linux-kernel - Re: [RFC PATCH v2 00/11] Simple QoS for exynos-bus driver using interconnect

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Message-ID: <fe6d026d-71b5-438d-6932-6a2234fc72c2@samsung.com>
Date:   Fri, 20 Sep 2019 10:07:05 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Artur Świgoń <a.swigon@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     myungjoo.ham@...sung.com, inki.dae@...sung.com,
        sw0312.kim@...sung.com, georgi.djakov@...aro.org,
        leonard.crestez@....com, m.szyprowski@...sung.com,
        b.zolnierkie@...sung.com, krzk@...nel.org,
        "cpgs (cpgs@...sung.com)" <cpgs@...sung.com>
Subject: Re: [RFC PATCH v2 00/11] Simple QoS for exynos-bus driver using
 interconnect

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