linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Robert Foss <robert.foss@linaro.org>
To: Andrey Konovalov <andrey.konovalov@linaro.org>
Cc: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Todor Tomov <todor.too@gmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	angelogioacchino.delregno@somainline.org,
	MSM <linux-arm-msm@vger.kernel.org>,
	linux-media <linux-media@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	AngeloGioacchino Del Regno <kholk11@gmail.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Nicolas Boichat <drinkcat@chromium.org>,
	Rob Herring <robh@kernel.org>, Tomasz Figa <tfiga@chromium.org>,
	Azam Sadiq Pasha Kapatrala Syed <akapatra@quicinc.com>,
	Sarvesh Sridutt <Sarvesh.Sridutt@smartwirelesscompute.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Jonathan Marek <jonathan@marek.ca>
Subject: Re: [PATCH v5 12/22] media: camss: Remove per VFE power domain toggling
Date: Wed, 24 Feb 2021 15:53:34 +0100	[thread overview]
Message-ID: <CAG3jFysEkRNXsaXudXd9msLPU3RiFcPpAgS6ecbOjeVfdwpb4A@mail.gmail.com> (raw)
In-Reply-To: <32b2cd1d-e41a-4571-ac4f-4ec055b3f6cb@linaro.org>

Hey Andrey,

>
> On 17.02.2021 14:21, Robert Foss wrote:
> > For Titan ISPs clocks fail to re-enable during vfe_get()
> > after any vfe has been halted and its corresponding power
> > domain power has been detached.
>
> OK.
>
> > Since all of the clocks depend on all of the PDs, per
> > VFE PD detaching is no option for this generation of HW.
>
> But this patch removes camss_pm_domain_on/off calls from
> vfe_get/put() for all the SOCs, not only for sdm845.
> And this looks like a regression (higher power consumption)
> for all the generation1 devices.

Yeah, that is a serious problem with the approach I picked here. The
power difference shouldn't be huge however, since the best case
scenario savings of the previous implementation was being able to
power down 1 VFE when the other one is working. If none of the VFEs is
working, nothing is powered up both in the previous implementation &
using this patch.

>
> Is it possible to handle gen1 and gen2 hardware differently,
> so that gen1 continued to use camss_pm_domain_on/off as
> before?

I hesitated going down this gen1/gen2 split here, due to how deep into
the common code some of this functionality is. Let me have another
look at this though, not having a power regression for gen1 devices
would definitely be preferable.

  reply	other threads:[~2021-02-24 15:30 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-17 11:21 [PATCH v5 00/22] Add support for the SDM845 Camera Subsystem Robert Foss
2021-02-17 11:21 ` [PATCH v5 01/22] media: camss: Fix vfe_isr_comp_done() documentation Robert Foss
2021-02-19 21:05   ` Nicolas Dufresne
2021-02-22 10:51     ` Robert Foss
2021-02-20 18:44   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 02/22] media: camss: Fix vfe_isr comment typo Robert Foss
2021-02-17 11:21 ` [PATCH v5 03/22] media: camss: Replace trace_printk() with dev_dbg() Robert Foss
2021-02-17 11:21 ` [PATCH v5 04/22] media: camss: Add CAMSS_845 camss version Robert Foss
2021-02-20 18:42   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 05/22] media: camss: Make ISPIF subdevice optional Robert Foss
2021-02-18 19:49   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 06/22] media: camss: Refactor VFE HW version support Robert Foss
2021-02-20 18:35   ` Andrey Konovalov
2021-02-22 10:46     ` Robert Foss
2021-02-17 11:21 ` [PATCH v5 07/22] media: camss: Add support for VFE hardware version Titan 170 Robert Foss
2021-02-20 21:40   ` Andrey Konovalov
2021-02-22 16:37     ` Robert Foss
2021-02-22 17:06       ` Andrey Konovalov
2021-02-22 17:21         ` Robert Foss
2021-02-22 17:24           ` Andrey Konovalov
2021-02-20 21:40   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 08/22] media: camss: Add missing format identifiers Robert Foss
2021-02-22 16:26   ` Andrey Konovalov
2021-02-23 17:25     ` Robert Foss
2021-02-17 11:21 ` [PATCH v5 09/22] media: camss: Refactor CSID HW version support Robert Foss
2021-02-21 15:15   ` Andrey Konovalov
2021-02-21 17:50     ` Andrey Konovalov
2021-02-22 18:13       ` Robert Foss
2021-02-17 11:21 ` [PATCH v5 10/22] media: camss: Add support for CSID hardware version Titan 170 Robert Foss
2021-02-21 17:14   ` Andrey Konovalov
2021-02-22 17:06     ` Robert Foss
2021-02-17 11:21 ` [PATCH v5 11/22] media: camss: Add support for CSIPHY " Robert Foss
2021-02-21 18:17   ` Andrey Konovalov
2021-02-23  9:36     ` Robert Foss
2021-02-17 11:21 ` [PATCH v5 12/22] media: camss: Remove per VFE power domain toggling Robert Foss
2021-02-22 11:44   ` Andrey Konovalov
2021-02-24 14:53     ` Robert Foss [this message]
2021-02-17 11:21 ` [PATCH v5 13/22] media: camss: Enable SDM845 Robert Foss
2021-02-21 18:32   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 14/22] dt-bindings: media: camss: Add qcom,msm8916-camss binding Robert Foss
2021-02-17 11:21 ` [PATCH v5 15/22] dt-bindings: media: camss: Add qcom,msm8996-camss binding Robert Foss
2021-02-17 11:21 ` [PATCH v5 16/22] dt-bindings: media: camss: Add qcom,sdm660-camss binding Robert Foss
2021-02-17 11:21 ` [PATCH v5 17/22] dt-bindings: media: camss: Add qcom,sdm845-camss binding Robert Foss
2021-02-17 11:21 ` [PATCH v5 18/22] MAINTAINERS: Change CAMSS documentation to use dtschema bindings Robert Foss
2021-02-17 11:21 ` [PATCH v5 19/22] media: dt-bindings: media: Remove qcom,camss documentation Robert Foss
2021-02-17 11:21 ` [PATCH v5 20/22] arm64: dts: sdm845: Add CAMSS ISP node Robert Foss
2021-02-21 18:39   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 21/22] arm64: dts: sdm845-db845c: Configure regulators for camss node Robert Foss
2021-02-21 18:39   ` Andrey Konovalov
2021-02-17 11:21 ` [PATCH v5 22/22] arm64: dts: sdm845-db845c: Enable ov8856 sensor and connect to ISP Robert Foss
2021-02-21 18:39   ` Andrey Konovalov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAG3jFysEkRNXsaXudXd9msLPU3RiFcPpAgS6ecbOjeVfdwpb4A@mail.gmail.com \
    --to=robert.foss@linaro.org \
    --cc=Sarvesh.Sridutt@smartwirelesscompute.com \
    --cc=agross@kernel.org \
    --cc=akapatra@quicinc.com \
    --cc=andrey.konovalov@linaro.org \
    --cc=angelogioacchino.delregno@somainline.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=devicetree@vger.kernel.org \
    --cc=drinkcat@chromium.org \
    --cc=jonathan@marek.ca \
    --cc=kholk11@gmail.com \
    --cc=laurent.pinchart@ideasonboard.com \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-media@vger.kernel.org \
    --cc=mchehab@kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=robh@kernel.org \
    --cc=sakari.ailus@iki.fi \
    --cc=tfiga@chromium.org \
    --cc=todor.too@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).