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i2c: rk3x: support master_xfer_atomic

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Enable i2c transactions in irq disabled contexts like poweroff where the
PMIC is connected via i2c.

Signed-off-by: John Keeping <john@metanate.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
John Keeping 2020-06-23 13:06:46 +01:00 committed by Wolfram Sang
parent f80531c821
commit f3e2bd7137
1 changed files with 35 additions and 4 deletions
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39
drivers/i2c/busses/i2c-rk3x.c
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@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/platform_device.h>
@ -1040,8 +1041,21 @@ static int rk3x_i2c_setup(struct rk3x_i2c *i2c, struct i2c_msg *msgs, int num)
return ret;
}
static int rk3x_i2c_xfer(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num)
static int rk3x_i2c_wait_xfer_poll(struct rk3x_i2c *i2c)
{
ktime_t timeout = ktime_add_ms(ktime_get(), WAIT_TIMEOUT);
while (READ_ONCE(i2c->busy) &&
ktime_compare(ktime_get(), timeout) < 0) {
udelay(5);
rk3x_i2c_irq(0, i2c);
}
return !i2c->busy;
}
static int rk3x_i2c_xfer_common(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num, bool polling)
{
struct rk3x_i2c *i2c = (struct rk3x_i2c *)adap->algo_data;
unsigned long timeout, flags;
@ -1075,8 +1089,12 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap,
rk3x_i2c_start(i2c);
timeout = wait_event_timeout(i2c->wait, !i2c->busy,
msecs_to_jiffies(WAIT_TIMEOUT));
if (!polling) {
timeout = wait_event_timeout(i2c->wait, !i2c->busy,
msecs_to_jiffies(WAIT_TIMEOUT));
} else {
timeout = rk3x_i2c_wait_xfer_poll(i2c);
}
spin_lock_irqsave(&i2c->lock, flags);
@ -1110,6 +1128,18 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap,
return ret < 0 ? ret : num;
}
static int rk3x_i2c_xfer(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num)
{
return rk3x_i2c_xfer_common(adap, msgs, num, false);
}
static int rk3x_i2c_xfer_polling(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num)
{
return rk3x_i2c_xfer_common(adap, msgs, num, true);
}
static __maybe_unused int rk3x_i2c_resume(struct device *dev)
{
struct rk3x_i2c *i2c = dev_get_drvdata(dev);
@ -1126,6 +1156,7 @@ static u32 rk3x_i2c_func(struct i2c_adapter *adap)
static const struct i2c_algorithm rk3x_i2c_algorithm = {
.master_xfer = rk3x_i2c_xfer,
.master_xfer_atomic = rk3x_i2c_xfer_polling,
.functionality = rk3x_i2c_func,
};