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Subject: Re: [RFC PATCH v2 00/11] Simple QoS for exynos-bus driver using
 interconnect
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From:   Chanwoo Choi <cw00.choi@samsung.com>
Organization: Samsung Electronics
Message-ID: <0cceb46a-fca1-62ae-c2cc-fb0f9b9bd132@samsung.com>
Date:   Wed, 25 Sep 2019 15:12:39 +0900
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Hi,

On 19. 9. 25. 오후 2:47, Artur Świgoń wrote:
> Hi,
> 
> On Fri, 2019-09-20 at 11:14 +0900, Chanwoo Choi wrote:
>> Hi Artur,
>>
>> I tried to just build this patch on mainline kernel or linux-next.
>> But, when I applied them, merge conflict happens. You didn't develop
>> them on latest version. Please rebase them based on latest mainline kernel.
> 
> I developed on top of next-20190918 on which I applied
> https://patchwork.kernel.org/cover/11149497/ as I mentioned in the cover
> letter. The dev_pm_qos patches and my RFC have just cleanly rebased together on
> top of next-20190920. Could you check if you have the dev_pm_qos patches (v5,
> the version number is missing in this one; link above) and if so, where does the
> conflict appear?

I faced on the merge conflict of drivers/devfreq/exynos-bus.c.
I think that It is not related to to dev_pm_qos patch.

Maybe, Kamil's patches[1] changed the many things of exynos-bus.c
If your test branch doesn't contain following patches, 
you need to rebase your patches based on latest mainline kernel 
from Linus Torvald.
[1] https://patchwork.kernel.org/cover/11083663/
- [RESEND PATCH v5 0/4] add coupled regulators for Exynos5422/5800

Today, I tried to apply these patch again based on latest mainline kernel.
The merge conflict happen still.

- merge conflict log
Applying: devfreq: exynos-bus: Extract exynos_bus_profile_init()
error: patch failed: drivers/devfreq/exynos-bus.c:334
error: drivers/devfreq/exynos-bus.c: patch does not apply
Patch failed at 0001 devfreq: exynos-bus: Extract exynos_bus_profile_init()


> 
>> On 19. 9. 20. 오전 10:07, Chanwoo Choi wrote:
>>> Hi Artur,
>>>
>>> On v1, I mentioned that we need to discuss how to change
>>> the v2 for this. But, I have not received any reply from you on v1.
>>> And, without your reply from v1, you just send v2.
>>>
>>> I think that it is not proper development sequence.
>>> I have spent many times to review your patches
>>> and also I'll review your patches. You have to take care
>>> the reply of reviewer and and keep the basic rule
>>> of mailing contribution for discussion.
>>>
>>> On 19. 9. 19. 오후 11:22, Artur Świgoń wrote:
>>>> The following patchset adds interconnect[1][2] framework support to the
>>>> exynos-bus devfreq driver. Extending the devfreq driver with interconnect
>>>> capabilities started as a response to the issue referenced in [3]. The
>>>> patches can be subdivided into four logical groups:
>>>>
>>>> (a) Refactoring the existing devfreq driver in order to improve readability
>>>> and accommodate for adding new code (patches 01--04/11).
>>>>
>>>> (b) Tweaking the interconnect framework to support the exynos-bus use case
>>>> (patches 05--07/11). Exporting of_icc_get_from_provider() allows us to
>>>> avoid hardcoding every single graph edge in the DT or driver source, and
>>>> relaxing the requirement contained in that function removes the need to
>>>> provide dummy node IDs in the DT. Adjusting the logic in
>>>> apply_constraints() (drivers/interconnect/core.c) accounts for the fact
>>>> that every bus is a separate entity and therefore a separate interconnect
>>>> provider, albeit constituting a part of a larger hierarchy.
>>>>
>>>> (c) Implementing interconnect providers in the exynos-bus devfreq driver
>>>> and adding required DT properties for one selected platform, namely
>>>> Exynos4412 (patches 08--09/11). Due to the fact that this aims to be a
>>>> generic driver for various Exynos SoCs, node IDs are generated dynamically
>>>> rather than hardcoded. This has been determined to be a simpler approach,
>>>> but depends on changes described in (b).
>>>>
>>>> (d) Implementing a sample interconnect consumer for exynos-mixer targeted
>>>> at the issue referenced in [3], again with DT info only for Exynos4412
>>>> (patches 10--11/11).
>>>>
>>>> Integration of devfreq and interconnect functionalities is achieved by
>>>> using dev_pm_qos_*() API[5]. All new code works equally well when
>>>> CONFIG_INTERCONNECT is 'n' (as in exynos_defconfig) in which case all
>>>> interconnect API functions are no-ops.
>>>>
>>>> This patchset depends on [5].
>>>>
>>>> --- Changes since v1 [6]:
>>>> * Rebase on [4] (coupled regulators).
>>>> * Rebase on [5] (dev_pm_qos for devfreq).
>>>> * Use dev_pm_qos_*() API[5] instead of overriding frequency in
>>>>   exynos_bus_target().
>>>> * Use IDR for node ID allocation.
>>>> * Avoid goto in functions extracted in patches 01 & 02 (cf. patch 04).
>>>> * Reverse order of multiplication and division in
>>>>   mixer_set_memory_bandwidth() (patch 11) to avoid integer overflow.
>>>>
>>>> ---
>>>> Artur Świgoń
>>>> Samsung R&D Institute Poland
>>>> Samsung Electronics
>>>>
>>>> ---
>>>> References:
>>>> [1] Documentation/interconnect/interconnect.rst
>>>> [2] Documentation/devicetree/bindings/interconnect/interconnect.txt
>>>> [3] https://patchwork.kernel.org/patch/10861757/ (original issue)
>>>> [4] https://patchwork.kernel.org/cover/11083663/ (coupled regulators; merged)
>>>> [5] https://patchwork.kernel.org/cover/11149497/ (dev_pm_qos for devfreq)
>>>> [6] https://patchwork.kernel.org/cover/11054417/ (v1 of this RFC)
>>>>
>>>> Artur Świgoń (10):
>>>>   devfreq: exynos-bus: Extract exynos_bus_profile_init()
>>>>   devfreq: exynos-bus: Extract exynos_bus_profile_init_passive()
>>>>   devfreq: exynos-bus: Change goto-based logic to if-else logic
>>>>   devfreq: exynos-bus: Clean up code
>>>>   interconnect: Export of_icc_get_from_provider()
>>>>   interconnect: Relax requirement in of_icc_get_from_provider()
>>>>   interconnect: Relax condition in apply_constraints()
>>>>   arm: dts: exynos: Add parents and #interconnect-cells to Exynos4412
>>>>   devfreq: exynos-bus: Add interconnect functionality to exynos-bus
>>>>   arm: dts: exynos: Add interconnects to Exynos4412 mixer
>>>>
>>>> Marek Szyprowski (1):
>>>>   drm: exynos: mixer: Add interconnect support
>>>>
>>>>  .../boot/dts/exynos4412-odroid-common.dtsi    |   1 +
>>>>  arch/arm/boot/dts/exynos4412.dtsi             |  10 +
>>>>  drivers/devfreq/exynos-bus.c                  | 319 +++++++++++++-----
>>>>  drivers/gpu/drm/exynos/exynos_mixer.c         |  71 +++-
>>>>  drivers/interconnect/core.c                   |  12 +-
>>>>  include/linux/interconnect-provider.h         |   6 +
>>>>  6 files changed, 327 insertions(+), 92 deletions(-)
>>>>
>>>
>>>
>>
>>


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics