From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com ([217.140.101.70]:51460 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751595AbeACPv6 (ORCPT ); Wed, 3 Jan 2018 10:51:58 -0500 Date: Wed, 3 Jan 2018 15:51:49 +0000 From: Lorenzo Pieralisi To: Thierry Reding , Manikanta Maddireddy Cc: cyndis@kapsi.fi, bhelgaas@google.com, jonathanh@nvidia.com, robh+dt@kernel.org, frowand.list@gmail.com, rjw@rjwysocki.net, tglx@linutronix.de, vidyas@nvidia.com, kthota@nvidia.com, linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org Subject: Re: [PATCH V4 3/7] PCI: tegra: Remove PCI_REASSIGN_ALL_BUS flag for Tegra PCIe Message-ID: <20180103155149.GA8929@e107981-ln.cambridge.arm.com> References: <1512723493-865-1-git-send-email-mmaddireddy@nvidia.com> <1512723493-865-4-git-send-email-mmaddireddy@nvidia.com> <20171215173643.GA1050@red-moon> <20171220193011.GA31757@ulmo> <20171221104630.GB24280@red-moon> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20171221104630.GB24280@red-moon> Sender: linux-pci-owner@vger.kernel.org List-ID: On Thu, Dec 21, 2017 at 10:46:30AM +0000, Lorenzo Pieralisi wrote: > On Wed, Dec 20, 2017 at 08:30:11PM +0100, Thierry Reding wrote: > > On Fri, Dec 15, 2017 at 05:36:43PM +0000, Lorenzo Pieralisi wrote: > > > On Fri, Dec 08, 2017 at 02:28:09PM +0530, Manikanta Maddireddy wrote: > > > > Primary, secondary and subordinate default bus numbers are 0 in Tegra and > > > > it is expecting SW to program these numbers in configration space. > > > > > > > > pci_scan_bridge_extend() function programs these numbers in configuration > > > > space if secondary & subordinate bus numbers are 0 or PCI_REASSIGN_ALL_BUS > > > > flag is set. Since secondary & subordinate default bus numbers are 0, > > > > PCI_REASSIGN_ALL_BUS flag can be removed for Tegra PCIe. > > > > > > > > Signed-off-by: Manikanta Maddireddy > > > > --- > > > > V3: > > > > * new patch in V3 > > > > V4: > > > > * no change in this patch > > > > > > > > drivers/pci/host/pci-tegra.c | 1 - > > > > 1 file changed, 1 deletion(-) > > > > > > > > diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c > > > > index a549c5899e26..0d91f1a3a6b4 100644 > > > > --- a/drivers/pci/host/pci-tegra.c > > > > +++ b/drivers/pci/host/pci-tegra.c > > > > @@ -2604,7 +2604,6 @@ static int tegra_pcie_probe(struct platform_device *pdev) > > > > > > > > tegra_pcie_enable_ports(pcie); > > > > > > > > - pci_add_flags(PCI_REASSIGN_ALL_BUS); > > > > > > This looks obviously OK to me but I need Thierry's ACK to queue it. > > > > Just as an additional note: I think the real reason why this is okay to > > do is because we reset the PCI host controller in the kernel driver, so > > any bus assignments done by the firmware are reset as well. > > > > Acked-by: Thierry Reding > > Thank you. This series needs rebasing, we should try to untangle > the dependencies between series so that I can actually apply some > of these patches that make sense on their own. Manikanta, would you be able to decouple this series from: https://patchwork.ozlabs.org/patch/832053/ so that we can make forward progress ? There are some patches in this series that I could apply - if rebased. Lorenzo