Hi all,
This is a follow-up patch aiming to add EM modification due to chip binning.
The first RFC and the discussion can be found here [1].
It uses Exynos chip driver code as a 1st user. The EM framework has been
extended to handle this use case easily, when the voltage has been changed
after setup. On my Odroid-xu4 in some OPPs I can observe ~20% power difference.
According to that data in driver tables it could be up to ~29%.
This chip binning is applicable to a lot of SoCs, so the EM framework should
make it easy to update. It uses the existing OPP and DT information to
re-calculate the new power values.
It has dependency on Exynos SoC driver tree.
Changes:
v5:
- adjusted aligning of the function arguments in patch 1/4 (Dietmar)
- adjusted the in-code comment patch 4/4 (Dietmar)
- added Reviewed-by to all patches (Dietmar)
v4:
- added asterisk in the comment section (test robot)
- change the patch 2/4 header name and use 'Refactor'
v3:
- updated header description patch 2/4 (Dietmar)
- removed 2 sentences from comment and adjusted in patch 3/4 (Dietmar)
- patch 4/4 re-phrased code comment (Dietmar)
- collected tags (Krzysztof, Viresh)
v2:
- removed 'ret' from error message which wasn't initialized (Christian)
v1:
- exported the OPP calculation function from the OPP/OF so it can be
used from EM fwk (Viresh)
- refactored EM updating function to re-use common code
- added new EM function which can be used by chip device drivers which
modify the voltage in OPPs
RFC is at [1]
Regards,
Lukasz Luba
[1] https://lore.kernel.org/lkml/[email protected]/
Lukasz Luba (4):
OPP: OF: Export dev_opp_pm_calc_power() for usage from EM
PM: EM: Refactor em_adjust_new_capacity()
PM: EM: Add em_dev_update_chip_binning()
soc: samsung: exynos-asv: Update Energy Model after adjusting voltage
drivers/opp/of.c | 17 +++--
drivers/soc/samsung/exynos-asv.c | 10 ++-
include/linux/energy_model.h | 5 ++
include/linux/pm_opp.h | 8 +++
kernel/power/energy_model.c | 106 +++++++++++++++++++++++++------
5 files changed, 121 insertions(+), 25 deletions(-)
--
2.25.1
On Wed, Apr 3, 2024 at 5:49 PM Lukasz Luba <[email protected]> wrote:
>
> Hi all,
>
> This is a follow-up patch aiming to add EM modification due to chip binning.
> The first RFC and the discussion can be found here [1].
>
> It uses Exynos chip driver code as a 1st user. The EM framework has been
> extended to handle this use case easily, when the voltage has been changed
> after setup. On my Odroid-xu4 in some OPPs I can observe ~20% power difference.
> According to that data in driver tables it could be up to ~29%.
>
> This chip binning is applicable to a lot of SoCs, so the EM framework should
> make it easy to update. It uses the existing OPP and DT information to
> re-calculate the new power values.
>
> It has dependency on Exynos SoC driver tree.
>
> Changes:
> v5:
> - adjusted aligning of the function arguments in patch 1/4 (Dietmar)
> - adjusted the in-code comment patch 4/4 (Dietmar)
> - added Reviewed-by to all patches (Dietmar)
> v4:
> - added asterisk in the comment section (test robot)
> - change the patch 2/4 header name and use 'Refactor'
> v3:
> - updated header description patch 2/4 (Dietmar)
> - removed 2 sentences from comment and adjusted in patch 3/4 (Dietmar)
> - patch 4/4 re-phrased code comment (Dietmar)
> - collected tags (Krzysztof, Viresh)
> v2:
> - removed 'ret' from error message which wasn't initialized (Christian)
> v1:
> - exported the OPP calculation function from the OPP/OF so it can be
> used from EM fwk (Viresh)
> - refactored EM updating function to re-use common code
> - added new EM function which can be used by chip device drivers which
> modify the voltage in OPPs
> RFC is at [1]
>
> Regards,
> Lukasz Luba
>
> [1] https://lore.kernel.org/lkml/20231220110339.1065505-1-lukasz.luba@armcom/
>
> Lukasz Luba (4):
> OPP: OF: Export dev_opp_pm_calc_power() for usage from EM
> PM: EM: Refactor em_adjust_new_capacity()
> PM: EM: Add em_dev_update_chip_binning()
> soc: samsung: exynos-asv: Update Energy Model after adjusting voltage
>
> drivers/opp/of.c | 17 +++--
> drivers/soc/samsung/exynos-asv.c | 10 ++-
> include/linux/energy_model.h | 5 ++
> include/linux/pm_opp.h | 8 +++
> kernel/power/energy_model.c | 106 +++++++++++++++++++++++++------
> 5 files changed, 121 insertions(+), 25 deletions(-)
>
> --
All patches in the series applied as 6.10 material, thanks!
On 4/8/24 15:06, Rafael J. Wysocki wrote:
> On Wed, Apr 3, 2024 at 5:49 PM Lukasz Luba <[email protected]> wrote:
>>
>> Hi all,
>>
>> This is a follow-up patch aiming to add EM modification due to chip binning.
>> The first RFC and the discussion can be found here [1].
>>
>> It uses Exynos chip driver code as a 1st user. The EM framework has been
>> extended to handle this use case easily, when the voltage has been changed
>> after setup. On my Odroid-xu4 in some OPPs I can observe ~20% power difference.
>> According to that data in driver tables it could be up to ~29%.
>>
>> This chip binning is applicable to a lot of SoCs, so the EM framework should
>> make it easy to update. It uses the existing OPP and DT information to
>> re-calculate the new power values.
>>
>> It has dependency on Exynos SoC driver tree.
>>
>> Changes:
>> v5:
>> - adjusted aligning of the function arguments in patch 1/4 (Dietmar)
>> - adjusted the in-code comment patch 4/4 (Dietmar)
>> - added Reviewed-by to all patches (Dietmar)
>> v4:
>> - added asterisk in the comment section (test robot)
>> - change the patch 2/4 header name and use 'Refactor'
>> v3:
>> - updated header description patch 2/4 (Dietmar)
>> - removed 2 sentences from comment and adjusted in patch 3/4 (Dietmar)
>> - patch 4/4 re-phrased code comment (Dietmar)
>> - collected tags (Krzysztof, Viresh)
>> v2:
>> - removed 'ret' from error message which wasn't initialized (Christian)
>> v1:
>> - exported the OPP calculation function from the OPP/OF so it can be
>> used from EM fwk (Viresh)
>> - refactored EM updating function to re-use common code
>> - added new EM function which can be used by chip device drivers which
>> modify the voltage in OPPs
>> RFC is at [1]
>>
>> Regards,
>> Lukasz Luba
>>
>> [1] https://lore.kernel.org/lkml/[email protected]/
>>
>> Lukasz Luba (4):
>> OPP: OF: Export dev_opp_pm_calc_power() for usage from EM
>> PM: EM: Refactor em_adjust_new_capacity()
>> PM: EM: Add em_dev_update_chip_binning()
>> soc: samsung: exynos-asv: Update Energy Model after adjusting voltage
>>
>> drivers/opp/of.c | 17 +++--
>> drivers/soc/samsung/exynos-asv.c | 10 ++-
>> include/linux/energy_model.h | 5 ++
>> include/linux/pm_opp.h | 8 +++
>> kernel/power/energy_model.c | 106 +++++++++++++++++++++++++------
>> 5 files changed, 121 insertions(+), 25 deletions(-)
>>
>> --
>
> All patches in the series applied as 6.10 material, thanks!
Thank you Rafael!
Regards,
Lukasz