linux-kernel - Re: [PATCH v2 3/4] ARM: dts: exynos: Add regulator suspend configuration to Odroid XU3/XU4/HC1 family

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Message-ID: <2f58b63e-adf1-7935-8849-f311dc991b84@samsung.com>
Date:   Mon, 24 Jun 2019 11:01:25 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Anand Moon <linux.amoon@...il.com>, Kukjin Kim <kgene@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] ARM: dts: exynos: Add regulator suspend
 configuration to Odroid XU3/XU4/HC1 family

Hi Krzysztof,

On 2019-06-24 09:41, Krzysztof Kozlowski wrote:
> On Mon, 24 Jun 2019 at 09:20, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>> On 2019-06-23 18:02, Anand Moon wrote:
>>> Thanks for this patch. Please add my
>>>
>>> Tested-by: Anand Moon <linux.amoon@...il.com>
>>>
>>> [snip]
>>>
>>> Could you integrate below small changes into this patch.
>>> with these below changes suspend and resume work correctly at my end.
>>>
>>> [1] XU4_suspendresume.patch
>>>
>>> As per S2MPS11B PMIC 1.2.1 Regulator (Features)
>>> Fix the min max value for *Buck7* and *Buck8*
>>>
>>> -- Buck7 (VDD_1.0V_LDO) 1.5 A (1.2 V to 1.5 V, 12.5 mV step, default on 1.35 V)
>>> -- Buck8 (VDD_1.8V_LDO) 2.5 A (1.8 V to 2.1 V, 12.5 mV step, default on 2.0 V)
>> Could you elaborate why such change for Buck7 and Buck8 is needed?
> Anand has here valid point - the constraints in DTS do not match
> hardware manual. This leads to question whether voltage table in
> driver is proper... Another point is the voltage itself. The
> schematics describes them as at specific voltage (1.35 V and 2.0 V)
> but after boot they are 1.2 V and 1.85 V. Maybe this shift comes from
> the problem above.
>
>>> Also add suspend-off for *Buck9*
>>> Buck9 internally controls the power of USB hub.
>>> Adding suspend the this node help proper reset of USB hub on Odroid
>>> XU4 / HC1/ XU3
>>> during suspend and resume. Below it the logs from my testing.
>> Disabling Buck9 in suspend indeed reduces the power consumed by the
>> board during suspend-to-ram from about 80mA to as little as 7-10mA, what
>> matches the results of OdroidXU3. Thanks for the hint!
> Although I did not get what is the difference in the logs (Anand
> pasted two logs but they look the same) but the power consumption is
> reason is good enough. I would be happy to put in the changelog entire
> consumption  difference. I can measure it on XU3-Lite but can you give
> me the XU4 (before and after)?\


HC1:

next-20190620: 120mA (@5V)
this patchset: 72mA (@5V)
this patchset + fixup from Anand: 7-10mA (@5V)

XU4 (SDcard):

next-20190620: 88mA (@5V)
this patchset: 74mA (@5V), sometimes 42mA (@5V)
this patchset + fixup from Anand: 6-9mA (@5V)


XU4 (eMMC):

next-20190620: 100mA (@5V)
this patchset: 72mA (@5V), sometimes 41mA (@5V)
this patchset + fixup from Anand: 6-9mA (@5V)


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland