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RSC v4.5 and newer expect read commands to use a 4-byte message payload, while write commands continue to use 8 bytes. Update the message length used for read requests on those controllers. Some platforms either do not support RPMh read requests or AOSS does not respond to them. Issuing a read there can occupy an ACTIVE TCS indefinitely and block subsequent write requests. Skip read commands on sm8150 and sc8180x [1] returning a zero resource level so callers avoid error handling for an unsupported read path. Patch 1 has no dependency. A Fixes tag is not required because existing upstream SoCs use RSC versions older than v4.5. Patch 1 can be applied as preparation for Hawi SoC support. Patch 2 carries a Fixes tag. I do not have sm8150 or sc8180x hardware to verify patch 2. If there are reports like [1] of read requests not working on past SoCs, the list can be expanded in rpmh_rsc_no_rpmh_read(). [1] https://lore.kernel.org/linux-arm-msm/0a73bc50-71f4-43f8-9d95-14a763d63c61@oss.qualcomm.com/ Signed-off-by: Maulik Shah --- Changes in v2: - Define CMD_MSGID_LEN as a field and use FIELD_PREP() for lengths. - Keep the read length selection explicit for RSC v4.5 and newer. - Keep Tested-by for patch-1. - No changes to patch-2. - Link to v1: https://patch.msgid.link/20260910-rsc_read-v1-0-c9b7fa3cdde2@oss.qualcomm.com To: Bjorn Andersson To: Konrad Dybcio To: Maulik Shah To: Dmitry Baryshkov To: Mark Brown To: Kamal Wadhwa Cc: linux-arm-msm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Konrad Dybcio --- Maulik Shah (2): soc: qcom: rpmh-rsc: Update CMD_MSGID_LEN to 4 bytes for read request soc: qcom: rpmh-rsc: Skip read requests on unsupported platforms drivers/soc/qcom/rpmh-internal.h | 2 ++ drivers/soc/qcom/rpmh-rsc.c | 21 ++++++++++++++++++--- drivers/soc/qcom/rpmh.c | 6 ++++++ 3 files changed, 26 insertions(+), 3 deletions(-) --- base-commit: c68a982815dcce5464e3bf2a31ac94f5146c04ca change-id: 20260910-rsc_read-27d689e37cb5 Best regards, -- Maulik Shah