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

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Message-ID: <20190219111027.GB14696@e107981-ln.cambridge.arm.com>
Date:   Tue, 19 Feb 2019 11:10:27 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
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 Mon, Feb 18, 2019 at 09:16:03PM -0800, Bjorn Andersson wrote:
> 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")

Applied to pci/dwc for v5.1, thanks.

Lorenzo