linux-kernel - Re: [PATCH v4] PCI: qcom: Add system PM support

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Message-ID: <20220413054904.GA2015@thinkpad>
Date:   Wed, 13 Apr 2022 11:19:04 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Prasad Malisetty <quic_pmaliset@...cinc.com>, agross@...nel.org,
        bjorn.andersson@...aro.org, lorenzo.pieralisi@....com,
        robh@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, rajatja@...gle.com,
        refactormyself@...il.com, quic_vbadigan@...cinc.com,
        quic_ramkri@...cinc.com, swboyd@...omium.org,
        linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org
Subject: Re: [PATCH v4] PCI: qcom: Add system PM support

On Tue, Apr 12, 2022 at 01:40:08PM +0300, Kalle Valo wrote:
> + ath11k
> 
> Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> writes:
> 
> > +Kalle, linux-wireless
> >
> > On Tue, Mar 08, 2022 at 12:25:06AM +0530, Prasad Malisetty wrote:
> >> Add suspend_noirq and resume_noirq callbacks to handle
> >> system suspend and resume in dwc PCIe controller driver.
> >> 
> >> When system suspends, send PME turnoff message to enter
> >> link into L2 state. Along with powerdown the PHY, disable
> >> pipe clock, switch gcc_pcie_1_pipe_clk_src to XO if mux is
> >> supported and disable the pcie clocks, regulators.
> >> 
> >
> > Kalle, is this behaviour appropriate for WLAN devices as well? The devices
> > will be put into poweroff state (assuming no Vaux provided in D3cold) during
> > system suspend.
> 
> ath11k leaves the firmware running during suspend. I don't fully
> understand what the patch is doing, but if it cuts the power from the
> WLAN chip during suspend that will break ath11k.
> 

Thanks Kalle for the confirmation. Yes the device will be put into D3cold state
and that will most likely equal to poweroff state.

Prasad, you should try to just turn off the host resources like clocks and
regulators (not refclk) and let the device be in the default state
(D3hot/L{0/1}?) during suspend.

Thanks,
Mani

> -- 
> https://patchwork.kernel.org/project/linux-wireless/list/
> 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches