Re: [PATCH V3] PCI: tegra: Fix building Tegra194 PCIe driver

[Jon Hunter <jonathanh@nvidia.com>]

Hi Bjorn, Lorenzo,

On 26/05/2021 13:33, Jon Hunter wrote:
> Commit 7f100744749e ("PCI: tegra: Add Tegra194 MCFG quirks for ECAM
> errata") caused a few build regressions for the Tegra194 PCIe driver
> which are:
> 
> 1. The Tegra194 PCIe driver can no longer be built as a module. This
>    was caused by removing the Makefile entry to build the pcie-tegra.c
>    based upon the CONFIG_PCIE_TEGRA194 option. Therefore, restore this
>    so that we can build the driver as a module.
> 2. 7f100744749e ("PCI: tegra: Add Tegra194 MCFG quirks for ECAM
>    errata") added "#ifdef CONFIG_PCIE_TEGRA194" around the native
>    driver. But if we set CONFIG_PCIE_TEGRA194=m to build the driver as a
>    module, autoconf.h contains "#define CONFIG_PCIE_TEGRA194_MODULE 1"
>    (not "#define CONFIG_PCIE_TEGRA194 1"), so the #ifdef excludes the
>    driver. Instead, use "IS_ENABLED(CONFIG_PCIE_TEGRA194)", which checks
>    for either CONFIG_PCIE_TEGRA194 or CONFIG_PCIE_TEGRA194_MODULE.
> 3. The below build warnings that are seen with particular kernel
>    configurations. Fix these by moving these structure definitions to
>    within the necessary guards.
> 
>   drivers/pci/controller/dwc/pcie-tegra194.c:259:18: warning:
>   	‘event_cntr_data_offset’ defined but not used [-Wunused-const-variable=]
>   drivers/pci/controller/dwc/pcie-tegra194.c:250:18: warning:
>   	‘event_cntr_ctrl_offset’ defined but not used [-Wunused-const-variable=]
>   drivers/pci/controller/dwc/pcie-tegra194.c:243:27: warning:
>   	‘pcie_gen_freq’ defined but not used [-Wunused-const-variable=]
> 
> Fixes: 7f100744749e ("PCI: tegra: Add Tegra194 MCFG quirks for ECAM errata")
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>


Any feedback on this? We need this for v5.13.

Thanks!
Jon

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