Hello all, and sorry for spam, On Fri, 2024-11-15 at 09:15 +0100, Alexander Sverdlin wrote: > > Use new API for power-off mode support: > > Link: https://lwn.net/Articles/894511/ > > Link: https://lore.kernel.org/all/7hfseqa7l0.fsf@xxxxxxxxxxxx/ > > > > sys-off API allows support of shutdown handler and restart handler. > > > > Shutdown was not supported before that enhancement. > > This is required for platform that are not using PSCI. > > > > Test: > > - restart: > > # reboot > > Default is cold reset: > > # cat /sys/kernel/reboot/mode > > Switch boot mode to warm reset: > > # echo warm > /sys/kernel/reboot/mode > > - power-off: > > # halt > > > > Tested on AM62-LP-SK board. > > > > Signed-off-by: Jerome Neanne <jneanne@xxxxxxxxxxxx> > > Suggested-by: Andrew Davis <afd@xxxxxx> > > Reviewed-by: Andrew Davis <afd@xxxxxx> > > --- > > > > Notes: > > Change-log v3 to v2 > > v2: Link: https://lore.kernel.org/lkml/20230511122100.2225417-1-jneanne@xxxxxxxxxxxx/ > > Lee Jones Review: > > nits: rm not needed line wraps and restore a cr deleted not related with the patch. > > > > Change-log v2 to v1 > > v1: Link: https://lore.kernel.org/all/20230203140150.13071-1-jneanne@xxxxxxxxxxxx/ > > Andrew Davis Review: > > - Use new helpers devm_register_restart_handler and devm_register_power_off_handler > > Vignesh Raghavendra: > > - Fix typo on board name in commit message > > > > drivers/mfd/tps65219.c | 38 ++++++++++++++++++++++++++++---------- > > 1 file changed, 28 insertions(+), 10 deletions(-) > > > > diff --git a/drivers/mfd/tps65219.c b/drivers/mfd/tps65219.c > > index 0e402fda206b..3d9164491e20 100644 > > --- a/drivers/mfd/tps65219.c > > +++ b/drivers/mfd/tps65219.c > > @@ -25,13 +25,21 @@ static int tps65219_cold_reset(struct tps65219 *tps) > > TPS65219_MFP_COLD_RESET_I2C_CTRL_MASK); > > } > > > > -static int tps65219_restart(struct notifier_block *this, > > - unsigned long reboot_mode, void *cmd) > > +static int tps65219_soft_shutdown(struct tps65219 *tps) > > { > > - struct tps65219 *tps; > > + return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL, > > + TPS65219_MFP_I2C_OFF_REQ_MASK, > > + TPS65219_MFP_I2C_OFF_REQ_MASK); > > I suppose this is I2C access and is therefore a [potentially] sleeping call? > Could this be an issue, see below... I totally missed master_xfer_atomic = omap_i2c_xfer_polling in i2c-omap.c! No issues here, I'm sorry! > > +} > > > > - tps = container_of(this, struct tps65219, nb); > > +static int tps65219_power_off_handler(struct sys_off_data *data) > > +{ > > + tps65219_soft_shutdown(data->cb_data); > > + return NOTIFY_DONE; > > +} > > > > +static int tps65219_restart(struct tps65219 *tps, unsigned long reboot_mode) > > +{ > > if (reboot_mode == REBOOT_WARM) > > tps65219_warm_reset(tps); > > else > > @@ -40,10 +48,11 @@ static int tps65219_restart(struct notifier_block *this, > > return NOTIFY_DONE; > > } > > > > -static struct notifier_block pmic_rst_restart_nb = { > > - .notifier_call = tps65219_restart, > > - .priority = 200, > > -}; > > +static int tps65219_restart_handler(struct sys_off_data *data) > > +{ > > + tps65219_restart(data->cb_data, data->mode); > > + return NOTIFY_DONE; > > +} > > > > static const struct resource tps65219_pwrbutton_resources[] = { > > DEFINE_RES_IRQ_NAMED(TPS65219_INT_PB_FALLING_EDGE_DETECT, "falling"), > > @@ -269,13 +278,22 @@ static int tps65219_probe(struct i2c_client *client) > > } > > } > > > > - tps->nb = pmic_rst_restart_nb; > > - ret = register_restart_handler(&tps->nb); > > + ret = devm_register_restart_handler(tps->dev, > > + tps65219_restart_handler, > > + tps); > > + > > if (ret) { > > dev_err(tps->dev, "cannot register restart handler, %d\n", ret); > > return ret; > > } > > > > + ret = devm_register_power_off_handler(tps->dev, > > + tps65219_power_off_handler, > > + tps); > > ... while this translates to > return devm_register_sys_off_handler(dev, > SYS_OFF_MODE_POWER_OFF, > ... might this be an issue? > > enum sys_off_mode { > > [] > /** > * @SYS_OFF_MODE_POWER_OFF: > * > * Handlers power-off system. Handlers are disallowed to sleep. > */ > SYS_OFF_MODE_POWER_OFF, > > > > + if (ret) { > > + dev_err(tps->dev, "failed to register power-off handler: %d\n", ret); > > + return ret; > > + } > > return 0; > > } > -- Alexander Sverdlin Siemens AG www.siemens.com
