* [PATCHv2] regulator: s2mps11: Added shutdown function to poweroff
@ 2015-07-14 15:41 Anand Moon
2015-07-15 1:03 ` Krzysztof Kozlowski
0 siblings, 1 reply; 3+ messages in thread
From: Anand Moon @ 2015-07-14 15:41 UTC (permalink / raw)
To: Sangbeom Kim, Krzysztof Kozlowski, Marek Szyprowski,
Liam Girdwood, Mark Brown
Cc: linux-kernel, linux-samsung-soc, Anand Moon
Added .shutdown function to s2mps11 to help poweroff the board successfully.
s2mps11-pmic: S2MPS11_REG_CTRL1 reg value 16:00000000000000000000000000010000
The device driver clears the register to turn off the PMIC.
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
Console log for improper shutdown.
root@odroidxu3:~# poweroff
...
* Unmounting temporary filesystems... [ OK ]
* Deactivating swap... [ OK ]
* Unmounting local filesystems... [ OK ]
* Will now halt
[ 209.020280] reboot: Power down
[ 209.122039] Power down failed, please power off system manually.
Console log for proper shutdown.
root@odroidxu3:~# poweroff
...
* Unmounting temporary filesystems... [ OK ]
* Deactivating swap... [ OK ]
* Unmounting local filesystems... [ OK ]
* Will now halt
[ 476.283071] reboo
---
drivers/regulator/s2mps11.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index 326ffb5..823180e 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -1060,6 +1060,31 @@ out:
return ret;
}
+static void s2mps11_pmic_shutdown(struct platform_device *pdev)
+{
+ struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ unsigned int reg_val, ret;
+
+ ret = regmap_read(iodev->regmap_pmic, S2MPS11_REG_CTRL1, ®_val);
+ if (ret < 0) {
+ dev_crit(&pdev->dev, "could not read S2MPS11_REG_CTRL1 value\n");
+ } else {
+ /*
+ * s2mps11-pmic: S2MPS11_REG_CTRL1 reg value
+ * is 00000000000000000000000000010000
+ * clear the S2MPS11_REG_CTRL1 0x10 value to shutdown.
+ */
+ if (reg_val & BIT(4)) {
+ ret = regmap_update_bits(iodev->regmap_pmic,
+ S2MPS11_REG_CTRL1,
+ BIT(4), BIT(0));
+ if (ret)
+ dev_crit(&pdev->dev,
+ "could not write S2MPS11_REG_CTRL1 value\n");
+ }
+ }
+}
+
static const struct platform_device_id s2mps11_pmic_id[] = {
{ "s2mps11-pmic", S2MPS11X},
{ "s2mps13-pmic", S2MPS13X},
@@ -1074,6 +1099,7 @@ static struct platform_driver s2mps11_pmic_driver = {
.name = "s2mps11-pmic",
},
.probe = s2mps11_pmic_probe,
+ .shutdown = s2mps11_pmic_shutdown,
.id_table = s2mps11_pmic_id,
};
--
2.4.5
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCHv2] regulator: s2mps11: Added shutdown function to poweroff
2015-07-14 15:41 [PATCHv2] regulator: s2mps11: Added shutdown function to poweroff Anand Moon
@ 2015-07-15 1:03 ` Krzysztof Kozlowski
2015-07-15 2:42 ` Anand Moon
0 siblings, 1 reply; 3+ messages in thread
From: Krzysztof Kozlowski @ 2015-07-15 1:03 UTC (permalink / raw)
To: Anand Moon, Sangbeom Kim, Marek Szyprowski, Liam Girdwood,
Mark Brown
Cc: linux-kernel, linux-samsung-soc
On 15.07.2015 00:41, Anand Moon wrote:
> Added .shutdown function to s2mps11 to help poweroff the board successfully.
Which board does not poweroff? The PMIC is used on multiple boards, did
you observed this on all of them?
>
> s2mps11-pmic: S2MPS11_REG_CTRL1 reg value 16:00000000000000000000000000010000
>
> The device driver clears the register to turn off the PMIC.
This is not sufficient explanation for commit message.
I already raised concerns that this does not look to me as a proper way
of doing poweroff. Unfortunately you did not resolved these concerns.
The main questions are unanswered: Why you have to do this and why
"standard" way does not work?
How can you properly fix some problem if you don't know the cause of
problem? It is blind shooting which may hurt other boards.
>
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
>
> ---
> Console log for improper shutdown.
> root@odroidxu3:~# poweroff
> ...
> * Unmounting temporary filesystems... [ OK ]
> * Deactivating swap... [ OK ]
> * Unmounting local filesystems... [ OK ]
> * Will now halt
> [ 209.020280] reboot: Power down
> [ 209.122039] Power down failed, please power off system manually.
>
> Console log for proper shutdown.
> root@odroidxu3:~# poweroff
> ...
> * Unmounting temporary filesystems... [ OK ]
> * Deactivating swap... [ OK ]
> * Unmounting local filesystems... [ OK ]
> * Will now halt
> [ 476.283071] reboo
> ---
> drivers/regulator/s2mps11.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
> index 326ffb5..823180e 100644
> --- a/drivers/regulator/s2mps11.c
> +++ b/drivers/regulator/s2mps11.c
> @@ -1060,6 +1060,31 @@ out:
> return ret;
> }
>
> +static void s2mps11_pmic_shutdown(struct platform_device *pdev)
> +{
> + struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> + unsigned int reg_val, ret;
> +
> + ret = regmap_read(iodev->regmap_pmic, S2MPS11_REG_CTRL1, ®_val);
> + if (ret < 0) {
regmap_read() returns an int which you assign to an unsigned int which
then you compare against <0? This does not look good.
> + dev_crit(&pdev->dev, "could not read S2MPS11_REG_CTRL1 value\n");
> + } else {
> + /*
> + * s2mps11-pmic: S2MPS11_REG_CTRL1 reg value
> + * is 00000000000000000000000000010000
> + * clear the S2MPS11_REG_CTRL1 0x10 value to shutdown.
> + */
> + if (reg_val & BIT(4)) {
> + ret = regmap_update_bits(iodev->regmap_pmic,
> + S2MPS11_REG_CTRL1,
> + BIT(4), BIT(0));
I don't understand. You want to update BIT(4) but the value is BIT(0)?
This will clear BIT(4) but is totally unreadable.
> + if (ret)
> + dev_crit(&pdev->dev,
> + "could not write S2MPS11_REG_CTRL1 value\n");
> + }
> + }
The code is not readable, to many unnecessary indentations.
> +}
> +
> static const struct platform_device_id s2mps11_pmic_id[] = {
> { "s2mps11-pmic", S2MPS11X},
> { "s2mps13-pmic", S2MPS13X},
> @@ -1074,6 +1099,7 @@ static struct platform_driver s2mps11_pmic_driver = {
> .name = "s2mps11-pmic",
> },
> .probe = s2mps11_pmic_probe,
> + .shutdown = s2mps11_pmic_shutdown,
The purpose of shutdown function is not to shutdown the system but to
prepare the system for shutdown.
The patch is just wrong and you did not answered the major question -
WHY you have to do this? Don't fix the problem blindly (or because some
hardkernel tree for some of the boards use such patch).
Best regards,
Krzysztof
> .id_table = s2mps11_pmic_id,
> };
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCHv2] regulator: s2mps11: Added shutdown function to poweroff
2015-07-15 1:03 ` Krzysztof Kozlowski
@ 2015-07-15 2:42 ` Anand Moon
0 siblings, 0 replies; 3+ messages in thread
From: Anand Moon @ 2015-07-15 2:42 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Sangbeom Kim, Marek Szyprowski, Liam Girdwood, Mark Brown,
Linux Kernel, linux-samsung-soc@vger.kernel.org
hi Krzysztof,
On 15 July 2015 at 06:33, Krzysztof Kozlowski <k.kozlowski@samsung.com> wrote:
> On 15.07.2015 00:41, Anand Moon wrote:
>> Added .shutdown function to s2mps11 to help poweroff the board successfully.
>
> Which board does not poweroff? The PMIC is used on multiple boards, did
> you observed this on all of them?
>
>>
>> s2mps11-pmic: S2MPS11_REG_CTRL1 reg value 16:00000000000000000000000000010000
>>
>> The device driver clears the register to turn off the PMIC.
>
> This is not sufficient explanation for commit message.
>
> I already raised concerns that this does not look to me as a proper way
> of doing poweroff. Unfortunately you did not resolved these concerns.
>
> The main questions are unanswered: Why you have to do this and why
> "standard" way does not work?
> How can you properly fix some problem if you don't know the cause of
> problem? It is blind shooting which may hurt other boards.
>
>
>>
>> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
>>
>> ---
>> Console log for improper shutdown.
>> root@odroidxu3:~# poweroff
>> ...
>> * Unmounting temporary filesystems... [ OK ]
>> * Deactivating swap... [ OK ]
>> * Unmounting local filesystems... [ OK ]
>> * Will now halt
>> [ 209.020280] reboot: Power down
>> [ 209.122039] Power down failed, please power off system manually.
>>
>> Console log for proper shutdown.
>> root@odroidxu3:~# poweroff
>> ...
>> * Unmounting temporary filesystems... [ OK ]
>> * Deactivating swap... [ OK ]
>> * Unmounting local filesystems... [ OK ]
>> * Will now halt
>> [ 476.283071] reboo
>> ---
>> drivers/regulator/s2mps11.c | 26 ++++++++++++++++++++++++++
>> 1 file changed, 26 insertions(+)
>>
>> diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
>> index 326ffb5..823180e 100644
>> --- a/drivers/regulator/s2mps11.c
>> +++ b/drivers/regulator/s2mps11.c
>> @@ -1060,6 +1060,31 @@ out:
>> return ret;
>> }
>>
>> +static void s2mps11_pmic_shutdown(struct platform_device *pdev)
>> +{
>> + struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
>> + unsigned int reg_val, ret;
>> +
>> + ret = regmap_read(iodev->regmap_pmic, S2MPS11_REG_CTRL1, ®_val);
>> + if (ret < 0) {
>
> regmap_read() returns an int which you assign to an unsigned int which
> then you compare against <0? This does not look good.
>
>> + dev_crit(&pdev->dev, "could not read S2MPS11_REG_CTRL1 value\n");
>> + } else {
>> + /*
>> + * s2mps11-pmic: S2MPS11_REG_CTRL1 reg value
>> + * is 00000000000000000000000000010000
>> + * clear the S2MPS11_REG_CTRL1 0x10 value to shutdown.
>> + */
>> + if (reg_val & BIT(4)) {
>> + ret = regmap_update_bits(iodev->regmap_pmic,
>> + S2MPS11_REG_CTRL1,
>> + BIT(4), BIT(0));
>
> I don't understand. You want to update BIT(4) but the value is BIT(0)?
> This will clear BIT(4) but is totally unreadable.
>
>> + if (ret)
>> + dev_crit(&pdev->dev,
>> + "could not write S2MPS11_REG_CTRL1 value\n");
>> + }
>> + }
>
> The code is not readable, to many unnecessary indentations.
>
>> +}
>> +
>> static const struct platform_device_id s2mps11_pmic_id[] = {
>> { "s2mps11-pmic", S2MPS11X},
>> { "s2mps13-pmic", S2MPS13X},
>> @@ -1074,6 +1099,7 @@ static struct platform_driver s2mps11_pmic_driver = {
>> .name = "s2mps11-pmic",
>> },
>> .probe = s2mps11_pmic_probe,
>> + .shutdown = s2mps11_pmic_shutdown,
>
> The purpose of shutdown function is not to shutdown the system but to
> prepare the system for shutdown.
>
> The patch is just wrong and you did not answered the major question -
> WHY you have to do this? Don't fix the problem blindly (or because some
> hardkernel tree for some of the boards use such patch).
>
> Best regards,
> Krzysztof
>
>> .id_table = s2mps11_pmic_id,
>> };
>>
>>
>
I might me missing the bigger picture. So drop it.
-Anand Moon
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-07-14 15:41 [PATCHv2] regulator: s2mps11: Added shutdown function to poweroff Anand Moon
2015-07-15 1:03 ` Krzysztof Kozlowski
2015-07-15 2:42 ` Anand Moon
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