On 21/05/2019 11:35, Amit Kucheria wrote:
> Add device bindings for cpuidle states for cpu devices.
>
> Cc: Marc Gonzalez <marc.w.gonza...@free.fr>
> Signed-off-by: Amit Kucheria <amit.kuche...@linaro.org>
> Acked-by: Daniel Lezcano <daniel.lezc...@linaro.org>
> ---
> arch/arm64/boot/dts/qcom/msm8998.dtsi | 50 +++++++++++++++++++++++++++
> 1 file changed, 50 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi
> b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> index 3fd0769fe648..54810980fcf9 100644
> --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> @@ -78,6 +78,7 @@
> compatible = "arm,armv8";
> reg = <0x0 0x0>;
> enable-method = "psci";
> + cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> &LITTLE_CPU_SLEEP_1>;
> efficiency = <1024>;
> next-level-cache = <&L2_0>;
> L2_0: l2-cache {
NB: this patch does not apply cleanly to v5.2-rc1 ;-)
86f93c93dd50 arm64: dts: msm8998: efficiency is not valid property
commit 86f93c93dd5005f0aeb8ce84c2113e21a6006c7d
Author: Amit Kucheria <amit.kuche...@linaro.org>
AuthorDate: Fri Mar 29 15:42:08 2019 +0530
Commit: Andy Gross <agr...@kernel.org>
CommitDate: Tue Apr 9 23:08:17 2019 -0500
After manually fixing up the trivial conflict, the DTB builds without errors.
I then enable
+CONFIG_CPU_IDLE=y
+CONFIG_ARM_CPUIDLE=y
(because I'm using a board-specific tiny defconfig)
And... the system starts to boot, hangs a few seconds, then silently reboots:
scsi 0:0:0:3: Direct-Access SAMSUNG KLUBG4G1CE-B0B1 0800 PQ: 0 ANSI: 6
sd 0:0:0:1: [sdb] 16384-byte physical blocks
sd 0:0:0:2: [sdc] 2048 4096-byte logical blocks: (8.39 MB/8.00 MiB)
sd 0:0:0:2: [sdc] 16384-byte physical blocks
Format: Log Type - Time(microsec) - Message - Optional Info
Log Type: B - Since Boot(Power On Reset), D - Delta, S - Statistic
S - QC_IMAGE_VERSION_STRING=BOOT.XF.1.2.2-00157-M8998LZB-1
S - IMAGE_VARIANT_STRING=Msm8998LA
Looks like the "helpful" behavior of the secure OS...
Regards.
