linux-kernel - [PATCH v5 net-next 2/4] nfc: s3fwrn5: reduce the EN_WAIT

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Message-Id: <1606909661-3814-3-git-send-email-bongsu.jeon@samsung.com>
Date:   Wed,  2 Dec 2020 20:47:39 +0900
From:   Bongsu Jeon <bongsu.jeon2@...il.com>
To:     krzk@...nel.org
Cc:     linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bongsu Jeon <bongsu.jeon@...sung.com>
Subject: [PATCH v5 net-next 2/4] nfc: s3fwrn5: reduce the EN_WAIT_TIME

From: Bongsu Jeon <bongsu.jeon@...sung.com>

The delay of 20ms is enough to enable and
wake up the Samsung's nfc chip.

Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Bongsu Jeon <bongsu.jeon@...sung.com>
---
 drivers/nfc/s3fwrn5/i2c.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index ae26594..9a64eea 100644
--- a/drivers/nfc/s3fwrn5/i2c.c
+++ b/drivers/nfc/s3fwrn5/i2c.c
@@ -19,7 +19,7 @@
 
 #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
 
-#define S3FWRN5_EN_WAIT_TIME 150
+#define S3FWRN5_EN_WAIT_TIME 20
 
 struct s3fwrn5_i2c_phy {
 	struct i2c_client *i2c_dev;
@@ -40,7 +40,7 @@ static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
 
 	mutex_lock(&phy->mutex);
 	gpio_set_value(phy->gpio_fw_wake, wake);
-	msleep(S3FWRN5_EN_WAIT_TIME/2);
+	msleep(S3FWRN5_EN_WAIT_TIME);
 	mutex_unlock(&phy->mutex);
 }
 
@@ -63,7 +63,7 @@ static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
 	if (mode != S3FWRN5_MODE_COLD) {
 		msleep(S3FWRN5_EN_WAIT_TIME);
 		gpio_set_value(phy->gpio_en, 0);
-		msleep(S3FWRN5_EN_WAIT_TIME/2);
+		msleep(S3FWRN5_EN_WAIT_TIME);
 	}
 
 	phy->irq_skip = true;
-- 
1.9.1