linux-kernel - Re: [PATCH v3 1/4] firmware: qcom: scm: Add support for tsens reinit workaround

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Date:   Tue, 30 Aug 2022 22:33:56 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     linux-pm@...r.kernel.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
        konrad.dybcio@...ainline.org, linux-arm-msm@...r.kernel.org,
        daniel.lezcano@...aro.org, robh+dt@...nel.org, rafael@...nel.org,
        Amit Kucheria <amitk@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>
Subject: Re: [PATCH v3 1/4] firmware: qcom: scm: Add support for tsens reinit
 workaround


On 8/30/22 3:45 AM, Bjorn Andersson wrote:
> On Thu, Aug 04, 2022 at 11:16:35AM +0530, Bhupesh Sharma wrote:
>> Some versions of Qualcomm 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: Bjorn Andersson <bjorn.andersson@...aro.org>
>> Cc: Amit Kucheria <amitk@...nel.org>
>> Cc: Thara Gopinath <thara.gopinath@...il.com>
>> Cc: linux-pm@...r.kernel.org
>> Cc: linux-arm-msm@...r.kernel.org
>> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
>> ---
>>   drivers/firmware/qcom_scm.c | 15 +++++++++++++++
>>   drivers/firmware/qcom_scm.h |  4 ++++
>>   include/linux/qcom_scm.h    |  2 ++
>>   3 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
>> index cdbfe54c8146..93adcc046a62 100644
>> --- a/drivers/firmware/qcom_scm.c
>> +++ b/drivers/firmware/qcom_scm.c
>> @@ -858,6 +858,21 @@ 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(void)
>> +{
>> +	int ret;
>> +	const 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);
>> +
>> +	return ret ? : res.result[0];
>> +}
>> +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
> 
> It would be nice if this 'E' was lowercase.

Sure, will fix this in v4.

> Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Thanks,
Bhupesh

>> +#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..5c37e1658cef 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(void);
>> +
>>   #endif
>> -- 
>> 2.35.3
>>