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[RFC,v2,00/11] Simple QoS for exynos-bus driver using interconnect

Message ID 20190919142236.4071-1-a.swigon@samsung.com
Headers show
Series Simple QoS for exynos-bus driver using interconnect | expand

Message

Artur Świgoń Sept. 19, 2019, 2:22 p.m. UTC
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(-)

Comments

Chanwoo Choi Sept. 20, 2019, 1:07 a.m. UTC | #1
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(-)
>
Chanwoo Choi Sept. 20, 2019, 2:14 a.m. UTC | #2
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.

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(-)
>>
> 
>
Artur Świgoń Sept. 25, 2019, 5:47 a.m. UTC | #3
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?

> 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(-)
> > > 
> > 
> > 
> 
>
Chanwoo Choi Sept. 25, 2019, 6:12 a.m. UTC | #4
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(-)
>>>>
>>>
>>>
>>
>>
Artur Świgoń Sept. 25, 2019, 6:37 a.m. UTC | #5
On Wed, 2019-09-25 at 15:12 +0900, Chanwoo Choi wrote:
> 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.

I think that it is actually related to the specific version of dev_pm_qos (v5) that
I used because patch 08/08 of dev_pm_qos series modifies exynos_bus_probe() in
drivers/devfreq/exynos-bus.c (https://patchwork.kernel.org/patch/11149507/).

I will rebase the next RFC (v3) on latest dev_pm_qos patches from Leonard and the
latest Linux-next kernel.

> 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

Yes, requiring Kamil's patches is one of the changes in this RFC (v2), since they
are already merged.

> 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(-)
> > > > >
Chanwoo Choi Sept. 25, 2019, 6:48 a.m. UTC | #6
Hi,

On 19. 9. 25. 오후 3:37, Artur Świgoń wrote:
> On Wed, 2019-09-25 at 15:12 +0900, Chanwoo Choi wrote:
>> 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.
> 
> I think that it is actually related to the specific version of dev_pm_qos (v5) that
> I used because patch 08/08 of dev_pm_qos series modifies exynos_bus_probe() in
> drivers/devfreq/exynos-bus.c (https://patchwork.kernel.org/patch/11149507/).
> 
> I will rebase the next RFC (v3) on latest dev_pm_qos patches from Leonard and the
> latest Linux-next kernel.

My mistake. I only checked the Leonard's latest patches(v8)
which doesn't contain this patch. OK. I'll try again. Thanks.
[1] https://patchwork.kernel.org/patch/11149507/
- PM / devfreq: Move opp notifier registration to core

> 
>> 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
> 
> Yes, requiring Kamil's patches is one of the changes in this RFC (v2), since they
> are already merged.
> 
>> 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(-)
>>>>>>
> 
> 
> 
>