linux-kernel - Re: [PATCH v2 3/5] pcie-qcom: provide a way to power up qca6390 chip on RB5 platform

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Message-ID: <Y6qqfCwC-O5b_bSR-8HY9-0aCeREaoAPsyOw5EVhv6YkZgPkzafs28dd5ldWZvT1Pkln-XfkB0t2gLFOClvJNDuny7zFAfYxbQzt0UMNjrE=@protonmail.com>
Date:   Sat, 30 Jan 2021 08:04:51 +0000
From:   Yassine Oudjana <y.oudjana@...tonmail.com>
To:     "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>
Cc:     "agross@...nel.org" <agross@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "svarbanov@...sol.com" <svarbanov@...sol.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH v2 3/5] pcie-qcom: provide a way to power up qca6390 chip on RB5 platform

On Thu, Jan 28, 2021 at 11:52 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> Some Qualcomm platforms require to power up an external device before
> probing the PCI bus. E.g. on RB5 platform the QCA6390 WiFi/BT chip needs
> to be powered up before PCIe0 bus is probed. Add a quirk to the
> respective PCIe root bridge to attach to the power domain if one is
> required, so that the QCA chip is started before scanning the PCIe bus.

I'm lead to believe that this is also needed for QCA6174. I tried taking
the driver you wrote and changing regulators to match the ones used by QCA6174,
but I found that it gets probed after PCIe, which makes it get -EPROBE_DEFER
when it tries to attach to the power domain, which it doesn't handle it and
just proceeds to scan the bus and not find the chip as usual.