We can directly add the stop token to the token chain including the
last transfer chunk. This is more efficient than creating a separate
token chain just for the stop command.
And it allows us to get rid of state STATE_STOP completely.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/i2c/busses/i2c-meson.c | 27 +++++++--------------------
1 file changed, 7 insertions(+), 20 deletions(-)
diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c
index 58414699..b11ecfdd 100644
--- a/drivers/i2c/busses/i2c-meson.c
+++ b/drivers/i2c/busses/i2c-meson.c
@@ -55,7 +55,6 @@ enum {
STATE_IDLE,
STATE_READ,
STATE_WRITE,
- STATE_STOP,
};
/**
@@ -201,23 +200,13 @@ static void meson_i2c_prepare_xfer(struct meson_i2c *i2c)
else
meson_i2c_add_token(i2c, TOKEN_DATA_LAST);
+ if (i2c->last && i2c->pos + i2c->count >= i2c->msg->len)
+ meson_i2c_add_token(i2c, TOKEN_STOP);
+
if (write)
meson_i2c_put_data(i2c, i2c->msg->buf + i2c->pos, i2c->count);
}
-static void meson_i2c_stop(struct meson_i2c *i2c)
-{
- dev_dbg(i2c->dev, "%s: last %d\n", __func__, i2c->last);
-
- if (i2c->last) {
- i2c->state = STATE_STOP;
- meson_i2c_add_token(i2c, TOKEN_STOP);
- } else {
- i2c->state = STATE_IDLE;
- complete(&i2c->done);
- }
-}
-
static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
{
struct meson_i2c *i2c = dev_id;
@@ -259,7 +248,8 @@ static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
i2c->pos += i2c->count;
if (i2c->pos >= i2c->msg->len) {
- meson_i2c_stop(i2c);
+ i2c->state = STATE_IDLE;
+ complete(&i2c->done);
break;
}
@@ -269,16 +259,13 @@ static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
i2c->pos += i2c->count;
if (i2c->pos >= i2c->msg->len) {
- meson_i2c_stop(i2c);
+ i2c->state = STATE_IDLE;
+ complete(&i2c->done);
break;
}
meson_i2c_prepare_xfer(i2c);
break;
- case STATE_STOP:
- i2c->state = STATE_IDLE;
- complete(&i2c->done);
- break;
}
out:
--
2.12.0
--
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