linux-kernel - [PATCH 2/3] i2c: xilinx: Set tx direction in write operation

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Date:	Mon, 30 Sep 2013 11:08:51 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	linux-kernel@...r.kernel.org, monstr@...str.eu
Cc:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Kedareswara rao Appana <appanad@...inx.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Peter Korsgaard <jacmet@...site.dk>, linux-i2c@...r.kernel.org
Subject: [PATCH 2/3] i2c: xilinx: Set tx direction in write operation

From: Kedareswara rao Appana <appana.durga.rao@...inx.com>

In write operation, after filling address byte to tx fifo,
set the direction of transfer to tx using control register.

Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
 drivers/i2c/busses/i2c-xiic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index 5eb0a8b..44e6ae7 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -536,6 +536,7 @@ static void xiic_start_recv(struct xiic_i2c *i2c)
 static void xiic_start_send(struct xiic_i2c *i2c)
 {
 	struct i2c_msg *msg = i2c->tx_msg;
+	u32 cr;

 	xiic_irq_clr(i2c, XIIC_INTR_TX_ERROR_MASK);

@@ -556,6 +557,10 @@ static void xiic_start_send(struct xiic_i2c *i2c)
 		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
 	}

+	cr = xiic_getreg32(i2c, XIIC_CR_REG_OFFSET);
+	cr |= XIIC_CR_DIR_IS_TX_MASK;
+	xiic_setreg32(i2c, XIIC_CR_REG_OFFSET, cr);
+
 	xiic_fill_tx_fifo(i2c);

 	/* Clear any pending Tx empty, Tx Error and then enable them. */
--
1.8.2.3


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