arm64: dts: meson: remove CPU opps below 1GHz for SM1 boards

BugLink: https://bugs.launchpad.net/bugs/1978234
[ Upstream commit fd86d85401c2049f652293877c0f7e6e5afc3bbc ]

Amlogic SM1 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: 3d9e76483049 ("arm64: dts: meson-sm1-sei610: enable DVFS")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220210100638.19130-3-christianshewitt@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi
index 3d8b1f4f2001b2e92c0a4ea1c73a3b789443fc51..78bdbd2ccc9def9604e8fb1ac088d94e149b6741 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi
@@ -95,26 +95,6 @@
                compatible = "operating-points-v2";
                opp-shared;
 
-               opp-100000000 {
-                       opp-hz = /bits/ 64 <100000000>;
-                       opp-microvolt = <730000>;
-               };
-
-               opp-250000000 {
-                       opp-hz = /bits/ 64 <250000000>;
-                       opp-microvolt = <730000>;
-               };
-
-               opp-500000000 {
-                       opp-hz = /bits/ 64 <500000000>;
-                       opp-microvolt = <730000>;
-               };
-
-               opp-667000000 {
-                       opp-hz = /bits/ 64 <666666666>;
-                       opp-microvolt = <750000>;
-               };
-
                opp-1000000000 {
                        opp-hz = /bits/ 64 <1000000000>;
                        opp-microvolt = <770000>;