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From: Ulf Hansson <ulf.hansson@linaro.org>
To: Mark Brown <broonie@kernel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Marcel Holtmann <marcel@holtmann.org>,
	Johan Hedberg <johan.hedberg@gmail.com>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	DTML <devicetree@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-bluetooth@vger.kernel.org
Subject: Re: [PATCH v3 2/7] regulator: qca6390: add support for QCA639x powerup sequence
Date: Thu, 8 Jul 2021 12:09:24 +0200	[thread overview]
Message-ID: <CAPDyKFr=8spZBD+bTe3SjS=nATL-ByFu_epnT2Z4chSuQNke2w@mail.gmail.com> (raw)
In-Reply-To: <20210706115517.GB4529@sirena.org.uk>

- Peter (the email was bouncing)

On Tue, 6 Jul 2021 at 13:55, Mark Brown <broonie@kernel.org> wrote:
>
> On Tue, Jul 06, 2021 at 09:54:03AM +0200, Ulf Hansson wrote:
> > On Tue, 22 Jun 2021 at 00:32, Dmitry Baryshkov
>
> > > Qualcomm QCA6390/1 is a family of WiFi + Bluetooth SoCs, with BT part
> > > being controlled through the UART and WiFi being present on PCIe
> > > bus. Both blocks share common power sources. Add device driver handling
> > > power sequencing of QCA6390/1.
>
> > Power sequencing of discoverable buses have been discussed several
> > times before at LKML. The last attempt [1] I am aware of, was in 2017
> > from Peter Chen. I don't think there is a common solution, yet.
>
> This feels a bit different to the power sequencing problem - it's not
> exposing the individual inputs to the device but rather is a block that
> manages everything but needs a bit of a kick to get things going (I'd
> guess that with ACPI it'd be triggered via AML).  It's in the same space
> but it's not quite the same issue I think, something that can handle
> control of the individual resources might still struggle with this.

Well, to me it looks very similar to those resouses we could manage
with the mmc pwrseq, for SDIO. It's also typically the same kind of
combo-chips that moved from supporting SDIO to PCIe, for improved
performance I guess. More importantly, the same constraint to
pre-power on the device is needed to allow it to be discovered/probed.

Therefore, I think it would be worth having a common solution for
this, rather than a solution per subsystem or even worse, per device.

Unfortunately, it looks like Peter's email is bouncing so we can't get
an update from him.

Kind regards
Uffe

  reply	other threads:[~2021-07-08 10:10 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-21 22:31 [PATCH v3 0/7] Add support for Qualcomm QCA639x chips family Dmitry Baryshkov
2021-06-21 22:31 ` [PATCH v3 1/7] dt-bindings: regulator: qcom,qca6390: add binding for QCA6390 device Dmitry Baryshkov
2021-06-21 23:11   ` Add support for Qualcomm QCA639x chips family bluez.test.bot
2021-06-21 22:31 ` [PATCH v3 2/7] regulator: qca6390: add support for QCA639x powerup sequence Dmitry Baryshkov
2021-06-22 11:28   ` Mark Brown
2021-06-22 14:17     ` Dmitry Baryshkov
2021-06-22 14:38       ` Mark Brown
2021-06-22 16:46         ` Dmitry Baryshkov
2021-06-22 17:08           ` Mark Brown
2021-07-06  7:54   ` Ulf Hansson
2021-07-06 11:55     ` Mark Brown
2021-07-08 10:09       ` Ulf Hansson [this message]
2021-07-08 11:37         ` Dmitry Baryshkov
2021-07-14 16:47           ` Rob Herring
2021-07-14 17:10             ` Bjorn Andersson
2021-08-10 11:55             ` Ulf Hansson
2021-08-10 16:03               ` Bjorn Andersson
2021-08-12  9:48                 ` Ulf Hansson
2021-08-12 11:51                   ` Dmitry Baryshkov
2021-07-14 17:23         ` Bjorn Andersson
2021-06-21 22:31 ` [PATCH v3 3/7] Bluetooth: hci_qca: provide default device data Dmitry Baryshkov
2021-07-14 17:27   ` Bjorn Andersson
2021-06-21 22:31 ` [PATCH v3 4/7] Bluetooth: hci_qca: merge qca_power into qca_serdev Dmitry Baryshkov
2021-07-14 17:25   ` Bjorn Andersson
2021-06-21 22:31 ` [PATCH v3 5/7] Bluetooth: hci_qca: merge wcn & non-wcn code paths Dmitry Baryshkov
2021-06-21 22:31 ` [PATCH v3 6/7] Bluetooth: hci_qca: add power sequencer support to qca6390 Dmitry Baryshkov
2021-06-21 22:31 ` [PATCH v3 7/7] arm64: dts: qcom: qrb5165-rb5: add QCA6391 WiFi+BT SoC Dmitry Baryshkov

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