linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sc7280: Drop aggre{1,2}

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Message-ID: <90b13660-1844-4701-8e63-7fde2f093db0@oss.qualcomm.com>
Date: Tue, 2 Sep 2025 14:02:15 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Brian Norris <briannorris@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Odelu Kukatla <quic_okukatla@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org, Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Douglas Anderson <dianders@...omium.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sc7280: Drop aggre{1,2}_noc QOS
 clocks on Herobrine

On 8/26/25 12:55 AM, Brian Norris wrote:
> Ever since these two commits
> 
>   fbd908bb8bc0 ("interconnect: qcom: sc7280: enable QoS configuration")
>   2b5004956aff ("arm64: dts: qcom: sc7280: Add clocks for QOS configuration")
> 
> Herobrine systems fail to boot due to crashes like the following:
> 
> [    0.243171] Kernel panic - not syncing: Asynchronous SError Interrupt
> [    0.243173] CPU: 7 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0 #1 c5464041cff584ced692726af2c4400fa2bde1db
> [    0.243178] Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT)
> [    0.243180] Call trace:
> [    0.243182]  dump_backtrace+0x104/0x128
> [    0.243194]  show_stack+0x24/0x38
> [    0.243202]  __dump_stack+0x28/0x38
> [    0.243208]  dump_stack_lvl+0x28/0xb8
> [    0.243211]  dump_stack+0x18/0x30
> [    0.243215]  panic+0x134/0x340
> [    0.243219]  nmi_panic+0x48/0x98
> [    0.243227]  arm64_serror_panic+0x6c/0x80
> [    0.243245]  arm64_is_fatal_ras_serror+0xd8/0xe0
> [    0.243261]  do_serror+0x5c/0xa8
> [    0.243265]  el1h_64_error_handler+0x34/0x48
> [    0.243272]  el1h_64_error+0x7c/0x80
> [    0.243285]  regmap_mmio_read+0x5c/0xc0
> [    0.243289]  _regmap_bus_reg_read+0x78/0xf8
> [    0.243296]  regmap_update_bits_base+0xec/0x3a8
> [    0.243300]  qcom_icc_rpmh_probe+0x2d4/0x490
> [    0.243308]  platform_probe+0xb4/0xe0
> [...]
> 
> Specifically, they fail in qcom_icc_set_qos() when trying to write the
> QoS settings for qhm_qup1. Several of the previous nodes (qhm_qspi,
> qhm_qup0, ...) seem to configure without crashing.
> 
> We suspect that the TZ firmware on these devices does not expose QoS
> regions to Linux. The right solution here might involve deleting both
> 'clocks' and 'reg', but 'reg' would cause more problems. Linux is
> already OK with a missing 'clocks', since pre-2b5004956aff DTBs need to
> be supported, so we go with an easier solution.

Just to make sure I'm reading this right - the clocks enable just fine,
but it's the writes to the QoS settings that trigger the hang?
Any chance skipping qhm_qup1 specifically makes things better?

Could you please share your exact software version (which I assume is really
just the version of TF-A in this case) so I can try and reproduce it?

Konrad