On 7/3/24 01:43, Nikunj Kela wrote:
On 7/2/2024 12:59 PM, Sibi Sankar wrote:
On 7/2/24 21:25, Johan Hovold wrote:
On Wed, Jun 12, 2024 at 06:10:56PM +0530, Sibi Sankar wrote:
Enable cpufreq on X1E80100 SoCs through the SCMI perf protocol node.
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/x1e80100.dtsi | 63
++++++++++++++++----------
1 file changed, 39 insertions(+), 24 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index 7b619db07694..d134dc4c7425 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -69,8 +69,8 @@ CPU0: cpu@0 {
reg = <0x0 0x0>;
enable-method = "psci";
next-level-cache = <&L2_0>;
- power-domains = <&CPU_PD0>;
- power-domain-names = "psci";
+ power-domains = <&CPU_PD0>, <&scmi_dvfs 0>;
+ power-domain-names = "psci", "perf";
cpu-idle-states = <&CLUSTER_C4>;
+ scmi {
+ compatible = "arm,scmi";
+ mboxes = <&cpucp_mbox 0>, <&cpucp_mbox 2>;
+ mbox-names = "tx", "rx";
+ shmem = <&cpu_scp_lpri0>, <&cpu_scp_lpri1>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ scmi_dvfs: protocol@13 {
+ reg = <0x13>;
+ #power-domain-cells = <1>;
+ };
+ };
};
Hey Johan,
Thanks for trying out the series.
This series gives a nice performance boost on the x1e80100 CRD, but I'm
seeing a bunch of warnings and errors that need to be addressed:
[ 9.533053] arm-scmi firmware:scmi: Failed to get FC for protocol
13 [MSG_ID:6 / RES_ID:0] - ret:-95. Using regular messaging.
[ 9.549458] arm-scmi firmware:scmi: Failed to add opps_by_lvl at
3417600 for NCC - ret:-16
[ 9.563925] arm-scmi firmware:scmi: Failed to add opps_by_lvl at
3417600 for NCC - ret:-16
[ 9.572835] arm-scmi firmware:scmi: Failed to get FC for protocol
13 [MSG_ID:6 / RES_ID:1] - ret:-95. Using regular messaging.
[ 9.609471] arm-scmi firmware:scmi: Failed to add opps_by_lvl at
3417600 for NCC - ret:-16
[ 9.633341] arm-scmi firmware:scmi: Failed to add opps_by_lvl at
3417600 for NCC - ret:-16
[ 9.650000] arm-scmi firmware:scmi: Failed to get FC for protocol
13 [MSG_ID:6 / RES_ID:2] - ret:-95. Using regular messaging.
X1E uses fast channels only for message-id: 7 (level set) and regular
channels for all the other messages. The spec doesn't mandate fast
channels for any of the supported message ids for the perf protocol.
So nothing to fix here.
[ 9.727098] cpu cpu4: _opp_is_duplicate: duplicate OPPs detected.
Existing: freq: 3417600000, volt: 0, enabled: 1. New: freq:
3417600000, volt: 0, enabled: 1
[ 9.737157] cpu cpu4: _opp_is_duplicate: duplicate OPPs detected.
Existing: freq: 3417600000, volt: 0, enabled: 1. New: freq:
3417600000, volt: 0, enabled: 1
[ 9.875039] cpu cpu8: _opp_is_duplicate: duplicate OPPs detected.
Existing: freq: 3417600000, volt: 0, enabled: 1. New: freq:
3417600000, volt: 0, enabled: 1
[ 9.888428] cpu cpu8: _opp_is_duplicate: duplicate OPPs detected.
Existing: freq: 3417600000, volt: 0, enabled: 1. New: freq:
3417600000, volt: 0, enabled: 1
The duplicate entries reported by the perf protocol come directly from
the speed bins. I was told the duplicate entry with volt 0 is meant to
indicate a lower power way of achieving the said frequency at a lower
core count. We have no way of using it in the kernel and it gets safely
discarded. So again nothing to fix in the kernel.
Hi Sibi,
Can you try increasing the max_msg_size to 256 bytes in mailbox
transport? We saw the same issue but got resolved by increasing the
max_msg_size for the transport(obviously, I reduced the max_msg to 10 to
keep the total shmem size same). Even the opps_by_lvl warning went away
with this for us.
Nikunj,
Thanks for taking time to review the series :)
Not sure if we are talking about the same things here, are you
suggesting that tweaking with the max_msg size will stop the SCMI
controller from reporting duplicate OPPs? Even if it does go away
magically wouldn't it mean you are dropping messages? Also opps_by_lvl
failing with -16 and duplicate opps detected in the opp core have the
same root cause i.e. duplicate entries reported by the controller.
Thanks,
-Nikunj
[ 9.913506] debugfs: Directory 'NCC' with parent 'pm_genpd'
already present!
[ 9.922198] debugfs: Directory 'NCC' with parent 'pm_genpd'
already present!
Yeah I did notice ^^ during dev, the series isn't the one introducing it
so it shouldn't block the series acceptance. Meanwhile I'll spend some
cycles to get this warn fixed.
Johan,
https://lore.kernel.org/lkml/20240703110741.2668800-1-quic_sibis@xxxxxxxxxxx/
Posted a fix for the warn ^^
-Sibi
Johan
