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From:   Amit Kucheria <amit.kucheria@linaro.org>
To:     linux-kernel@vger.kernel.org
Cc:     rnayak@codeaurora.org, linux-arm-msm@vger.kernel.org,
        bjorn.andersson@linaro.org, edubezval@gmail.com,
        smohanad@codeaurora.org, andy.gross@linaro.org,
        dianders@chromium.org, mka@chromium.org,
        Zhang Rui <rui.zhang@intel.com>, linux-pm@vger.kernel.org
Subject: [PATCH v1 07/10] thermal: tsens: Check if the IP is correctly enabled by firmware
Date:   Thu,  9 Aug 2018 18:02:39 +0530
Message-Id: <985ed415774fdac9ac21afad4b4b74f30f6c5068.1533815718.git.amit.kucheria@linaro.org>
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References: <cover.1533815718.git.amit.kucheria@linaro.org>
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The SROT registers are initialised by the secure firmware at boot. We
don't have write access to the registers. Check if the block is enabled
before continuing.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
---
 drivers/thermal/qcom/tsens-common.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
index 0b8a793f15f4..d250b757d1f0 100644
--- a/drivers/thermal/qcom/tsens-common.c
+++ b/drivers/thermal/qcom/tsens-common.c
@@ -12,6 +12,11 @@
 #include <linux/regmap.h>
 #include "tsens.h"
 
+/* SROT */
+#define CTRL_OFFSET		0x4
+#define TSENS_EN		BIT(0)
+
+/* TM */
 #define STATUS_OFFSET		0x30
 #define SN_ADDR_OFFSET		0x4
 #define SN_ST_TEMP_MASK		0x3ff
@@ -119,6 +124,8 @@ int __init init_common(struct tsens_device *tmdev)
 {
 	void __iomem *tm_base, *srot_base;
 	struct resource *res;
+	u32 code;
+	int ret;
 	struct platform_device *op = of_find_device_by_node(tmdev->dev->of_node);
 
 	if (!op)
@@ -151,5 +158,15 @@ int __init init_common(struct tsens_device *tmdev)
 	if (IS_ERR(tmdev->tm_map))
 		return PTR_ERR(tmdev->tm_map);
 
+	if (tmdev->srot_map) {
+		ret = regmap_read(tmdev->srot_map, CTRL_OFFSET, &code);
+		if (ret)
+			return ret;
+		if (!(code & TSENS_EN)) {
+			dev_err(tmdev->dev, "tsens device is not enabled\n");
+			return -ENODEV;
+		}
+	}
+
 	return 0;
 }
-- 
2.17.1