linux-kernel - [PATCH v3 0/5] media: qcom: camss: Introduce support for named power-domains

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Message-Id: <20231101-b4-camss-named-power-domains-v3-0-bbdf5f22462a@linaro.org>
Date:   Wed, 01 Nov 2023 10:54:30 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
        Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        matti.lehtimaki@...il.com
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/5] media: qcom: camss: Introduce support for named
 power-domains

V3:
- Includes bugfix reported on IRC
  genpd_link and genpd should be checked for NULL on the cleanup path.
  Matti Lehtimäki 
- Retains NULL check before dev_pm_domain_attach_by_name()
  I experimented with the suggested drop but of_property_match_string()
  chokes
  Link: https://lore.kernel.org/lkml/883ce8a7-80e1-4065-a957-424d0b4a6535@linaro.org/T/#m10e5a43d0245f13eca177ef2f65b24259c641030
  Konrad
- Fixes spelling caught by codespell - Konrad

Link: https://git.codelinaro.org/bryan.odonoghue/kernel/-/tree/b4/b4-camss-named-power-domains-v3
sm8250-testable: https://git.codelinaro.org/bryan.odonoghue/kernel/-/tree/b4/b4-camss-named-power-domains-v3+sm8250

V2:
- Incorporates Konrad's suggestion re: removing 'id'
- Adds RB - Konrad
- Adds in a flag to indicate if a VFE has a power domain.
  As I rebased this series I realised we had some magic indexing for VFE v
  VFE Lite, which isn't the root cause of my bug bear in this series but is
  the same sin - inferring functionality from indexing.
  Once we transition fully to named pds we won't need a 'has_pd' to flag
  which VFEs need power-domain attachment and which don't.
  That transition will require populating all upstream dtsi with pd-names
  and then deprecating the old way.
  has_pd is a far better choice than inferring from indexes so, I've added.

Link: https://git.codelinaro.org/bryan.odonoghue/kernel/-/commits/aa45a2b58aa1e187a2698a65164d694251f08fa1

V1:
At the moment the Qcom CAMSS driver relies on the declaration order of
power-domains within the dtsi to determine which power-domain relates to a
VFE and which power-domain relates to the top-level (top) CAMSS
power-domain.

VFE power-domains must be declared prior to the top power-domain. The top
power-domain must be declared last. Early SoCs have just one top
power-domain with later SoCs introducing VFE specific power-domains.

Differentiating between the number of power-domains results in lots of code
which is brittle and which we can mostly get rid of with named
power-domains.

The reliance on declaration ordering is in-effect magic number indexing.

This series introduces named power-domains for CAMSS and refactors some of
the code in CAMSS to support the new named power-domains. We continue to
support the legacy indexing model with an intention to remove after a
reasonable transition period.

New SoC additions should use named power-domains from now on.

Tested on x13s, rb5, db410c

Link: https://git.codelinaro.org/bryan.odonoghue/kernel/-/tree/linux-next-23-10-23-camss-named-power-domains

Bryan O'Donoghue (5):
  media: qcom: camss: Flag which VFEs require a power-domain
  media: qcom: camss: Convert to per-VFE pointer for power-domain
    linkages
  media: qcom: camss: Use common VFE pm_domain_on/pm_domain_off where
    applicable
  media: qcom: camss: Move VFE power-domain specifics into vfe.c
  media: qcom: camss: Add support for named power-domains

 .../media/platform/qcom/camss/camss-vfe-170.c | 36 --------
 .../media/platform/qcom/camss/camss-vfe-4-1.c |  8 +-
 .../media/platform/qcom/camss/camss-vfe-4-7.c | 36 --------
 .../media/platform/qcom/camss/camss-vfe-4-8.c | 31 -------
 .../media/platform/qcom/camss/camss-vfe-480.c | 36 --------
 drivers/media/platform/qcom/camss/camss-vfe.c | 77 ++++++++++++++++
 drivers/media/platform/qcom/camss/camss-vfe.h | 16 ++++
 drivers/media/platform/qcom/camss/camss.c     | 87 ++++++++++++-------
 drivers/media/platform/qcom/camss/camss.h     |  7 +-
 9 files changed, 156 insertions(+), 178 deletions(-)

--
2.42.0

---
Bryan O'Donoghue (5):
      media: qcom: camss: Flag which VFEs require a power-domain
      media: qcom: camss: Convert to per-VFE pointer for power-domain linkages
      media: qcom: camss: Use common VFE pm_domain_on/pm_domain_off where applicable
      media: qcom: camss: Move VFE power-domain specifics into vfe.c
      media: qcom: camss: Add support for named power-domains

 drivers/media/platform/qcom/camss/camss-vfe-170.c | 36 ----------
 drivers/media/platform/qcom/camss/camss-vfe-4-1.c |  8 +--
 drivers/media/platform/qcom/camss/camss-vfe-4-7.c | 36 ----------
 drivers/media/platform/qcom/camss/camss-vfe-4-8.c | 31 --------
 drivers/media/platform/qcom/camss/camss-vfe-480.c | 36 ----------
 drivers/media/platform/qcom/camss/camss-vfe.c     | 79 ++++++++++++++++++++
 drivers/media/platform/qcom/camss/camss-vfe.h     | 16 +++++
 drivers/media/platform/qcom/camss/camss.c         | 87 ++++++++++++++---------
 drivers/media/platform/qcom/camss/camss.h         |  7 +-
 9 files changed, 158 insertions(+), 178 deletions(-)
---
base-commit: 48016737a9af47328dd321df4dd3479ed5e2041d
change-id: 20231031-b4-camss-named-power-domains-cc2ac2722543

Best regards,
-- 
Bryan O'Donoghue <bryan.odonoghue@...aro.org>