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From: Rob Herring <robh@kernel.org>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	PCI <linux-pci@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v2 4/5] PCI: keystone: Add quirk to mark AM654 RC BAR flag as IORESOURCE_UNSET
Date: Tue, 4 Jan 2022 12:25:01 -0600	[thread overview]
Message-ID: <CAL_JsqLn6K6N1rXGj69-xnZgPX-ecKePN_CYXLCEQLhxB=0m1Q@mail.gmail.com> (raw)
In-Reply-To: <20211126083119.16570-5-kishon@ti.com>

On Fri, Nov 26, 2021 at 2:31 AM Kishon Vijay Abraham I <kishon@ti.com> wrote:
>
> AM654 RootComplex has a hard coded 64 bit BAR of size 1MB and also has
> both MSI and MSI-X capability in it's config space. If PCIEPORTBUS is
> enabled, it tries to configure MSI-X and msix_mask_all() adds about 10
> Second boot up delay when it tries to write to undefined location.
>
> Add quirk to mark AM654 RC BAR flag as IORESOURCE_UNSET so that
> msix_map_region() returns NULL for Root Complex and avoid un-desirable
> writes to MSI-X table.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
>  drivers/pci/controller/dwc/pci-keystone.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
> index 52d20fe17ee9..73e6626a0d8f 100644
> --- a/drivers/pci/controller/dwc/pci-keystone.c
> +++ b/drivers/pci/controller/dwc/pci-keystone.c
> @@ -557,8 +557,14 @@ static void ks_pcie_quirk(struct pci_dev *dev)
>                 { 0, },
>         };
>
> -       if (pci_is_root_bus(bus))
> +       if (pci_is_root_bus(bus)) {

The existing quirk has to be called for every device. But this quirk
applies to just the RC, so can't you add another quirk and use the
existing quirk infrastructure matching mechanism?

>                 bridge = dev;
> +               if (pci_match_id(am6_pci_devids, bridge)) {
> +                       struct resource *r = &dev->resource[0];
> +
> +                       r->flags |= IORESOURCE_UNSET;
> +               }
> +       }
>
>         /* look for the host bridge */
>         while (!pci_is_root_bus(bus)) {
> --
> 2.17.1
>

  parent reply	other threads:[~2022-01-04 18:25 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-26  8:31 [PATCH v2 0/5] PCI: Keystone: Misc fixes for TI's AM65x PCIe Kishon Vijay Abraham I
2021-11-26  8:31 ` [PATCH v2 1/5] dt-bindings: PCI: ti,am65: Fix "ti,syscon-pcie-id"/"ti,syscon-pcie-mode" to take argument Kishon Vijay Abraham I
2021-11-27 23:13   ` Rob Herring
2021-11-29  4:03     ` Kishon Vijay Abraham I
2021-12-01 22:55   ` Rob Herring
2021-11-26  8:31 ` [PATCH v2 2/5] PCI: keystone: Use phandle argument from "ti,syscon-pcie-id"/"ti,syscon-pcie-mode" Kishon Vijay Abraham I
2021-11-26  8:31 ` [PATCH v2 3/5] PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0) Kishon Vijay Abraham I
2021-11-26  8:31 ` [PATCH v2 4/5] PCI: keystone: Add quirk to mark AM654 RC BAR flag as IORESOURCE_UNSET Kishon Vijay Abraham I
2022-01-04 15:57   ` Lorenzo Pieralisi
2022-01-11  6:23     ` Kishon Vijay Abraham I
2022-02-04 15:08       ` Kishon Vijay Abraham I
2022-02-08 11:53         ` Lorenzo Pieralisi
2022-02-08 16:20           ` Bjorn Helgaas
2022-01-04 18:25   ` Rob Herring [this message]
2021-11-26  8:31 ` [PATCH v2 5/5] PCI: keystone: Set DMA mask and coherent DMA mask Kishon Vijay Abraham I
2022-02-28 11:38   ` Christian Gmeiner
2022-01-04  9:02 ` [PATCH v2 0/5] PCI: Keystone: Misc fixes for TI's AM65x PCIe Kishon Vijay Abraham I
2022-01-07 10:56 ` (subset) " Lorenzo Pieralisi

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