linux-kernel - Re: [PATCH] PCI: qcom: Don't deassert reset GPIO during probe

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Message-ID: <20190219051602.GB13018@tuxbook-pro>
Date:   Mon, 18 Feb 2019 21:16:03 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Stanimir Varbanov <svarbanov@...sol.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Khasim Syed Mohammed <khasim.mohammed@...aro.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] PCI: qcom: Don't deassert reset GPIO during probe

On Wed 13 Feb 07:23 PST 2019, Lorenzo Pieralisi wrote:

> On Fri, Jan 25, 2019 at 03:26:16PM -0800, Bjorn Andersson wrote:
> > Acquiring the reset GPIO low means that reset is being deasserted, this
> > is followed almost immediately with qcom_pcie_host_init() asserting it,
> > initializing it and then finally deasserting it again, for the link to
> > come up.
> > 
> > Some PCIe devices requires a minimum time between the initial deassert
> > and subsequent reset cycles. In a platform that boots with the reset
> > GPIO asserted this requirement is being violated by this deassert/assert
> > pulse.
> > 
> > Acquiring the reset GPIO high will prevent this by matching the state to
> > the subsequent asserted state.
> > 
> > Cc: stable@...r.kernel.org
> 
> Missing Fixes: tag, please provide me one so that I can proceed.
> 

This applies to the original commit introducing this driver, so:

Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")

Regards,
Bjorn