arm64: dts: qcom: qcs615: fix a crash issue caused by infinite loop for Coresight

An infinite loop has been created by the Coresight devices. When only a
source device is enabled, the coresight_find_activated_sysfs_sink function
is recursively invoked in an attempt to locate an active sink device,
ultimately leading to a stack overflow and system crash. Therefore, disable
the replicator1 to break the infinite loop and prevent a potential stack
overflow.

replicator1_out   ->   funnel_swao_in6   ->   tmc_etf_swao_in   ->  tmc_etf_swao_out
     |                                                                     |
replicator1_in                                                     replicator_swao_in
     |                                                                     |
replicator0_out1                                                   replicator_swao_out0
     |                                                                     |
replicator0_in                                                     funnel_in1_in3
     |                                                                     |
tmc_etf_out <- tmc_etf_in <- funnel_merg_out <- funnel_merg_in1 <- funnel_in1_out

[call trace]
   dump_backtrace+0x9c/0x128
   show_stack+0x20/0x38
   dump_stack_lvl+0x48/0x60
   dump_stack+0x18/0x28
   panic+0x340/0x3b0
   nmi_panic+0x94/0xa0
   panic_bad_stack+0x114/0x138
   handle_bad_stack+0x34/0xb8
   __bad_stack+0x78/0x80
   coresight_find_activated_sysfs_sink+0x28/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   ...
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_enable_sysfs+0x80/0x2a0 [coresight]

side effect after the change:
Only trace data originating from AOSS can reach the ETF_SWAO and EUD sinks.

Fixes: bf469630552a ("arm64: dts: qcom: qcs615: Add coresight nodes")
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250522005016.2148-1-jie.gan@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/qcs615.dtsi b/arch/arm64/boot/dts/qcom/qcs615.dtsi
index bb8b6c3ebd03f086b44493024ce782acf6f9e1ed..559d3a4ba605c19c140aee235cb99e0d31bffeab 100644 (file)
--- a/arch/arm64/boot/dts/qcom/qcs615.dtsi
+++ b/arch/arm64/boot/dts/qcom/qcs615.dtsi
@@ -1902,6 +1902,7 @@
 
                        clocks = <&aoss_qmp>;
                        clock-names = "apb_pclk";
+                       status = "disabled";
 
                        in-ports {
                                port {