[PATCH 03/12] i2c: riic: Call pm_runtime_get_sync() when need to access registers

Claudiu
2024-06-21T11:23:21Z

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

There is no need to runtime resume the device as long as the IP registers
are not accessed. Calling pm_runtime_get_sync() at the register access
time leads to a simpler error path.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
drivers/i2c/busses/i2c-riic.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index c08c988f50c7..83e4d5e14ab6 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -301,19 +301,15 @@ static const struct i2c_algorithm riic_algo = {

static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
{
- int ret = 0;
unsigned long rate;
int total_ticks, cks, brl, brh;
struct device *dev = riic->adapter.dev.parent;

- pm_runtime_get_sync(dev);
-
if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) {
dev_err(dev,
"unsupported bus speed (%dHz). %d max\n",
t->bus_freq_hz, I2C_MAX_FAST_MODE_FREQ);
- ret = -EINVAL;
- goto out;
+ return -EINVAL;
}

rate = clk_get_rate(riic->clk);
@@ -351,8 +347,7 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
if (brl > (0x1F + 3)) {
dev_err(dev, "invalid speed (%lu). Too slow.\n",
(unsigned long)t->bus_freq_hz);
- ret = -EINVAL;
- goto out;
+ return -EINVAL;
}

brh = total_ticks - brl;
@@ -384,6 +379,8 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
t->scl_fall_ns / (1000000000 / rate),
t->scl_rise_ns / (1000000000 / rate), cks, brl, brh);

+ pm_runtime_get_sync(dev);
+
/* Changing the order of accessing IICRST and ICE may break things! */
riic_writeb(riic, ICCR1_IICRST | ICCR1_SOWP, RIIC_ICCR1);
riic_clear_set_bit(riic, 0, ICCR1_ICE, RIIC_ICCR1);
@@ -397,9 +394,8 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)

riic_clear_set_bit(riic, ICCR1_IICRST, 0, RIIC_ICCR1);

-out:
pm_runtime_put(dev);
- return ret;
+ return 0;
}

static struct riic_irq_desc riic_irqs[] = {
--
2.39.2