diff options
| author | Nícolas F. R. A. Prado | 2023-10-03 13:13:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-10-19 23:08:52 +0200 |
| commit | cfe535ee694d5ec03c277f94ca419cad7ba53a4a (patch) | |
| tree | eebd134750401ae12ee7d61170b3a039189f2608 /arch | |
| parent | 53c6dc71bf35346f7bca069cb0b90940e98ed762 (diff) | |
arm64: dts: mediatek: mt8195: Set DSU PMU status to fail
[ Upstream commit d192615c307ec9f74cd0582880ece698533eb99b ]
The DSU PMU allows monitoring performance events in the DSU cluster,
which is done by configuring and reading back values from the DSU PMU
system registers. However, for write-access to be allowed by ELs lower
than EL3, the EL3 firmware needs to update the setting on the ACTLR3_EL3
register, as it is disallowed by default.
That configuration is not done on the firmware used by the MT8195 SoC,
as a consequence, booting a MT8195-based machine like
mt8195-cherry-tomato-r2 with CONFIG_ARM_DSU_PMU enabled hangs the kernel
just as it writes to the CLUSTERPMOVSCLR_EL1 register, since the
instruction faults to EL3, and BL31 apparently just re-runs the
instruction over and over.
Mark the DSU PMU node in the Devicetree with status "fail", as the
machine doesn't have a suitable firmware to make use of it from the
kernel, and allowing its driver to probe would hang the kernel.
Fixes: 37f2582883be ("arm64: dts: Add mediatek SoC mt8195 and evaluation board")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230720200753.322133-1-nfraprado@collabora.com
Link: https://lore.kernel.org/r/20231003-mediatek-fixes-v6-7-v1-5-dad7cd62a8ff@collabora.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/boot/dts/mediatek/mt8195.dtsi | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi index 2c2b946b614b..ef2764a595ed 100644 --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi @@ -229,6 +229,7 @@ interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH 0>; cpus = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>, <&cpu4>, <&cpu5>, <&cpu6>, <&cpu7>; + status = "fail"; }; dmic_codec: dmic-codec { |