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

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Date:   Tue, 12 Apr 2022 13:40:08 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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

+ 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.

-- 
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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches