linux-kernel - Re: [PATCH v2] PCI: cadence: Enable Controller to respond to received PTM Requests

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Message-ID: <20220323023714.GA1244184@bhelgaas>
Date:   Tue, 22 Mar 2022 21:37:14 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Christian Gmeiner <christian.gmeiner@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Tom Joseph <tjoseph@...ence.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] PCI: cadence: Enable Controller to respond to
 received PTM Requests

On Tue, Mar 22, 2022 at 02:20:14PM +0100, Christian Gmeiner wrote:
> Am Do., 10. März 2022 um 13:14 Uhr schrieb Christian Gmeiner
> <christian.gmeiner@...il.com>:
> >
> > Hi all
> >
> > > This enables the Controller [RP] to automatically respond with
> > > Response/ResponseD messages if CDNS_PCIE_LM_TPM_CTRL_PTMRSEN
> > > and PCI_PTM_CTRL_ENABLE bits are both set.
> > >
> > > Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>

We're in the middle of the merge window right now, but I'm sure
Lorenzo will be able to look at it after -rc1.  This looks fine to me.

> > > ---
> > >  drivers/pci/controller/cadence/pcie-cadence-host.c | 10 ++++++++++
> > >  drivers/pci/controller/cadence/pcie-cadence.h      |  4 ++++
> > >  2 files changed, 14 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
> > > index fb96d37a135c..940c7dd701d6 100644
> > > --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
> > > +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
> > > @@ -123,6 +123,14 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie)
> > >         return ret;
> > >  }
> > >
> > > +static void cdns_pcie_host_enable_ptm_response(struct cdns_pcie *pcie)
> > > +{
> > > +       u32 val;
> > > +
> > > +       val = cdns_pcie_readl(pcie, CDNS_PCIE_LM_PTM_CTRL);
> > > +       cdns_pcie_writel(pcie, CDNS_PCIE_LM_PTM_CTRL, val | CDNS_PCIE_LM_TPM_CTRL_PTMRSEN);

Lorenzo will likely wrap this line to fit in 80 columns like the rest
of the file, or if you rebase to v5.18-rc1 and post a v3, you could do
so.

> > > +}
> > > +
> > >  static int cdns_pcie_host_start_link(struct cdns_pcie_rc *rc)
> > >  {
> > >         struct cdns_pcie *pcie = &rc->pcie;
> > > @@ -501,6 +509,8 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
> > >         if (rc->quirk_detect_quiet_flag)
> > >                 cdns_pcie_detect_quiet_min_delay_set(&rc->pcie);
> > >
> > > +       cdns_pcie_host_enable_ptm_response(pcie);
> > > +
> > >         ret = cdns_pcie_start_link(pcie);
> > >         if (ret) {
> > >                 dev_err(dev, "Failed to start link\n");
> > > diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> > > index c8a27b6290ce..1ffa8fa77a8a 100644
> > > --- a/drivers/pci/controller/cadence/pcie-cadence.h
> > > +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> > > @@ -116,6 +116,10 @@
> > >  #define LM_RC_BAR_CFG_APERTURE(bar, aperture)          \
> > >                                         (((aperture) - 2) << ((bar) * 8))
> > >
> > > +/* PTM Control Register */
> > > +#define CDNS_PCIE_LM_PTM_CTRL  (CDNS_PCIE_LM_BASE + 0x0da8)
> > > +#define CDNS_PCIE_LM_TPM_CTRL_PTMRSEN  BIT(17)
> > > +
> > >  /*
> > >   * Endpoint Function Registers (PCI configuration space for endpoint functions)
> > >   */
> > > --
> > > 2.35.1
> > >
> >
> > This patch should be ready to land - or is anything missing?
> >
> 
> Gentle ping.
> 
> -- 
> greets
> --
> Christian Gmeiner, MSc
> 
> https://christian-gmeiner.info/privacypolicy