linux-kernel - [PATCH V6 0/5] Add control for switching back and forth to HW control

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Date: Wed, 19 Jun 2024 19:44:08 +0530
From: Jagadeesh Kona <quic_jkona@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Stanimir Varbanov
	<stanimir.k.varbanov@...il.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J .
 Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>, Pavel Machek
	<pavel@....cz>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Andy
 Gross" <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abel Vesa <abel.vesa@...aro.org>
CC: <linux-pm@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Taniya Das <quic_tdas@...cinc.com>,
        "Jagadeesh Kona" <quic_jkona@...cinc.com>,
        Satya Priya Kakitapalli
	<quic_skakitap@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        "Ajit
 Pandey" <quic_ajipan@...cinc.com>
Subject: [PATCH V6 0/5] Add control for switching back and forth to HW control

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 V6:
- [PATCH 3/5]: Added details for 1usec delay in gdsc_set_hwmode()
- [PATCH 4/5]: Updated commit text
- Added R-By and T-By tags received on V5 RESEND
- Link to V5 RESEND: https://lore.kernel.org/all/20240413152013.22307-1-quic_jkona@quicinc.com/
- Link to V5: https://lore.kernel.org/all/20240315111046.22136-1-quic_jkona@quicinc.com/

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
- Link to V4: https://lore.kernel.org/all/20240122-gdsc-hwctrl-v4-0-9061e8a7aa07@linaro.org/

Changes in V4:
 - Re-worded 1st patch commit message, as per Bjorn's suggestion, and added
   Dmitry's R-b tag
 - Added Bjorn's and Dmitry's R-b tags to the 2nd patch
 - Re-worded 3rd patch commit message, to better explain the HW_CTRL_TRIGGER flag.
 - Added mode transition delay when setting mode for GDSC
 - Added status polling if GDSSC is enabled when transitioning from HW to SW
 - Re-worded 4th patch commit message to better explain why the
   HW_CTRL_TRIGGER needs to be used instead
 - Drop changes to SC7180, SDM845 and SM8550 video CC drivers, as only
   SC7280 and SM8250 have been tested so far. More platforms (with v6 venus)
   will be added eventually.
 - Call genpd set_hwmode API only for v6 and dropped the vcodec_pmdomains_hwctrl.
 - Re-worded 5th patch commit message accordingly. 
 - Link to V3: https://lore.kernel.org/lkml/20230823114528.3677667-1-abel.vesa@linaro.org/ 

Changes in V3:
 - 5th patch has been squashed in the 4th one
 - Link to V2: https://lore.kernel.org/lkml/20230816145741.1472721-1-abel.vesa@linaro.org/

Changes in V2:
 - patch for printing domain HW-managed mode in the summary
 - patch that adds one consumer (venus)
 - patch for gdsc with new (different) flag
 - patch for videocc GDSC provider to update flags
 - Link to 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: videocc: Use HW_CTRL_TRIGGER for SM8250, SC7280 vcodec
    GDSC's
  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                       | 42 ++++++++++
 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, 162 insertions(+), 21 deletions(-)

-- 
2.43.0