shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 19:08:57 +09:00
Code Issues Packages Projects Releases Wiki Activity

usb: typec: husb311: pm process support

Browse Source 
For power consumption saving, disable 12M oscillator in HUSB311 and it
will be enabled automatically when INT occur after system resume. In
addition, if the power of HUSB311 was off in PM suspend, we must reset
the HUSB311 and tcpm port first in PM resume process to ensure the devices
can attach again.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Change-Id: Ib845318c5ee2014bd436f21c78e87e17b9433195
This commit is contained in:
Frank Wang
2021-12-30 10:48:44 +08:00
committed by Tao Huang
parent d974fb7b8e
commit f414167ae0
1 changed files with 59 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/usb/typec/tcpm/tcpci_husb311.c
View File

@@ -18,6 +18,7 @@
#define HUSB311_VID 0x2E99
#define HUSB311_PID 0x0311
#define HUSB311_TCPC_POWER 0x90
#define HUSB311_TCPC_I2C_RESET 0x9E
#define HUSB311_TCPC_SOFTRESET 0xA0
#define HUSB311_TCPC_FILTER 0xA1
@@ -32,6 +33,11 @@ struct husb311_chip {
bool vbus_on;
};
static int husb311_read8(struct husb311_chip *chip, unsigned int reg, u8 *val)
{
return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8));
}
static int husb311_write8(struct husb311_chip *chip, unsigned int reg, u8 val)
{
return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8));
@@ -209,6 +215,53 @@ static int husb311_remove(struct i2c_client *client)
return 0;
}
static int husb311_pm_suspend(struct device *dev)
{
struct husb311_chip *chip = dev->driver_data;
int ret = 0;
u8 pwr;
/*
* Disable 12M oscillator to save power consumption, and it will be
* enabled automatically when INT occur after system resume.
*/
ret = husb311_read8(chip, HUSB311_TCPC_POWER, &pwr);
if (ret < 0)
return ret;
pwr &= ~BIT(0);
ret = husb311_write8(chip, HUSB311_TCPC_POWER, pwr);
if (ret < 0)
return ret;
return 0;
}
static int husb311_pm_resume(struct device *dev)
{
struct husb311_chip *chip = dev->driver_data;
int ret = 0;
u8 pwr;
/*
* When the power of husb311 is lost or i2c read failed in PM S/R
* process, we must reset the tcpm port first to ensure the devices
* can attach again.
*/
ret = husb311_read8(chip, HUSB311_TCPC_POWER, &pwr);
if (pwr & BIT(0) || ret < 0) {
ret = husb311_sw_reset(chip);
if (ret < 0) {
dev_err(chip->dev, "fail to soft reset, ret = %d\n", ret);
return ret;
}
tcpm_tcpc_reset(tcpci_get_tcpm_port(chip->tcpci));
}
return 0;
}
static const struct i2c_device_id husb311_id[] = {
{ "husb311", 0 },
{ }
@@ -223,9 +276,15 @@ static const struct of_device_id husb311_of_match[] = {
MODULE_DEVICE_TABLE(of, husb311_of_match);
#endif
static const struct dev_pm_ops husb311_pm_ops = {
.suspend = husb311_pm_suspend,
.resume = husb311_pm_resume,
};
static struct i2c_driver husb311_i2c_driver = {
.driver = {
.name = "husb311",
.pm = &husb311_pm_ops,
.of_match_table = of_match_ptr(husb311_of_match),
},
.probe = husb311_probe,