From: Andrew Murray <andrew.murray@arm.com>
To: Dilip Kota <eswara.kota@linux.intel.com>
Cc: jingoohan1@gmail.com, gustavo.pimentel@synopsys.com,
lorenzo.pieralisi@arm.com, robh@kernel.org,
martin.blumenstingl@googlemail.com, linux-pci@vger.kernel.org,
hch@infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, andriy.shevchenko@intel.com,
cheol.yong.kim@intel.com, chuanhua.lei@linux.intel.com,
qi-ming.wu@intel.com
Subject: Re: [PATCH v4 2/3] dwc: PCI: intel: PCIe RC controller driver
Date: Fri, 25 Oct 2019 10:09:26 +0100 [thread overview]
Message-ID: <20191025090926.GX47056@e119886-lin.cambridge.arm.com> (raw)
In-Reply-To: <661f7e9c-a79f-bea6-08d8-4df54f500019@linux.intel.com>
On Tue, Oct 22, 2019 at 05:04:21PM +0800, Dilip Kota wrote:
> Hi Andrew Murray,
>
> On 10/21/2019 9:03 PM, Andrew Murray wrote:
> > On Mon, Oct 21, 2019 at 02:39:19PM +0800, Dilip Kota wrote:
> > > +
> > > +void dw_pcie_link_set_n_fts(struct dw_pcie *pci, u32 n_fts)
> > > +{
> > > + u32 val;
> > > +
> > > + val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
> > > + val &= ~PORT_LOGIC_N_FTS;
> > > + val |= n_fts;
> > > + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
> > > +}
> > I notice that pcie-artpec6.c (artpec6_pcie_set_nfts) also writes the FTS
> > and defines a bunch of macros to support this. It doesn't make sense to
> > duplicate this there. Therefore I think we need to update pcie-artpec6.c
> > to use this new function.
> I think we can do in a separate patch after these changes get merged and
> keep this patch series for intel PCIe driver and required changes in PCIe
> DesignWare framework.
The pcie-artpec6.c is a DWC driver as well. So I think we can do all this
together. This helps reduce the technical debt that will otherwise build up
in duplicated code.
> > > diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
> > > new file mode 100644
> > > index 000000000000..9142c70db808
> > > --- /dev/null
> > > +++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
> > > @@ -0,0 +1,590 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * PCIe host controller driver for Intel Gateway SoCs
> > > + *
> > > + * Copyright (c) 2019 Intel Corporation.
> > > + */
> > > +
> > > +#include <linux/bitfield.h>
> > > +#include <linux/clk.h>
> > > +#include <linux/gpio/consumer.h>
> > > +#include <linux/interrupt.h>
> > > +#include <linux/iopoll.h>
> > > +#include <linux/of_irq.h>
> > > +#include <linux/of_pci.h>
> > > +#include <linux/of_platform.h>
> > > +#include <linux/pci_regs.h>
> > > +#include <linux/phy/phy.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/reset.h>
> > > +
> > > +#include "../../pci.h"
> > I expected this to be removed, is it needed now?
>
> In the earlier patch you suggested to use "of_pci_get_max_link_speed()"
> instead of device_get_*.
> And, pci.h is required for it.
OK that makes sense.
> > > +
> > > +static int intel_pcie_get_resources(struct platform_device *pdev)
> > > +{
> > > + struct intel_pcie_port *lpp = platform_get_drvdata(pdev);
> > > + struct dw_pcie *pci = &lpp->pci;
> > > + struct device *dev = pci->dev;
> > > + struct resource *res;
> > > + int ret;
> > > +
> > > + ret = device_property_read_u32(dev, "linux,pci-domain", &lpp->id);
> > > + if (ret) {
> > > + dev_err(dev, "failed to get domain id, errno %d\n", ret);
> > > + return ret;
> > > + }
> > Why is this a required property?
> I marked it required property because lpp->id is being used during debug
> prints.
> -> sprintf(buf, "Port %2u Width x%u Speed %s GT/s\n", lpp->id,
> -> dev_info(dev, "Intel PCIe Root Complex Port %d init done\n", lpp->id);
>
> Hmmm.. I found, domain id can be traversed from pci_host_bridge structure
> after dw_pcie_host_init().
> I will remove the code for getting the pci-domain here.
Excellent.
>
> >
> > > +#define PCI_EXP_LNKCTL2_HASD 0x0200 /* Hw Autonomous Speed Disable */
> > I think this should be 0x0020.
> Yes, my miss, i will update.
> Thanks for pointing it.
>
> Thanks for reviewing and providing the inputs.
> Regards,
> Dilip
> >
> > Thanks,
> >
> > Andrew Murray
Thanks,
Andrew Murray
> >
> > > #define PCI_EXP_LNKSTA2 50 /* Link Status 2 */
> > > #define PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 52 /* v2 endpoints with link end here */
> > > #define PCI_EXP_SLTCAP2 52 /* Slot Capabilities 2 */
> > > --
> > > 2.11.0
> > >
next prev parent reply other threads:[~2019-10-25 9:09 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 6:39 [PATCH v4 0/3] PCI: Add Intel PCIe Driver and respective dt-binding yaml file Dilip Kota
2019-10-21 6:39 ` [PATCH v4 1/3] dt-bindings: PCI: intel: Add YAML schemas for the PCIe RC controller Dilip Kota
2019-10-21 11:19 ` Andrew Murray
2019-10-22 10:15 ` Dilip Kota
2019-10-24 20:31 ` Martin Blumenstingl
2019-10-29 7:53 ` Dilip Kota
2019-10-25 16:53 ` Rob Herring
2019-10-29 8:34 ` Dilip Kota
2019-10-31 10:51 ` Dilip Kota
2019-10-31 18:35 ` Rob Herring
2019-10-21 6:39 ` [PATCH v4 2/3] dwc: PCI: intel: PCIe RC controller driver Dilip Kota
2019-10-21 8:29 ` Gustavo Pimentel
2019-10-21 10:44 ` Dilip Kota
2019-10-22 10:18 ` Dilip Kota
2019-10-22 11:44 ` andriy.shevchenko
2019-10-25 9:01 ` Andrew Murray
2019-10-29 6:14 ` Dilip Kota
2019-10-21 13:03 ` Andrew Murray
2019-10-22 9:04 ` Dilip Kota
2019-10-25 9:09 ` Andrew Murray [this message]
2019-10-29 8:59 ` Dilip Kota
2019-11-01 10:59 ` Andrew Murray
2019-11-04 9:34 ` Dilip Kota
2019-11-04 10:47 ` Andrew Murray
2019-10-21 17:17 ` Bjorn Helgaas
2019-10-22 9:07 ` Dilip Kota
2019-10-22 13:09 ` Bjorn Helgaas
2019-10-29 7:45 ` Dilip Kota
2019-10-25 13:11 ` kbuild test robot
2019-10-25 13:11 ` [RFC PATCH] dwc: PCI: intel: intel_pcie_msi_init() can be static kbuild test robot
2019-10-21 6:39 ` [PATCH v4 3/3] pci: intel: Add sysfs attributes to configure pcie link Dilip Kota
2019-10-21 8:40 ` Gustavo Pimentel
2019-10-21 10:34 ` Dilip Kota
2019-10-21 13:38 ` Andrew Murray
2019-10-21 17:18 ` Bjorn Helgaas
2019-10-22 9:27 ` Dilip Kota
2019-10-22 12:59 ` Bjorn Helgaas
2019-10-29 9:31 ` Dilip Kota
2019-10-30 22:14 ` Bjorn Helgaas
2019-10-30 23:31 ` Rafael J. Wysocki
2019-10-31 2:56 ` Bjorn Helgaas
2019-10-31 9:13 ` Rafael J. Wysocki
2019-10-31 13:01 ` Bjorn Helgaas
2019-10-31 10:47 ` Dilip Kota
2019-10-31 13:22 ` Bjorn Helgaas
2019-11-01 5:47 ` Dilip Kota
2019-11-01 11:30 ` Andrew Murray
2019-10-29 10:42 ` Rafael J. Wysocki
2019-10-29 12:36 ` Bjorn Helgaas
2019-10-22 9:20 ` Dilip Kota
2019-10-25 9:34 ` Andrew Murray
2019-10-29 9:51 ` Dilip Kota
2019-10-21 8:08 ` [PATCH v4 0/3] PCI: Add Intel PCIe Driver and respective dt-binding yaml file Gustavo Pimentel
2019-10-21 8:31 ` Dilip Kota
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