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    Subject[PATCH 1/3] firmware: qcom_scm: Add support for tsens reinit workaround
    Date
    Some versions of QCoM tsens controller might enter a
    'bad state' while running stability tests causing sensor
    temperatures/interrupts status to be in an 'invalid' state.

    It is recommended to re-initialize the tsens controller
    via trustzone (secure registers) using scm call(s) when that
    happens.

    Add support for the same in the qcom_scm driver.

    Cc: Amit Kucheria <amitk@kernel.org>
    Cc: Thara Gopinath <thara.gopinath@gmail.com>
    Cc: linux-pm@vger.kernel.org
    Cc: linux-arm-msm@vger.kernel.org
    Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
    ---
    drivers/firmware/qcom_scm.c | 17 +++++++++++++++++
    drivers/firmware/qcom_scm.h | 4 ++++
    include/linux/qcom_scm.h | 2 ++
    3 files changed, 23 insertions(+)

    diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
    index 3163660fa8e2..0bc7cc466218 100644
    --- a/drivers/firmware/qcom_scm.c
    +++ b/drivers/firmware/qcom_scm.c
    @@ -796,6 +796,23 @@ int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
    }
    EXPORT_SYMBOL(qcom_scm_mem_protect_video_var);

    +int qcom_scm_tsens_reinit(int *tsens_ret)
    +{
    + unsigned int ret;
    + struct qcom_scm_desc desc = {
    + .svc = QCOM_SCM_SVC_TSENS,
    + .cmd = QCOM_SCM_TSENS_INIT_ID,
    + };
    + struct qcom_scm_res res;
    +
    + ret = qcom_scm_call(__scm->dev, &desc, &res);
    + if (tsens_ret)
    + *tsens_ret = res.result[0];
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(qcom_scm_tsens_reinit);
    +
    static int __qcom_scm_assign_mem(struct device *dev, phys_addr_t mem_region,
    size_t mem_sz, phys_addr_t src, size_t src_sz,
    phys_addr_t dest, size_t dest_sz)
    diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
    index 0d51eef2472f..495fa00230c7 100644
    --- a/drivers/firmware/qcom_scm.h
    +++ b/drivers/firmware/qcom_scm.h
    @@ -94,6 +94,10 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
    #define QCOM_SCM_PIL_PAS_IS_SUPPORTED 0x07
    #define QCOM_SCM_PIL_PAS_MSS_RESET 0x0a

    +/* TSENS Services and Function IDs */
    +#define QCOM_SCM_SVC_TSENS 0x1E
    +#define QCOM_SCM_TSENS_INIT_ID 0x5
    +
    #define QCOM_SCM_SVC_IO 0x05
    #define QCOM_SCM_IO_READ 0x01
    #define QCOM_SCM_IO_WRITE 0x02
    diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
    index f8335644a01a..f8c9eb739df1 100644
    --- a/include/linux/qcom_scm.h
    +++ b/include/linux/qcom_scm.h
    @@ -124,4 +124,6 @@ extern int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
    extern int qcom_scm_lmh_profile_change(u32 profile_id);
    extern bool qcom_scm_lmh_dcvsh_available(void);

    +extern int qcom_scm_tsens_reinit(int *tsens_ret);
    +
    #endif
    --
    2.35.3
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