Add suspend-to-mem node to regulator core to be enabled or disabled
during system suspend and also support changing the regulator operating
mode during runtime and when the system enter sleep mode (stand by mode).
Cc: Marek Szyprowski <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Chanwoo Choi <[email protected]>
Signed-off-by: Anand Moon <[email protected]>
---
Current patch:
Note: Both microSD and eMMC suspend resume works this changes at my end.
regulator-off-in-suspend:
set the regulator node into suspend state i.e. standby mode during suspend
operation.
Current changes are based on
[0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
Regulators which can be turned off during system suspend:
-LDOn : 2, 6-8, 10-12, 14-16,
-BUCKn : 1-4.
Use standard regulator bindings for it ('regulator-off-in-suspend').
drop the suspend off binding which are not supported by the driver.
RFC version
[1] https://patchwork.kernel.org/patch/10810909/
These changes had some problem with eMMC not entering into suspend mode.
with some miss configuration in regulator-off-in-suspend mode.
Changes from previos patch.
[2] https://patchwork.kernel.org/patch/10712549/
Set all the non used regulator in suspend-odd state
LD02, LD03, LD05, LD06, LD07, LD011, LD013, LDO14, LD016
BUCK5, BUCK6, BUCK7 and not confirable as per driver max77686-regulator
---
.../boot/dts/exynos4412-odroid-common.dtsi | 39 +++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index 08d3a0a7b4eb..375156ad5454 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
@@ -288,6 +288,9 @@
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo3_reg: LDO3 {
@@ -317,6 +320,9 @@
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-always-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo7_reg: LDO7 {
@@ -324,18 +330,27 @@
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-always-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo8_reg: LDO8 {
regulator-name = "VDD10_HDMI_1.0V";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo10_reg: LDO10 {
regulator-name = "VDDQ_MIPIHSI_1.8V";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo11_reg: LDO11 {
@@ -343,6 +358,9 @@
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo12_reg: LDO12 {
@@ -351,6 +369,9 @@
regulator-max-microvolt = <3300000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo13_reg: LDO13 {
@@ -367,6 +388,9 @@
regulator-max-microvolt = <1800000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo15_reg: LDO15 {
@@ -375,6 +399,9 @@
regulator-max-microvolt = <1000000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo16_reg: LDO16 {
@@ -383,6 +410,9 @@
regulator-max-microvolt = <1800000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
ldo20_reg: LDO20 {
@@ -421,6 +451,9 @@
regulator-max-microvolt = <1100000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
buck2_reg: BUCK2 {
@@ -437,6 +470,9 @@
regulator-max-microvolt = <1050000>;
regulator-always-on;
regulator-boot-on;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
buck4_reg: BUCK4 {
@@ -444,6 +480,9 @@
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1100000>;
regulator-microvolt-offset = <50000>;
+ regulator-state-mem {
+ regulator-off-in-suspend;
+ };
};
buck5_reg: BUCK5 {
--
2.21.0
On Sun, 24 Mar 2019 at 09:33, Anand Moon <[email protected]> wrote:
>
> Add suspend-to-mem node to regulator core to be enabled or disabled
> during system suspend and also support changing the regulator operating
> mode during runtime and when the system enter sleep mode (stand by mode).
>
> Cc: Marek Szyprowski <[email protected]>
> Cc: Krzysztof Kozlowski <[email protected]>
> Cc: Chanwoo Choi <[email protected]>
> Signed-off-by: Anand Moon <[email protected]>
> ---
> Current patch:
>
> Note: Both microSD and eMMC suspend resume works this changes at my end.
>
> regulator-off-in-suspend:
> set the regulator node into suspend state i.e. standby mode during suspend
> operation.
>
> Current changes are based on
> [0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
>
> Regulators which can be turned off during system suspend:
> -LDOn : 2, 6-8, 10-12, 14-16,
> -BUCKn : 1-4.
> Use standard regulator bindings for it ('regulator-off-in-suspend').
>
> drop the suspend off binding which are not supported by the driver.
>
> RFC version
> [1] https://patchwork.kernel.org/patch/10810909/
> These changes had some problem with eMMC not entering into suspend mode.
> with some miss configuration in regulator-off-in-suspend mode.
>
> Changes from previos patch.
> [2] https://patchwork.kernel.org/patch/10712549/
>
> Set all the non used regulator in suspend-odd state
> LD02, LD03, LD05, LD06, LD07, LD011, LD013, LDO14, LD016
>
> BUCK5, BUCK6, BUCK7 and not confirable as per driver max77686-regulator
> ---
> .../boot/dts/exynos4412-odroid-common.dtsi | 39 +++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> index 08d3a0a7b4eb..375156ad5454 100644
> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> @@ -288,6 +288,9 @@
> regulator-min-microvolt = <1800000>;
> regulator-max-microvolt = <1800000>;
> regulator-always-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
Please maintain proper versioning of patches.
First patch sent to lists should be either RFC or v1. Second
release/submission is then always v2. Third v3.
This is third or fourth submission but you marked it as v1. This makes
it very difficult to discuss and reference previous versions.
The commit message did not change since beginning (first version). I
asked twice that you need to explain exactly why you put the the
regulator to off or on state in suspend. Why?
Because:
1. This change looks without justification - once you put on, then you
put off, now again on,
2. Anyone reading the code later must know the rationale why this was done,
3. I am not quite sure whether this is good setting so I would be
happy to be convinced.
How to provide such explanation? The best in commit message. Sometimes
in the comment in the code, depends.
How such explanation could look like? For example like this:
f8f3b7fc21b1 ("ARM: dts: exynos: Fix regulators configuration on Peach
Pi/Pit Chromebooks")
Marek clearly explained why he put the regulators "always-on", even
tough we do not know everything about this. More over, he mentions
that this fixes specific issue.
Summarizing, please answer:
1. Why this is made off-in-suspend?
2. Why this can be made off-in-suspend?
> + };
> };
>
> ldo3_reg: LDO3 {
> @@ -317,6 +320,9 @@
> regulator-min-microvolt = <1000000>;
> regulator-max-microvolt = <1000000>;
> regulator-always-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo7_reg: LDO7 {
> @@ -324,18 +330,27 @@
> regulator-min-microvolt = <1000000>;
> regulator-max-microvolt = <1000000>;
> regulator-always-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo8_reg: LDO8 {
> regulator-name = "VDD10_HDMI_1.0V";
> regulator-min-microvolt = <1000000>;
> regulator-max-microvolt = <1000000>;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo10_reg: LDO10 {
> regulator-name = "VDDQ_MIPIHSI_1.8V";
> regulator-min-microvolt = <1800000>;
> regulator-max-microvolt = <1800000>;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo11_reg: LDO11 {
> @@ -343,6 +358,9 @@
> regulator-min-microvolt = <1800000>;
> regulator-max-microvolt = <1800000>;
> regulator-always-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo12_reg: LDO12 {
> @@ -351,6 +369,9 @@
> regulator-max-microvolt = <3300000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo13_reg: LDO13 {
> @@ -367,6 +388,9 @@
> regulator-max-microvolt = <1800000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo15_reg: LDO15 {
> @@ -375,6 +399,9 @@
> regulator-max-microvolt = <1000000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo16_reg: LDO16 {
> @@ -383,6 +410,9 @@
> regulator-max-microvolt = <1800000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> ldo20_reg: LDO20 {
> @@ -421,6 +451,9 @@
> regulator-max-microvolt = <1100000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
I questioned this change two times. You did not answer to my
question... If you turn memory bus regulator off, how the memory will
work in Suspend-to-Memory mode? I might be missing here something but
it just looks suspicious. Maybe the regulator does not supply the
memory itself (so refresh works even when it is down), just the
interface? I don't know, it just looks suspicious. I need to see
proper explanation.
I am sorry but I will not check other hunks in this patch. Please
provide the answers for all my questions here first.
Best regards,
Krzysztof
>
> buck2_reg: BUCK2 {
> @@ -437,6 +470,9 @@
> regulator-max-microvolt = <1050000>;
> regulator-always-on;
> regulator-boot-on;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> buck4_reg: BUCK4 {
> @@ -444,6 +480,9 @@
> regulator-min-microvolt = <900000>;
> regulator-max-microvolt = <1100000>;
> regulator-microvolt-offset = <50000>;
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> };
>
> buck5_reg: BUCK5 {
> --
> 2.21.0
>
On Mon, 25 Mar 2019 at 13:46, Krzysztof Kozlowski <[email protected]> wrote:
>
> On Sun, 24 Mar 2019 at 09:33, Anand Moon <[email protected]> wrote:
> >
> > Add suspend-to-mem node to regulator core to be enabled or disabled
> > during system suspend and also support changing the regulator operating
> > mode during runtime and when the system enter sleep mode (stand by mode).
> >
> > Cc: Marek Szyprowski <[email protected]>
> > Cc: Krzysztof Kozlowski <[email protected]>
> > Cc: Chanwoo Choi <[email protected]>
> > Signed-off-by: Anand Moon <[email protected]>
> > ---
> > Current patch:
> >
> > Note: Both microSD and eMMC suspend resume works this changes at my end.
> >
> > regulator-off-in-suspend:
> > set the regulator node into suspend state i.e. standby mode during suspend
> > operation.
> >
> > Current changes are based on
> > [0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
> >
> > Regulators which can be turned off during system suspend:
> > -LDOn : 2, 6-8, 10-12, 14-16,
> > -BUCKn : 1-4.
> > Use standard regulator bindings for it ('regulator-off-in-suspend').
> >
> > drop the suspend off binding which are not supported by the driver.
> >
> > RFC version
> > [1] https://patchwork.kernel.org/patch/10810909/
> > These changes had some problem with eMMC not entering into suspend mode.
> > with some miss configuration in regulator-off-in-suspend mode.
> >
> > Changes from previos patch.
> > [2] https://patchwork.kernel.org/patch/10712549/
> >
> > Set all the non used regulator in suspend-odd state
> > LD02, LD03, LD05, LD06, LD07, LD011, LD013, LDO14, LD016
> >
> > BUCK5, BUCK6, BUCK7 and not confirable as per driver max77686-regulator
> > ---
> > .../boot/dts/exynos4412-odroid-common.dtsi | 39 +++++++++++++++++++
> > 1 file changed, 39 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > index 08d3a0a7b4eb..375156ad5454 100644
> > --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > @@ -288,6 +288,9 @@
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
>
> Please maintain proper versioning of patches.
> First patch sent to lists should be either RFC or v1. Second
> release/submission is then always v2. Third v3.
>
> This is third or fourth submission but you marked it as v1. This makes
> it very difficult to discuss and reference previous versions.
>
> The commit message did not change since beginning (first version). I
> asked twice that you need to explain exactly why you put the the
> regulator to off or on state in suspend. Why?
> Because:
> 1. This change looks without justification - once you put on, then you
> put off, now again on,
> 2. Anyone reading the code later must know the rationale why this was done,
> 3. I am not quite sure whether this is good setting so I would be
> happy to be convinced.
>
> How to provide such explanation? The best in commit message. Sometimes
> in the comment in the code, depends.
> How such explanation could look like? For example like this:
> f8f3b7fc21b1 ("ARM: dts: exynos: Fix regulators configuration on Peach
> Pi/Pit Chromebooks")
> Marek clearly explained why he put the regulators "always-on", even
> tough we do not know everything about this. More over, he mentions
> that this fixes specific issue.
>
> Summarizing, please answer:
> 1. Why this is made off-in-suspend?
> 2. Why this can be made off-in-suspend?
>
> > + };
> > };
> >
> > ldo3_reg: LDO3 {
> > @@ -317,6 +320,9 @@
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo7_reg: LDO7 {
> > @@ -324,18 +330,27 @@
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo8_reg: LDO8 {
> > regulator-name = "VDD10_HDMI_1.0V";
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo10_reg: LDO10 {
> > regulator-name = "VDDQ_MIPIHSI_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo11_reg: LDO11 {
> > @@ -343,6 +358,9 @@
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo12_reg: LDO12 {
> > @@ -351,6 +369,9 @@
> > regulator-max-microvolt = <3300000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo13_reg: LDO13 {
> > @@ -367,6 +388,9 @@
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo15_reg: LDO15 {
> > @@ -375,6 +399,9 @@
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo16_reg: LDO16 {
> > @@ -383,6 +410,9 @@
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo20_reg: LDO20 {
> > @@ -421,6 +451,9 @@
> > regulator-max-microvolt = <1100000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
>
> I questioned this change two times. You did not answer to my
> question... If you turn memory bus regulator off, how the memory will
> work in Suspend-to-Memory mode? I might be missing here something but
> it just looks suspicious. Maybe the regulator does not supply the
> memory itself (so refresh works even when it is down), just the
> interface? I don't know, it just looks suspicious. I need to see
> proper explanation.
>
> I am sorry but I will not check other hunks in this patch. Please
> provide the answers for all my questions here first.
I started digging around this and datasheet describes the regulator
values in sleep mode. The MIF can be off if C2C is not used. It seems
that the memory refresh is provided by CKEM regulators (which you
wanted to turn off in first version of the patch). I am not happy that
I ask about such information and cannot get it. It is the job of
submitter to provide rationale.
Best regards,
Krzysztof
Hi Krzysztof,
Thanks your for your valuable comments.
I will try to answer your queries to best of my knowledge.
On Mon, 25 Mar 2019 at 18:16, Krzysztof Kozlowski <[email protected]> wrote:
>
> On Sun, 24 Mar 2019 at 09:33, Anand Moon <[email protected]> wrote:
> >
> > Add suspend-to-mem node to regulator core to be enabled or disabled
> > during system suspend and also support changing the regulator operating
> > mode during runtime and when the system enter sleep mode (stand by mode).
> >
> > Cc: Marek Szyprowski <[email protected]>
> > Cc: Krzysztof Kozlowski <[email protected]>
> > Cc: Chanwoo Choi <[email protected]>
> > Signed-off-by: Anand Moon <[email protected]>
> > ---
> > Current patch:
> >
> > Note: Both microSD and eMMC suspend resume works this changes at my end.
> >
> > regulator-off-in-suspend:
> > set the regulator node into suspend state i.e. standby mode during suspend
> > operation.
> >
> > Current changes are based on
> > [0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
> >
> > Regulators which can be turned off during system suspend:
> > -LDOn : 2, 6-8, 10-12, 14-16,
> > -BUCKn : 1-4.
> > Use standard regulator bindings for it ('regulator-off-in-suspend').
> >
> > drop the suspend off binding which are not supported by the driver.
> >
> > RFC version
> > [1] https://patchwork.kernel.org/patch/10810909/
> > These changes had some problem with eMMC not entering into suspend mode.
> > with some miss configuration in regulator-off-in-suspend mode.
> >
> > Changes from previos patch.
> > [2] https://patchwork.kernel.org/patch/10712549/
> >
> > Set all the non used regulator in suspend-odd state
> > LD02, LD03, LD05, LD06, LD07, LD011, LD013, LDO14, LD016
> >
> > BUCK5, BUCK6, BUCK7 and not confirable as per driver max77686-regulator
> > ---
> > .../boot/dts/exynos4412-odroid-common.dtsi | 39 +++++++++++++++++++
> > 1 file changed, 39 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > index 08d3a0a7b4eb..375156ad5454 100644
> > --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > @@ -288,6 +288,9 @@
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
>
> Please maintain proper versioning of patches.
> First patch sent to lists should be either RFC or v1. Second
> release/submission is then always v2. Third v3.
I tried to mixed up some changes that's the reason.
Ok if needed next version will be Patch V3.
>
> This is third or fourth submission but you marked it as v1. This makes
> it very difficult to discuss and reference previous versions.
>
> The commit message did not change since beginning (first version). I
> asked twice that you need to explain exactly why you put the the
> regulator to off or on state in suspend. Why?
> Because:
> 1. This change looks without justification - once you put on, then you
> put off, now again on,
> 2. Anyone reading the code later must know the rationale why this was done,
> 3. I am not quite sure whether this is good setting so I would be
> happy to be convinced.
>
Like I mention in the patch summary that this.
Current changes are based on
[0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
Regulators which can be turned off during system suspend:
-LDOn : 2, 6-8, 10-12, 14-16,
-BUCKn : 1-4.
Use standard regulator bindings for it ('regulator-off-in-suspend').
> How to provide such explanation? The best in commit message. Sometimes
> in the comment in the code, depends.
Ok I have been testing with following regulator debug prints to catch error.
[0] max77686-regulator.patch
below is the console logs during suspend and resume.
-------------------------------------------------------------------------------
Last login: Sat Mar 23 18:22:46 on ttySAC1
[root@archl-u3e ~]# echo no > /sys/module/printk/parameters/console_suspend
[root@archl-u3e ~]# rtcwake -d /dev/rtc0 -m mem -s 10
rtcwake: wakeup from "mem" using /dev/rtc0 at Sat Mar 23 19:56:17 2019
[ 38.595854] PM: suspend entry (deep)
[ 38.596603] PM: Syncing filesystems ... done.
[ 38.629351] Freezing user space processes ... (elapsed 0.002 seconds) done.
[ 38.633192] OOM killer disabled.
[ 38.636035] Freezing remaining freezable tasks ... (elapsed 0.001
seconds) done.
[ 38.675059] smsc95xx 1-2:1.0 eth0: entering SUSPEND2 mode
[ 38.753120] dwc2 12480000.hsotg: suspending usb gadget g_ether
[ 38.754007] dwc2 12480000.hsotg: new device is full-speed
[ 38.758960] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 38.765507] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 38.774050] wake enabled for irq 119
[ 38.775761] BUCK9: No configuration
[ 38.779191] BUCK8_P3V3: No configuration
[ 38.782852] BUCK7_2.0V: No configuration
[ 38.786851] BUCK6_1.35V: No configuration
[ 38.790752] VDDQ_CKEM1_2_1.2V: No configuration
[ 38.796220] BUCK4: regulator suspend disable supported
[ 38.800769] BUCK3: regulator suspend disable supported
[ 38.806002] BUCK1: regulator suspend disable supported
[ 38.810644] LDO26: No configuration
[ 38.814169] VDDQ_LCD_1.8V: No configuration
[ 38.818267] LDO24: No configuration
[ 38.821732] LDO23: No configuration
[ 38.825262] LDO22_VDDQ_MMC4_2.8V: No configuration
[ 38.829992] TFLASH_2.8V: No configuration
[ 38.834040] LDO20_1.8V: No configuration
[ 38.837883] LDO19: No configuration
[ 38.841349] LDO18: No configuration
[ 38.844878] LDO17: No configuration
[ 38.848667] LDO16: regulator suspend disable supported
[ 38.853889] LDO15: regulator suspend disable supported
[ 38.858931] LDO14: regulator suspend disable supported
[ 38.863771] VDDQ_C2C_W_1.8V: No configuration
[ 38.868378] LDO12: regulator suspend disable supported
[ 38.873508] LDO11: regulator suspend disable supported
[ 38.878545] LDO10: regulator suspend disable supported
[ 38.883384] LDO9: No configuration
[ 38.887190] LDO8: regulator suspend disable supported
[ 38.892168] LDO7: regulator suspend disable supported
[ 38.897279] LDO6: regulator suspend disable supported
[ 38.901872] VDDQ_MMC1_3_1.8V: No configuration
[ 38.906363] VDDQ_MMC2_2.8V: No configuration
[ 38.910541] VDDQ_EXT_1.8V: No configuration
[ 38.915134] LDO2: regulator suspend disable supported
[ 38.919753] VDD_ALIVE_1.0V: No configuration
[ 38.935229] usb3503 0-0008: switched to STANDBY mode
[ 38.935981] wake enabled for irq 123
[ 38.955192] samsung-pinctrl 11000000.pinctrl: Setting external
wakeup interrupt mask: 0xfbfff7ff
[ 38.975448] Disabling non-boot CPUs ...
[ 39.029279] s3c2410-wdt 10060000.watchdog: watchdog disabled
[ 39.029576] wake disabled for irq 123
[ 39.044319] usb3503 0-0008: switched to HUB mode
[ 39.144089] wake disabled for irq 119
[ 39.144812] dwc2 12480000.hsotg: resuming usb gadget g_ether
[ 39.422626] usb 1-2: reset high-speed USB device number 2 using exynos-ehci
[ 39.774632] usb 1-3: reset high-speed USB device number 3 using exynos-ehci
[ 40.106478] OOM killer enabled.
[ 40.106609] Restarting tasks ... done.
[ 40.111100] PM: suspend exit
[ 40.124058] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot
req 400000Hz, actual 396825HZ div = 63)
[root@archl-u3e ~]# [ 40.364705] mmc_host mmc1: Bus speed (slot 0) =
50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0)
[ 41.220200] smsc95xx 1-2:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
-------------------------------------------------------------------------------
> How such explanation could look like? For example like this:
> f8f3b7fc21b1 ("ARM: dts: exynos: Fix regulators configuration on Peach
> Pi/Pit Chromebooks")
> Marek clearly explained why he put the regulators "always-on", even
> tough we do not know everything about this. More over, he mentions
> that this fixes specific issue.
>
Thanks but I am not the expert here in general with regulator on/off.
I will add comment if needed explain in more detail.
[snip]
> Summarizing, please answer:
> 1. Why this is made off-in-suspend?
> 2. Why this can be made off-in-suspend?
>
On MAX77686A PMIC. (some quote from the datasheet).
Power ON/OFF by PWRREQ in PMIC=ON sequence is only effective when ON/OFF
on all regulators above are assigned by PWRREQ=H/L.
All programming must be done before the AP enters the sleep mode by
pulling PWRREQ low since
the AP does not have programming capability in (deep) sleep mode.
*Regulator are not really turned off but set into IDLE / Standby
state too be restored to Normal state*
Power summary in image : [1] https://imgur.com/gallery/l74kliX
Power Summary for MAX77686A of the regulator support PWRREQ
Power Default ON | ON/OFF
--------------------------------------
BUCK1 | ON | PWRREQ or I2C
BUCK2 | ON | PWRREQ or I2C
BUCK3 | ON | PWRREQ or I2C
BUCK4 | ON | PWREWQ or I2C
BUCK5 | ON | I2C
BUCK6 | ON | I2C
BUCK7 | ON | I2C
BUCK8 | OFF | I2C or ENB8 The external enable/disable pin, ENB8
BUCK9 | OFF | I2C or ENB9 The external enable/disable pin, ENB9
LDO1 | ON | I2C
LDO2 | ON | PWRREQ or I2C
LDO3 | ON | I2C
LDO4 | ON | I2C
LDO5 | ON | I2C
LDO6 | ON | PWRREQ or I2C
LDO7 | ON | PWRREQ or I2C
LDO8 | ON | PWRREQ or I2C
LDO9 | OFF | I2C
LDO10 | ON | PWRREQ or I2C
LDO11 | ON | PWRREQ or I2C
LDO12 | ON | PWRREQ or I2C
LDO13 | ON | I2C
LDO14 | ON | PWRREQ or I2C
LDO15 | ON | PWRREQ or I2C
LDO16 | ON | PWRREQ or I2C
LDO17 | OFF | I2C
LDO18 | OFF | I2C
LDO19 | OFF | I2C
LDO20 | OFF | I2C OR ENL20 ENL20, external enable/disable pin
LDO21 | OFF | I2C OR ENL21 ENL21, external enable/disable pin
LDO22 | OFF | I2C OR ENL22 ENL22, external enable/disable pin
LDO23 | OFF | I2C
LDO24 | OFF | I2C
LDO25 | OFF | I2C
LDO26 | OFF | I2C
> > ldo20_reg: LDO20 {
> > @@ -421,6 +451,9 @@
> > regulator-max-microvolt = <1100000>;
> > regulator-always-on;
> > regulator-boot-on;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
>
> I questioned this change two times. You did not answer to my
> question... If you turn memory bus regulator off, how the memory will
> work in Suspend-to-Memory mode? I might be missing here something but
> it just looks suspicious. Maybe the regulator does not supply the
> memory itself (so refresh works even when it is down), just the
> interface? I don't know, it just looks suspicious. I need to see
> proper explanation.
>
> I am sorry but I will not check other hunks in this patch. Please
> provide the answers for all my questions here first.
>
As per above table of MAX77686 PWRREQ capabilities regulator nodes
can be turned off during suspend reset of them remain on during suspend.
> Best regards,
> Krzysztof
>
We could monitor the regulator states via sys filesystem and also
using below tool
https://git.linaro.org/power/powerdebug.git
I have tried to summaries the feature required for this patch.
some of which I have overlooked earlier before sending the patch.
I am really poor in english for transform / interpreter the technical details
required at for your queries. But I will try to improve my self in the future.
Best Regards
-Anand
On Tue, 26 Mar 2019 at 11:35, Anand Moon <[email protected]> wrote:
(...)
> > This is third or fourth submission but you marked it as v1. This makes
> > it very difficult to discuss and reference previous versions.
> >
> > The commit message did not change since beginning (first version). I
> > asked twice that you need to explain exactly why you put the the
> > regulator to off or on state in suspend. Why?
> > Because:
> > 1. This change looks without justification - once you put on, then you
> > put off, now again on,
> > 2. Anyone reading the code later must know the rationale why this was done,
> > 3. I am not quite sure whether this is good setting so I would be
> > happy to be convinced.
> >
>
> Like I mention in the patch summary that this.
>
> Current changes are based on
> [0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
>
> Regulators which can be turned off during system suspend:
> -LDOn : 2, 6-8, 10-12, 14-16,
> -BUCKn : 1-4.
> Use standard regulator bindings for it ('regulator-off-in-suspend').
I do not see how this is related to my questions.
> > How to provide such explanation? The best in commit message. Sometimes
> > in the comment in the code, depends.
>
> Ok I have been testing with following regulator debug prints to catch error.
> [0] max77686-regulator.patch
>
> below is the console logs during suspend and resume.
> -------------------------------------------------------------------------------
> Last login: Sat Mar 23 18:22:46 on ttySAC1
> [root@archl-u3e ~]# echo no > /sys/module/printk/parameters/console_suspend
> [root@archl-u3e ~]# rtcwake -d /dev/rtc0 -m mem -s 10
> rtcwake: wakeup from "mem" using /dev/rtc0 at Sat Mar 23 19:56:17 2019
> [ 38.595854] PM: suspend entry (deep)
> [ 38.596603] PM: Syncing filesystems ... done.
> [ 38.629351] Freezing user space processes ... (elapsed 0.002 seconds) done.
> [ 38.633192] OOM killer disabled.
> [ 38.636035] Freezing remaining freezable tasks ... (elapsed 0.001
> seconds) done.
> [ 38.675059] smsc95xx 1-2:1.0 eth0: entering SUSPEND2 mode
> [ 38.753120] dwc2 12480000.hsotg: suspending usb gadget g_ether
> [ 38.754007] dwc2 12480000.hsotg: new device is full-speed
> [ 38.758960] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
> [ 38.765507] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
> [ 38.774050] wake enabled for irq 119
> [ 38.775761] BUCK9: No configuration
> [ 38.779191] BUCK8_P3V3: No configuration
> [ 38.782852] BUCK7_2.0V: No configuration
> [ 38.786851] BUCK6_1.35V: No configuration
> [ 38.790752] VDDQ_CKEM1_2_1.2V: No configuration
> [ 38.796220] BUCK4: regulator suspend disable supported
> [ 38.800769] BUCK3: regulator suspend disable supported
> [ 38.806002] BUCK1: regulator suspend disable supported
> [ 38.810644] LDO26: No configuration
> [ 38.814169] VDDQ_LCD_1.8V: No configuration
> [ 38.818267] LDO24: No configuration
> [ 38.821732] LDO23: No configuration
> [ 38.825262] LDO22_VDDQ_MMC4_2.8V: No configuration
> [ 38.829992] TFLASH_2.8V: No configuration
> [ 38.834040] LDO20_1.8V: No configuration
> [ 38.837883] LDO19: No configuration
> [ 38.841349] LDO18: No configuration
> [ 38.844878] LDO17: No configuration
> [ 38.848667] LDO16: regulator suspend disable supported
> [ 38.853889] LDO15: regulator suspend disable supported
> [ 38.858931] LDO14: regulator suspend disable supported
> [ 38.863771] VDDQ_C2C_W_1.8V: No configuration
> [ 38.868378] LDO12: regulator suspend disable supported
> [ 38.873508] LDO11: regulator suspend disable supported
> [ 38.878545] LDO10: regulator suspend disable supported
> [ 38.883384] LDO9: No configuration
> [ 38.887190] LDO8: regulator suspend disable supported
> [ 38.892168] LDO7: regulator suspend disable supported
> [ 38.897279] LDO6: regulator suspend disable supported
> [ 38.901872] VDDQ_MMC1_3_1.8V: No configuration
> [ 38.906363] VDDQ_MMC2_2.8V: No configuration
> [ 38.910541] VDDQ_EXT_1.8V: No configuration
> [ 38.915134] LDO2: regulator suspend disable supported
> [ 38.919753] VDD_ALIVE_1.0V: No configuration
> [ 38.935229] usb3503 0-0008: switched to STANDBY mode
> [ 38.935981] wake enabled for irq 123
> [ 38.955192] samsung-pinctrl 11000000.pinctrl: Setting external
> wakeup interrupt mask: 0xfbfff7ff
> [ 38.975448] Disabling non-boot CPUs ...
> [ 39.029279] s3c2410-wdt 10060000.watchdog: watchdog disabled
> [ 39.029576] wake disabled for irq 123
> [ 39.044319] usb3503 0-0008: switched to HUB mode
> [ 39.144089] wake disabled for irq 119
> [ 39.144812] dwc2 12480000.hsotg: resuming usb gadget g_ether
> [ 39.422626] usb 1-2: reset high-speed USB device number 2 using exynos-ehci
> [ 39.774632] usb 1-3: reset high-speed USB device number 3 using exynos-ehci
> [ 40.106478] OOM killer enabled.
> [ 40.106609] Restarting tasks ... done.
> [ 40.111100] PM: suspend exit
> [ 40.124058] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot
> req 400000Hz, actual 396825HZ div = 63)
> [root@archl-u3e ~]# [ 40.364705] mmc_host mmc1: Bus speed (slot 0) =
> 50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0)
> [ 41.220200] smsc95xx 1-2:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
> -------------------------------------------------------------------------------
> > How such explanation could look like? For example like this:
> > f8f3b7fc21b1 ("ARM: dts: exynos: Fix regulators configuration on Peach
> > Pi/Pit Chromebooks")
> > Marek clearly explained why he put the regulators "always-on", even
> > tough we do not know everything about this. More over, he mentions
> > that this fixes specific issue.
> >
>
> Thanks but I am not the expert here in general with regulator on/off.
> I will add comment if needed explain in more detail.
This kernel log does not prove whether these DTS properties make sense
or whether are proper at all. They prove that kernel uses some
configuration but I did not ask for this.
>
> [snip]
>
> > Summarizing, please answer:
> > 1. Why this is made off-in-suspend?
> > 2. Why this can be made off-in-suspend?
> >
>
> On MAX77686A PMIC. (some quote from the datasheet).
>
> Power ON/OFF by PWRREQ in PMIC=ON sequence is only effective when ON/OFF
> on all regulators above are assigned by PWRREQ=H/L.
>
> All programming must be done before the AP enters the sleep mode by
> pulling PWRREQ low since
> the AP does not have programming capability in (deep) sleep mode.
>
> *Regulator are not really turned off but set into IDLE / Standby
> state too be restored to Normal state*
>
> Power summary in image : [1] https://imgur.com/gallery/l74kliX
>
> Power Summary for MAX77686A of the regulator support PWRREQ
> Power Default ON | ON/OFF
> --------------------------------------
> BUCK1 | ON | PWRREQ or I2C
> BUCK2 | ON | PWRREQ or I2C
> BUCK3 | ON | PWRREQ or I2C
> BUCK4 | ON | PWREWQ or I2C
> BUCK5 | ON | I2C
> BUCK6 | ON | I2C
> BUCK7 | ON | I2C
> BUCK8 | OFF | I2C or ENB8 The external enable/disable pin, ENB8
> BUCK9 | OFF | I2C or ENB9 The external enable/disable pin, ENB9
> LDO1 | ON | I2C
> LDO2 | ON | PWRREQ or I2C
> LDO3 | ON | I2C
> LDO4 | ON | I2C
> LDO5 | ON | I2C
> LDO6 | ON | PWRREQ or I2C
> LDO7 | ON | PWRREQ or I2C
> LDO8 | ON | PWRREQ or I2C
> LDO9 | OFF | I2C
> LDO10 | ON | PWRREQ or I2C
> LDO11 | ON | PWRREQ or I2C
> LDO12 | ON | PWRREQ or I2C
> LDO13 | ON | I2C
> LDO14 | ON | PWRREQ or I2C
> LDO15 | ON | PWRREQ or I2C
> LDO16 | ON | PWRREQ or I2C
> LDO17 | OFF | I2C
> LDO18 | OFF | I2C
> LDO19 | OFF | I2C
> LDO20 | OFF | I2C OR ENL20 ENL20, external enable/disable pin
> LDO21 | OFF | I2C OR ENL21 ENL21, external enable/disable pin
> LDO22 | OFF | I2C OR ENL22 ENL22, external enable/disable pin
> LDO23 | OFF | I2C
> LDO24 | OFF | I2C
> LDO25 | OFF | I2C
> LDO26 | OFF | I2C
You quoted the datasheet which describes PMIC behavior. This does not
answer to my two questions at all.
>
> > > ldo20_reg: LDO20 {
> > > @@ -421,6 +451,9 @@
> > > regulator-max-microvolt = <1100000>;
> > > regulator-always-on;
> > > regulator-boot-on;
> > > + regulator-state-mem {
> > > + regulator-off-in-suspend;
> > > + };
> > > };
> >
> > I questioned this change two times. You did not answer to my
> > question... If you turn memory bus regulator off, how the memory will
> > work in Suspend-to-Memory mode? I might be missing here something but
> > it just looks suspicious. Maybe the regulator does not supply the
> > memory itself (so refresh works even when it is down), just the
> > interface? I don't know, it just looks suspicious. I need to see
> > proper explanation.
> >
> > I am sorry but I will not check other hunks in this patch. Please
> > provide the answers for all my questions here first.
> >
>
> As per above table of MAX77686 PWRREQ capabilities regulator nodes
> can be turned off during suspend reset of them remain on during suspend.
Just because something can be turned off does not mean that it should.
Apparently you made this assumption everywhere here and for my
questions "why?" you reply "datasheet of PMIC says it can be done".
This is wrong assumption and wrong justification for the patch.
I cannot accept this. Please answer my questions and provide proper
rationale for this patch.
>
> > Best regards,
> > Krzysztof
> >
>
> We could monitor the regulator states via sys filesystem and also
> using below tool
> https://git.linaro.org/power/powerdebug.git
>
> I have tried to summaries the feature required for this patch.
> some of which I have overlooked earlier before sending the patch.
>
> I am really poor in english for transform / interpreter the technical details
> required at for your queries. But I will try to improve my self in the future.
Again this is observing of kernel behavior after applying patch. It
has nothing to do whether change should be implemented and how it
affects real hardware. This is not even a measurement...
Best regards,
Krzysztof
hi Krzysztof,
On Tue, 26 Mar 2019 at 16:28, Krzysztof Kozlowski <[email protected]> wrote:
>
> On Tue, 26 Mar 2019 at 11:35, Anand Moon <[email protected]> wrote:
>
> (...)
>
> > > This is third or fourth submission but you marked it as v1. This makes
> > > it very difficult to discuss and reference previous versions.
> > >
> > > The commit message did not change since beginning (first version). I
> > > asked twice that you need to explain exactly why you put the the
> > > regulator to off or on state in suspend. Why?
> > > Because:
> > > 1. This change looks without justification - once you put on, then you
> > > put off, now again on,
> > > 2. Anyone reading the code later must know the rationale why this was done,
> > > 3. I am not quite sure whether this is good setting so I would be
> > > happy to be convinced.
> > >
> >
> > Like I mention in the patch summary that this.
> >
> > Current changes are based on
> > [0] https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/max77686.txt
> >
> > Regulators which can be turned off during system suspend:
> > -LDOn : 2, 6-8, 10-12, 14-16,
> > -BUCKn : 1-4.
> > Use standard regulator bindings for it ('regulator-off-in-suspend').
>
> I do not see how this is related to my questions.
>
> > > How to provide such explanation? The best in commit message. Sometimes
> > > in the comment in the code, depends.
> >
> > Ok I have been testing with following regulator debug prints to catch error.
> > [0] max77686-regulator.patch
> >
> > below is the console logs during suspend and resume.
> > -------------------------------------------------------------------------------
> > Last login: Sat Mar 23 18:22:46 on ttySAC1
> > [root@archl-u3e ~]# echo no > /sys/module/printk/parameters/console_suspend
> > [root@archl-u3e ~]# rtcwake -d /dev/rtc0 -m mem -s 10
> > rtcwake: wakeup from "mem" using /dev/rtc0 at Sat Mar 23 19:56:17 2019
> > [ 38.595854] PM: suspend entry (deep)
> > [ 38.596603] PM: Syncing filesystems ... done.
> > [ 38.629351] Freezing user space processes ... (elapsed 0.002 seconds) done.
> > [ 38.633192] OOM killer disabled.
> > [ 38.636035] Freezing remaining freezable tasks ... (elapsed 0.001
> > seconds) done.
> > [ 38.675059] smsc95xx 1-2:1.0 eth0: entering SUSPEND2 mode
> > [ 38.753120] dwc2 12480000.hsotg: suspending usb gadget g_ether
> > [ 38.754007] dwc2 12480000.hsotg: new device is full-speed
> > [ 38.758960] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
> > [ 38.765507] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
> > [ 38.774050] wake enabled for irq 119
> > [ 38.775761] BUCK9: No configuration
> > [ 38.779191] BUCK8_P3V3: No configuration
> > [ 38.782852] BUCK7_2.0V: No configuration
> > [ 38.786851] BUCK6_1.35V: No configuration
> > [ 38.790752] VDDQ_CKEM1_2_1.2V: No configuration
> > [ 38.796220] BUCK4: regulator suspend disable supported
> > [ 38.800769] BUCK3: regulator suspend disable supported
> > [ 38.806002] BUCK1: regulator suspend disable supported
> > [ 38.810644] LDO26: No configuration
> > [ 38.814169] VDDQ_LCD_1.8V: No configuration
> > [ 38.818267] LDO24: No configuration
> > [ 38.821732] LDO23: No configuration
> > [ 38.825262] LDO22_VDDQ_MMC4_2.8V: No configuration
> > [ 38.829992] TFLASH_2.8V: No configuration
> > [ 38.834040] LDO20_1.8V: No configuration
> > [ 38.837883] LDO19: No configuration
> > [ 38.841349] LDO18: No configuration
> > [ 38.844878] LDO17: No configuration
> > [ 38.848667] LDO16: regulator suspend disable supported
> > [ 38.853889] LDO15: regulator suspend disable supported
> > [ 38.858931] LDO14: regulator suspend disable supported
> > [ 38.863771] VDDQ_C2C_W_1.8V: No configuration
> > [ 38.868378] LDO12: regulator suspend disable supported
> > [ 38.873508] LDO11: regulator suspend disable supported
> > [ 38.878545] LDO10: regulator suspend disable supported
> > [ 38.883384] LDO9: No configuration
> > [ 38.887190] LDO8: regulator suspend disable supported
> > [ 38.892168] LDO7: regulator suspend disable supported
> > [ 38.897279] LDO6: regulator suspend disable supported
> > [ 38.901872] VDDQ_MMC1_3_1.8V: No configuration
> > [ 38.906363] VDDQ_MMC2_2.8V: No configuration
> > [ 38.910541] VDDQ_EXT_1.8V: No configuration
> > [ 38.915134] LDO2: regulator suspend disable supported
> > [ 38.919753] VDD_ALIVE_1.0V: No configuration
> > [ 38.935229] usb3503 0-0008: switched to STANDBY mode
> > [ 38.935981] wake enabled for irq 123
> > [ 38.955192] samsung-pinctrl 11000000.pinctrl: Setting external
> > wakeup interrupt mask: 0xfbfff7ff
> > [ 38.975448] Disabling non-boot CPUs ...
> > [ 39.029279] s3c2410-wdt 10060000.watchdog: watchdog disabled
> > [ 39.029576] wake disabled for irq 123
> > [ 39.044319] usb3503 0-0008: switched to HUB mode
> > [ 39.144089] wake disabled for irq 119
> > [ 39.144812] dwc2 12480000.hsotg: resuming usb gadget g_ether
> > [ 39.422626] usb 1-2: reset high-speed USB device number 2 using exynos-ehci
> > [ 39.774632] usb 1-3: reset high-speed USB device number 3 using exynos-ehci
> > [ 40.106478] OOM killer enabled.
> > [ 40.106609] Restarting tasks ... done.
> > [ 40.111100] PM: suspend exit
> > [ 40.124058] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot
> > req 400000Hz, actual 396825HZ div = 63)
> > [root@archl-u3e ~]# [ 40.364705] mmc_host mmc1: Bus speed (slot 0) =
> > 50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0)
> > [ 41.220200] smsc95xx 1-2:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
> > -------------------------------------------------------------------------------
> > > How such explanation could look like? For example like this:
> > > f8f3b7fc21b1 ("ARM: dts: exynos: Fix regulators configuration on Peach
> > > Pi/Pit Chromebooks")
> > > Marek clearly explained why he put the regulators "always-on", even
> > > tough we do not know everything about this. More over, he mentions
> > > that this fixes specific issue.
> > >
> >
> > Thanks but I am not the expert here in general with regulator on/off.
> > I will add comment if needed explain in more detail.
>
> This kernel log does not prove whether these DTS properties make sense
> or whether are proper at all. They prove that kernel uses some
> configuration but I did not ask for this.
>
> >
> > [snip]
> >
> > > Summarizing, please answer:
> > > 1. Why this is made off-in-suspend?
> > > 2. Why this can be made off-in-suspend?
> > >
> >
> > On MAX77686A PMIC. (some quote from the datasheet).
> >
> > Power ON/OFF by PWRREQ in PMIC=ON sequence is only effective when ON/OFF
> > on all regulators above are assigned by PWRREQ=H/L.
> >
> > All programming must be done before the AP enters the sleep mode by
> > pulling PWRREQ low since
> > the AP does not have programming capability in (deep) sleep mode.
> >
> > *Regulator are not really turned off but set into IDLE / Standby
> > state too be restored to Normal state*
> >
> > Power summary in image : [1] https://imgur.com/gallery/l74kliX
> >
> > Power Summary for MAX77686A of the regulator support PWRREQ
> > Power Default ON | ON/OFF
> > --------------------------------------
> > BUCK1 | ON | PWRREQ or I2C
> > BUCK2 | ON | PWRREQ or I2C
> > BUCK3 | ON | PWRREQ or I2C
> > BUCK4 | ON | PWREWQ or I2C
> > BUCK5 | ON | I2C
> > BUCK6 | ON | I2C
> > BUCK7 | ON | I2C
> > BUCK8 | OFF | I2C or ENB8 The external enable/disable pin, ENB8
> > BUCK9 | OFF | I2C or ENB9 The external enable/disable pin, ENB9
> > LDO1 | ON | I2C
> > LDO2 | ON | PWRREQ or I2C
> > LDO3 | ON | I2C
> > LDO4 | ON | I2C
> > LDO5 | ON | I2C
> > LDO6 | ON | PWRREQ or I2C
> > LDO7 | ON | PWRREQ or I2C
> > LDO8 | ON | PWRREQ or I2C
> > LDO9 | OFF | I2C
> > LDO10 | ON | PWRREQ or I2C
> > LDO11 | ON | PWRREQ or I2C
> > LDO12 | ON | PWRREQ or I2C
> > LDO13 | ON | I2C
> > LDO14 | ON | PWRREQ or I2C
> > LDO15 | ON | PWRREQ or I2C
> > LDO16 | ON | PWRREQ or I2C
> > LDO17 | OFF | I2C
> > LDO18 | OFF | I2C
> > LDO19 | OFF | I2C
> > LDO20 | OFF | I2C OR ENL20 ENL20, external enable/disable pin
> > LDO21 | OFF | I2C OR ENL21 ENL21, external enable/disable pin
> > LDO22 | OFF | I2C OR ENL22 ENL22, external enable/disable pin
> > LDO23 | OFF | I2C
> > LDO24 | OFF | I2C
> > LDO25 | OFF | I2C
> > LDO26 | OFF | I2C
>
> You quoted the datasheet which describes PMIC behavior. This does not
> answer to my two questions at all.
>
> >
> > > > ldo20_reg: LDO20 {
> > > > @@ -421,6 +451,9 @@
> > > > regulator-max-microvolt = <1100000>;
> > > > regulator-always-on;
> > > > regulator-boot-on;
> > > > + regulator-state-mem {
> > > > + regulator-off-in-suspend;
> > > > + };
> > > > };
> > >
> > > I questioned this change two times. You did not answer to my
> > > question... If you turn memory bus regulator off, how the memory will
> > > work in Suspend-to-Memory mode? I might be missing here something but
> > > it just looks suspicious. Maybe the regulator does not supply the
> > > memory itself (so refresh works even when it is down), just the
> > > interface? I don't know, it just looks suspicious. I need to see
> > > proper explanation.
> > >
> > > I am sorry but I will not check other hunks in this patch. Please
> > > provide the answers for all my questions here first.
> > >
> >
> > As per above table of MAX77686 PWRREQ capabilities regulator nodes
> > can be turned off during suspend reset of them remain on during suspend.
>
> Just because something can be turned off does not mean that it should.
> Apparently you made this assumption everywhere here and for my
> questions "why?" you reply "datasheet of PMIC says it can be done".
> This is wrong assumption and wrong justification for the patch.
>
> I cannot accept this. Please answer my questions and provide proper
> rationale for this patch.
>
> >
> > > Best regards,
> > > Krzysztof
> > >
> >
> > We could monitor the regulator states via sys filesystem and also
> > using below tool
> > https://git.linaro.org/power/powerdebug.git
> >
> > I have tried to summaries the feature required for this patch.
> > some of which I have overlooked earlier before sending the patch.
> >
> > I am really poor in english for transform / interpreter the technical details
> > required at for your queries. But I will try to improve my self in the future.
>
> Again this is observing of kernel behavior after applying patch. It
> has nothing to do whether change should be implemented and how it
> affects real hardware. This is not even a measurement...
>
> Best regards,
> Krzysztof
Lets discard this patch. sorry for the trouble in review.
Best Regards
-Anand