linux-kernel - Re: [PATCH V5 0/5] PM: domains: Add control for switching back and forth to HW control

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Message-ID: <CAPDyKFpOobCrmeeTaFhnwMMhoWGKC6qz9851VjVoDP2fBZEUzA@mail.gmail.com>
Date: Mon, 18 Mar 2024 15:39:27 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Jagadeesh Kona <quic_jkona@...cinc.com>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Abel Vesa <abel.vesa@...aro.org>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH V5 0/5] PM: domains: Add control for switching back and
 forth to HW control

- trimmed cc list

On Fri, 15 Mar 2024 at 12:11, Jagadeesh Kona <quic_jkona@...cinc.com> wrote:
>
> This series adds support for dev_pm_genpd_set_hwmode() and dev_pm_genpd_get_hwmode() APIs
> and support in gdsc provider drivers to register respective callbacks and venus consumer
> driver example using above API to switch the power domain(GDSC) to HW/SW modes dynamically
> at runtime.
>
> Changes in V5:
> - Updated 1st patch as per V4 review comments to synchronize the initial HW mode state by
>   invoking ->get_hwmode_dev()callback in genpd_add_device()
> - With above change, SW cached hwmode will contain correct value initially, and it will be
>   updated everytime mode is changed in set_hwmode, hence updated dev_pm_genpd_get_hwmode()
>   to just return SW cached hwmode in 1st patch
> - Updated commit text for 1st, 3rd, 4th and 5th patches
> - Updated 3rd and 5th patches as per review comments received on V4 series
> - Added R-By tags received in older series to 1st and 2nd patches
>
> Previous series:
> V4: https://lore.kernel.org/all/20240122-gdsc-hwctrl-v4-0-9061e8a7aa07@linaro.org/
> V3: https://lore.kernel.org/lkml/20230823114528.3677667-1-abel.vesa@linaro.org/
> V2: https://lore.kernel.org/lkml/20230816145741.1472721-1-abel.vesa@linaro.org/
> V1: https://lore.kernel.org/all/20230628105652.1670316-1-abel.vesa@linaro.org/
>
> Abel Vesa (1):
>   PM: domains: Add the domain HW-managed mode to the summary
>
> Jagadeesh Kona (3):
>   clk: qcom: gdsc: Add set and get hwmode callbacks to switch GDSC mode
>   clk: qcom: Use HW_CTRL_TRIGGER flag to switch video GDSC to HW mode
>   venus: pm_helpers: Use dev_pm_genpd_set_hwmode to switch GDSC mode on
>     V6
>
> Ulf Hansson (1):
>   PM: domains: Allow devices attached to genpd to be managed by HW
>
>  drivers/clk/qcom/gdsc.c                       | 37 +++++++++
>  drivers/clk/qcom/gdsc.h                       |  1 +
>  drivers/clk/qcom/videocc-sc7280.c             |  2 +-
>  drivers/clk/qcom/videocc-sm8250.c             |  4 +-
>  .../media/platform/qcom/venus/pm_helpers.c    | 39 ++++++----
>  drivers/pmdomain/core.c                       | 78 ++++++++++++++++++-
>  include/linux/pm_domain.h                     | 17 ++++
>  7 files changed, 157 insertions(+), 21 deletions(-)
>

This looks good to me! I can help to funnel the series through my
pmdomain tree, if that's the preferred route? Bjorn/Konrad, please let
me know.

Kind regards
Uffe