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i2c: meson: improve and simplify interrupt handler 

The preceding changes in this patch series now allow to simplify
the interrupt handler significantly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Heiner Kallweit 2017-03-25 14:14:08 +01:00 committed by Wolfram Sang
parent 3911764cfb
commit cda816d163
1 changed files with 10 additions and 30 deletions
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32
drivers/i2c/busses/i2c-meson.c
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@ -242,41 +242,21 @@ static irqreturn_t meson_i2c_irq(int irqno, void *dev_id)
goto out;
}
switch (i2c->state) {
case STATE_READ:
if (i2c->count > 0) {
meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos,
i2c->count);
i2c->pos += i2c->count;
}
if (i2c->state == STATE_READ && i2c->count)
meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos, i2c->count);
if (i2c->pos >= i2c->msg->len) {
i2c->state = STATE_IDLE;
complete(&i2c->done);
break;
}
meson_i2c_prepare_xfer(i2c);
break;
case STATE_WRITE:
i2c->pos += i2c->count;
if (i2c->pos >= i2c->msg->len) {
i2c->state = STATE_IDLE;
complete(&i2c->done);
break;
goto out;
}
meson_i2c_prepare_xfer(i2c);
break;
}
out:
if (i2c->state != STATE_IDLE)
/* Restart the processing */
meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START,
REG_CTRL_START);
meson_i2c_prepare_xfer(i2c);
meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, REG_CTRL_START);
out:
spin_unlock(&i2c->lock);
return IRQ_HANDLED;