linux-kernel - [PATCH 4.4 19/37] i2c: rcar: refactor setup of a msg

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Date:   Tue,  5 Jun 2018 19:01:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Fabrizio Castro <fabrizio.castro@...renesas.com>,
        Chris Paterson <Chris.Paterson2@...esas.com>
Subject: [PATCH 4.4 19/37] i2c: rcar: refactor setup of a msg

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

commit b9d0684c79c4b9d30ce0d47d3270493dd0e76e59 upstream.

We want to reuse this function later.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@...esas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-rcar.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -106,7 +106,8 @@ enum rcar_i2c_type {
 struct rcar_i2c_priv {
 	void __iomem *io;
 	struct i2c_adapter adap;
-	struct i2c_msg	*msg;
+	struct i2c_msg *msg;
+	int msgs_left;
 	struct clk *clk;
 
 	wait_queue_head_t wait;
@@ -255,6 +256,11 @@ static void rcar_i2c_prepare_msg(struct
 {
 	int read = !!rcar_i2c_is_recv(priv);
 
+	priv->pos = 0;
+	priv->flags = 0;
+	if (priv->msgs_left == 1)
+		rcar_i2c_flags_set(priv, ID_LAST_MSG);
+
 	rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read);
 	rcar_i2c_write(priv, ICMSR, 0);
 	rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
@@ -499,11 +505,8 @@ static int rcar_i2c_master_xfer(struct i
 		}
 
 		/* init each data */
-		priv->msg	= &msgs[i];
-		priv->pos	= 0;
-		priv->flags	= 0;
-		if (i == num - 1)
-			rcar_i2c_flags_set(priv, ID_LAST_MSG);
+		priv->msg = &msgs[i];
+		priv->msgs_left = num - i;
 
 		rcar_i2c_prepare_msg(priv);