz points. Unless all 100-667Mhz opps
are removed or the CPU governor forced to performance stalls are still
observed, so let's remove them to improve stability and uptime.
Fixes: b190056fa9ee ("arm64: dts: meson-g12a: add cpus OPP table")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
---
It seems we (me) forgot about G12A when pushing changes to remove opp
points from G12B and SM1 boards in [0] and [1].
[0] https://github.com/torvalds/linux/commit/6c4d636bc00dc17c63ffb2a73a0da850240e26e3
[1] https://github.com/torvalds/linux/commit/fd86d85401c2049f652293877c0f7e6e5afc3bbc
arch/arm64/boot/dts/amlogic/meson-g12a.dtsi | 20 --------------------
1 file changed, 20 deletions(-)
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
index fb0ab27d1f64..6eaceb717d61 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
@@ -57,26 +57,6 @@ cpu_opp_table: opp-table {
compatible = "operating-points-v2";
opp-shared;
- opp-100000000 {
- opp-hz = /bits/ 64 <100000000>;
- opp-microvolt = <731000>;
- };
-
- opp-250000000 {
- opp-hz = /bits/ 64 <250000000>;
- opp-microvolt = <731000>;
- };
-
- opp-500000000 {
- opp-hz = /bits/ 64 <500000000>;
- opp-microvolt = <731000>;
- };
-
- opp-667000000 {
- opp-hz = /bits/ 64 <666666666>;
- opp-microvolt = <731000>;
- };
-
opp-1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <731000>;
--
2.34.1
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] arm64: dts: meson: remove CPU opps below 1GHz for G12A boards
2023-01-19 5:30 [PATCH] arm64: dts: meson: remove CPU opps below 1GHz for G12A boards Christian Hewitt
@ 2023-01-19 7:59 ` Neil Armstrong
0 siblings, 0 replies; 2+ messages in thread
From: Neil Armstrong @ 2023-01-19 7:59 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Kevin Hilman, Jerome Brunet,
Martin Blumenstingl, devicetree, linux-arm-kernel, linux-amlogic,
linux-kernel, Christian Hewitt
Hi,
On Thu, 19 Jan 2023 05:30:31 +0000, Christian Hewitt wrote:
> Amlogic G12A devices experience CPU stalls and random board wedges when
> the system idles and CPU cores clock down to lower opp points. Recent
> vendor kernels include a change to remove 100-250MHz and other distro
> sources also remove the 500/667MHz points. Unless all 100-667Mhz opps
> are removed or the CPU governor forced to performance stalls are still
> observed, so let's remove them to improve stability and uptime.
>
> [...]
Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v6.3/arm64-dt)
[1/1] arm64: dts: meson: remove CPU opps below 1GHz for G12A boards
https://git.kernel.org/amlogic/c/3cbd431c2b34d84605d358c8c57654193fd661fb
These changes has been applied on the intermediate git tree [1].
The v6.3/arm64-dt branch will then be sent via a formal Pull Request to the Linux SoC maintainers
for inclusion in their intermediate git branches in order to be sent to Linus during
the next merge window, or sooner if it's a set of fixes.
In the cases of fixes, those will be merged in the current release candidate
kernel and as soon they appear on the Linux master branch they will be
backported to the previous Stable and Long-Stable kernels [2].
The intermediate git branches are merged daily in the linux-next tree [3],
people are encouraged testing these pre-release kernels and report issues on the
relevant mailing-lists.
If problems are discovered on those changes, please submit a signed-off-by revert
patch followed by a corrective changeset.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
--
Neil
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