linux-kernel - [PATCH v2,5/7] thermal: mediatek: add flag for bank selection

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Date:   Wed, 20 Feb 2019 20:31:31 +0800
From:   <michael.kao@...iatek.com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Michael Kao <michael.kao@...iatek.com>
Subject: [PATCH v2,5/7] thermal: mediatek: add flag for bank selection

From: Michael Kao <michael.kao@...iatek.com>

For past ic designs, the thermal controller should select banks before
reading the thermal sensor.
And the new ic design architecture removes this mechanism.

Signed-off-by: Michael Kao <michael.kao@...iatek.com>
---
 drivers/thermal/mtk_thermal.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index c96a746..0a3944e 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -213,6 +213,7 @@ struct mtk_thermal_data {
 	const int cali_val;
 	const int num_controller;
 	const int *controller_offset;
+	bool need_switch_bank;
 	struct thermal_bank_cfg bank_data[];
 };
 
@@ -327,6 +328,7 @@ struct mtk_thermal {
 	.cali_val = MT8173_CALIBRATION,
 	.num_controller = MT8173_NUM_CONTROLLER,
 	.controller_offset = mt8173_tc_offset,
+	.need_switch_bank = true,
 	.bank_data = {
 		{
 			.num_sensors = 2,
@@ -365,6 +367,7 @@ struct mtk_thermal {
 	.cali_val = MT2701_CALIBRATION,
 	.num_controller = MT2701_NUM_CONTROLLER,
 	.controller_offset = mt2701_tc_offset,
+	.need_switch_bank = true,
 	.bank_data = {
 		{
 			.num_sensors = 3,
@@ -394,6 +397,7 @@ struct mtk_thermal {
 	.cali_val = MT2712_CALIBRATION,
 	.num_controller = MT2712_NUM_CONTROLLER,
 	.controller_offset = mt2712_tc_offset,
+	.need_switch_bank = true,
 	.bank_data = {
 		{
 			.num_sensors = 4,
@@ -417,6 +421,7 @@ struct mtk_thermal {
 	.cali_val = MT7622_CALIBRATION,
 	.num_controller = MT7622_NUM_CONTROLLER,
 	.controller_offset = mt7622_tc_offset,
+	.need_switch_bank = true,
 	.bank_data = {
 		{
 			.num_sensors = 1,
@@ -463,12 +468,14 @@ static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank)
 	struct mtk_thermal *mt = bank->mt;
 	u32 val;
 
-	mutex_lock(&mt->lock);
+	if (mt->conf->need_switch_bank) {
+		mutex_lock(&mt->lock);
 
-	val = readl(mt->thermal_base + PTPCORESEL);
-	val &= ~0xf;
-	val |= bank->id;
-	writel(val, mt->thermal_base + PTPCORESEL);
+		val = readl(mt->thermal_base + PTPCORESEL);
+		val &= ~0xf;
+		val |= bank->id;
+		writel(val, mt->thermal_base + PTPCORESEL);
+	}
 }
 
 /**
@@ -481,7 +488,8 @@ static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
 {
 	struct mtk_thermal *mt = bank->mt;
 
-	mutex_unlock(&mt->lock);
+	if (mt->conf->need_switch_bank)
+		mutex_unlock(&mt->lock);
 }
 
 /**
-- 
1.9.1