linux-kernel - [PATCH V4 25/30] thermal: exynos: Add a compensation logic on swapped e-fuse values

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Message-Id: <1368525540-15034-26-git-send-email-amit.daniel@samsung.com>
Date:	Tue, 14 May 2013 15:28:55 +0530
From:	Amit Daniel Kachhap <amit.daniel@...sung.com>
To:	linux-pm@...r.kernel.org
Cc:	Zhang Rui <rui.zhang@...el.com>, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
	Kukjin Kim <kgene.kim@...sung.com>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: [PATCH V4 25/30] thermal: exynos: Add a compensation logic on swapped e-fuse values

This patch adds compensation logic on swapped e-fuse values with boundary
conditions. Currently, e-fused trim values for sensor0 is swapped with
sensor2 so the logic in this patch is needed. sensor1 e-fused trim value is
correct.

Signed-off-by: Jungseok Lee <jays.lee@...sung.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
---
 drivers/thermal/samsung/exynos_tmu.c      |   23 +++++++++++++++++++++--
 drivers/thermal/samsung/exynos_tmu_data.h |    1 +
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 671061b..f32d275 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -137,7 +137,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct exynos_tmu_platform_data *pdata = data->pdata;
 	const struct exynos_tmu_registers *reg = pdata->registers;
-	unsigned int status, trim_info, con;
+	unsigned int status, trim_info = 0, con;
 	unsigned int rising_threshold = 0, falling_threshold = 0;
 	int ret = 0, threshold_code, i, trigger_levs = 0;
 
@@ -156,7 +156,26 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 		__raw_writel(1, data->base + reg->triminfo_ctrl);
 
 	/* Save trimming info in order to perform calibration */
-	trim_info = readl(data->base + reg->triminfo_data);
+	if (data->soc == SOC_ARCH_EXYNOS5440) {
+		/*
+		 * For exynos5440 soc triminfo value is swapped between TMU0 and
+		 * TMU2, so the below logic is needed.
+		 */
+		switch (data->id) {
+		case 0:
+			trim_info = readl(data->base +
+			EXYNOS5440_EFUSE_SWAP_OFFSET + reg->triminfo_data);
+			break;
+		case 1:
+			trim_info = readl(data->base + reg->triminfo_data);
+			break;
+		case 2:
+			trim_info = readl(data->base -
+			EXYNOS5440_EFUSE_SWAP_OFFSET + reg->triminfo_data);
+		}
+	} else {
+		trim_info = readl(data->base + reg->triminfo_data);
+	}
 	data->temp_error1 = trim_info & EXYNOS_TMU_TEMP_MASK;
 	data->temp_error2 = ((trim_info >> reg->triminfo_85_shift) &
 				EXYNOS_TMU_TEMP_MASK);
diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
index eb7250d..a1cc8ab 100644
--- a/drivers/thermal/samsung/exynos_tmu_data.h
+++ b/drivers/thermal/samsung/exynos_tmu_data.h
@@ -127,6 +127,7 @@
 #define EXYNOS5440_TMU_TH_RISE2_SHIFT		16
 #define EXYNOS5440_TMU_TH_RISE3_SHIFT		24
 #define EXYNOS5440_TMU_TH_RISE4_SHIFT		24
+#define EXYNOS5440_EFUSE_SWAP_OFFSET		8
 
 #if defined(CONFIG_CPU_EXYNOS4210)
 extern struct exynos_tmu_platform_data const exynos4210_default_tmu_data;
-- 
1.7.1

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