i2c: mv64xxx: refactor message start to ensure proper initialization

commit 79970db213344b4a4034645db5ebfc31571f3fa3 upstream.

Because the offload mechanism can fall back to a standard transfer,
having two seperate initialization states is unfortunate. Let's just
have one state which does things consistently. This fixes a bug where
some preparation was missing when the fallback happened. And it makes
the code much easier to follow. To implement this, we put the check
if offload is possible at the top of the offload setup function.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Fixes: 930ab3d403ae (i2c: mv64xxx: Add I2C Transaction Generator support)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 6f02eb8..564c1c0 100644 (file)
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -97,7 +97,6 @@ enum {
 enum {
        MV64XXX_I2C_ACTION_INVALID,
        MV64XXX_I2C_ACTION_CONTINUE,
-       MV64XXX_I2C_ACTION_OFFLOAD_SEND_START,
        MV64XXX_I2C_ACTION_SEND_START,
        MV64XXX_I2C_ACTION_SEND_RESTART,
        MV64XXX_I2C_ACTION_OFFLOAD_RESTART,
@@ -204,6 +203,9 @@ static int mv64xxx_i2c_offload_msg(struct mv64xxx_i2c_data *drv_data)
        unsigned long ctrl_reg;
        struct i2c_msg *msg = drv_data->msgs;
 
+       if (!drv_data->offload_enabled)
+               return -EOPNOTSUPP;
+
        drv_data->msg = msg;
        drv_data->byte_posn = 0;
        drv_data->bytes_left = msg->len;
@@ -433,8 +435,7 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 
                drv_data->msgs++;
                drv_data->num_msgs--;
-               if (!(drv_data->offload_enabled &&
-                               mv64xxx_i2c_offload_msg(drv_data))) {
+               if (mv64xxx_i2c_offload_msg(drv_data) < 0) {
                        drv_data->cntl_bits |= MV64XXX_I2C_REG_CONTROL_START;
                        writel(drv_data->cntl_bits,
                        drv_data->reg_base + drv_data->reg_offsets.control);
@@ -458,15 +459,14 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
                        drv_data->reg_base + drv_data->reg_offsets.control);
                break;
 
-       case MV64XXX_I2C_ACTION_OFFLOAD_SEND_START:
-               if (!mv64xxx_i2c_offload_msg(drv_data))
-                       break;
-               else
-                       drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
-               /* FALLTHRU */
        case MV64XXX_I2C_ACTION_SEND_START:
-               writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
-                       drv_data->reg_base + drv_data->reg_offsets.control);
+               /* Can we offload this msg ? */
+               if (mv64xxx_i2c_offload_msg(drv_data) < 0) {
+                       /* No, switch to standard path */
+                       mv64xxx_i2c_prepare_for_io(drv_data, drv_data->msgs);
+                       writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
+                               drv_data->reg_base + drv_data->reg_offsets.control);
+               }
                break;
 
        case MV64XXX_I2C_ACTION_SEND_ADDR_1:
@@ -625,15 +625,10 @@ mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg,
        unsigned long   flags;
 
        spin_lock_irqsave(&drv_data->lock, flags);
-       if (drv_data->offload_enabled) {
-               drv_data->action = MV64XXX_I2C_ACTION_OFFLOAD_SEND_START;
-               drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
-       } else {
-               mv64xxx_i2c_prepare_for_io(drv_data, msg);
 
-               drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
-               drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
-       }
+       drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
+       drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
+
        drv_data->send_stop = is_last;
        drv_data->block = 1;
        mv64xxx_i2c_do_action(drv_data);