diff mbox series

[v3] mfd: rk808: add reboot support to rk808.c

Message ID 20211220144654.926112-1-pgwipeout@gmail.com (mailing list archive)
State New, archived
Headers show
Series [v3] mfd: rk808: add reboot support to rk808.c | expand

Commit Message

Peter Geis Dec. 20, 2021, 2:46 p.m. UTC 
This adds reboot support to the rk808 pmic driver and enables it for
the rk809 and rk817 devices.
This only enables if the rockchip,system-power-controller flag is set.

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
This patch was created to address issues with psci-reset on rk356x
chips. Until the rk356x series ATF open source code is released so we
can fix the issue at the source, this is the only way to ensure reliable
resetting on devices using these chips.

After testing the rk808 (thanks Robin!), it was found DEV_OFF_RST does
not reset the PMIC to a power on state. Since the rk805 and rk818 match
this register layout, I'm removing support for all three in the v2.
It may be possible to add support to them using an RTC wakeup, but that
has not been explored and is outside the scope of this patch.

Changelog:
V3: Thanks Dmitry!
- Adjust priority to be in line with other pmic drivers
- Move ret handling to case switch
- Make default registration debug
- Add unregister function on removal

V2:
- Squash the patch from Frank Wunderlich for rk809 support.
- Remove support for the rk805, rk808, and rk818 devices.
- Only register the reset handler for supported devices.
- Remove unnecessary dev_err and dev_warn statements.
- Register the reset handler directly

 drivers/mfd/rk808.c       | 45 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/rk808.h |  1 +
 2 files changed, 46 insertions(+)

Comments

Dmitry Osipenko Dec. 20, 2021, 2:53 p.m. UTC | #1 
20.12.2021 17:46, Peter Geis пишет:
> +static int rk808_restart_notify(struct notifier_block *this, unsigned long mode, void *cmd)
> +{
> +	int ret;
> +	unsigned int reg, bit;
> +	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);

Such code usually should be written in a form of reverse Xmas tree in
kernel, but no need to respin just because of it. The patch looks good
to me, thank you.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Frank Wunderlich Dec. 20, 2021, 4:33 p.m. UTC | #2 
Hi

> Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
> Von: "Peter Geis" <pgwipeout@gmail.com>
> @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client *client)
>  	if (pm_power_off == rk808_pm_power_off)
>  		pm_power_off = NULL;
>
> +	if (of_property_read_bool(np, "rockchip,system-power-controller"))
> +		unregister_restart_handler(&rk808_restart_handler);
> +
>  	return 0;
>  }

this change misses a declaration

struct device_node *np = client->dev.of_node;

regards Frank
Dmitry Osipenko Dec. 20, 2021, 4:36 p.m. UTC | #3 
20.12.2021 19:33, Frank Wunderlich пишет:
> Hi
> 
>> Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
>> Von: "Peter Geis" <pgwipeout@gmail.com>
>> @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client *client)
>>  	if (pm_power_off == rk808_pm_power_off)
>>  		pm_power_off = NULL;
>>
>> +	if (of_property_read_bool(np, "rockchip,system-power-controller"))
>> +		unregister_restart_handler(&rk808_restart_handler);
>> +
>>  	return 0;
>>  }
> 
> this change misses a declaration
> 
> struct device_node *np = client->dev.of_node;

Good catch, technically the whole of_property_read_bool() could be
dropped from rk808_remove() since unregister_restart_handler() survives
if handler wasn't registered.
Peter Geis Dec. 20, 2021, 5:07 p.m. UTC | #4 
On Mon, Dec 20, 2021 at 11:36 AM Dmitry Osipenko <digetx@gmail.com> wrote:
>
> 20.12.2021 19:33, Frank Wunderlich пишет:
> > Hi
> >
> >> Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
> >> Von: "Peter Geis" <pgwipeout@gmail.com>
> >> @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client *client)
> >>      if (pm_power_off == rk808_pm_power_off)
> >>              pm_power_off = NULL;
> >>
> >> +    if (of_property_read_bool(np, "rockchip,system-power-controller"))
> >> +            unregister_restart_handler(&rk808_restart_handler);
> >> +
> >>      return 0;
> >>  }
> >
> > this change misses a declaration
> >
> > struct device_node *np = client->dev.of_node;
>
> Good catch, technically the whole of_property_read_bool() could be
> dropped from rk808_remove() since unregister_restart_handler() survives
> if handler wasn't registered.

Thank you all!
Lee Jones Dec. 21, 2021, 8:48 a.m. UTC | #5 
On Mon, 20 Dec 2021, Frank Wunderlich wrote:

> Hi
> 
> > Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
> > Von: "Peter Geis" <pgwipeout@gmail.com>
> > @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client *client)
> >  	if (pm_power_off == rk808_pm_power_off)
> >  		pm_power_off = NULL;
> >
> > +	if (of_property_read_bool(np, "rockchip,system-power-controller"))
> > +		unregister_restart_handler(&rk808_restart_handler);
> > +
> >  	return 0;
> >  }
> 
> this change misses a declaration
> 
> struct device_node *np = client->dev.of_node;

How did this compile when you tested it?
Frank Wunderlich Dec. 21, 2021, 9:10 a.m. UTC | #6 
Am 21. Dezember 2021 09:48:43 MEZ schrieb Lee Jones <lee.jones@linaro.org>:
>On Mon, 20 Dec 2021, Frank Wunderlich wrote:
>
>> Hi
>> 
>> > Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
>> > Von: "Peter Geis" <pgwipeout@gmail.com>
>> > @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client
>*client)
>> >  	if (pm_power_off == rk808_pm_power_off)
>> >  		pm_power_off = NULL;
>> >
>> > +	if (of_property_read_bool(np,
>"rockchip,system-power-controller"))
>> > +		unregister_restart_handler(&rk808_restart_handler);
>> > +
>> >  	return 0;
>> >  }
>> 
>> this change misses a declaration
>> 
>> struct device_node *np = client->dev.of_node;
>
>How did this compile when you tested it?

Here i have squashed the change in:

https://github.com/frank-w/BPI-R2-4.14/commit/06430ffcb6d58d33014fb940256de77807ed620f

With the change i can compile it...

But in v4 (patch is tagged as v3 too) the of_property_read_bool was dropped completely.
regards Frank
Lee Jones Dec. 22, 2021, 11:09 a.m. UTC | #7 
On Tue, 21 Dec 2021, Frank Wunderlich wrote:

> Am 21. Dezember 2021 09:48:43 MEZ schrieb Lee Jones <lee.jones@linaro.org>:
> >On Mon, 20 Dec 2021, Frank Wunderlich wrote:
> >
> >> Hi
> >> 
> >> > Gesendet: Montag, 20. Dezember 2021 um 15:46 Uhr
> >> > Von: "Peter Geis" <pgwipeout@gmail.com>
> >> > @@ -749,6 +791,9 @@ static int rk808_remove(struct i2c_client
> >*client)
> >> >  	if (pm_power_off == rk808_pm_power_off)
> >> >  		pm_power_off = NULL;
> >> >
> >> > +	if (of_property_read_bool(np,
> >"rockchip,system-power-controller"))
> >> > +		unregister_restart_handler(&rk808_restart_handler);
> >> > +
> >> >  	return 0;
> >> >  }
> >> 
> >> this change misses a declaration
> >> 
> >> struct device_node *np = client->dev.of_node;
> >
> >How did this compile when you tested it?
> 
> Here i have squashed the change in:
> 
> https://github.com/frank-w/BPI-R2-4.14/commit/06430ffcb6d58d33014fb940256de77807ed620f
> 
> With the change i can compile it...

Not sure I understand.

Please make sure all patches you send for inclusion into the Linux
kernel are fully tested.  They should also be bisectable i.e. not
depend on patches applied *on top*.

> But in v4 (patch is tagged as v3 too) the of_property_read_bool was dropped completely.
> regards Frank
Frank Wunderlich Dec. 22, 2021, 11:31 a.m. UTC | #8 
> Gesendet: Mittwoch, 22. Dezember 2021 um 12:09 Uhr
> Von: "Lee Jones" <lee.jones@linaro.org>
> An: "Frank Wunderlich" <frank-w@public-files.de>
> > Here i have squashed the change in:
> >
> > https://github.com/frank-w/BPI-R2-4.14/commit/06430ffcb6d58d33014fb940256de77807ed620f
> >
> > With the change i can compile it...
>
> Not sure I understand.
>
> Please make sure all patches you send for inclusion into the Linux
> kernel are fully tested.  They should also be bisectable i.e. not
> depend on patches applied *on top*.
>
> > But in v4 (patch is tagged as v3 too) the of_property_read_bool was dropped completely.
> > regards Frank

only v1 was sent by me :)

v4 is compilable and works on rk809 (Bananapi r2 pro)

regards Frank
Lee Jones Dec. 22, 2021, 12:53 p.m. UTC | #9 
On Wed, 22 Dec 2021, Frank Wunderlich wrote:

> > Gesendet: Mittwoch, 22. Dezember 2021 um 12:09 Uhr
> > Von: "Lee Jones" <lee.jones@linaro.org>
> > An: "Frank Wunderlich" <frank-w@public-files.de>
> > > Here i have squashed the change in:
> > >
> > > https://github.com/frank-w/BPI-R2-4.14/commit/06430ffcb6d58d33014fb940256de77807ed620f
> > >
> > > With the change i can compile it...
> >
> > Not sure I understand.
> >
> > Please make sure all patches you send for inclusion into the Linux
> > kernel are fully tested.  They should also be bisectable i.e. not
> > depend on patches applied *on top*.
> >
> > > But in v4 (patch is tagged as v3 too) the of_property_read_bool was dropped completely.
> > > regards Frank
> 
> only v1 was sent by me :)
> 
> v4 is compilable and works on rk809 (Bananapi r2 pro)

My comments are directed at whoever sent patches without testing.
Peter Geis Dec. 22, 2021, 1:19 p.m. UTC | #10 
On Wed, Dec 22, 2021 at 7:54 AM Lee Jones <lee.jones@linaro.org> wrote:
>
> On Wed, 22 Dec 2021, Frank Wunderlich wrote:
>
> > > Gesendet: Mittwoch, 22. Dezember 2021 um 12:09 Uhr
> > > Von: "Lee Jones" <lee.jones@linaro.org>
> > > An: "Frank Wunderlich" <frank-w@public-files.de>
> > > > Here i have squashed the change in:
> > > >
> > > > https://github.com/frank-w/BPI-R2-4.14/commit/06430ffcb6d58d33014fb940256de77807ed620f
> > > >
> > > > With the change i can compile it...
> > >
> > > Not sure I understand.
> > >
> > > Please make sure all patches you send for inclusion into the Linux
> > > kernel are fully tested.  They should also be bisectable i.e. not
> > > depend on patches applied *on top*.
> > >
> > > > But in v4 (patch is tagged as v3 too) the of_property_read_bool was dropped completely.
> > > > regards Frank
> >
> > only v1 was sent by me :)
> >
> > v4 is compilable and works on rk809 (Bananapi r2 pro)
>
> My comments are directed at whoever sent patches without testing.

Apologies, due to an unfortunate set of circumstances I missed the
build failed and I was using a stale kernel.

>
> --
> Lee Jones [李琼斯]
> Senior Technical Lead - Developer Services
> Linaro.org │ Open source software for Arm SoCs
> Follow Linaro: Facebook | Twitter | Blog
diff mbox series

Patch

diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index b181fe401330..f3a79e23ac6e 100644
--- a/drivers/mfd/rk808.c
+++ b/drivers/mfd/rk808.c
@@ -19,6 +19,7 @@ 
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
+#include <linux/reboot.h>
 
 struct rk808_reg_data {
 	int addr;
@@ -543,6 +544,7 @@  static void rk808_pm_power_off(void)
 		reg = RK808_DEVCTRL_REG,
 		bit = DEV_OFF_RST;
 		break;
+	case RK809_ID:
 	case RK817_ID:
 		reg = RK817_SYS_CFG(3);
 		bit = DEV_OFF;
@@ -559,6 +561,34 @@  static void rk808_pm_power_off(void)
 		dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
 }
 
+static int rk808_restart_notify(struct notifier_block *this, unsigned long mode, void *cmd)
+{
+	int ret;
+	unsigned int reg, bit;
+	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+
+	switch (rk808->variant) {
+	case RK809_ID:
+	case RK817_ID:
+		reg = RK817_SYS_CFG(3);
+		bit = DEV_RST;
+		break;
+
+	default:
+		return NOTIFY_DONE;
+	}
+	ret = regmap_update_bits(rk808->regmap, reg, bit, bit);
+	if (ret)
+		dev_err(&rk808_i2c_client->dev, "Failed to restart device!\n");
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block rk808_restart_handler = {
+	.notifier_call = rk808_restart_notify,
+	.priority = 192,
+};
+
 static void rk8xx_shutdown(struct i2c_client *client)
 {
 	struct rk808 *rk808 = i2c_get_clientdata(client);
@@ -727,6 +757,18 @@  static int rk808_probe(struct i2c_client *client,
 	if (of_property_read_bool(np, "rockchip,system-power-controller")) {
 		rk808_i2c_client = client;
 		pm_power_off = rk808_pm_power_off;
+
+		switch (rk808->variant) {
+		case RK809_ID:
+		case RK817_ID:
+			ret = register_restart_handler(&rk808_restart_handler);
+			if (ret)
+				dev_warn(&client->dev, "failed to register restart handler, %d\n", ret);
+			break;
+		default:
+			dev_dbg(&client->dev, "pmic controlled board reset not supported\n");
+			break;
+		}
 	}
 
 	return 0;
@@ -749,6 +791,9 @@  static int rk808_remove(struct i2c_client *client)
 	if (pm_power_off == rk808_pm_power_off)
 		pm_power_off = NULL;
 
+	if (of_property_read_bool(np, "rockchip,system-power-controller"))
+		unregister_restart_handler(&rk808_restart_handler);
+
 	return 0;
 }
 
diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
index a96e6d43ca06..58602032e642 100644
--- a/include/linux/mfd/rk808.h
+++ b/include/linux/mfd/rk808.h
@@ -373,6 +373,7 @@  enum rk805_reg {
 #define SWITCH2_EN	BIT(6)
 #define SWITCH1_EN	BIT(5)
 #define DEV_OFF_RST	BIT(3)
+#define DEV_RST		BIT(2)
 #define DEV_OFF		BIT(0)
 #define RTC_STOP	BIT(0)