shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-09 12:17:12 +09:00
Code Issues Packages Projects Releases Wiki Activity

i2c: rockchip: fix power off issue for rk818

Browse Source 
The power off sequence is behind of i2c bus shutdown func,
it would prevent the rk818 to do power off action. The irq was
disabled when rk818 power off, it could let rk818 to power off
through i2c bus.

Change-Id: Ia6155f137ab2fa36dbe19e06878b0228670b1398
Signed-off-by: David Wu <wdc@rock-chips.com>
This commit is contained in:
David Wu
2015-10-29 07:25:37 +08:00
committed by Huang, Tao
parent 22cd957182
commit 67e6de73b6
1 changed files with 19 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/i2c/busses/i2c-rockchip.c
View File

@@ -627,12 +627,6 @@ static int rockchip_i2c_doxfer(struct rockchip_i2c *i2c,
int msleep_time = 400 * 1000 / i2c->scl_rate; // ms
int can_sleep = !(in_atomic() || irqs_disabled());
mutex_lock(&i2c->suspend_lock);
if (i2c->suspended) {
dev_err(i2c->dev, "i2c is suspended\n");
return -EIO;
}
spin_lock_irqsave(&i2c->lock, flags);
i2c->addr = msgs[0].addr;
if (msgs[0].flags & I2C_M_TEN) {
@@ -724,7 +718,6 @@ static int rockchip_i2c_doxfer(struct rockchip_i2c *i2c,
if (error == -EAGAIN)
i2c_dbg(i2c->dev, "No ack(complete_what: 0x%x), Maybe slave(addr: 0x%04x) not exist or abnormal power-on\n",
i2c->complete_what, i2c->addr);
mutex_unlock(&i2c->suspend_lock);
return error;
}
@@ -741,6 +734,16 @@ static int rockchip_i2c_xfer(struct i2c_adapter *adap,
int ret;
struct rockchip_i2c *i2c = i2c_get_adapdata(adap);
unsigned long scl_rate = i2c->scl_rate;
int can_sleep = !(in_atomic() || irqs_disabled());
if (can_sleep) {
mutex_lock(&i2c->suspend_lock);
if (i2c->suspended) {
dev_err(i2c->dev, "i2c is suspended\n");
mutex_unlock(&i2c->suspend_lock);
return -EIO;
}
}
clk_enable(i2c->clk);
if (i2c->check_idle) {
@@ -749,15 +752,16 @@ static int rockchip_i2c_xfer(struct i2c_adapter *adap,
state = rockchip_i2c_check_idle(i2c);
if (state == I2C_IDLE)
break;
if (in_atomic() || irqs_disabled())
mdelay(10);
else
if (can_sleep)
msleep(10);
else
mdelay(10);
retry--;
}
if (retry == 0) {
dev_err(i2c->dev, "i2c is not in idle(state = %d)\n", state);
return -EIO;
ret = -EIO;
goto out;
}
}
@@ -781,7 +785,11 @@ static int rockchip_i2c_xfer(struct i2c_adapter *adap,
ret = rockchip_i2c_doxfer(i2c, msgs, num);
i2c_dbg(i2c->dev, "i2c transfer stop: addr: 0x%04x, state: %d, ret: %d\n", msgs[0].addr, ret, i2c->state);
out:
clk_disable(i2c->clk);
if (can_sleep)
mutex_unlock(&i2c->suspend_lock);
return (ret < 0) ? ret : num;
}