From: Marek Szyprowski <m.szyprowski@samsung.com>
To: Viresh Kumar <viresh.kumar@linaro.org>,
Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: krzk@kernel.org, robh+dt@kernel.org, vireshk@kernel.org,
devicetree@vger.kernel.org, kgene@kernel.org,
pankaj.dubey@samsung.com, linux-samsung-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
b.zolnierkie@samsung.com
Subject: Re: [PATCH v2 0/9] Exynos Adaptive Supply Voltage support
Date: Wed, 24 Jul 2019 15:10:39 +0200 [thread overview]
Message-ID: <5ef302a4-5bbf-483d-dfdf-cf76f6f69cee@samsung.com> (raw)
In-Reply-To: <20190723020450.z2pqwetkn2tfhacq@vireshk-i7>
Hi Viresh,
On 2019-07-23 04:04, Viresh Kumar wrote:
> On 18-07-19, 16:30, Sylwester Nawrocki wrote:
>> This is second iteration of patch series adding ASV (Adaptive Supply
>> Voltage) support for Exynos SoCs. The first one can be found at:
>> https://lore.kernel.org/lkml/20190404171735.12815-1-s.nawrocki@samsung.com
>>
>> The main changes comparing to the first (RFC) version are:
>> - moving ASV data tables from DT to the driver,
>> - converting the chipid and the ASV drivers to use regmap,
>> - converting the ASV driver to proper platform driver.
>>
>> I tried the opp-supported-hw bitmask approach as in the Qualcomm CPUFreq
>> DT bindings but it resulted in too many OPPs and DT nodes, around 200
>> per CPU cluster. So the ASV OPP tables are now in the ASV driver, as in
>> downstream kernels.
> Hmm. Can you explain why do you have so many OPPs? How many
> frequencies do you actually support per cluster and what all varies
> per frequency based on hw ? How many hw version do u have ?
For big cores there are 20 frequencies (2100MHz .. 200MHz). Each SoC
might belong to one of the 3 production 'sets' and each set contains 14
so called 'asv groups', which assign the certain voltage values for each
of those 20 frequencies (the lower asv group means lower voltage needed
for given frequency).
> I am asking as the OPP core can be improved to support your case if
> possible. But I need to understand the problem first.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
next prev parent reply other threads:[~2019-07-24 13:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20190718143117eucas1p1e534b9075d10fbbbe427c66192205eb1@eucas1p1.samsung.com>
2019-07-18 14:30 ` [PATCH v2 0/9] Exynos Adaptive Supply Voltage support Sylwester Nawrocki
[not found] ` <CGME20190718143127eucas1p13b1e2c98d270140a87f09562ef46c9a3@eucas1p1.samsung.com>
2019-07-18 14:30 ` [PATCH v2 1/9] soc: samsung: Add exynos chipid driver support Sylwester Nawrocki
2019-07-23 12:57 ` Krzysztof Kozlowski
2019-07-23 14:10 ` Bartlomiej Zolnierkiewicz
2019-07-24 10:47 ` Krzysztof Kozlowski
2019-08-08 12:07 ` Sylwester Nawrocki
[not found] ` <CGME20190718143128eucas1p2677ae16d229dddcd9a0db8084f0da5cf@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 2/9] soc: samsung: Convert exynos-chipid driver to use the regmap API Sylwester Nawrocki
2019-07-23 13:01 ` Krzysztof Kozlowski
2019-08-08 12:07 ` Sylwester Nawrocki
[not found] ` <CGME20190718143130eucas1p26f2058f47eb2f4020e1ddbf1619d1ac8@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 3/9] soc: samsung: Add Exynos Adaptive Supply Voltage driver Sylwester Nawrocki
2019-07-23 13:38 ` Krzysztof Kozlowski
2019-08-08 12:07 ` Sylwester Nawrocki
2019-08-08 12:31 ` Krzysztof Kozlowski
2019-08-08 12:48 ` Robin Murphy
2019-08-08 13:14 ` Krzysztof Kozlowski
[not found] ` <CGME20190718143131eucas1p2e1afc9fe816fff52ee4d12e0979eeb4c@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 4/9] ARM: EXYNOS: enable exynos_chipid for ARCH_EXYNOS Sylwester Nawrocki
[not found] ` <CGME20190718143132eucas1p2afecae86f2ef17aa8a4a99df8ffa47d9@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 5/9] ARM64: " Sylwester Nawrocki
[not found] ` <CGME20190718143134eucas1p2aed09e2171d0d2d6b916dddac3637017@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 6/9] ARM: EXYNOS: Enable exynos-asv driver " Sylwester Nawrocki
[not found] ` <CGME20190718143135eucas1p2da5b7842b35327c60667064184619a9f@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 7/9] soc: samsung: Update the CHIP ID DT binding documentation Sylwester Nawrocki
[not found] ` <CGME20190718143136eucas1p2cedfe5ed5e8e6316e82b30a565dc4855@eucas1p2.samsung.com>
2019-07-18 14:30 ` [PATCH v2 8/9] ARM: dts: Add "syscon" compatible string to chipid node Sylwester Nawrocki
[not found] ` <CGME20190718143138eucas1p127542c4cb8416cee9af6a95f4bc98366@eucas1p1.samsung.com>
2019-07-18 14:30 ` [PATCH v2 9/9] ARM: dts: Add samsung,asv-bin property for odroidxu3-lite Sylwester Nawrocki
2019-07-23 2:04 ` [PATCH v2 0/9] Exynos Adaptive Supply Voltage support Viresh Kumar
2019-07-24 13:10 ` Marek Szyprowski [this message]
2019-07-25 2:23 ` Viresh Kumar
2019-08-09 15:58 ` Sylwester Nawrocki
2019-08-19 9:09 ` Viresh Kumar
2019-08-19 10:06 ` Viresh Kumar
2019-08-19 11:16 ` Sylwester Nawrocki
2019-08-19 11:25 ` Viresh Kumar
2019-08-19 13:39 ` Sylwester Nawrocki
2019-08-20 3:01 ` Viresh Kumar
2019-08-20 9:03 ` Sylwester Nawrocki
2019-08-20 9:21 ` Viresh Kumar
2019-09-04 12:37 ` Sylwester Nawrocki
2019-09-05 5:01 ` Viresh Kumar
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