lkml.org 
[lkml]   [2023]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] mfd: tps65219: Add support for soft shutdown via sys-off API
From
On 3/1/23 10:07 AM, Lee Jones wrote:
> On Fri, 03 Feb 2023, Jerome Neanne wrote:
>
>> Use new API for power-off mode support:
>> Link: https://lwn.net/Articles/894511/
>> Link: https://lore.kernel.org/all/7hfseqa7l0.fsf@baylibre.com/
>>
>> 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.
>>

Not sure what platform doesn't have PSCI off, since you tested on
AM62-SK I'm guessing you manually disabled the PSCI off for testing?

Anyway I don't see any huge issues with the code itself, small comment below.

>> 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-SP-SK board.
>>
>> Signed-off-by: Jerome Neanne <jneanne@baylibre.com>
>> Suggested-by: Andrew Davis <afd@ti.com>
>
> A review from Andrew would be helpful here.
>
>> ---
>> drivers/mfd/tps65219.c | 45 +++++++++++++++++++++++++++++++-----------
>> 1 file changed, 34 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/mfd/tps65219.c b/drivers/mfd/tps65219.c
>> index 0e402fda206b..c134f3f6e202 100644
>> --- a/drivers/mfd/tps65219.c
>> +++ b/drivers/mfd/tps65219.c
>> @@ -25,25 +25,34 @@ 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);
>> +}
>>
>> - 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
>> tps65219_cold_reset(tps);
>> -
>> 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 +278,27 @@ static int tps65219_probe(struct i2c_client *client)
>> }
>> }
>>
>> - tps->nb = pmic_rst_restart_nb;
>> - ret = register_restart_handler(&tps->nb);
>> + ret = devm_register_sys_off_handler(tps->dev,
>> + SYS_OFF_MODE_RESTART,
>> + SYS_OFF_PRIO_HIGH,

Why not default prio? SYS_OFF_PRIO_DEFAULT

Then you can use this new helper devm_register_restart_handler()

>> + tps65219_restart_handler,
>> + tps);
>> +
>> if (ret) {
>> dev_err(tps->dev, "cannot register restart handler, %d\n", ret);
>> return ret;
>> }
>>
>> + ret = devm_register_sys_off_handler(tps->dev,
>> + SYS_OFF_MODE_POWER_OFF,
>> + SYS_OFF_PRIO_DEFAULT,
>> + tps65219_power_off_handler,
>> + tps);


devm_register_power_off_handler()?

Otherwise I see no major issues,

Reviewed-by: Andrew Davis <afd@ti.com>

Andrew

>> + if (ret) {
>> + dev_err(tps->dev, "failed to register sys-off handler: %d\n",
>> + ret);
>> + return ret;
>> + }
>> return 0;
>> }
>>
>> --
>> 2.34.1
>>
>

\
 
 \ /
  Last update: 2023-03-27 00:40    [W:0.136 / U:24.752 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site