i2c: rcar: clean up after refactoring

Update the comments to match current behaviour. Shorten some comments.
Update copyrights.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 409791302009355419fcadf80cf15f92e6eb5117..e71fd4090247aa4279ee53b88e0346c936073285 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -1,7 +1,8 @@
 /*
  * Driver for the Renesas RCar I2C unit
  *
- * Copyright (C) 2014 Wolfram Sang <wsa@sang-engineering.com>
+ * Copyright (C) 2014-15 Wolfram Sang <wsa@sang-engineering.com>
+ * Copyright (C) 2011-2015 Renesas Electronics Corporation
  *
  * Copyright (C) 2012-14 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
@@ -9,9 +10,6 @@
  * This file is based on the drivers/i2c/busses/i2c-sh7760.c
  * (c) 2005-2008 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com>
  *
- * This file used out-of-tree driver i2c-rcar.c
- * Copyright (C) 2011-2012 Renesas Electronics Corporation
- *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; version 2 of the License.
@@ -245,9 +243,7 @@ scgd_find:
        dev_dbg(dev, "clk %d/%d(%lu), round %u, CDF:0x%x, SCGD: 0x%x\n",
                scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd);
 
-       /*
-        * keep icccr value
-        */
+       /* keep icccr value */
        priv->icccr = scgd << cdf_width | cdf;
 
        return 0;
@@ -282,11 +278,7 @@ static void rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)
 {
        struct i2c_msg *msg = priv->msg;
 
-       /*
-        * FIXME
-        * sometimes, unknown interrupt happened.
-        * Do nothing
-        */
+       /* FIXME: sometimes, unknown interrupt happened. Do nothing */
        if (!(msr & MDE))
                return;
 
@@ -330,28 +322,22 @@ static void rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr)
 {
        struct i2c_msg *msg = priv->msg;
 
-       /*
-        * FIXME
-        * sometimes, unknown interrupt happened.
-        * Do nothing
-        */
+       /* FIXME: sometimes, unknown interrupt happened. Do nothing */
        if (!(msr & MDR))
                return;
 
        if (msr & MAT) {
                /* Address transfer phase finished, but no data at this point. */
        } else if (priv->pos < msg->len) {
-               /*
-                * get received data
-                */
+               /* get received data */
                msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX);
                priv->pos++;
        }
 
        /*
-        * If next received data is the _LAST_,
-        * go to STOP phase,
-        * otherwise, go to DATA phase.
+        * If next received data is the _LAST_, go to STOP phase. Might be
+        * overwritten by REP START when setting up a new msg. Not elegant
+        * but the only stable sequence for REP START I have found so far.
         */
        if (priv->pos + 1 >= msg->len)
                rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP);