linux-kernel - [PATCH v2 1/5] firmware: qcom: scm: Add support for tsens reinit workaround

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Message-Id: <20220724122424.2509021-2-bhupesh.sharma@linaro.org>
Date:   Sun, 24 Jul 2022 17:54:20 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-pm@...r.kernel.org
Cc:     bhupesh.sharma@...aro.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: [PATCH v2 1/5] firmware: qcom: scm: Add support for tsens reinit workaround

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
+#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