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charset="utf-8" From: Qingqing Zhou Currently for enabling shm bridge, QTEE will return 0 and put error 4 into result[0] to qcom_scm for unsupported platform, tzmem will consider this as an unknown error not the unsupported case on the platform. Error log: [ 0.177224] qcom_scm firmware:scm: error (____ptrval____): Failed to ena= ble the TrustZone memory allocator [ 0.177244] qcom_scm firmware:scm: probe with driver qcom_scm failed wit= h error 4 Change the function call qcom_scm_shm_bridge_enable() to remap this result[0] into the unsupported error and then tzmem can consider this as unsupported case instead of reporting an error. Signed-off-by: Qingqing Zhou Co-developed-by: Kuldeep Singh Signed-off-by: Kuldeep Singh --- drivers/firmware/qcom/qcom_scm.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_= scm.c index 10986cb11ec0..620313359042 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -111,6 +111,10 @@ enum qcom_scm_qseecom_tz_cmd_info { QSEECOM_TZ_CMD_INFO_VERSION =3D 3, }; =20 +enum qcom_scm_shm_bridge_result { + SHMBRIDGE_RESULT_NOTSUPP =3D 4, +}; + #define QSEECOM_MAX_APP_NAME_SIZE 64 =20 /* Each bit configures cold/warm boot address for one of the 4 CPUs */ @@ -1361,6 +1365,8 @@ EXPORT_SYMBOL_GPL(qcom_scm_lmh_dcvsh_available); =20 int qcom_scm_shm_bridge_enable(void) { + int ret; + struct qcom_scm_desc desc =3D { .svc =3D QCOM_SCM_SVC_MP, .cmd =3D QCOM_SCM_MP_SHM_BRIDGE_ENABLE, @@ -1373,7 +1379,11 @@ int qcom_scm_shm_bridge_enable(void) QCOM_SCM_MP_SHM_BRIDGE_ENABLE)) return -EOPNOTSUPP; =20 - return qcom_scm_call(__scm->dev, &desc, &res) ?: res.result[0]; + ret =3D qcom_scm_call(__scm->dev, &desc, &res); + if (!ret && res.result[0] =3D=3D SHMBRIDGE_RESULT_NOTSUPP) + return -EOPNOTSUPP; + + return ret ?: res.result[0]; } EXPORT_SYMBOL_GPL(qcom_scm_shm_bridge_enable); =20 --=20 2.34.1