From: Bjorn Helgaas <helgaas@kernel.org>
To: Rob Herring <robh@kernel.org>
Cc: "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Tiezhu Yang" <yangtiezhu@loongson.cn>,
"Jiaxun Yang" <jiaxun.yang@flygoat.com>,
"Huacai Chen" <chenhuacai@kernel.org>,
"Ray Jui" <rjui@broadcom.com>,
"Scott Branden" <sbranden@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
linux-tegra@vger.kernel.org
Subject: Re: [PATCH 19/19] PCI: Set bridge map_irq and swizzle_irq to default functions
Date: Tue, 11 Jan 2022 15:46:08 -0600 [thread overview]
Message-ID: <20220111214608.GA169999@bhelgaas> (raw)
In-Reply-To: <20200722022514.1283916-20-robh@kernel.org>
[-cc many, +cc iproc, loongson, tegra maintainers]
On Tue, Jul 21, 2020 at 08:25:14PM -0600, Rob Herring wrote:
> The majority of DT based host drivers use the default .map_irq() and
> .swizzle_irq() functions, so let's initialize the function pointers to
> the default and drop setting them in the host drivers.
>
> Drivers like iProc which don't support legacy interrupts need to set
> .map_irq() back to NULL.
Probably a dumb question...
This patch removed all the ->swizzle_irq users in drivers/pci/, which
is great -- IIUC swizzling is specified by the PCI-to-PCI Bridge Spec,
r1.2, sec 9.1, and should not be device-specific. I assume the few
remaining arch/ users (arm and alpha) are either bugs or workarounds
for broken devices.
My question is why we still have a few users of ->map_irq: loongson,
tegra, iproc. Shouldn't this mapping be described somehow via DT?
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index fc4e38fec928..97433beff6cf 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2709,7 +2709,6 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>
> host->ops = &tegra_pcie_ops;
> host->map_irq = tegra_pcie_map_irq;
> - host->swizzle_irq = pci_common_swizzle;
>
> err = pci_host_probe(host);
> if (err < 0) {
> diff --git a/drivers/pci/controller/pcie-iproc-platform.c b/drivers/pci/controller/pcie-iproc-platform.c
> index 7c10c1cb6f65..a956b0c18bd1 100644
> --- a/drivers/pci/controller/pcie-iproc-platform.c
> +++ b/drivers/pci/controller/pcie-iproc-platform.c
> @@ -99,9 +99,10 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
> switch (pcie->type) {
> case IPROC_PCIE_PAXC:
> case IPROC_PCIE_PAXC_V2:
> + pcie->map_irq = 0;
> break;
> default:
> - pcie->map_irq = of_irq_parse_and_map_pci;
> + break;
> }
>
> ret = iproc_pcie_setup(pcie, &bridge->windows);
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index e98dafd0fff4..905e93808243 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -1526,7 +1526,6 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
> host->ops = &iproc_pcie_ops;
> host->sysdata = pcie;
> host->map_irq = pcie->map_irq;
> - host->swizzle_irq = pci_common_swizzle;
>
> ret = pci_host_probe(host);
> if (ret < 0) {
drivers/pci/controller/pci-loongson.c:
static int loongson_pci_probe(struct platform_device *pdev)
{
...
bridge->map_irq = loongson_map_irq;
next prev parent reply other threads:[~2022-01-11 21:46 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 2:24 [PATCH 00/19] PCI: Another round of host clean-ups Rob Herring
2020-07-22 2:24 ` [PATCH 01/19] PCI: versatile: Drop flag PCI_ENABLE_PROC_DOMAINS Rob Herring
2020-07-22 2:24 ` [PATCH 02/19] PCI: Set default bridge parent device Rob Herring
2020-07-22 2:24 ` [PATCH 03/19] PCI: Drop unnecessary zeroing of bridge fields Rob Herring
2020-07-22 2:24 ` [PATCH 04/19] PCI: aardvark: Use pci_is_root_bus() to check if bus is root bus Rob Herring
2020-07-22 2:25 ` [PATCH 05/19] PCI: designware: " Rob Herring
2020-07-22 2:25 ` [PATCH 06/19] PCI: mobiveil: " Rob Herring
2020-07-22 2:25 ` [PATCH 07/19] PCI: xilinx-nwl: " Rob Herring
2020-07-22 2:25 ` [PATCH 08/19] PCI: xilinx: " Rob Herring
2020-07-22 2:25 ` [PATCH 09/19] PCI: rockchip: " Rob Herring
2020-07-22 2:25 ` [PATCH 10/19] PCI: rcar: " Rob Herring
2020-07-22 2:25 ` [PATCH 11/19] PCI: Move setting pci_host_bridge.busnr out of host drivers Rob Herring
2020-07-23 15:26 ` Rob Herring
2020-07-23 16:21 ` Lorenzo Pieralisi
2020-07-23 16:55 ` Rob Herring
2020-07-22 2:25 ` [PATCH 12/19] PCI: cadence: Use bridge resources for outbound window setup Rob Herring
2020-07-22 2:25 ` [PATCH 13/19] PCI: cadence: Remove private bus number and range storage Rob Herring
2020-07-22 2:25 ` [PATCH 14/19] PCI: rcar: Use devm_pci_alloc_host_bridge() Rob Herring
2020-07-22 2:25 ` [PATCH 15/19] PCI: rcar: Use struct pci_host_bridge.windows list directly Rob Herring
2020-07-22 2:25 ` [PATCH 16/19] PCI: of: Reduce missing non-prefetchable memory region to a warning Rob Herring
2020-07-22 2:25 ` [PATCH 17/19] PCI: rcar-gen2: Convert to use modern host bridge probe functions Rob Herring
2020-08-04 12:12 ` Geert Uytterhoeven
2020-08-04 15:13 ` Rob Herring
2020-07-22 2:25 ` [PATCH 18/19] PCI: Move DT resource setup into devm_pci_alloc_host_bridge() Rob Herring
2020-07-22 2:25 ` [PATCH 19/19] PCI: Set bridge map_irq and swizzle_irq to default functions Rob Herring
2022-01-11 21:46 ` Bjorn Helgaas [this message]
2022-01-12 12:57 ` Jiaxun Yang
2022-01-12 15:19 ` Bjorn Helgaas
2022-01-12 20:08 ` Jiaxun Yang
2022-01-12 21:10 ` Bjorn Helgaas
2022-01-13 17:44 ` Jiaxun Yang
2022-01-12 15:09 ` Rob Herring
2022-01-12 15:32 ` Bjorn Helgaas
2022-01-29 22:34 ` Maciej W. Rozycki
2020-07-22 21:06 ` [PATCH 00/19] PCI: Another round of host clean-ups Bjorn Helgaas
2020-07-23 10:39 ` Lorenzo Pieralisi
2020-07-23 23:01 ` Bjorn Helgaas
2020-07-24 15:55 ` Rob Herring
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